1 //===---- CGOpenMPRuntimeGPU.cpp - Interface to OpenMP GPU Runtimes ----===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This provides a generalized class for OpenMP runtime code generation 10 // specialized by GPU targets NVPTX and AMDGCN. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "CGOpenMPRuntimeGPU.h" 15 #include "CGOpenMPRuntimeNVPTX.h" 16 #include "CodeGenFunction.h" 17 #include "clang/AST/Attr.h" 18 #include "clang/AST/DeclOpenMP.h" 19 #include "clang/AST/StmtOpenMP.h" 20 #include "clang/AST/StmtVisitor.h" 21 #include "clang/Basic/Cuda.h" 22 #include "llvm/ADT/SmallPtrSet.h" 23 #include "llvm/Frontend/OpenMP/OMPGridValues.h" 24 #include "llvm/IR/IntrinsicsNVPTX.h" 25 26 using namespace clang; 27 using namespace CodeGen; 28 using namespace llvm::omp; 29 30 namespace { 31 enum OpenMPRTLFunctionNVPTX { 32 /// Call to void __kmpc_kernel_init(kmp_int32 thread_limit, 33 /// int16_t RequiresOMPRuntime); 34 OMPRTL_NVPTX__kmpc_kernel_init, 35 /// Call to void __kmpc_kernel_deinit(int16_t IsOMPRuntimeInitialized); 36 OMPRTL_NVPTX__kmpc_kernel_deinit, 37 /// Call to void __kmpc_spmd_kernel_init(kmp_int32 thread_limit, 38 /// int16_t RequiresOMPRuntime, int16_t RequiresDataSharing); 39 OMPRTL_NVPTX__kmpc_spmd_kernel_init, 40 /// Call to void __kmpc_spmd_kernel_deinit_v2(int16_t RequiresOMPRuntime); 41 OMPRTL_NVPTX__kmpc_spmd_kernel_deinit_v2, 42 /// Call to void __kmpc_kernel_prepare_parallel(void 43 /// *outlined_function); 44 OMPRTL_NVPTX__kmpc_kernel_prepare_parallel, 45 /// Call to bool __kmpc_kernel_parallel(void **outlined_function); 46 OMPRTL_NVPTX__kmpc_kernel_parallel, 47 /// Call to void __kmpc_kernel_end_parallel(); 48 OMPRTL_NVPTX__kmpc_kernel_end_parallel, 49 /// Call to void __kmpc_serialized_parallel(ident_t *loc, kmp_int32 50 /// global_tid); 51 OMPRTL_NVPTX__kmpc_serialized_parallel, 52 /// Call to void __kmpc_end_serialized_parallel(ident_t *loc, kmp_int32 53 /// global_tid); 54 OMPRTL_NVPTX__kmpc_end_serialized_parallel, 55 /// Call to int32_t __kmpc_shuffle_int32(int32_t element, 56 /// int16_t lane_offset, int16_t warp_size); 57 OMPRTL_NVPTX__kmpc_shuffle_int32, 58 /// Call to int64_t __kmpc_shuffle_int64(int64_t element, 59 /// int16_t lane_offset, int16_t warp_size); 60 OMPRTL_NVPTX__kmpc_shuffle_int64, 61 /// Call to __kmpc_nvptx_parallel_reduce_nowait_v2(ident_t *loc, kmp_int32 62 /// global_tid, kmp_int32 num_vars, size_t reduce_size, void* reduce_data, 63 /// void (*kmp_ShuffleReductFctPtr)(void *rhsData, int16_t lane_id, int16_t 64 /// lane_offset, int16_t shortCircuit), 65 /// void (*kmp_InterWarpCopyFctPtr)(void* src, int32_t warp_num)); 66 OMPRTL_NVPTX__kmpc_nvptx_parallel_reduce_nowait_v2, 67 /// Call to __kmpc_nvptx_teams_reduce_nowait_v2(ident_t *loc, kmp_int32 68 /// global_tid, void *global_buffer, int32_t num_of_records, void* 69 /// reduce_data, 70 /// void (*kmp_ShuffleReductFctPtr)(void *rhsData, int16_t lane_id, int16_t 71 /// lane_offset, int16_t shortCircuit), 72 /// void (*kmp_InterWarpCopyFctPtr)(void* src, int32_t warp_num), void 73 /// (*kmp_ListToGlobalCpyFctPtr)(void *buffer, int idx, void *reduce_data), 74 /// void (*kmp_GlobalToListCpyFctPtr)(void *buffer, int idx, 75 /// void *reduce_data), void (*kmp_GlobalToListCpyPtrsFctPtr)(void *buffer, 76 /// int idx, void *reduce_data), void (*kmp_GlobalToListRedFctPtr)(void 77 /// *buffer, int idx, void *reduce_data)); 78 OMPRTL_NVPTX__kmpc_nvptx_teams_reduce_nowait_v2, 79 /// Call to __kmpc_nvptx_end_reduce_nowait(int32_t global_tid); 80 OMPRTL_NVPTX__kmpc_end_reduce_nowait, 81 /// Call to void __kmpc_data_sharing_init_stack(); 82 OMPRTL_NVPTX__kmpc_data_sharing_init_stack, 83 /// Call to void __kmpc_data_sharing_init_stack_spmd(); 84 OMPRTL_NVPTX__kmpc_data_sharing_init_stack_spmd, 85 /// Call to void* __kmpc_data_sharing_coalesced_push_stack(size_t size, 86 /// int16_t UseSharedMemory); 87 OMPRTL_NVPTX__kmpc_data_sharing_coalesced_push_stack, 88 /// Call to void* __kmpc_data_sharing_push_stack(size_t size, int16_t 89 /// UseSharedMemory); 90 OMPRTL_NVPTX__kmpc_data_sharing_push_stack, 91 /// Call to void __kmpc_data_sharing_pop_stack(void *a); 92 OMPRTL_NVPTX__kmpc_data_sharing_pop_stack, 93 /// Call to void __kmpc_begin_sharing_variables(void ***args, 94 /// size_t n_args); 95 OMPRTL_NVPTX__kmpc_begin_sharing_variables, 96 /// Call to void __kmpc_end_sharing_variables(); 97 OMPRTL_NVPTX__kmpc_end_sharing_variables, 98 /// Call to void __kmpc_get_shared_variables(void ***GlobalArgs) 99 OMPRTL_NVPTX__kmpc_get_shared_variables, 100 /// Call to uint16_t __kmpc_parallel_level(ident_t *loc, kmp_int32 101 /// global_tid); 102 OMPRTL_NVPTX__kmpc_parallel_level, 103 /// Call to int8_t __kmpc_is_spmd_exec_mode(); 104 OMPRTL_NVPTX__kmpc_is_spmd_exec_mode, 105 /// Call to void __kmpc_get_team_static_memory(int16_t isSPMDExecutionMode, 106 /// const void *buf, size_t size, int16_t is_shared, const void **res); 107 OMPRTL_NVPTX__kmpc_get_team_static_memory, 108 /// Call to void __kmpc_restore_team_static_memory(int16_t 109 /// isSPMDExecutionMode, int16_t is_shared); 110 OMPRTL_NVPTX__kmpc_restore_team_static_memory, 111 /// Call to void __kmpc_barrier(ident_t *loc, kmp_int32 global_tid); 112 OMPRTL__kmpc_barrier, 113 /// Call to void __kmpc_barrier_simple_spmd(ident_t *loc, kmp_int32 114 /// global_tid); 115 OMPRTL__kmpc_barrier_simple_spmd, 116 /// Call to int32_t __kmpc_warp_active_thread_mask(void); 117 OMPRTL_NVPTX__kmpc_warp_active_thread_mask, 118 /// Call to void __kmpc_syncwarp(int32_t Mask); 119 OMPRTL_NVPTX__kmpc_syncwarp, 120 }; 121 122 /// Pre(post)-action for different OpenMP constructs specialized for NVPTX. 123 class NVPTXActionTy final : public PrePostActionTy { 124 llvm::FunctionCallee EnterCallee = nullptr; 125 ArrayRef<llvm::Value *> EnterArgs; 126 llvm::FunctionCallee ExitCallee = nullptr; 127 ArrayRef<llvm::Value *> ExitArgs; 128 bool Conditional = false; 129 llvm::BasicBlock *ContBlock = nullptr; 130 131 public: 132 NVPTXActionTy(llvm::FunctionCallee EnterCallee, 133 ArrayRef<llvm::Value *> EnterArgs, 134 llvm::FunctionCallee ExitCallee, 135 ArrayRef<llvm::Value *> ExitArgs, bool Conditional = false) 136 : EnterCallee(EnterCallee), EnterArgs(EnterArgs), ExitCallee(ExitCallee), 137 ExitArgs(ExitArgs), Conditional(Conditional) {} 138 void Enter(CodeGenFunction &CGF) override { 139 llvm::Value *EnterRes = CGF.EmitRuntimeCall(EnterCallee, EnterArgs); 140 if (Conditional) { 141 llvm::Value *CallBool = CGF.Builder.CreateIsNotNull(EnterRes); 142 auto *ThenBlock = CGF.createBasicBlock("omp_if.then"); 143 ContBlock = CGF.createBasicBlock("omp_if.end"); 144 // Generate the branch (If-stmt) 145 CGF.Builder.CreateCondBr(CallBool, ThenBlock, ContBlock); 146 CGF.EmitBlock(ThenBlock); 147 } 148 } 149 void Done(CodeGenFunction &CGF) { 150 // Emit the rest of blocks/branches 151 CGF.EmitBranch(ContBlock); 152 CGF.EmitBlock(ContBlock, true); 153 } 154 void Exit(CodeGenFunction &CGF) override { 155 CGF.EmitRuntimeCall(ExitCallee, ExitArgs); 156 } 157 }; 158 159 /// A class to track the execution mode when codegening directives within 160 /// a target region. The appropriate mode (SPMD|NON-SPMD) is set on entry 161 /// to the target region and used by containing directives such as 'parallel' 162 /// to emit optimized code. 163 class ExecutionRuntimeModesRAII { 164 private: 165 CGOpenMPRuntimeGPU::ExecutionMode SavedExecMode = 166 CGOpenMPRuntimeGPU::EM_Unknown; 167 CGOpenMPRuntimeGPU::ExecutionMode &ExecMode; 168 bool SavedRuntimeMode = false; 169 bool *RuntimeMode = nullptr; 170 171 public: 172 /// Constructor for Non-SPMD mode. 173 ExecutionRuntimeModesRAII(CGOpenMPRuntimeGPU::ExecutionMode &ExecMode) 174 : ExecMode(ExecMode) { 175 SavedExecMode = ExecMode; 176 ExecMode = CGOpenMPRuntimeGPU::EM_NonSPMD; 177 } 178 /// Constructor for SPMD mode. 179 ExecutionRuntimeModesRAII(CGOpenMPRuntimeGPU::ExecutionMode &ExecMode, 180 bool &RuntimeMode, bool FullRuntimeMode) 181 : ExecMode(ExecMode), RuntimeMode(&RuntimeMode) { 182 SavedExecMode = ExecMode; 183 SavedRuntimeMode = RuntimeMode; 184 ExecMode = CGOpenMPRuntimeGPU::EM_SPMD; 185 RuntimeMode = FullRuntimeMode; 186 } 187 ~ExecutionRuntimeModesRAII() { 188 ExecMode = SavedExecMode; 189 if (RuntimeMode) 190 *RuntimeMode = SavedRuntimeMode; 191 } 192 }; 193 194 /// GPU Configuration: This information can be derived from cuda registers, 195 /// however, providing compile time constants helps generate more efficient 196 /// code. For all practical purposes this is fine because the configuration 197 /// is the same for all known NVPTX architectures. 198 enum MachineConfiguration : unsigned { 199 /// See "llvm/Frontend/OpenMP/OMPGridValues.h" for various related target 200 /// specific Grid Values like GV_Warp_Size, GV_Warp_Size_Log2, 201 /// and GV_Warp_Size_Log2_Mask. 202 203 /// Global memory alignment for performance. 204 GlobalMemoryAlignment = 128, 205 206 /// Maximal size of the shared memory buffer. 207 SharedMemorySize = 128, 208 }; 209 210 static const ValueDecl *getPrivateItem(const Expr *RefExpr) { 211 RefExpr = RefExpr->IgnoreParens(); 212 if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(RefExpr)) { 213 const Expr *Base = ASE->getBase()->IgnoreParenImpCasts(); 214 while (const auto *TempASE = dyn_cast<ArraySubscriptExpr>(Base)) 215 Base = TempASE->getBase()->IgnoreParenImpCasts(); 216 RefExpr = Base; 217 } else if (auto *OASE = dyn_cast<OMPArraySectionExpr>(RefExpr)) { 218 const Expr *Base = OASE->getBase()->IgnoreParenImpCasts(); 219 while (const auto *TempOASE = dyn_cast<OMPArraySectionExpr>(Base)) 220 Base = TempOASE->getBase()->IgnoreParenImpCasts(); 221 while (const auto *TempASE = dyn_cast<ArraySubscriptExpr>(Base)) 222 Base = TempASE->getBase()->IgnoreParenImpCasts(); 223 RefExpr = Base; 224 } 225 RefExpr = RefExpr->IgnoreParenImpCasts(); 226 if (const auto *DE = dyn_cast<DeclRefExpr>(RefExpr)) 227 return cast<ValueDecl>(DE->getDecl()->getCanonicalDecl()); 228 const auto *ME = cast<MemberExpr>(RefExpr); 229 return cast<ValueDecl>(ME->getMemberDecl()->getCanonicalDecl()); 230 } 231 232 233 static RecordDecl *buildRecordForGlobalizedVars( 234 ASTContext &C, ArrayRef<const ValueDecl *> EscapedDecls, 235 ArrayRef<const ValueDecl *> EscapedDeclsForTeams, 236 llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> 237 &MappedDeclsFields, int BufSize) { 238 using VarsDataTy = std::pair<CharUnits /*Align*/, const ValueDecl *>; 239 if (EscapedDecls.empty() && EscapedDeclsForTeams.empty()) 240 return nullptr; 241 SmallVector<VarsDataTy, 4> GlobalizedVars; 242 for (const ValueDecl *D : EscapedDecls) 243 GlobalizedVars.emplace_back( 244 CharUnits::fromQuantity(std::max( 245 C.getDeclAlign(D).getQuantity(), 246 static_cast<CharUnits::QuantityType>(GlobalMemoryAlignment))), 247 D); 248 for (const ValueDecl *D : EscapedDeclsForTeams) 249 GlobalizedVars.emplace_back(C.getDeclAlign(D), D); 250 llvm::stable_sort(GlobalizedVars, [](VarsDataTy L, VarsDataTy R) { 251 return L.first > R.first; 252 }); 253 254 // Build struct _globalized_locals_ty { 255 // /* globalized vars */[WarSize] align (max(decl_align, 256 // GlobalMemoryAlignment)) 257 // /* globalized vars */ for EscapedDeclsForTeams 258 // }; 259 RecordDecl *GlobalizedRD = C.buildImplicitRecord("_globalized_locals_ty"); 260 GlobalizedRD->startDefinition(); 261 llvm::SmallPtrSet<const ValueDecl *, 16> SingleEscaped( 262 EscapedDeclsForTeams.begin(), EscapedDeclsForTeams.end()); 263 for (const auto &Pair : GlobalizedVars) { 264 const ValueDecl *VD = Pair.second; 265 QualType Type = VD->getType(); 266 if (Type->isLValueReferenceType()) 267 Type = C.getPointerType(Type.getNonReferenceType()); 268 else 269 Type = Type.getNonReferenceType(); 270 SourceLocation Loc = VD->getLocation(); 271 FieldDecl *Field; 272 if (SingleEscaped.count(VD)) { 273 Field = FieldDecl::Create( 274 C, GlobalizedRD, Loc, Loc, VD->getIdentifier(), Type, 275 C.getTrivialTypeSourceInfo(Type, SourceLocation()), 276 /*BW=*/nullptr, /*Mutable=*/false, 277 /*InitStyle=*/ICIS_NoInit); 278 Field->setAccess(AS_public); 279 if (VD->hasAttrs()) { 280 for (specific_attr_iterator<AlignedAttr> I(VD->getAttrs().begin()), 281 E(VD->getAttrs().end()); 282 I != E; ++I) 283 Field->addAttr(*I); 284 } 285 } else { 286 llvm::APInt ArraySize(32, BufSize); 287 Type = C.getConstantArrayType(Type, ArraySize, nullptr, ArrayType::Normal, 288 0); 289 Field = FieldDecl::Create( 290 C, GlobalizedRD, Loc, Loc, VD->getIdentifier(), Type, 291 C.getTrivialTypeSourceInfo(Type, SourceLocation()), 292 /*BW=*/nullptr, /*Mutable=*/false, 293 /*InitStyle=*/ICIS_NoInit); 294 Field->setAccess(AS_public); 295 llvm::APInt Align(32, std::max(C.getDeclAlign(VD).getQuantity(), 296 static_cast<CharUnits::QuantityType>( 297 GlobalMemoryAlignment))); 298 Field->addAttr(AlignedAttr::CreateImplicit( 299 C, /*IsAlignmentExpr=*/true, 300 IntegerLiteral::Create(C, Align, 301 C.getIntTypeForBitwidth(32, /*Signed=*/0), 302 SourceLocation()), 303 {}, AttributeCommonInfo::AS_GNU, AlignedAttr::GNU_aligned)); 304 } 305 GlobalizedRD->addDecl(Field); 306 MappedDeclsFields.try_emplace(VD, Field); 307 } 308 GlobalizedRD->completeDefinition(); 309 return GlobalizedRD; 310 } 311 312 /// Get the list of variables that can escape their declaration context. 313 class CheckVarsEscapingDeclContext final 314 : public ConstStmtVisitor<CheckVarsEscapingDeclContext> { 315 CodeGenFunction &CGF; 316 llvm::SetVector<const ValueDecl *> EscapedDecls; 317 llvm::SetVector<const ValueDecl *> EscapedVariableLengthDecls; 318 llvm::SmallPtrSet<const Decl *, 4> EscapedParameters; 319 RecordDecl *GlobalizedRD = nullptr; 320 llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> MappedDeclsFields; 321 bool AllEscaped = false; 322 bool IsForCombinedParallelRegion = false; 323 324 void markAsEscaped(const ValueDecl *VD) { 325 // Do not globalize declare target variables. 326 if (!isa<VarDecl>(VD) || 327 OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD)) 328 return; 329 VD = cast<ValueDecl>(VD->getCanonicalDecl()); 330 // Use user-specified allocation. 331 if (VD->hasAttrs() && VD->hasAttr<OMPAllocateDeclAttr>()) 332 return; 333 // Variables captured by value must be globalized. 334 if (auto *CSI = CGF.CapturedStmtInfo) { 335 if (const FieldDecl *FD = CSI->lookup(cast<VarDecl>(VD))) { 336 // Check if need to capture the variable that was already captured by 337 // value in the outer region. 338 if (!IsForCombinedParallelRegion) { 339 if (!FD->hasAttrs()) 340 return; 341 const auto *Attr = FD->getAttr<OMPCaptureKindAttr>(); 342 if (!Attr) 343 return; 344 if (((Attr->getCaptureKind() != OMPC_map) && 345 !isOpenMPPrivate(Attr->getCaptureKind())) || 346 ((Attr->getCaptureKind() == OMPC_map) && 347 !FD->getType()->isAnyPointerType())) 348 return; 349 } 350 if (!FD->getType()->isReferenceType()) { 351 assert(!VD->getType()->isVariablyModifiedType() && 352 "Parameter captured by value with variably modified type"); 353 EscapedParameters.insert(VD); 354 } else if (!IsForCombinedParallelRegion) { 355 return; 356 } 357 } 358 } 359 if ((!CGF.CapturedStmtInfo || 360 (IsForCombinedParallelRegion && CGF.CapturedStmtInfo)) && 361 VD->getType()->isReferenceType()) 362 // Do not globalize variables with reference type. 363 return; 364 if (VD->getType()->isVariablyModifiedType()) 365 EscapedVariableLengthDecls.insert(VD); 366 else 367 EscapedDecls.insert(VD); 368 } 369 370 void VisitValueDecl(const ValueDecl *VD) { 371 if (VD->getType()->isLValueReferenceType()) 372 markAsEscaped(VD); 373 if (const auto *VarD = dyn_cast<VarDecl>(VD)) { 374 if (!isa<ParmVarDecl>(VarD) && VarD->hasInit()) { 375 const bool SavedAllEscaped = AllEscaped; 376 AllEscaped = VD->getType()->isLValueReferenceType(); 377 Visit(VarD->getInit()); 378 AllEscaped = SavedAllEscaped; 379 } 380 } 381 } 382 void VisitOpenMPCapturedStmt(const CapturedStmt *S, 383 ArrayRef<OMPClause *> Clauses, 384 bool IsCombinedParallelRegion) { 385 if (!S) 386 return; 387 for (const CapturedStmt::Capture &C : S->captures()) { 388 if (C.capturesVariable() && !C.capturesVariableByCopy()) { 389 const ValueDecl *VD = C.getCapturedVar(); 390 bool SavedIsForCombinedParallelRegion = IsForCombinedParallelRegion; 391 if (IsCombinedParallelRegion) { 392 // Check if the variable is privatized in the combined construct and 393 // those private copies must be shared in the inner parallel 394 // directive. 395 IsForCombinedParallelRegion = false; 396 for (const OMPClause *C : Clauses) { 397 if (!isOpenMPPrivate(C->getClauseKind()) || 398 C->getClauseKind() == OMPC_reduction || 399 C->getClauseKind() == OMPC_linear || 400 C->getClauseKind() == OMPC_private) 401 continue; 402 ArrayRef<const Expr *> Vars; 403 if (const auto *PC = dyn_cast<OMPFirstprivateClause>(C)) 404 Vars = PC->getVarRefs(); 405 else if (const auto *PC = dyn_cast<OMPLastprivateClause>(C)) 406 Vars = PC->getVarRefs(); 407 else 408 llvm_unreachable("Unexpected clause."); 409 for (const auto *E : Vars) { 410 const Decl *D = 411 cast<DeclRefExpr>(E)->getDecl()->getCanonicalDecl(); 412 if (D == VD->getCanonicalDecl()) { 413 IsForCombinedParallelRegion = true; 414 break; 415 } 416 } 417 if (IsForCombinedParallelRegion) 418 break; 419 } 420 } 421 markAsEscaped(VD); 422 if (isa<OMPCapturedExprDecl>(VD)) 423 VisitValueDecl(VD); 424 IsForCombinedParallelRegion = SavedIsForCombinedParallelRegion; 425 } 426 } 427 } 428 429 void buildRecordForGlobalizedVars(bool IsInTTDRegion) { 430 assert(!GlobalizedRD && 431 "Record for globalized variables is built already."); 432 ArrayRef<const ValueDecl *> EscapedDeclsForParallel, EscapedDeclsForTeams; 433 unsigned WarpSize = CGF.getTarget().getGridValue(llvm::omp::GV_Warp_Size); 434 if (IsInTTDRegion) 435 EscapedDeclsForTeams = EscapedDecls.getArrayRef(); 436 else 437 EscapedDeclsForParallel = EscapedDecls.getArrayRef(); 438 GlobalizedRD = ::buildRecordForGlobalizedVars( 439 CGF.getContext(), EscapedDeclsForParallel, EscapedDeclsForTeams, 440 MappedDeclsFields, WarpSize); 441 } 442 443 public: 444 CheckVarsEscapingDeclContext(CodeGenFunction &CGF, 445 ArrayRef<const ValueDecl *> TeamsReductions) 446 : CGF(CGF), EscapedDecls(TeamsReductions.begin(), TeamsReductions.end()) { 447 } 448 virtual ~CheckVarsEscapingDeclContext() = default; 449 void VisitDeclStmt(const DeclStmt *S) { 450 if (!S) 451 return; 452 for (const Decl *D : S->decls()) 453 if (const auto *VD = dyn_cast_or_null<ValueDecl>(D)) 454 VisitValueDecl(VD); 455 } 456 void VisitOMPExecutableDirective(const OMPExecutableDirective *D) { 457 if (!D) 458 return; 459 if (!D->hasAssociatedStmt()) 460 return; 461 if (const auto *S = 462 dyn_cast_or_null<CapturedStmt>(D->getAssociatedStmt())) { 463 // Do not analyze directives that do not actually require capturing, 464 // like `omp for` or `omp simd` directives. 465 llvm::SmallVector<OpenMPDirectiveKind, 4> CaptureRegions; 466 getOpenMPCaptureRegions(CaptureRegions, D->getDirectiveKind()); 467 if (CaptureRegions.size() == 1 && CaptureRegions.back() == OMPD_unknown) { 468 VisitStmt(S->getCapturedStmt()); 469 return; 470 } 471 VisitOpenMPCapturedStmt( 472 S, D->clauses(), 473 CaptureRegions.back() == OMPD_parallel && 474 isOpenMPDistributeDirective(D->getDirectiveKind())); 475 } 476 } 477 void VisitCapturedStmt(const CapturedStmt *S) { 478 if (!S) 479 return; 480 for (const CapturedStmt::Capture &C : S->captures()) { 481 if (C.capturesVariable() && !C.capturesVariableByCopy()) { 482 const ValueDecl *VD = C.getCapturedVar(); 483 markAsEscaped(VD); 484 if (isa<OMPCapturedExprDecl>(VD)) 485 VisitValueDecl(VD); 486 } 487 } 488 } 489 void VisitLambdaExpr(const LambdaExpr *E) { 490 if (!E) 491 return; 492 for (const LambdaCapture &C : E->captures()) { 493 if (C.capturesVariable()) { 494 if (C.getCaptureKind() == LCK_ByRef) { 495 const ValueDecl *VD = C.getCapturedVar(); 496 markAsEscaped(VD); 497 if (E->isInitCapture(&C) || isa<OMPCapturedExprDecl>(VD)) 498 VisitValueDecl(VD); 499 } 500 } 501 } 502 } 503 void VisitBlockExpr(const BlockExpr *E) { 504 if (!E) 505 return; 506 for (const BlockDecl::Capture &C : E->getBlockDecl()->captures()) { 507 if (C.isByRef()) { 508 const VarDecl *VD = C.getVariable(); 509 markAsEscaped(VD); 510 if (isa<OMPCapturedExprDecl>(VD) || VD->isInitCapture()) 511 VisitValueDecl(VD); 512 } 513 } 514 } 515 void VisitCallExpr(const CallExpr *E) { 516 if (!E) 517 return; 518 for (const Expr *Arg : E->arguments()) { 519 if (!Arg) 520 continue; 521 if (Arg->isLValue()) { 522 const bool SavedAllEscaped = AllEscaped; 523 AllEscaped = true; 524 Visit(Arg); 525 AllEscaped = SavedAllEscaped; 526 } else { 527 Visit(Arg); 528 } 529 } 530 Visit(E->getCallee()); 531 } 532 void VisitDeclRefExpr(const DeclRefExpr *E) { 533 if (!E) 534 return; 535 const ValueDecl *VD = E->getDecl(); 536 if (AllEscaped) 537 markAsEscaped(VD); 538 if (isa<OMPCapturedExprDecl>(VD)) 539 VisitValueDecl(VD); 540 else if (const auto *VarD = dyn_cast<VarDecl>(VD)) 541 if (VarD->isInitCapture()) 542 VisitValueDecl(VD); 543 } 544 void VisitUnaryOperator(const UnaryOperator *E) { 545 if (!E) 546 return; 547 if (E->getOpcode() == UO_AddrOf) { 548 const bool SavedAllEscaped = AllEscaped; 549 AllEscaped = true; 550 Visit(E->getSubExpr()); 551 AllEscaped = SavedAllEscaped; 552 } else { 553 Visit(E->getSubExpr()); 554 } 555 } 556 void VisitImplicitCastExpr(const ImplicitCastExpr *E) { 557 if (!E) 558 return; 559 if (E->getCastKind() == CK_ArrayToPointerDecay) { 560 const bool SavedAllEscaped = AllEscaped; 561 AllEscaped = true; 562 Visit(E->getSubExpr()); 563 AllEscaped = SavedAllEscaped; 564 } else { 565 Visit(E->getSubExpr()); 566 } 567 } 568 void VisitExpr(const Expr *E) { 569 if (!E) 570 return; 571 bool SavedAllEscaped = AllEscaped; 572 if (!E->isLValue()) 573 AllEscaped = false; 574 for (const Stmt *Child : E->children()) 575 if (Child) 576 Visit(Child); 577 AllEscaped = SavedAllEscaped; 578 } 579 void VisitStmt(const Stmt *S) { 580 if (!S) 581 return; 582 for (const Stmt *Child : S->children()) 583 if (Child) 584 Visit(Child); 585 } 586 587 /// Returns the record that handles all the escaped local variables and used 588 /// instead of their original storage. 589 const RecordDecl *getGlobalizedRecord(bool IsInTTDRegion) { 590 if (!GlobalizedRD) 591 buildRecordForGlobalizedVars(IsInTTDRegion); 592 return GlobalizedRD; 593 } 594 595 /// Returns the field in the globalized record for the escaped variable. 596 const FieldDecl *getFieldForGlobalizedVar(const ValueDecl *VD) const { 597 assert(GlobalizedRD && 598 "Record for globalized variables must be generated already."); 599 auto I = MappedDeclsFields.find(VD); 600 if (I == MappedDeclsFields.end()) 601 return nullptr; 602 return I->getSecond(); 603 } 604 605 /// Returns the list of the escaped local variables/parameters. 606 ArrayRef<const ValueDecl *> getEscapedDecls() const { 607 return EscapedDecls.getArrayRef(); 608 } 609 610 /// Checks if the escaped local variable is actually a parameter passed by 611 /// value. 612 const llvm::SmallPtrSetImpl<const Decl *> &getEscapedParameters() const { 613 return EscapedParameters; 614 } 615 616 /// Returns the list of the escaped variables with the variably modified 617 /// types. 618 ArrayRef<const ValueDecl *> getEscapedVariableLengthDecls() const { 619 return EscapedVariableLengthDecls.getArrayRef(); 620 } 621 }; 622 } // anonymous namespace 623 624 /// Get the id of the warp in the block. 625 /// We assume that the warp size is 32, which is always the case 626 /// on the NVPTX device, to generate more efficient code. 627 static llvm::Value *getNVPTXWarpID(CodeGenFunction &CGF) { 628 CGBuilderTy &Bld = CGF.Builder; 629 unsigned LaneIDBits = 630 CGF.getTarget().getGridValue(llvm::omp::GV_Warp_Size_Log2); 631 auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); 632 return Bld.CreateAShr(RT.getGPUThreadID(CGF), LaneIDBits, "nvptx_warp_id"); 633 } 634 635 /// Get the id of the current lane in the Warp. 636 /// We assume that the warp size is 32, which is always the case 637 /// on the NVPTX device, to generate more efficient code. 638 static llvm::Value *getNVPTXLaneID(CodeGenFunction &CGF) { 639 CGBuilderTy &Bld = CGF.Builder; 640 unsigned LaneIDMask = CGF.getContext().getTargetInfo().getGridValue( 641 llvm::omp::GV_Warp_Size_Log2_Mask); 642 auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); 643 return Bld.CreateAnd(RT.getGPUThreadID(CGF), Bld.getInt32(LaneIDMask), 644 "nvptx_lane_id"); 645 } 646 647 /// Get the value of the thread_limit clause in the teams directive. 648 /// For the 'generic' execution mode, the runtime encodes thread_limit in 649 /// the launch parameters, always starting thread_limit+warpSize threads per 650 /// CTA. The threads in the last warp are reserved for master execution. 651 /// For the 'spmd' execution mode, all threads in a CTA are part of the team. 652 static llvm::Value *getThreadLimit(CodeGenFunction &CGF, 653 bool IsInSPMDExecutionMode = false) { 654 CGBuilderTy &Bld = CGF.Builder; 655 auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); 656 return IsInSPMDExecutionMode 657 ? RT.getGPUNumThreads(CGF) 658 : Bld.CreateNUWSub(RT.getGPUNumThreads(CGF), 659 RT.getGPUWarpSize(CGF), "thread_limit"); 660 } 661 662 /// Get the thread id of the OMP master thread. 663 /// The master thread id is the first thread (lane) of the last warp in the 664 /// GPU block. Warp size is assumed to be some power of 2. 665 /// Thread id is 0 indexed. 666 /// E.g: If NumThreads is 33, master id is 32. 667 /// If NumThreads is 64, master id is 32. 668 /// If NumThreads is 1024, master id is 992. 669 static llvm::Value *getMasterThreadID(CodeGenFunction &CGF) { 670 CGBuilderTy &Bld = CGF.Builder; 671 auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); 672 llvm::Value *NumThreads = RT.getGPUNumThreads(CGF); 673 // We assume that the warp size is a power of 2. 674 llvm::Value *Mask = Bld.CreateNUWSub(RT.getGPUWarpSize(CGF), Bld.getInt32(1)); 675 676 return Bld.CreateAnd(Bld.CreateNUWSub(NumThreads, Bld.getInt32(1)), 677 Bld.CreateNot(Mask), "master_tid"); 678 } 679 680 CGOpenMPRuntimeGPU::WorkerFunctionState::WorkerFunctionState( 681 CodeGenModule &CGM, SourceLocation Loc) 682 : WorkerFn(nullptr), CGFI(CGM.getTypes().arrangeNullaryFunction()), 683 Loc(Loc) { 684 createWorkerFunction(CGM); 685 } 686 687 void CGOpenMPRuntimeGPU::WorkerFunctionState::createWorkerFunction( 688 CodeGenModule &CGM) { 689 // Create an worker function with no arguments. 690 691 WorkerFn = llvm::Function::Create( 692 CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, 693 /*placeholder=*/"_worker", &CGM.getModule()); 694 CGM.SetInternalFunctionAttributes(GlobalDecl(), WorkerFn, CGFI); 695 WorkerFn->setDoesNotRecurse(); 696 } 697 698 CGOpenMPRuntimeGPU::ExecutionMode 699 CGOpenMPRuntimeGPU::getExecutionMode() const { 700 return CurrentExecutionMode; 701 } 702 703 static CGOpenMPRuntimeGPU::DataSharingMode 704 getDataSharingMode(CodeGenModule &CGM) { 705 return CGM.getLangOpts().OpenMPCUDAMode ? CGOpenMPRuntimeGPU::CUDA 706 : CGOpenMPRuntimeGPU::Generic; 707 } 708 709 /// Check for inner (nested) SPMD construct, if any 710 static bool hasNestedSPMDDirective(ASTContext &Ctx, 711 const OMPExecutableDirective &D) { 712 const auto *CS = D.getInnermostCapturedStmt(); 713 const auto *Body = 714 CS->getCapturedStmt()->IgnoreContainers(/*IgnoreCaptured=*/true); 715 const Stmt *ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); 716 717 if (const auto *NestedDir = 718 dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { 719 OpenMPDirectiveKind DKind = NestedDir->getDirectiveKind(); 720 switch (D.getDirectiveKind()) { 721 case OMPD_target: 722 if (isOpenMPParallelDirective(DKind)) 723 return true; 724 if (DKind == OMPD_teams) { 725 Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers( 726 /*IgnoreCaptured=*/true); 727 if (!Body) 728 return false; 729 ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); 730 if (const auto *NND = 731 dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { 732 DKind = NND->getDirectiveKind(); 733 if (isOpenMPParallelDirective(DKind)) 734 return true; 735 } 736 } 737 return false; 738 case OMPD_target_teams: 739 return isOpenMPParallelDirective(DKind); 740 case OMPD_target_simd: 741 case OMPD_target_parallel: 742 case OMPD_target_parallel_for: 743 case OMPD_target_parallel_for_simd: 744 case OMPD_target_teams_distribute: 745 case OMPD_target_teams_distribute_simd: 746 case OMPD_target_teams_distribute_parallel_for: 747 case OMPD_target_teams_distribute_parallel_for_simd: 748 case OMPD_parallel: 749 case OMPD_for: 750 case OMPD_parallel_for: 751 case OMPD_parallel_master: 752 case OMPD_parallel_sections: 753 case OMPD_for_simd: 754 case OMPD_parallel_for_simd: 755 case OMPD_cancel: 756 case OMPD_cancellation_point: 757 case OMPD_ordered: 758 case OMPD_threadprivate: 759 case OMPD_allocate: 760 case OMPD_task: 761 case OMPD_simd: 762 case OMPD_sections: 763 case OMPD_section: 764 case OMPD_single: 765 case OMPD_master: 766 case OMPD_critical: 767 case OMPD_taskyield: 768 case OMPD_barrier: 769 case OMPD_taskwait: 770 case OMPD_taskgroup: 771 case OMPD_atomic: 772 case OMPD_flush: 773 case OMPD_depobj: 774 case OMPD_scan: 775 case OMPD_teams: 776 case OMPD_target_data: 777 case OMPD_target_exit_data: 778 case OMPD_target_enter_data: 779 case OMPD_distribute: 780 case OMPD_distribute_simd: 781 case OMPD_distribute_parallel_for: 782 case OMPD_distribute_parallel_for_simd: 783 case OMPD_teams_distribute: 784 case OMPD_teams_distribute_simd: 785 case OMPD_teams_distribute_parallel_for: 786 case OMPD_teams_distribute_parallel_for_simd: 787 case OMPD_target_update: 788 case OMPD_declare_simd: 789 case OMPD_declare_variant: 790 case OMPD_begin_declare_variant: 791 case OMPD_end_declare_variant: 792 case OMPD_declare_target: 793 case OMPD_end_declare_target: 794 case OMPD_declare_reduction: 795 case OMPD_declare_mapper: 796 case OMPD_taskloop: 797 case OMPD_taskloop_simd: 798 case OMPD_master_taskloop: 799 case OMPD_master_taskloop_simd: 800 case OMPD_parallel_master_taskloop: 801 case OMPD_parallel_master_taskloop_simd: 802 case OMPD_requires: 803 case OMPD_unknown: 804 default: 805 llvm_unreachable("Unexpected directive."); 806 } 807 } 808 809 return false; 810 } 811 812 static bool supportsSPMDExecutionMode(ASTContext &Ctx, 813 const OMPExecutableDirective &D) { 814 OpenMPDirectiveKind DirectiveKind = D.getDirectiveKind(); 815 switch (DirectiveKind) { 816 case OMPD_target: 817 case OMPD_target_teams: 818 return hasNestedSPMDDirective(Ctx, D); 819 case OMPD_target_parallel: 820 case OMPD_target_parallel_for: 821 case OMPD_target_parallel_for_simd: 822 case OMPD_target_teams_distribute_parallel_for: 823 case OMPD_target_teams_distribute_parallel_for_simd: 824 case OMPD_target_simd: 825 case OMPD_target_teams_distribute_simd: 826 return true; 827 case OMPD_target_teams_distribute: 828 return false; 829 case OMPD_parallel: 830 case OMPD_for: 831 case OMPD_parallel_for: 832 case OMPD_parallel_master: 833 case OMPD_parallel_sections: 834 case OMPD_for_simd: 835 case OMPD_parallel_for_simd: 836 case OMPD_cancel: 837 case OMPD_cancellation_point: 838 case OMPD_ordered: 839 case OMPD_threadprivate: 840 case OMPD_allocate: 841 case OMPD_task: 842 case OMPD_simd: 843 case OMPD_sections: 844 case OMPD_section: 845 case OMPD_single: 846 case OMPD_master: 847 case OMPD_critical: 848 case OMPD_taskyield: 849 case OMPD_barrier: 850 case OMPD_taskwait: 851 case OMPD_taskgroup: 852 case OMPD_atomic: 853 case OMPD_flush: 854 case OMPD_depobj: 855 case OMPD_scan: 856 case OMPD_teams: 857 case OMPD_target_data: 858 case OMPD_target_exit_data: 859 case OMPD_target_enter_data: 860 case OMPD_distribute: 861 case OMPD_distribute_simd: 862 case OMPD_distribute_parallel_for: 863 case OMPD_distribute_parallel_for_simd: 864 case OMPD_teams_distribute: 865 case OMPD_teams_distribute_simd: 866 case OMPD_teams_distribute_parallel_for: 867 case OMPD_teams_distribute_parallel_for_simd: 868 case OMPD_target_update: 869 case OMPD_declare_simd: 870 case OMPD_declare_variant: 871 case OMPD_begin_declare_variant: 872 case OMPD_end_declare_variant: 873 case OMPD_declare_target: 874 case OMPD_end_declare_target: 875 case OMPD_declare_reduction: 876 case OMPD_declare_mapper: 877 case OMPD_taskloop: 878 case OMPD_taskloop_simd: 879 case OMPD_master_taskloop: 880 case OMPD_master_taskloop_simd: 881 case OMPD_parallel_master_taskloop: 882 case OMPD_parallel_master_taskloop_simd: 883 case OMPD_requires: 884 case OMPD_unknown: 885 default: 886 break; 887 } 888 llvm_unreachable( 889 "Unknown programming model for OpenMP directive on NVPTX target."); 890 } 891 892 /// Check if the directive is loops based and has schedule clause at all or has 893 /// static scheduling. 894 static bool hasStaticScheduling(const OMPExecutableDirective &D) { 895 assert(isOpenMPWorksharingDirective(D.getDirectiveKind()) && 896 isOpenMPLoopDirective(D.getDirectiveKind()) && 897 "Expected loop-based directive."); 898 return !D.hasClausesOfKind<OMPOrderedClause>() && 899 (!D.hasClausesOfKind<OMPScheduleClause>() || 900 llvm::any_of(D.getClausesOfKind<OMPScheduleClause>(), 901 [](const OMPScheduleClause *C) { 902 return C->getScheduleKind() == OMPC_SCHEDULE_static; 903 })); 904 } 905 906 /// Check for inner (nested) lightweight runtime construct, if any 907 static bool hasNestedLightweightDirective(ASTContext &Ctx, 908 const OMPExecutableDirective &D) { 909 assert(supportsSPMDExecutionMode(Ctx, D) && "Expected SPMD mode directive."); 910 const auto *CS = D.getInnermostCapturedStmt(); 911 const auto *Body = 912 CS->getCapturedStmt()->IgnoreContainers(/*IgnoreCaptured=*/true); 913 const Stmt *ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); 914 915 if (const auto *NestedDir = 916 dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { 917 OpenMPDirectiveKind DKind = NestedDir->getDirectiveKind(); 918 switch (D.getDirectiveKind()) { 919 case OMPD_target: 920 if (isOpenMPParallelDirective(DKind) && 921 isOpenMPWorksharingDirective(DKind) && isOpenMPLoopDirective(DKind) && 922 hasStaticScheduling(*NestedDir)) 923 return true; 924 if (DKind == OMPD_teams_distribute_simd || DKind == OMPD_simd) 925 return true; 926 if (DKind == OMPD_parallel) { 927 Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers( 928 /*IgnoreCaptured=*/true); 929 if (!Body) 930 return false; 931 ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); 932 if (const auto *NND = 933 dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { 934 DKind = NND->getDirectiveKind(); 935 if (isOpenMPWorksharingDirective(DKind) && 936 isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND)) 937 return true; 938 } 939 } else if (DKind == OMPD_teams) { 940 Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers( 941 /*IgnoreCaptured=*/true); 942 if (!Body) 943 return false; 944 ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); 945 if (const auto *NND = 946 dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { 947 DKind = NND->getDirectiveKind(); 948 if (isOpenMPParallelDirective(DKind) && 949 isOpenMPWorksharingDirective(DKind) && 950 isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND)) 951 return true; 952 if (DKind == OMPD_parallel) { 953 Body = NND->getInnermostCapturedStmt()->IgnoreContainers( 954 /*IgnoreCaptured=*/true); 955 if (!Body) 956 return false; 957 ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); 958 if (const auto *NND = 959 dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { 960 DKind = NND->getDirectiveKind(); 961 if (isOpenMPWorksharingDirective(DKind) && 962 isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND)) 963 return true; 964 } 965 } 966 } 967 } 968 return false; 969 case OMPD_target_teams: 970 if (isOpenMPParallelDirective(DKind) && 971 isOpenMPWorksharingDirective(DKind) && isOpenMPLoopDirective(DKind) && 972 hasStaticScheduling(*NestedDir)) 973 return true; 974 if (DKind == OMPD_distribute_simd || DKind == OMPD_simd) 975 return true; 976 if (DKind == OMPD_parallel) { 977 Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers( 978 /*IgnoreCaptured=*/true); 979 if (!Body) 980 return false; 981 ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); 982 if (const auto *NND = 983 dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { 984 DKind = NND->getDirectiveKind(); 985 if (isOpenMPWorksharingDirective(DKind) && 986 isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND)) 987 return true; 988 } 989 } 990 return false; 991 case OMPD_target_parallel: 992 if (DKind == OMPD_simd) 993 return true; 994 return isOpenMPWorksharingDirective(DKind) && 995 isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NestedDir); 996 case OMPD_target_teams_distribute: 997 case OMPD_target_simd: 998 case OMPD_target_parallel_for: 999 case OMPD_target_parallel_for_simd: 1000 case OMPD_target_teams_distribute_simd: 1001 case OMPD_target_teams_distribute_parallel_for: 1002 case OMPD_target_teams_distribute_parallel_for_simd: 1003 case OMPD_parallel: 1004 case OMPD_for: 1005 case OMPD_parallel_for: 1006 case OMPD_parallel_master: 1007 case OMPD_parallel_sections: 1008 case OMPD_for_simd: 1009 case OMPD_parallel_for_simd: 1010 case OMPD_cancel: 1011 case OMPD_cancellation_point: 1012 case OMPD_ordered: 1013 case OMPD_threadprivate: 1014 case OMPD_allocate: 1015 case OMPD_task: 1016 case OMPD_simd: 1017 case OMPD_sections: 1018 case OMPD_section: 1019 case OMPD_single: 1020 case OMPD_master: 1021 case OMPD_critical: 1022 case OMPD_taskyield: 1023 case OMPD_barrier: 1024 case OMPD_taskwait: 1025 case OMPD_taskgroup: 1026 case OMPD_atomic: 1027 case OMPD_flush: 1028 case OMPD_depobj: 1029 case OMPD_scan: 1030 case OMPD_teams: 1031 case OMPD_target_data: 1032 case OMPD_target_exit_data: 1033 case OMPD_target_enter_data: 1034 case OMPD_distribute: 1035 case OMPD_distribute_simd: 1036 case OMPD_distribute_parallel_for: 1037 case OMPD_distribute_parallel_for_simd: 1038 case OMPD_teams_distribute: 1039 case OMPD_teams_distribute_simd: 1040 case OMPD_teams_distribute_parallel_for: 1041 case OMPD_teams_distribute_parallel_for_simd: 1042 case OMPD_target_update: 1043 case OMPD_declare_simd: 1044 case OMPD_declare_variant: 1045 case OMPD_begin_declare_variant: 1046 case OMPD_end_declare_variant: 1047 case OMPD_declare_target: 1048 case OMPD_end_declare_target: 1049 case OMPD_declare_reduction: 1050 case OMPD_declare_mapper: 1051 case OMPD_taskloop: 1052 case OMPD_taskloop_simd: 1053 case OMPD_master_taskloop: 1054 case OMPD_master_taskloop_simd: 1055 case OMPD_parallel_master_taskloop: 1056 case OMPD_parallel_master_taskloop_simd: 1057 case OMPD_requires: 1058 case OMPD_unknown: 1059 default: 1060 llvm_unreachable("Unexpected directive."); 1061 } 1062 } 1063 1064 return false; 1065 } 1066 1067 /// Checks if the construct supports lightweight runtime. It must be SPMD 1068 /// construct + inner loop-based construct with static scheduling. 1069 static bool supportsLightweightRuntime(ASTContext &Ctx, 1070 const OMPExecutableDirective &D) { 1071 if (!supportsSPMDExecutionMode(Ctx, D)) 1072 return false; 1073 OpenMPDirectiveKind DirectiveKind = D.getDirectiveKind(); 1074 switch (DirectiveKind) { 1075 case OMPD_target: 1076 case OMPD_target_teams: 1077 case OMPD_target_parallel: 1078 return hasNestedLightweightDirective(Ctx, D); 1079 case OMPD_target_parallel_for: 1080 case OMPD_target_parallel_for_simd: 1081 case OMPD_target_teams_distribute_parallel_for: 1082 case OMPD_target_teams_distribute_parallel_for_simd: 1083 // (Last|First)-privates must be shared in parallel region. 1084 return hasStaticScheduling(D); 1085 case OMPD_target_simd: 1086 case OMPD_target_teams_distribute_simd: 1087 return true; 1088 case OMPD_target_teams_distribute: 1089 return false; 1090 case OMPD_parallel: 1091 case OMPD_for: 1092 case OMPD_parallel_for: 1093 case OMPD_parallel_master: 1094 case OMPD_parallel_sections: 1095 case OMPD_for_simd: 1096 case OMPD_parallel_for_simd: 1097 case OMPD_cancel: 1098 case OMPD_cancellation_point: 1099 case OMPD_ordered: 1100 case OMPD_threadprivate: 1101 case OMPD_allocate: 1102 case OMPD_task: 1103 case OMPD_simd: 1104 case OMPD_sections: 1105 case OMPD_section: 1106 case OMPD_single: 1107 case OMPD_master: 1108 case OMPD_critical: 1109 case OMPD_taskyield: 1110 case OMPD_barrier: 1111 case OMPD_taskwait: 1112 case OMPD_taskgroup: 1113 case OMPD_atomic: 1114 case OMPD_flush: 1115 case OMPD_depobj: 1116 case OMPD_scan: 1117 case OMPD_teams: 1118 case OMPD_target_data: 1119 case OMPD_target_exit_data: 1120 case OMPD_target_enter_data: 1121 case OMPD_distribute: 1122 case OMPD_distribute_simd: 1123 case OMPD_distribute_parallel_for: 1124 case OMPD_distribute_parallel_for_simd: 1125 case OMPD_teams_distribute: 1126 case OMPD_teams_distribute_simd: 1127 case OMPD_teams_distribute_parallel_for: 1128 case OMPD_teams_distribute_parallel_for_simd: 1129 case OMPD_target_update: 1130 case OMPD_declare_simd: 1131 case OMPD_declare_variant: 1132 case OMPD_begin_declare_variant: 1133 case OMPD_end_declare_variant: 1134 case OMPD_declare_target: 1135 case OMPD_end_declare_target: 1136 case OMPD_declare_reduction: 1137 case OMPD_declare_mapper: 1138 case OMPD_taskloop: 1139 case OMPD_taskloop_simd: 1140 case OMPD_master_taskloop: 1141 case OMPD_master_taskloop_simd: 1142 case OMPD_parallel_master_taskloop: 1143 case OMPD_parallel_master_taskloop_simd: 1144 case OMPD_requires: 1145 case OMPD_unknown: 1146 default: 1147 break; 1148 } 1149 llvm_unreachable( 1150 "Unknown programming model for OpenMP directive on NVPTX target."); 1151 } 1152 1153 void CGOpenMPRuntimeGPU::emitNonSPMDKernel(const OMPExecutableDirective &D, 1154 StringRef ParentName, 1155 llvm::Function *&OutlinedFn, 1156 llvm::Constant *&OutlinedFnID, 1157 bool IsOffloadEntry, 1158 const RegionCodeGenTy &CodeGen) { 1159 ExecutionRuntimeModesRAII ModeRAII(CurrentExecutionMode); 1160 EntryFunctionState EST; 1161 WorkerFunctionState WST(CGM, D.getBeginLoc()); 1162 Work.clear(); 1163 WrapperFunctionsMap.clear(); 1164 1165 // Emit target region as a standalone region. 1166 class NVPTXPrePostActionTy : public PrePostActionTy { 1167 CGOpenMPRuntimeGPU::EntryFunctionState &EST; 1168 CGOpenMPRuntimeGPU::WorkerFunctionState &WST; 1169 1170 public: 1171 NVPTXPrePostActionTy(CGOpenMPRuntimeGPU::EntryFunctionState &EST, 1172 CGOpenMPRuntimeGPU::WorkerFunctionState &WST) 1173 : EST(EST), WST(WST) {} 1174 void Enter(CodeGenFunction &CGF) override { 1175 auto &RT = 1176 static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); 1177 RT.emitNonSPMDEntryHeader(CGF, EST, WST); 1178 // Skip target region initialization. 1179 RT.setLocThreadIdInsertPt(CGF, /*AtCurrentPoint=*/true); 1180 } 1181 void Exit(CodeGenFunction &CGF) override { 1182 auto &RT = 1183 static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); 1184 RT.clearLocThreadIdInsertPt(CGF); 1185 RT.emitNonSPMDEntryFooter(CGF, EST); 1186 } 1187 } Action(EST, WST); 1188 CodeGen.setAction(Action); 1189 IsInTTDRegion = true; 1190 // Reserve place for the globalized memory. 1191 GlobalizedRecords.emplace_back(); 1192 if (!KernelStaticGlobalized) { 1193 KernelStaticGlobalized = new llvm::GlobalVariable( 1194 CGM.getModule(), CGM.VoidPtrTy, /*isConstant=*/false, 1195 llvm::GlobalValue::InternalLinkage, 1196 llvm::ConstantPointerNull::get(CGM.VoidPtrTy), 1197 "_openmp_kernel_static_glob_rd$ptr", /*InsertBefore=*/nullptr, 1198 llvm::GlobalValue::NotThreadLocal, 1199 CGM.getContext().getTargetAddressSpace(LangAS::cuda_shared)); 1200 } 1201 emitTargetOutlinedFunctionHelper(D, ParentName, OutlinedFn, OutlinedFnID, 1202 IsOffloadEntry, CodeGen); 1203 IsInTTDRegion = false; 1204 1205 // Now change the name of the worker function to correspond to this target 1206 // region's entry function. 1207 WST.WorkerFn->setName(Twine(OutlinedFn->getName(), "_worker")); 1208 1209 // Create the worker function 1210 emitWorkerFunction(WST); 1211 } 1212 1213 // Setup NVPTX threads for master-worker OpenMP scheme. 1214 void CGOpenMPRuntimeGPU::emitNonSPMDEntryHeader(CodeGenFunction &CGF, 1215 EntryFunctionState &EST, 1216 WorkerFunctionState &WST) { 1217 CGBuilderTy &Bld = CGF.Builder; 1218 1219 llvm::BasicBlock *WorkerBB = CGF.createBasicBlock(".worker"); 1220 llvm::BasicBlock *MasterCheckBB = CGF.createBasicBlock(".mastercheck"); 1221 llvm::BasicBlock *MasterBB = CGF.createBasicBlock(".master"); 1222 EST.ExitBB = CGF.createBasicBlock(".exit"); 1223 1224 auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); 1225 llvm::Value *IsWorker = 1226 Bld.CreateICmpULT(RT.getGPUThreadID(CGF), getThreadLimit(CGF)); 1227 Bld.CreateCondBr(IsWorker, WorkerBB, MasterCheckBB); 1228 1229 CGF.EmitBlock(WorkerBB); 1230 emitCall(CGF, WST.Loc, WST.WorkerFn); 1231 CGF.EmitBranch(EST.ExitBB); 1232 1233 CGF.EmitBlock(MasterCheckBB); 1234 llvm::Value *IsMaster = 1235 Bld.CreateICmpEQ(RT.getGPUThreadID(CGF), getMasterThreadID(CGF)); 1236 Bld.CreateCondBr(IsMaster, MasterBB, EST.ExitBB); 1237 1238 CGF.EmitBlock(MasterBB); 1239 IsInTargetMasterThreadRegion = true; 1240 // SEQUENTIAL (MASTER) REGION START 1241 // First action in sequential region: 1242 // Initialize the state of the OpenMP runtime library on the GPU. 1243 // TODO: Optimize runtime initialization and pass in correct value. 1244 llvm::Value *Args[] = {getThreadLimit(CGF), 1245 Bld.getInt16(/*RequiresOMPRuntime=*/1)}; 1246 CGF.EmitRuntimeCall( 1247 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_kernel_init), Args); 1248 1249 // For data sharing, we need to initialize the stack. 1250 CGF.EmitRuntimeCall( 1251 createNVPTXRuntimeFunction( 1252 OMPRTL_NVPTX__kmpc_data_sharing_init_stack)); 1253 1254 emitGenericVarsProlog(CGF, WST.Loc); 1255 } 1256 1257 void CGOpenMPRuntimeGPU::emitNonSPMDEntryFooter(CodeGenFunction &CGF, 1258 EntryFunctionState &EST) { 1259 IsInTargetMasterThreadRegion = false; 1260 if (!CGF.HaveInsertPoint()) 1261 return; 1262 1263 emitGenericVarsEpilog(CGF); 1264 1265 if (!EST.ExitBB) 1266 EST.ExitBB = CGF.createBasicBlock(".exit"); 1267 1268 llvm::BasicBlock *TerminateBB = CGF.createBasicBlock(".termination.notifier"); 1269 CGF.EmitBranch(TerminateBB); 1270 1271 CGF.EmitBlock(TerminateBB); 1272 // Signal termination condition. 1273 // TODO: Optimize runtime initialization and pass in correct value. 1274 llvm::Value *Args[] = {CGF.Builder.getInt16(/*IsOMPRuntimeInitialized=*/1)}; 1275 CGF.EmitRuntimeCall( 1276 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_kernel_deinit), Args); 1277 // Barrier to terminate worker threads. 1278 syncCTAThreads(CGF); 1279 // Master thread jumps to exit point. 1280 CGF.EmitBranch(EST.ExitBB); 1281 1282 CGF.EmitBlock(EST.ExitBB); 1283 EST.ExitBB = nullptr; 1284 } 1285 1286 void CGOpenMPRuntimeGPU::emitSPMDKernel(const OMPExecutableDirective &D, 1287 StringRef ParentName, 1288 llvm::Function *&OutlinedFn, 1289 llvm::Constant *&OutlinedFnID, 1290 bool IsOffloadEntry, 1291 const RegionCodeGenTy &CodeGen) { 1292 ExecutionRuntimeModesRAII ModeRAII( 1293 CurrentExecutionMode, RequiresFullRuntime, 1294 CGM.getLangOpts().OpenMPCUDAForceFullRuntime || 1295 !supportsLightweightRuntime(CGM.getContext(), D)); 1296 EntryFunctionState EST; 1297 1298 // Emit target region as a standalone region. 1299 class NVPTXPrePostActionTy : public PrePostActionTy { 1300 CGOpenMPRuntimeGPU &RT; 1301 CGOpenMPRuntimeGPU::EntryFunctionState &EST; 1302 const OMPExecutableDirective &D; 1303 1304 public: 1305 NVPTXPrePostActionTy(CGOpenMPRuntimeGPU &RT, 1306 CGOpenMPRuntimeGPU::EntryFunctionState &EST, 1307 const OMPExecutableDirective &D) 1308 : RT(RT), EST(EST), D(D) {} 1309 void Enter(CodeGenFunction &CGF) override { 1310 RT.emitSPMDEntryHeader(CGF, EST, D); 1311 // Skip target region initialization. 1312 RT.setLocThreadIdInsertPt(CGF, /*AtCurrentPoint=*/true); 1313 } 1314 void Exit(CodeGenFunction &CGF) override { 1315 RT.clearLocThreadIdInsertPt(CGF); 1316 RT.emitSPMDEntryFooter(CGF, EST); 1317 } 1318 } Action(*this, EST, D); 1319 CodeGen.setAction(Action); 1320 IsInTTDRegion = true; 1321 // Reserve place for the globalized memory. 1322 GlobalizedRecords.emplace_back(); 1323 if (!KernelStaticGlobalized) { 1324 KernelStaticGlobalized = new llvm::GlobalVariable( 1325 CGM.getModule(), CGM.VoidPtrTy, /*isConstant=*/false, 1326 llvm::GlobalValue::InternalLinkage, 1327 llvm::ConstantPointerNull::get(CGM.VoidPtrTy), 1328 "_openmp_kernel_static_glob_rd$ptr", /*InsertBefore=*/nullptr, 1329 llvm::GlobalValue::NotThreadLocal, 1330 CGM.getContext().getTargetAddressSpace(LangAS::cuda_shared)); 1331 } 1332 emitTargetOutlinedFunctionHelper(D, ParentName, OutlinedFn, OutlinedFnID, 1333 IsOffloadEntry, CodeGen); 1334 IsInTTDRegion = false; 1335 } 1336 1337 void CGOpenMPRuntimeGPU::emitSPMDEntryHeader( 1338 CodeGenFunction &CGF, EntryFunctionState &EST, 1339 const OMPExecutableDirective &D) { 1340 CGBuilderTy &Bld = CGF.Builder; 1341 1342 // Setup BBs in entry function. 1343 llvm::BasicBlock *ExecuteBB = CGF.createBasicBlock(".execute"); 1344 EST.ExitBB = CGF.createBasicBlock(".exit"); 1345 1346 llvm::Value *Args[] = {getThreadLimit(CGF, /*IsInSPMDExecutionMode=*/true), 1347 /*RequiresOMPRuntime=*/ 1348 Bld.getInt16(RequiresFullRuntime ? 1 : 0), 1349 /*RequiresDataSharing=*/Bld.getInt16(0)}; 1350 CGF.EmitRuntimeCall( 1351 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_spmd_kernel_init), Args); 1352 1353 if (RequiresFullRuntime) { 1354 // For data sharing, we need to initialize the stack. 1355 CGF.EmitRuntimeCall(createNVPTXRuntimeFunction( 1356 OMPRTL_NVPTX__kmpc_data_sharing_init_stack_spmd)); 1357 } 1358 1359 CGF.EmitBranch(ExecuteBB); 1360 1361 CGF.EmitBlock(ExecuteBB); 1362 1363 IsInTargetMasterThreadRegion = true; 1364 } 1365 1366 void CGOpenMPRuntimeGPU::emitSPMDEntryFooter(CodeGenFunction &CGF, 1367 EntryFunctionState &EST) { 1368 IsInTargetMasterThreadRegion = false; 1369 if (!CGF.HaveInsertPoint()) 1370 return; 1371 1372 if (!EST.ExitBB) 1373 EST.ExitBB = CGF.createBasicBlock(".exit"); 1374 1375 llvm::BasicBlock *OMPDeInitBB = CGF.createBasicBlock(".omp.deinit"); 1376 CGF.EmitBranch(OMPDeInitBB); 1377 1378 CGF.EmitBlock(OMPDeInitBB); 1379 // DeInitialize the OMP state in the runtime; called by all active threads. 1380 llvm::Value *Args[] = {/*RequiresOMPRuntime=*/ 1381 CGF.Builder.getInt16(RequiresFullRuntime ? 1 : 0)}; 1382 CGF.EmitRuntimeCall( 1383 createNVPTXRuntimeFunction( 1384 OMPRTL_NVPTX__kmpc_spmd_kernel_deinit_v2), Args); 1385 CGF.EmitBranch(EST.ExitBB); 1386 1387 CGF.EmitBlock(EST.ExitBB); 1388 EST.ExitBB = nullptr; 1389 } 1390 1391 // Create a unique global variable to indicate the execution mode of this target 1392 // region. The execution mode is either 'generic', or 'spmd' depending on the 1393 // target directive. This variable is picked up by the offload library to setup 1394 // the device appropriately before kernel launch. If the execution mode is 1395 // 'generic', the runtime reserves one warp for the master, otherwise, all 1396 // warps participate in parallel work. 1397 static void setPropertyExecutionMode(CodeGenModule &CGM, StringRef Name, 1398 bool Mode) { 1399 auto *GVMode = 1400 new llvm::GlobalVariable(CGM.getModule(), CGM.Int8Ty, /*isConstant=*/true, 1401 llvm::GlobalValue::WeakAnyLinkage, 1402 llvm::ConstantInt::get(CGM.Int8Ty, Mode ? 0 : 1), 1403 Twine(Name, "_exec_mode")); 1404 CGM.addCompilerUsedGlobal(GVMode); 1405 } 1406 1407 void CGOpenMPRuntimeGPU::emitWorkerFunction(WorkerFunctionState &WST) { 1408 ASTContext &Ctx = CGM.getContext(); 1409 1410 CodeGenFunction CGF(CGM, /*suppressNewContext=*/true); 1411 CGF.StartFunction(GlobalDecl(), Ctx.VoidTy, WST.WorkerFn, WST.CGFI, {}, 1412 WST.Loc, WST.Loc); 1413 emitWorkerLoop(CGF, WST); 1414 CGF.FinishFunction(); 1415 } 1416 1417 void CGOpenMPRuntimeGPU::emitWorkerLoop(CodeGenFunction &CGF, 1418 WorkerFunctionState &WST) { 1419 // 1420 // The workers enter this loop and wait for parallel work from the master. 1421 // When the master encounters a parallel region it sets up the work + variable 1422 // arguments, and wakes up the workers. The workers first check to see if 1423 // they are required for the parallel region, i.e., within the # of requested 1424 // parallel threads. The activated workers load the variable arguments and 1425 // execute the parallel work. 1426 // 1427 1428 CGBuilderTy &Bld = CGF.Builder; 1429 1430 llvm::BasicBlock *AwaitBB = CGF.createBasicBlock(".await.work"); 1431 llvm::BasicBlock *SelectWorkersBB = CGF.createBasicBlock(".select.workers"); 1432 llvm::BasicBlock *ExecuteBB = CGF.createBasicBlock(".execute.parallel"); 1433 llvm::BasicBlock *TerminateBB = CGF.createBasicBlock(".terminate.parallel"); 1434 llvm::BasicBlock *BarrierBB = CGF.createBasicBlock(".barrier.parallel"); 1435 llvm::BasicBlock *ExitBB = CGF.createBasicBlock(".exit"); 1436 1437 CGF.EmitBranch(AwaitBB); 1438 1439 // Workers wait for work from master. 1440 CGF.EmitBlock(AwaitBB); 1441 // Wait for parallel work 1442 syncCTAThreads(CGF); 1443 1444 Address WorkFn = 1445 CGF.CreateDefaultAlignTempAlloca(CGF.Int8PtrTy, /*Name=*/"work_fn"); 1446 Address ExecStatus = 1447 CGF.CreateDefaultAlignTempAlloca(CGF.Int8Ty, /*Name=*/"exec_status"); 1448 CGF.InitTempAlloca(ExecStatus, Bld.getInt8(/*C=*/0)); 1449 CGF.InitTempAlloca(WorkFn, llvm::Constant::getNullValue(CGF.Int8PtrTy)); 1450 1451 // TODO: Optimize runtime initialization and pass in correct value. 1452 llvm::Value *Args[] = {WorkFn.getPointer()}; 1453 llvm::Value *Ret = CGF.EmitRuntimeCall( 1454 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_kernel_parallel), Args); 1455 Bld.CreateStore(Bld.CreateZExt(Ret, CGF.Int8Ty), ExecStatus); 1456 1457 // On termination condition (workid == 0), exit loop. 1458 llvm::Value *WorkID = Bld.CreateLoad(WorkFn); 1459 llvm::Value *ShouldTerminate = Bld.CreateIsNull(WorkID, "should_terminate"); 1460 Bld.CreateCondBr(ShouldTerminate, ExitBB, SelectWorkersBB); 1461 1462 // Activate requested workers. 1463 CGF.EmitBlock(SelectWorkersBB); 1464 llvm::Value *IsActive = 1465 Bld.CreateIsNotNull(Bld.CreateLoad(ExecStatus), "is_active"); 1466 Bld.CreateCondBr(IsActive, ExecuteBB, BarrierBB); 1467 1468 // Signal start of parallel region. 1469 CGF.EmitBlock(ExecuteBB); 1470 // Skip initialization. 1471 setLocThreadIdInsertPt(CGF, /*AtCurrentPoint=*/true); 1472 1473 // Process work items: outlined parallel functions. 1474 for (llvm::Function *W : Work) { 1475 // Try to match this outlined function. 1476 llvm::Value *ID = Bld.CreatePointerBitCastOrAddrSpaceCast(W, CGM.Int8PtrTy); 1477 1478 llvm::Value *WorkFnMatch = 1479 Bld.CreateICmpEQ(Bld.CreateLoad(WorkFn), ID, "work_match"); 1480 1481 llvm::BasicBlock *ExecuteFNBB = CGF.createBasicBlock(".execute.fn"); 1482 llvm::BasicBlock *CheckNextBB = CGF.createBasicBlock(".check.next"); 1483 Bld.CreateCondBr(WorkFnMatch, ExecuteFNBB, CheckNextBB); 1484 1485 // Execute this outlined function. 1486 CGF.EmitBlock(ExecuteFNBB); 1487 1488 // Insert call to work function via shared wrapper. The shared 1489 // wrapper takes two arguments: 1490 // - the parallelism level; 1491 // - the thread ID; 1492 emitCall(CGF, WST.Loc, W, 1493 {Bld.getInt16(/*ParallelLevel=*/0), getThreadID(CGF, WST.Loc)}); 1494 1495 // Go to end of parallel region. 1496 CGF.EmitBranch(TerminateBB); 1497 1498 CGF.EmitBlock(CheckNextBB); 1499 } 1500 // Default case: call to outlined function through pointer if the target 1501 // region makes a declare target call that may contain an orphaned parallel 1502 // directive. 1503 auto *ParallelFnTy = 1504 llvm::FunctionType::get(CGM.VoidTy, {CGM.Int16Ty, CGM.Int32Ty}, 1505 /*isVarArg=*/false); 1506 llvm::Value *WorkFnCast = 1507 Bld.CreateBitCast(WorkID, ParallelFnTy->getPointerTo()); 1508 // Insert call to work function via shared wrapper. The shared 1509 // wrapper takes two arguments: 1510 // - the parallelism level; 1511 // - the thread ID; 1512 emitCall(CGF, WST.Loc, {ParallelFnTy, WorkFnCast}, 1513 {Bld.getInt16(/*ParallelLevel=*/0), getThreadID(CGF, WST.Loc)}); 1514 // Go to end of parallel region. 1515 CGF.EmitBranch(TerminateBB); 1516 1517 // Signal end of parallel region. 1518 CGF.EmitBlock(TerminateBB); 1519 CGF.EmitRuntimeCall( 1520 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_kernel_end_parallel), 1521 llvm::None); 1522 CGF.EmitBranch(BarrierBB); 1523 1524 // All active and inactive workers wait at a barrier after parallel region. 1525 CGF.EmitBlock(BarrierBB); 1526 // Barrier after parallel region. 1527 syncCTAThreads(CGF); 1528 CGF.EmitBranch(AwaitBB); 1529 1530 // Exit target region. 1531 CGF.EmitBlock(ExitBB); 1532 // Skip initialization. 1533 clearLocThreadIdInsertPt(CGF); 1534 } 1535 1536 /// Returns specified OpenMP runtime function for the current OpenMP 1537 /// implementation. Specialized for the NVPTX device. 1538 /// \param Function OpenMP runtime function. 1539 /// \return Specified function. 1540 llvm::FunctionCallee 1541 CGOpenMPRuntimeGPU::createNVPTXRuntimeFunction(unsigned Function) { 1542 llvm::FunctionCallee RTLFn = nullptr; 1543 switch (static_cast<OpenMPRTLFunctionNVPTX>(Function)) { 1544 case OMPRTL_NVPTX__kmpc_kernel_init: { 1545 // Build void __kmpc_kernel_init(kmp_int32 thread_limit, int16_t 1546 // RequiresOMPRuntime); 1547 llvm::Type *TypeParams[] = {CGM.Int32Ty, CGM.Int16Ty}; 1548 auto *FnTy = 1549 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false); 1550 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_kernel_init"); 1551 break; 1552 } 1553 case OMPRTL_NVPTX__kmpc_kernel_deinit: { 1554 // Build void __kmpc_kernel_deinit(int16_t IsOMPRuntimeInitialized); 1555 llvm::Type *TypeParams[] = {CGM.Int16Ty}; 1556 auto *FnTy = 1557 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false); 1558 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_kernel_deinit"); 1559 break; 1560 } 1561 case OMPRTL_NVPTX__kmpc_spmd_kernel_init: { 1562 // Build void __kmpc_spmd_kernel_init(kmp_int32 thread_limit, 1563 // int16_t RequiresOMPRuntime, int16_t RequiresDataSharing); 1564 llvm::Type *TypeParams[] = {CGM.Int32Ty, CGM.Int16Ty, CGM.Int16Ty}; 1565 auto *FnTy = 1566 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false); 1567 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_spmd_kernel_init"); 1568 break; 1569 } 1570 case OMPRTL_NVPTX__kmpc_spmd_kernel_deinit_v2: { 1571 // Build void __kmpc_spmd_kernel_deinit_v2(int16_t RequiresOMPRuntime); 1572 llvm::Type *TypeParams[] = {CGM.Int16Ty}; 1573 auto *FnTy = 1574 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false); 1575 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_spmd_kernel_deinit_v2"); 1576 break; 1577 } 1578 case OMPRTL_NVPTX__kmpc_kernel_prepare_parallel: { 1579 /// Build void __kmpc_kernel_prepare_parallel( 1580 /// void *outlined_function); 1581 llvm::Type *TypeParams[] = {CGM.Int8PtrTy}; 1582 auto *FnTy = 1583 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false); 1584 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_kernel_prepare_parallel"); 1585 break; 1586 } 1587 case OMPRTL_NVPTX__kmpc_kernel_parallel: { 1588 /// Build bool __kmpc_kernel_parallel(void **outlined_function); 1589 llvm::Type *TypeParams[] = {CGM.Int8PtrPtrTy}; 1590 llvm::Type *RetTy = CGM.getTypes().ConvertType(CGM.getContext().BoolTy); 1591 auto *FnTy = 1592 llvm::FunctionType::get(RetTy, TypeParams, /*isVarArg*/ false); 1593 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_kernel_parallel"); 1594 break; 1595 } 1596 case OMPRTL_NVPTX__kmpc_kernel_end_parallel: { 1597 /// Build void __kmpc_kernel_end_parallel(); 1598 auto *FnTy = 1599 llvm::FunctionType::get(CGM.VoidTy, llvm::None, /*isVarArg*/ false); 1600 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_kernel_end_parallel"); 1601 break; 1602 } 1603 case OMPRTL_NVPTX__kmpc_serialized_parallel: { 1604 // Build void __kmpc_serialized_parallel(ident_t *loc, kmp_int32 1605 // global_tid); 1606 llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty}; 1607 auto *FnTy = 1608 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false); 1609 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_serialized_parallel"); 1610 break; 1611 } 1612 case OMPRTL_NVPTX__kmpc_end_serialized_parallel: { 1613 // Build void __kmpc_end_serialized_parallel(ident_t *loc, kmp_int32 1614 // global_tid); 1615 llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty}; 1616 auto *FnTy = 1617 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false); 1618 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_end_serialized_parallel"); 1619 break; 1620 } 1621 case OMPRTL_NVPTX__kmpc_shuffle_int32: { 1622 // Build int32_t __kmpc_shuffle_int32(int32_t element, 1623 // int16_t lane_offset, int16_t warp_size); 1624 llvm::Type *TypeParams[] = {CGM.Int32Ty, CGM.Int16Ty, CGM.Int16Ty}; 1625 auto *FnTy = 1626 llvm::FunctionType::get(CGM.Int32Ty, TypeParams, /*isVarArg*/ false); 1627 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_shuffle_int32"); 1628 break; 1629 } 1630 case OMPRTL_NVPTX__kmpc_shuffle_int64: { 1631 // Build int64_t __kmpc_shuffle_int64(int64_t element, 1632 // int16_t lane_offset, int16_t warp_size); 1633 llvm::Type *TypeParams[] = {CGM.Int64Ty, CGM.Int16Ty, CGM.Int16Ty}; 1634 auto *FnTy = 1635 llvm::FunctionType::get(CGM.Int64Ty, TypeParams, /*isVarArg*/ false); 1636 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_shuffle_int64"); 1637 break; 1638 } 1639 case OMPRTL_NVPTX__kmpc_nvptx_parallel_reduce_nowait_v2: { 1640 // Build int32_t kmpc_nvptx_parallel_reduce_nowait_v2(ident_t *loc, 1641 // kmp_int32 global_tid, kmp_int32 num_vars, size_t reduce_size, void* 1642 // reduce_data, void (*kmp_ShuffleReductFctPtr)(void *rhsData, int16_t 1643 // lane_id, int16_t lane_offset, int16_t Algorithm Version), void 1644 // (*kmp_InterWarpCopyFctPtr)(void* src, int warp_num)); 1645 llvm::Type *ShuffleReduceTypeParams[] = {CGM.VoidPtrTy, CGM.Int16Ty, 1646 CGM.Int16Ty, CGM.Int16Ty}; 1647 auto *ShuffleReduceFnTy = 1648 llvm::FunctionType::get(CGM.VoidTy, ShuffleReduceTypeParams, 1649 /*isVarArg=*/false); 1650 llvm::Type *InterWarpCopyTypeParams[] = {CGM.VoidPtrTy, CGM.Int32Ty}; 1651 auto *InterWarpCopyFnTy = 1652 llvm::FunctionType::get(CGM.VoidTy, InterWarpCopyTypeParams, 1653 /*isVarArg=*/false); 1654 llvm::Type *TypeParams[] = {getIdentTyPointerTy(), 1655 CGM.Int32Ty, 1656 CGM.Int32Ty, 1657 CGM.SizeTy, 1658 CGM.VoidPtrTy, 1659 ShuffleReduceFnTy->getPointerTo(), 1660 InterWarpCopyFnTy->getPointerTo()}; 1661 auto *FnTy = 1662 llvm::FunctionType::get(CGM.Int32Ty, TypeParams, /*isVarArg=*/false); 1663 RTLFn = CGM.CreateRuntimeFunction( 1664 FnTy, /*Name=*/"__kmpc_nvptx_parallel_reduce_nowait_v2"); 1665 break; 1666 } 1667 case OMPRTL_NVPTX__kmpc_end_reduce_nowait: { 1668 // Build __kmpc_end_reduce_nowait(kmp_int32 global_tid); 1669 llvm::Type *TypeParams[] = {CGM.Int32Ty}; 1670 auto *FnTy = 1671 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg=*/false); 1672 RTLFn = CGM.CreateRuntimeFunction( 1673 FnTy, /*Name=*/"__kmpc_nvptx_end_reduce_nowait"); 1674 break; 1675 } 1676 case OMPRTL_NVPTX__kmpc_nvptx_teams_reduce_nowait_v2: { 1677 // Build int32_t __kmpc_nvptx_teams_reduce_nowait_v2(ident_t *loc, kmp_int32 1678 // global_tid, void *global_buffer, int32_t num_of_records, void* 1679 // reduce_data, 1680 // void (*kmp_ShuffleReductFctPtr)(void *rhsData, int16_t lane_id, int16_t 1681 // lane_offset, int16_t shortCircuit), 1682 // void (*kmp_InterWarpCopyFctPtr)(void* src, int32_t warp_num), void 1683 // (*kmp_ListToGlobalCpyFctPtr)(void *buffer, int idx, void *reduce_data), 1684 // void (*kmp_GlobalToListCpyFctPtr)(void *buffer, int idx, 1685 // void *reduce_data), void (*kmp_GlobalToListCpyPtrsFctPtr)(void *buffer, 1686 // int idx, void *reduce_data), void (*kmp_GlobalToListRedFctPtr)(void 1687 // *buffer, int idx, void *reduce_data)); 1688 llvm::Type *ShuffleReduceTypeParams[] = {CGM.VoidPtrTy, CGM.Int16Ty, 1689 CGM.Int16Ty, CGM.Int16Ty}; 1690 auto *ShuffleReduceFnTy = 1691 llvm::FunctionType::get(CGM.VoidTy, ShuffleReduceTypeParams, 1692 /*isVarArg=*/false); 1693 llvm::Type *InterWarpCopyTypeParams[] = {CGM.VoidPtrTy, CGM.Int32Ty}; 1694 auto *InterWarpCopyFnTy = 1695 llvm::FunctionType::get(CGM.VoidTy, InterWarpCopyTypeParams, 1696 /*isVarArg=*/false); 1697 llvm::Type *GlobalListTypeParams[] = {CGM.VoidPtrTy, CGM.IntTy, 1698 CGM.VoidPtrTy}; 1699 auto *GlobalListFnTy = 1700 llvm::FunctionType::get(CGM.VoidTy, GlobalListTypeParams, 1701 /*isVarArg=*/false); 1702 llvm::Type *TypeParams[] = {getIdentTyPointerTy(), 1703 CGM.Int32Ty, 1704 CGM.VoidPtrTy, 1705 CGM.Int32Ty, 1706 CGM.VoidPtrTy, 1707 ShuffleReduceFnTy->getPointerTo(), 1708 InterWarpCopyFnTy->getPointerTo(), 1709 GlobalListFnTy->getPointerTo(), 1710 GlobalListFnTy->getPointerTo(), 1711 GlobalListFnTy->getPointerTo(), 1712 GlobalListFnTy->getPointerTo()}; 1713 auto *FnTy = 1714 llvm::FunctionType::get(CGM.Int32Ty, TypeParams, /*isVarArg=*/false); 1715 RTLFn = CGM.CreateRuntimeFunction( 1716 FnTy, /*Name=*/"__kmpc_nvptx_teams_reduce_nowait_v2"); 1717 break; 1718 } 1719 case OMPRTL_NVPTX__kmpc_data_sharing_init_stack: { 1720 /// Build void __kmpc_data_sharing_init_stack(); 1721 auto *FnTy = 1722 llvm::FunctionType::get(CGM.VoidTy, llvm::None, /*isVarArg*/ false); 1723 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_data_sharing_init_stack"); 1724 break; 1725 } 1726 case OMPRTL_NVPTX__kmpc_data_sharing_init_stack_spmd: { 1727 /// Build void __kmpc_data_sharing_init_stack_spmd(); 1728 auto *FnTy = 1729 llvm::FunctionType::get(CGM.VoidTy, llvm::None, /*isVarArg*/ false); 1730 RTLFn = 1731 CGM.CreateRuntimeFunction(FnTy, "__kmpc_data_sharing_init_stack_spmd"); 1732 break; 1733 } 1734 case OMPRTL_NVPTX__kmpc_data_sharing_coalesced_push_stack: { 1735 // Build void *__kmpc_data_sharing_coalesced_push_stack(size_t size, 1736 // int16_t UseSharedMemory); 1737 llvm::Type *TypeParams[] = {CGM.SizeTy, CGM.Int16Ty}; 1738 auto *FnTy = 1739 llvm::FunctionType::get(CGM.VoidPtrTy, TypeParams, /*isVarArg=*/false); 1740 RTLFn = CGM.CreateRuntimeFunction( 1741 FnTy, /*Name=*/"__kmpc_data_sharing_coalesced_push_stack"); 1742 break; 1743 } 1744 case OMPRTL_NVPTX__kmpc_data_sharing_push_stack: { 1745 // Build void *__kmpc_data_sharing_push_stack(size_t size, int16_t 1746 // UseSharedMemory); 1747 llvm::Type *TypeParams[] = {CGM.SizeTy, CGM.Int16Ty}; 1748 auto *FnTy = 1749 llvm::FunctionType::get(CGM.VoidPtrTy, TypeParams, /*isVarArg=*/false); 1750 RTLFn = CGM.CreateRuntimeFunction( 1751 FnTy, /*Name=*/"__kmpc_data_sharing_push_stack"); 1752 break; 1753 } 1754 case OMPRTL_NVPTX__kmpc_data_sharing_pop_stack: { 1755 // Build void __kmpc_data_sharing_pop_stack(void *a); 1756 llvm::Type *TypeParams[] = {CGM.VoidPtrTy}; 1757 auto *FnTy = 1758 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg=*/false); 1759 RTLFn = CGM.CreateRuntimeFunction(FnTy, 1760 /*Name=*/"__kmpc_data_sharing_pop_stack"); 1761 break; 1762 } 1763 case OMPRTL_NVPTX__kmpc_begin_sharing_variables: { 1764 /// Build void __kmpc_begin_sharing_variables(void ***args, 1765 /// size_t n_args); 1766 llvm::Type *TypeParams[] = {CGM.Int8PtrPtrTy->getPointerTo(), CGM.SizeTy}; 1767 auto *FnTy = 1768 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false); 1769 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_begin_sharing_variables"); 1770 break; 1771 } 1772 case OMPRTL_NVPTX__kmpc_end_sharing_variables: { 1773 /// Build void __kmpc_end_sharing_variables(); 1774 auto *FnTy = 1775 llvm::FunctionType::get(CGM.VoidTy, llvm::None, /*isVarArg*/ false); 1776 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_end_sharing_variables"); 1777 break; 1778 } 1779 case OMPRTL_NVPTX__kmpc_get_shared_variables: { 1780 /// Build void __kmpc_get_shared_variables(void ***GlobalArgs); 1781 llvm::Type *TypeParams[] = {CGM.Int8PtrPtrTy->getPointerTo()}; 1782 auto *FnTy = 1783 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false); 1784 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_get_shared_variables"); 1785 break; 1786 } 1787 case OMPRTL_NVPTX__kmpc_parallel_level: { 1788 // Build uint16_t __kmpc_parallel_level(ident_t *loc, kmp_int32 global_tid); 1789 llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty}; 1790 auto *FnTy = 1791 llvm::FunctionType::get(CGM.Int16Ty, TypeParams, /*isVarArg*/ false); 1792 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_parallel_level"); 1793 break; 1794 } 1795 case OMPRTL_NVPTX__kmpc_is_spmd_exec_mode: { 1796 // Build int8_t __kmpc_is_spmd_exec_mode(); 1797 auto *FnTy = llvm::FunctionType::get(CGM.Int8Ty, /*isVarArg=*/false); 1798 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_is_spmd_exec_mode"); 1799 break; 1800 } 1801 case OMPRTL_NVPTX__kmpc_get_team_static_memory: { 1802 // Build void __kmpc_get_team_static_memory(int16_t isSPMDExecutionMode, 1803 // const void *buf, size_t size, int16_t is_shared, const void **res); 1804 llvm::Type *TypeParams[] = {CGM.Int16Ty, CGM.VoidPtrTy, CGM.SizeTy, 1805 CGM.Int16Ty, CGM.VoidPtrPtrTy}; 1806 auto *FnTy = 1807 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false); 1808 RTLFn = CGM.CreateRuntimeFunction(FnTy, "__kmpc_get_team_static_memory"); 1809 break; 1810 } 1811 case OMPRTL_NVPTX__kmpc_restore_team_static_memory: { 1812 // Build void __kmpc_restore_team_static_memory(int16_t isSPMDExecutionMode, 1813 // int16_t is_shared); 1814 llvm::Type *TypeParams[] = {CGM.Int16Ty, CGM.Int16Ty}; 1815 auto *FnTy = 1816 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg=*/false); 1817 RTLFn = 1818 CGM.CreateRuntimeFunction(FnTy, "__kmpc_restore_team_static_memory"); 1819 break; 1820 } 1821 case OMPRTL__kmpc_barrier: { 1822 // Build void __kmpc_barrier(ident_t *loc, kmp_int32 global_tid); 1823 llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty}; 1824 auto *FnTy = 1825 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false); 1826 RTLFn = 1827 CGM.CreateConvergentRuntimeFunction(FnTy, /*Name*/ "__kmpc_barrier"); 1828 break; 1829 } 1830 case OMPRTL__kmpc_barrier_simple_spmd: { 1831 // Build void __kmpc_barrier_simple_spmd(ident_t *loc, kmp_int32 1832 // global_tid); 1833 llvm::Type *TypeParams[] = {getIdentTyPointerTy(), CGM.Int32Ty}; 1834 auto *FnTy = 1835 llvm::FunctionType::get(CGM.VoidTy, TypeParams, /*isVarArg*/ false); 1836 RTLFn = CGM.CreateConvergentRuntimeFunction( 1837 FnTy, /*Name*/ "__kmpc_barrier_simple_spmd"); 1838 break; 1839 } 1840 case OMPRTL_NVPTX__kmpc_warp_active_thread_mask: { 1841 // Build int32_t __kmpc_warp_active_thread_mask(void); 1842 auto *FnTy = 1843 llvm::FunctionType::get(CGM.Int32Ty, llvm::None, /*isVarArg=*/false); 1844 RTLFn = CGM.CreateConvergentRuntimeFunction(FnTy, "__kmpc_warp_active_thread_mask"); 1845 break; 1846 } 1847 case OMPRTL_NVPTX__kmpc_syncwarp: { 1848 // Build void __kmpc_syncwarp(kmp_int32 Mask); 1849 auto *FnTy = 1850 llvm::FunctionType::get(CGM.VoidTy, CGM.Int32Ty, /*isVarArg=*/false); 1851 RTLFn = CGM.CreateConvergentRuntimeFunction(FnTy, "__kmpc_syncwarp"); 1852 break; 1853 } 1854 } 1855 return RTLFn; 1856 } 1857 1858 void CGOpenMPRuntimeGPU::createOffloadEntry(llvm::Constant *ID, 1859 llvm::Constant *Addr, 1860 uint64_t Size, int32_t, 1861 llvm::GlobalValue::LinkageTypes) { 1862 // TODO: Add support for global variables on the device after declare target 1863 // support. 1864 if (!isa<llvm::Function>(Addr)) 1865 return; 1866 llvm::Module &M = CGM.getModule(); 1867 llvm::LLVMContext &Ctx = CGM.getLLVMContext(); 1868 1869 // Get "nvvm.annotations" metadata node 1870 llvm::NamedMDNode *MD = M.getOrInsertNamedMetadata("nvvm.annotations"); 1871 1872 llvm::Metadata *MDVals[] = { 1873 llvm::ConstantAsMetadata::get(Addr), llvm::MDString::get(Ctx, "kernel"), 1874 llvm::ConstantAsMetadata::get( 1875 llvm::ConstantInt::get(llvm::Type::getInt32Ty(Ctx), 1))}; 1876 // Append metadata to nvvm.annotations 1877 MD->addOperand(llvm::MDNode::get(Ctx, MDVals)); 1878 } 1879 1880 void CGOpenMPRuntimeGPU::emitTargetOutlinedFunction( 1881 const OMPExecutableDirective &D, StringRef ParentName, 1882 llvm::Function *&OutlinedFn, llvm::Constant *&OutlinedFnID, 1883 bool IsOffloadEntry, const RegionCodeGenTy &CodeGen) { 1884 if (!IsOffloadEntry) // Nothing to do. 1885 return; 1886 1887 assert(!ParentName.empty() && "Invalid target region parent name!"); 1888 1889 bool Mode = supportsSPMDExecutionMode(CGM.getContext(), D); 1890 if (Mode) 1891 emitSPMDKernel(D, ParentName, OutlinedFn, OutlinedFnID, IsOffloadEntry, 1892 CodeGen); 1893 else 1894 emitNonSPMDKernel(D, ParentName, OutlinedFn, OutlinedFnID, IsOffloadEntry, 1895 CodeGen); 1896 1897 setPropertyExecutionMode(CGM, OutlinedFn->getName(), Mode); 1898 } 1899 1900 namespace { 1901 LLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE(); 1902 /// Enum for accesseing the reserved_2 field of the ident_t struct. 1903 enum ModeFlagsTy : unsigned { 1904 /// Bit set to 1 when in SPMD mode. 1905 KMP_IDENT_SPMD_MODE = 0x01, 1906 /// Bit set to 1 when a simplified runtime is used. 1907 KMP_IDENT_SIMPLE_RT_MODE = 0x02, 1908 LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue=*/KMP_IDENT_SIMPLE_RT_MODE) 1909 }; 1910 1911 /// Special mode Undefined. Is the combination of Non-SPMD mode + SimpleRuntime. 1912 static const ModeFlagsTy UndefinedMode = 1913 (~KMP_IDENT_SPMD_MODE) & KMP_IDENT_SIMPLE_RT_MODE; 1914 } // anonymous namespace 1915 1916 unsigned CGOpenMPRuntimeGPU::getDefaultLocationReserved2Flags() const { 1917 switch (getExecutionMode()) { 1918 case EM_SPMD: 1919 if (requiresFullRuntime()) 1920 return KMP_IDENT_SPMD_MODE & (~KMP_IDENT_SIMPLE_RT_MODE); 1921 return KMP_IDENT_SPMD_MODE | KMP_IDENT_SIMPLE_RT_MODE; 1922 case EM_NonSPMD: 1923 assert(requiresFullRuntime() && "Expected full runtime."); 1924 return (~KMP_IDENT_SPMD_MODE) & (~KMP_IDENT_SIMPLE_RT_MODE); 1925 case EM_Unknown: 1926 return UndefinedMode; 1927 } 1928 llvm_unreachable("Unknown flags are requested."); 1929 } 1930 1931 CGOpenMPRuntimeGPU::CGOpenMPRuntimeGPU(CodeGenModule &CGM) 1932 : CGOpenMPRuntime(CGM, "_", "$") { 1933 if (!CGM.getLangOpts().OpenMPIsDevice) 1934 llvm_unreachable("OpenMP NVPTX can only handle device code."); 1935 } 1936 1937 void CGOpenMPRuntimeGPU::emitProcBindClause(CodeGenFunction &CGF, 1938 ProcBindKind ProcBind, 1939 SourceLocation Loc) { 1940 // Do nothing in case of SPMD mode and L0 parallel. 1941 if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) 1942 return; 1943 1944 CGOpenMPRuntime::emitProcBindClause(CGF, ProcBind, Loc); 1945 } 1946 1947 void CGOpenMPRuntimeGPU::emitNumThreadsClause(CodeGenFunction &CGF, 1948 llvm::Value *NumThreads, 1949 SourceLocation Loc) { 1950 // Do nothing in case of SPMD mode and L0 parallel. 1951 if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) 1952 return; 1953 1954 CGOpenMPRuntime::emitNumThreadsClause(CGF, NumThreads, Loc); 1955 } 1956 1957 void CGOpenMPRuntimeGPU::emitNumTeamsClause(CodeGenFunction &CGF, 1958 const Expr *NumTeams, 1959 const Expr *ThreadLimit, 1960 SourceLocation Loc) {} 1961 1962 llvm::Function *CGOpenMPRuntimeGPU::emitParallelOutlinedFunction( 1963 const OMPExecutableDirective &D, const VarDecl *ThreadIDVar, 1964 OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen) { 1965 // Emit target region as a standalone region. 1966 class NVPTXPrePostActionTy : public PrePostActionTy { 1967 bool &IsInParallelRegion; 1968 bool PrevIsInParallelRegion; 1969 1970 public: 1971 NVPTXPrePostActionTy(bool &IsInParallelRegion) 1972 : IsInParallelRegion(IsInParallelRegion) {} 1973 void Enter(CodeGenFunction &CGF) override { 1974 PrevIsInParallelRegion = IsInParallelRegion; 1975 IsInParallelRegion = true; 1976 } 1977 void Exit(CodeGenFunction &CGF) override { 1978 IsInParallelRegion = PrevIsInParallelRegion; 1979 } 1980 } Action(IsInParallelRegion); 1981 CodeGen.setAction(Action); 1982 bool PrevIsInTTDRegion = IsInTTDRegion; 1983 IsInTTDRegion = false; 1984 bool PrevIsInTargetMasterThreadRegion = IsInTargetMasterThreadRegion; 1985 IsInTargetMasterThreadRegion = false; 1986 auto *OutlinedFun = 1987 cast<llvm::Function>(CGOpenMPRuntime::emitParallelOutlinedFunction( 1988 D, ThreadIDVar, InnermostKind, CodeGen)); 1989 if (CGM.getLangOpts().Optimize) { 1990 OutlinedFun->removeFnAttr(llvm::Attribute::NoInline); 1991 OutlinedFun->removeFnAttr(llvm::Attribute::OptimizeNone); 1992 OutlinedFun->addFnAttr(llvm::Attribute::AlwaysInline); 1993 } 1994 IsInTargetMasterThreadRegion = PrevIsInTargetMasterThreadRegion; 1995 IsInTTDRegion = PrevIsInTTDRegion; 1996 if (getExecutionMode() != CGOpenMPRuntimeGPU::EM_SPMD && 1997 !IsInParallelRegion) { 1998 llvm::Function *WrapperFun = 1999 createParallelDataSharingWrapper(OutlinedFun, D); 2000 WrapperFunctionsMap[OutlinedFun] = WrapperFun; 2001 } 2002 2003 return OutlinedFun; 2004 } 2005 2006 /// Get list of lastprivate variables from the teams distribute ... or 2007 /// teams {distribute ...} directives. 2008 static void 2009 getDistributeLastprivateVars(ASTContext &Ctx, const OMPExecutableDirective &D, 2010 llvm::SmallVectorImpl<const ValueDecl *> &Vars) { 2011 assert(isOpenMPTeamsDirective(D.getDirectiveKind()) && 2012 "expected teams directive."); 2013 const OMPExecutableDirective *Dir = &D; 2014 if (!isOpenMPDistributeDirective(D.getDirectiveKind())) { 2015 if (const Stmt *S = CGOpenMPRuntime::getSingleCompoundChild( 2016 Ctx, 2017 D.getInnermostCapturedStmt()->getCapturedStmt()->IgnoreContainers( 2018 /*IgnoreCaptured=*/true))) { 2019 Dir = dyn_cast_or_null<OMPExecutableDirective>(S); 2020 if (Dir && !isOpenMPDistributeDirective(Dir->getDirectiveKind())) 2021 Dir = nullptr; 2022 } 2023 } 2024 if (!Dir) 2025 return; 2026 for (const auto *C : Dir->getClausesOfKind<OMPLastprivateClause>()) { 2027 for (const Expr *E : C->getVarRefs()) 2028 Vars.push_back(getPrivateItem(E)); 2029 } 2030 } 2031 2032 /// Get list of reduction variables from the teams ... directives. 2033 static void 2034 getTeamsReductionVars(ASTContext &Ctx, const OMPExecutableDirective &D, 2035 llvm::SmallVectorImpl<const ValueDecl *> &Vars) { 2036 assert(isOpenMPTeamsDirective(D.getDirectiveKind()) && 2037 "expected teams directive."); 2038 for (const auto *C : D.getClausesOfKind<OMPReductionClause>()) { 2039 for (const Expr *E : C->privates()) 2040 Vars.push_back(getPrivateItem(E)); 2041 } 2042 } 2043 2044 llvm::Function *CGOpenMPRuntimeGPU::emitTeamsOutlinedFunction( 2045 const OMPExecutableDirective &D, const VarDecl *ThreadIDVar, 2046 OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen) { 2047 SourceLocation Loc = D.getBeginLoc(); 2048 2049 const RecordDecl *GlobalizedRD = nullptr; 2050 llvm::SmallVector<const ValueDecl *, 4> LastPrivatesReductions; 2051 llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> MappedDeclsFields; 2052 unsigned WarpSize = CGM.getTarget().getGridValue(llvm::omp::GV_Warp_Size); 2053 // Globalize team reductions variable unconditionally in all modes. 2054 if (getExecutionMode() != CGOpenMPRuntimeGPU::EM_SPMD) 2055 getTeamsReductionVars(CGM.getContext(), D, LastPrivatesReductions); 2056 if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) { 2057 getDistributeLastprivateVars(CGM.getContext(), D, LastPrivatesReductions); 2058 if (!LastPrivatesReductions.empty()) { 2059 GlobalizedRD = ::buildRecordForGlobalizedVars( 2060 CGM.getContext(), llvm::None, LastPrivatesReductions, 2061 MappedDeclsFields, WarpSize); 2062 } 2063 } else if (!LastPrivatesReductions.empty()) { 2064 assert(!TeamAndReductions.first && 2065 "Previous team declaration is not expected."); 2066 TeamAndReductions.first = D.getCapturedStmt(OMPD_teams)->getCapturedDecl(); 2067 std::swap(TeamAndReductions.second, LastPrivatesReductions); 2068 } 2069 2070 // Emit target region as a standalone region. 2071 class NVPTXPrePostActionTy : public PrePostActionTy { 2072 SourceLocation &Loc; 2073 const RecordDecl *GlobalizedRD; 2074 llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> 2075 &MappedDeclsFields; 2076 2077 public: 2078 NVPTXPrePostActionTy( 2079 SourceLocation &Loc, const RecordDecl *GlobalizedRD, 2080 llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> 2081 &MappedDeclsFields) 2082 : Loc(Loc), GlobalizedRD(GlobalizedRD), 2083 MappedDeclsFields(MappedDeclsFields) {} 2084 void Enter(CodeGenFunction &CGF) override { 2085 auto &Rt = 2086 static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); 2087 if (GlobalizedRD) { 2088 auto I = Rt.FunctionGlobalizedDecls.try_emplace(CGF.CurFn).first; 2089 I->getSecond().GlobalRecord = GlobalizedRD; 2090 I->getSecond().MappedParams = 2091 std::make_unique<CodeGenFunction::OMPMapVars>(); 2092 DeclToAddrMapTy &Data = I->getSecond().LocalVarData; 2093 for (const auto &Pair : MappedDeclsFields) { 2094 assert(Pair.getFirst()->isCanonicalDecl() && 2095 "Expected canonical declaration"); 2096 Data.insert(std::make_pair(Pair.getFirst(), 2097 MappedVarData(Pair.getSecond(), 2098 /*IsOnePerTeam=*/true))); 2099 } 2100 } 2101 Rt.emitGenericVarsProlog(CGF, Loc); 2102 } 2103 void Exit(CodeGenFunction &CGF) override { 2104 static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()) 2105 .emitGenericVarsEpilog(CGF); 2106 } 2107 } Action(Loc, GlobalizedRD, MappedDeclsFields); 2108 CodeGen.setAction(Action); 2109 llvm::Function *OutlinedFun = CGOpenMPRuntime::emitTeamsOutlinedFunction( 2110 D, ThreadIDVar, InnermostKind, CodeGen); 2111 if (CGM.getLangOpts().Optimize) { 2112 OutlinedFun->removeFnAttr(llvm::Attribute::NoInline); 2113 OutlinedFun->removeFnAttr(llvm::Attribute::OptimizeNone); 2114 OutlinedFun->addFnAttr(llvm::Attribute::AlwaysInline); 2115 } 2116 2117 return OutlinedFun; 2118 } 2119 2120 void CGOpenMPRuntimeGPU::emitGenericVarsProlog(CodeGenFunction &CGF, 2121 SourceLocation Loc, 2122 bool WithSPMDCheck) { 2123 if (getDataSharingMode(CGM) != CGOpenMPRuntimeGPU::Generic && 2124 getExecutionMode() != CGOpenMPRuntimeGPU::EM_SPMD) 2125 return; 2126 2127 CGBuilderTy &Bld = CGF.Builder; 2128 2129 const auto I = FunctionGlobalizedDecls.find(CGF.CurFn); 2130 if (I == FunctionGlobalizedDecls.end()) 2131 return; 2132 if (const RecordDecl *GlobalizedVarsRecord = I->getSecond().GlobalRecord) { 2133 QualType GlobalRecTy = CGM.getContext().getRecordType(GlobalizedVarsRecord); 2134 QualType SecGlobalRecTy; 2135 2136 // Recover pointer to this function's global record. The runtime will 2137 // handle the specifics of the allocation of the memory. 2138 // Use actual memory size of the record including the padding 2139 // for alignment purposes. 2140 unsigned Alignment = 2141 CGM.getContext().getTypeAlignInChars(GlobalRecTy).getQuantity(); 2142 unsigned GlobalRecordSize = 2143 CGM.getContext().getTypeSizeInChars(GlobalRecTy).getQuantity(); 2144 GlobalRecordSize = llvm::alignTo(GlobalRecordSize, Alignment); 2145 2146 llvm::PointerType *GlobalRecPtrTy = 2147 CGF.ConvertTypeForMem(GlobalRecTy)->getPointerTo(); 2148 llvm::Value *GlobalRecCastAddr; 2149 llvm::Value *IsTTD = nullptr; 2150 if (!IsInTTDRegion && 2151 (WithSPMDCheck || 2152 getExecutionMode() == CGOpenMPRuntimeGPU::EM_Unknown)) { 2153 llvm::BasicBlock *ExitBB = CGF.createBasicBlock(".exit"); 2154 llvm::BasicBlock *SPMDBB = CGF.createBasicBlock(".spmd"); 2155 llvm::BasicBlock *NonSPMDBB = CGF.createBasicBlock(".non-spmd"); 2156 if (I->getSecond().SecondaryGlobalRecord.hasValue()) { 2157 llvm::Value *RTLoc = emitUpdateLocation(CGF, Loc); 2158 llvm::Value *ThreadID = getThreadID(CGF, Loc); 2159 llvm::Value *PL = CGF.EmitRuntimeCall( 2160 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_parallel_level), 2161 {RTLoc, ThreadID}); 2162 IsTTD = Bld.CreateIsNull(PL); 2163 } 2164 llvm::Value *IsSPMD = Bld.CreateIsNotNull(CGF.EmitNounwindRuntimeCall( 2165 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_is_spmd_exec_mode))); 2166 Bld.CreateCondBr(IsSPMD, SPMDBB, NonSPMDBB); 2167 // There is no need to emit line number for unconditional branch. 2168 (void)ApplyDebugLocation::CreateEmpty(CGF); 2169 CGF.EmitBlock(SPMDBB); 2170 Address RecPtr = Address(llvm::ConstantPointerNull::get(GlobalRecPtrTy), 2171 CharUnits::fromQuantity(Alignment)); 2172 CGF.EmitBranch(ExitBB); 2173 // There is no need to emit line number for unconditional branch. 2174 (void)ApplyDebugLocation::CreateEmpty(CGF); 2175 CGF.EmitBlock(NonSPMDBB); 2176 llvm::Value *Size = llvm::ConstantInt::get(CGM.SizeTy, GlobalRecordSize); 2177 if (const RecordDecl *SecGlobalizedVarsRecord = 2178 I->getSecond().SecondaryGlobalRecord.getValueOr(nullptr)) { 2179 SecGlobalRecTy = 2180 CGM.getContext().getRecordType(SecGlobalizedVarsRecord); 2181 2182 // Recover pointer to this function's global record. The runtime will 2183 // handle the specifics of the allocation of the memory. 2184 // Use actual memory size of the record including the padding 2185 // for alignment purposes. 2186 unsigned Alignment = 2187 CGM.getContext().getTypeAlignInChars(SecGlobalRecTy).getQuantity(); 2188 unsigned GlobalRecordSize = 2189 CGM.getContext().getTypeSizeInChars(SecGlobalRecTy).getQuantity(); 2190 GlobalRecordSize = llvm::alignTo(GlobalRecordSize, Alignment); 2191 Size = Bld.CreateSelect( 2192 IsTTD, llvm::ConstantInt::get(CGM.SizeTy, GlobalRecordSize), Size); 2193 } 2194 // TODO: allow the usage of shared memory to be controlled by 2195 // the user, for now, default to global. 2196 llvm::Value *GlobalRecordSizeArg[] = { 2197 Size, CGF.Builder.getInt16(/*UseSharedMemory=*/0)}; 2198 llvm::Value *GlobalRecValue = CGF.EmitRuntimeCall( 2199 createNVPTXRuntimeFunction( 2200 OMPRTL_NVPTX__kmpc_data_sharing_coalesced_push_stack), 2201 GlobalRecordSizeArg); 2202 GlobalRecCastAddr = Bld.CreatePointerBitCastOrAddrSpaceCast( 2203 GlobalRecValue, GlobalRecPtrTy); 2204 CGF.EmitBlock(ExitBB); 2205 auto *Phi = Bld.CreatePHI(GlobalRecPtrTy, 2206 /*NumReservedValues=*/2, "_select_stack"); 2207 Phi->addIncoming(RecPtr.getPointer(), SPMDBB); 2208 Phi->addIncoming(GlobalRecCastAddr, NonSPMDBB); 2209 GlobalRecCastAddr = Phi; 2210 I->getSecond().GlobalRecordAddr = Phi; 2211 I->getSecond().IsInSPMDModeFlag = IsSPMD; 2212 } else if (!CGM.getLangOpts().OpenMPCUDATargetParallel && IsInTTDRegion) { 2213 assert(GlobalizedRecords.back().Records.size() < 2 && 2214 "Expected less than 2 globalized records: one for target and one " 2215 "for teams."); 2216 unsigned Offset = 0; 2217 for (const RecordDecl *RD : GlobalizedRecords.back().Records) { 2218 QualType RDTy = CGM.getContext().getRecordType(RD); 2219 unsigned Alignment = 2220 CGM.getContext().getTypeAlignInChars(RDTy).getQuantity(); 2221 unsigned Size = CGM.getContext().getTypeSizeInChars(RDTy).getQuantity(); 2222 Offset = 2223 llvm::alignTo(llvm::alignTo(Offset, Alignment) + Size, Alignment); 2224 } 2225 unsigned Alignment = 2226 CGM.getContext().getTypeAlignInChars(GlobalRecTy).getQuantity(); 2227 Offset = llvm::alignTo(Offset, Alignment); 2228 GlobalizedRecords.back().Records.push_back(GlobalizedVarsRecord); 2229 ++GlobalizedRecords.back().RegionCounter; 2230 if (GlobalizedRecords.back().Records.size() == 1) { 2231 assert(KernelStaticGlobalized && 2232 "Kernel static pointer must be initialized already."); 2233 auto *UseSharedMemory = new llvm::GlobalVariable( 2234 CGM.getModule(), CGM.Int16Ty, /*isConstant=*/true, 2235 llvm::GlobalValue::InternalLinkage, nullptr, 2236 "_openmp_static_kernel$is_shared"); 2237 UseSharedMemory->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global); 2238 QualType Int16Ty = CGM.getContext().getIntTypeForBitwidth( 2239 /*DestWidth=*/16, /*Signed=*/0); 2240 llvm::Value *IsInSharedMemory = CGF.EmitLoadOfScalar( 2241 Address(UseSharedMemory, 2242 CGM.getContext().getTypeAlignInChars(Int16Ty)), 2243 /*Volatile=*/false, Int16Ty, Loc); 2244 auto *StaticGlobalized = new llvm::GlobalVariable( 2245 CGM.getModule(), CGM.Int8Ty, /*isConstant=*/false, 2246 llvm::GlobalValue::CommonLinkage, nullptr); 2247 auto *RecSize = new llvm::GlobalVariable( 2248 CGM.getModule(), CGM.SizeTy, /*isConstant=*/true, 2249 llvm::GlobalValue::InternalLinkage, nullptr, 2250 "_openmp_static_kernel$size"); 2251 RecSize->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global); 2252 llvm::Value *Ld = CGF.EmitLoadOfScalar( 2253 Address(RecSize, CGM.getSizeAlign()), /*Volatile=*/false, 2254 CGM.getContext().getSizeType(), Loc); 2255 llvm::Value *ResAddr = Bld.CreatePointerBitCastOrAddrSpaceCast( 2256 KernelStaticGlobalized, CGM.VoidPtrPtrTy); 2257 llvm::Value *GlobalRecordSizeArg[] = { 2258 llvm::ConstantInt::get( 2259 CGM.Int16Ty, 2260 getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD ? 1 : 0), 2261 StaticGlobalized, Ld, IsInSharedMemory, ResAddr}; 2262 CGF.EmitRuntimeCall(createNVPTXRuntimeFunction( 2263 OMPRTL_NVPTX__kmpc_get_team_static_memory), 2264 GlobalRecordSizeArg); 2265 GlobalizedRecords.back().Buffer = StaticGlobalized; 2266 GlobalizedRecords.back().RecSize = RecSize; 2267 GlobalizedRecords.back().UseSharedMemory = UseSharedMemory; 2268 GlobalizedRecords.back().Loc = Loc; 2269 } 2270 assert(KernelStaticGlobalized && "Global address must be set already."); 2271 Address FrameAddr = CGF.EmitLoadOfPointer( 2272 Address(KernelStaticGlobalized, CGM.getPointerAlign()), 2273 CGM.getContext() 2274 .getPointerType(CGM.getContext().VoidPtrTy) 2275 .castAs<PointerType>()); 2276 llvm::Value *GlobalRecValue = 2277 Bld.CreateConstInBoundsGEP(FrameAddr, Offset).getPointer(); 2278 I->getSecond().GlobalRecordAddr = GlobalRecValue; 2279 I->getSecond().IsInSPMDModeFlag = nullptr; 2280 GlobalRecCastAddr = Bld.CreatePointerBitCastOrAddrSpaceCast( 2281 GlobalRecValue, CGF.ConvertTypeForMem(GlobalRecTy)->getPointerTo()); 2282 } else { 2283 // TODO: allow the usage of shared memory to be controlled by 2284 // the user, for now, default to global. 2285 bool UseSharedMemory = 2286 IsInTTDRegion && GlobalRecordSize <= SharedMemorySize; 2287 llvm::Value *GlobalRecordSizeArg[] = { 2288 llvm::ConstantInt::get(CGM.SizeTy, GlobalRecordSize), 2289 CGF.Builder.getInt16(UseSharedMemory ? 1 : 0)}; 2290 llvm::Value *GlobalRecValue = CGF.EmitRuntimeCall( 2291 createNVPTXRuntimeFunction( 2292 IsInTTDRegion 2293 ? OMPRTL_NVPTX__kmpc_data_sharing_push_stack 2294 : OMPRTL_NVPTX__kmpc_data_sharing_coalesced_push_stack), 2295 GlobalRecordSizeArg); 2296 GlobalRecCastAddr = Bld.CreatePointerBitCastOrAddrSpaceCast( 2297 GlobalRecValue, GlobalRecPtrTy); 2298 I->getSecond().GlobalRecordAddr = GlobalRecValue; 2299 I->getSecond().IsInSPMDModeFlag = nullptr; 2300 } 2301 LValue Base = 2302 CGF.MakeNaturalAlignPointeeAddrLValue(GlobalRecCastAddr, GlobalRecTy); 2303 2304 // Emit the "global alloca" which is a GEP from the global declaration 2305 // record using the pointer returned by the runtime. 2306 LValue SecBase; 2307 decltype(I->getSecond().LocalVarData)::const_iterator SecIt; 2308 if (IsTTD) { 2309 SecIt = I->getSecond().SecondaryLocalVarData->begin(); 2310 llvm::PointerType *SecGlobalRecPtrTy = 2311 CGF.ConvertTypeForMem(SecGlobalRecTy)->getPointerTo(); 2312 SecBase = CGF.MakeNaturalAlignPointeeAddrLValue( 2313 Bld.CreatePointerBitCastOrAddrSpaceCast( 2314 I->getSecond().GlobalRecordAddr, SecGlobalRecPtrTy), 2315 SecGlobalRecTy); 2316 } 2317 for (auto &Rec : I->getSecond().LocalVarData) { 2318 bool EscapedParam = I->getSecond().EscapedParameters.count(Rec.first); 2319 llvm::Value *ParValue; 2320 if (EscapedParam) { 2321 const auto *VD = cast<VarDecl>(Rec.first); 2322 LValue ParLVal = 2323 CGF.MakeAddrLValue(CGF.GetAddrOfLocalVar(VD), VD->getType()); 2324 ParValue = CGF.EmitLoadOfScalar(ParLVal, Loc); 2325 } 2326 LValue VarAddr = CGF.EmitLValueForField(Base, Rec.second.FD); 2327 // Emit VarAddr basing on lane-id if required. 2328 QualType VarTy; 2329 if (Rec.second.IsOnePerTeam) { 2330 VarTy = Rec.second.FD->getType(); 2331 } else { 2332 llvm::Value *Ptr = CGF.Builder.CreateInBoundsGEP( 2333 VarAddr.getAddress(CGF).getPointer(), 2334 {Bld.getInt32(0), getNVPTXLaneID(CGF)}); 2335 VarTy = 2336 Rec.second.FD->getType()->castAsArrayTypeUnsafe()->getElementType(); 2337 VarAddr = CGF.MakeAddrLValue( 2338 Address(Ptr, CGM.getContext().getDeclAlign(Rec.first)), VarTy, 2339 AlignmentSource::Decl); 2340 } 2341 Rec.second.PrivateAddr = VarAddr.getAddress(CGF); 2342 if (!IsInTTDRegion && 2343 (WithSPMDCheck || 2344 getExecutionMode() == CGOpenMPRuntimeGPU::EM_Unknown)) { 2345 assert(I->getSecond().IsInSPMDModeFlag && 2346 "Expected unknown execution mode or required SPMD check."); 2347 if (IsTTD) { 2348 assert(SecIt->second.IsOnePerTeam && 2349 "Secondary glob data must be one per team."); 2350 LValue SecVarAddr = CGF.EmitLValueForField(SecBase, SecIt->second.FD); 2351 VarAddr.setAddress( 2352 Address(Bld.CreateSelect(IsTTD, SecVarAddr.getPointer(CGF), 2353 VarAddr.getPointer(CGF)), 2354 VarAddr.getAlignment())); 2355 Rec.second.PrivateAddr = VarAddr.getAddress(CGF); 2356 } 2357 Address GlobalPtr = Rec.second.PrivateAddr; 2358 Address LocalAddr = CGF.CreateMemTemp(VarTy, Rec.second.FD->getName()); 2359 Rec.second.PrivateAddr = Address( 2360 Bld.CreateSelect(I->getSecond().IsInSPMDModeFlag, 2361 LocalAddr.getPointer(), GlobalPtr.getPointer()), 2362 LocalAddr.getAlignment()); 2363 } 2364 if (EscapedParam) { 2365 const auto *VD = cast<VarDecl>(Rec.first); 2366 CGF.EmitStoreOfScalar(ParValue, VarAddr); 2367 I->getSecond().MappedParams->setVarAddr(CGF, VD, 2368 VarAddr.getAddress(CGF)); 2369 } 2370 if (IsTTD) 2371 ++SecIt; 2372 } 2373 } 2374 for (const ValueDecl *VD : I->getSecond().EscapedVariableLengthDecls) { 2375 // Recover pointer to this function's global record. The runtime will 2376 // handle the specifics of the allocation of the memory. 2377 // Use actual memory size of the record including the padding 2378 // for alignment purposes. 2379 CGBuilderTy &Bld = CGF.Builder; 2380 llvm::Value *Size = CGF.getTypeSize(VD->getType()); 2381 CharUnits Align = CGM.getContext().getDeclAlign(VD); 2382 Size = Bld.CreateNUWAdd( 2383 Size, llvm::ConstantInt::get(CGF.SizeTy, Align.getQuantity() - 1)); 2384 llvm::Value *AlignVal = 2385 llvm::ConstantInt::get(CGF.SizeTy, Align.getQuantity()); 2386 Size = Bld.CreateUDiv(Size, AlignVal); 2387 Size = Bld.CreateNUWMul(Size, AlignVal); 2388 // TODO: allow the usage of shared memory to be controlled by 2389 // the user, for now, default to global. 2390 llvm::Value *GlobalRecordSizeArg[] = { 2391 Size, CGF.Builder.getInt16(/*UseSharedMemory=*/0)}; 2392 llvm::Value *GlobalRecValue = CGF.EmitRuntimeCall( 2393 createNVPTXRuntimeFunction( 2394 OMPRTL_NVPTX__kmpc_data_sharing_coalesced_push_stack), 2395 GlobalRecordSizeArg); 2396 llvm::Value *GlobalRecCastAddr = Bld.CreatePointerBitCastOrAddrSpaceCast( 2397 GlobalRecValue, CGF.ConvertTypeForMem(VD->getType())->getPointerTo()); 2398 LValue Base = CGF.MakeAddrLValue(GlobalRecCastAddr, VD->getType(), 2399 CGM.getContext().getDeclAlign(VD), 2400 AlignmentSource::Decl); 2401 I->getSecond().MappedParams->setVarAddr(CGF, cast<VarDecl>(VD), 2402 Base.getAddress(CGF)); 2403 I->getSecond().EscapedVariableLengthDeclsAddrs.emplace_back(GlobalRecValue); 2404 } 2405 I->getSecond().MappedParams->apply(CGF); 2406 } 2407 2408 void CGOpenMPRuntimeGPU::emitGenericVarsEpilog(CodeGenFunction &CGF, 2409 bool WithSPMDCheck) { 2410 if (getDataSharingMode(CGM) != CGOpenMPRuntimeGPU::Generic && 2411 getExecutionMode() != CGOpenMPRuntimeGPU::EM_SPMD) 2412 return; 2413 2414 const auto I = FunctionGlobalizedDecls.find(CGF.CurFn); 2415 if (I != FunctionGlobalizedDecls.end()) { 2416 I->getSecond().MappedParams->restore(CGF); 2417 if (!CGF.HaveInsertPoint()) 2418 return; 2419 for (llvm::Value *Addr : 2420 llvm::reverse(I->getSecond().EscapedVariableLengthDeclsAddrs)) { 2421 CGF.EmitRuntimeCall( 2422 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_data_sharing_pop_stack), 2423 Addr); 2424 } 2425 if (I->getSecond().GlobalRecordAddr) { 2426 if (!IsInTTDRegion && 2427 (WithSPMDCheck || 2428 getExecutionMode() == CGOpenMPRuntimeGPU::EM_Unknown)) { 2429 CGBuilderTy &Bld = CGF.Builder; 2430 llvm::BasicBlock *ExitBB = CGF.createBasicBlock(".exit"); 2431 llvm::BasicBlock *NonSPMDBB = CGF.createBasicBlock(".non-spmd"); 2432 Bld.CreateCondBr(I->getSecond().IsInSPMDModeFlag, ExitBB, NonSPMDBB); 2433 // There is no need to emit line number for unconditional branch. 2434 (void)ApplyDebugLocation::CreateEmpty(CGF); 2435 CGF.EmitBlock(NonSPMDBB); 2436 CGF.EmitRuntimeCall( 2437 createNVPTXRuntimeFunction( 2438 OMPRTL_NVPTX__kmpc_data_sharing_pop_stack), 2439 CGF.EmitCastToVoidPtr(I->getSecond().GlobalRecordAddr)); 2440 CGF.EmitBlock(ExitBB); 2441 } else if (!CGM.getLangOpts().OpenMPCUDATargetParallel && IsInTTDRegion) { 2442 assert(GlobalizedRecords.back().RegionCounter > 0 && 2443 "region counter must be > 0."); 2444 --GlobalizedRecords.back().RegionCounter; 2445 // Emit the restore function only in the target region. 2446 if (GlobalizedRecords.back().RegionCounter == 0) { 2447 QualType Int16Ty = CGM.getContext().getIntTypeForBitwidth( 2448 /*DestWidth=*/16, /*Signed=*/0); 2449 llvm::Value *IsInSharedMemory = CGF.EmitLoadOfScalar( 2450 Address(GlobalizedRecords.back().UseSharedMemory, 2451 CGM.getContext().getTypeAlignInChars(Int16Ty)), 2452 /*Volatile=*/false, Int16Ty, GlobalizedRecords.back().Loc); 2453 llvm::Value *Args[] = { 2454 llvm::ConstantInt::get( 2455 CGM.Int16Ty, 2456 getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD ? 1 : 0), 2457 IsInSharedMemory}; 2458 CGF.EmitRuntimeCall( 2459 createNVPTXRuntimeFunction( 2460 OMPRTL_NVPTX__kmpc_restore_team_static_memory), 2461 Args); 2462 } 2463 } else { 2464 CGF.EmitRuntimeCall(createNVPTXRuntimeFunction( 2465 OMPRTL_NVPTX__kmpc_data_sharing_pop_stack), 2466 I->getSecond().GlobalRecordAddr); 2467 } 2468 } 2469 } 2470 } 2471 2472 void CGOpenMPRuntimeGPU::emitTeamsCall(CodeGenFunction &CGF, 2473 const OMPExecutableDirective &D, 2474 SourceLocation Loc, 2475 llvm::Function *OutlinedFn, 2476 ArrayRef<llvm::Value *> CapturedVars) { 2477 if (!CGF.HaveInsertPoint()) 2478 return; 2479 2480 Address ZeroAddr = CGF.CreateDefaultAlignTempAlloca(CGF.Int32Ty, 2481 /*Name=*/".zero.addr"); 2482 CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0)); 2483 llvm::SmallVector<llvm::Value *, 16> OutlinedFnArgs; 2484 OutlinedFnArgs.push_back(emitThreadIDAddress(CGF, Loc).getPointer()); 2485 OutlinedFnArgs.push_back(ZeroAddr.getPointer()); 2486 OutlinedFnArgs.append(CapturedVars.begin(), CapturedVars.end()); 2487 emitOutlinedFunctionCall(CGF, Loc, OutlinedFn, OutlinedFnArgs); 2488 } 2489 2490 void CGOpenMPRuntimeGPU::emitParallelCall( 2491 CodeGenFunction &CGF, SourceLocation Loc, llvm::Function *OutlinedFn, 2492 ArrayRef<llvm::Value *> CapturedVars, const Expr *IfCond) { 2493 if (!CGF.HaveInsertPoint()) 2494 return; 2495 2496 if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) 2497 emitSPMDParallelCall(CGF, Loc, OutlinedFn, CapturedVars, IfCond); 2498 else 2499 emitNonSPMDParallelCall(CGF, Loc, OutlinedFn, CapturedVars, IfCond); 2500 } 2501 2502 void CGOpenMPRuntimeGPU::emitNonSPMDParallelCall( 2503 CodeGenFunction &CGF, SourceLocation Loc, llvm::Value *OutlinedFn, 2504 ArrayRef<llvm::Value *> CapturedVars, const Expr *IfCond) { 2505 llvm::Function *Fn = cast<llvm::Function>(OutlinedFn); 2506 2507 // Force inline this outlined function at its call site. 2508 Fn->setLinkage(llvm::GlobalValue::InternalLinkage); 2509 2510 Address ZeroAddr = CGF.CreateDefaultAlignTempAlloca(CGF.Int32Ty, 2511 /*Name=*/".zero.addr"); 2512 CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0)); 2513 // ThreadId for serialized parallels is 0. 2514 Address ThreadIDAddr = ZeroAddr; 2515 auto &&CodeGen = [this, Fn, CapturedVars, Loc, &ThreadIDAddr]( 2516 CodeGenFunction &CGF, PrePostActionTy &Action) { 2517 Action.Enter(CGF); 2518 2519 Address ZeroAddr = 2520 CGF.CreateDefaultAlignTempAlloca(CGF.Int32Ty, 2521 /*Name=*/".bound.zero.addr"); 2522 CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0)); 2523 llvm::SmallVector<llvm::Value *, 16> OutlinedFnArgs; 2524 OutlinedFnArgs.push_back(ThreadIDAddr.getPointer()); 2525 OutlinedFnArgs.push_back(ZeroAddr.getPointer()); 2526 OutlinedFnArgs.append(CapturedVars.begin(), CapturedVars.end()); 2527 emitOutlinedFunctionCall(CGF, Loc, Fn, OutlinedFnArgs); 2528 }; 2529 auto &&SeqGen = [this, &CodeGen, Loc](CodeGenFunction &CGF, 2530 PrePostActionTy &) { 2531 2532 RegionCodeGenTy RCG(CodeGen); 2533 llvm::Value *RTLoc = emitUpdateLocation(CGF, Loc); 2534 llvm::Value *ThreadID = getThreadID(CGF, Loc); 2535 llvm::Value *Args[] = {RTLoc, ThreadID}; 2536 2537 NVPTXActionTy Action( 2538 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_serialized_parallel), 2539 Args, 2540 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_end_serialized_parallel), 2541 Args); 2542 RCG.setAction(Action); 2543 RCG(CGF); 2544 }; 2545 2546 auto &&L0ParallelGen = [this, CapturedVars, Fn](CodeGenFunction &CGF, 2547 PrePostActionTy &Action) { 2548 CGBuilderTy &Bld = CGF.Builder; 2549 llvm::Function *WFn = WrapperFunctionsMap[Fn]; 2550 assert(WFn && "Wrapper function does not exist!"); 2551 llvm::Value *ID = Bld.CreateBitOrPointerCast(WFn, CGM.Int8PtrTy); 2552 2553 // Prepare for parallel region. Indicate the outlined function. 2554 llvm::Value *Args[] = {ID}; 2555 CGF.EmitRuntimeCall( 2556 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_kernel_prepare_parallel), 2557 Args); 2558 2559 // Create a private scope that will globalize the arguments 2560 // passed from the outside of the target region. 2561 CodeGenFunction::OMPPrivateScope PrivateArgScope(CGF); 2562 2563 // There's something to share. 2564 if (!CapturedVars.empty()) { 2565 // Prepare for parallel region. Indicate the outlined function. 2566 Address SharedArgs = 2567 CGF.CreateDefaultAlignTempAlloca(CGF.VoidPtrPtrTy, "shared_arg_refs"); 2568 llvm::Value *SharedArgsPtr = SharedArgs.getPointer(); 2569 2570 llvm::Value *DataSharingArgs[] = { 2571 SharedArgsPtr, 2572 llvm::ConstantInt::get(CGM.SizeTy, CapturedVars.size())}; 2573 CGF.EmitRuntimeCall(createNVPTXRuntimeFunction( 2574 OMPRTL_NVPTX__kmpc_begin_sharing_variables), 2575 DataSharingArgs); 2576 2577 // Store variable address in a list of references to pass to workers. 2578 unsigned Idx = 0; 2579 ASTContext &Ctx = CGF.getContext(); 2580 Address SharedArgListAddress = CGF.EmitLoadOfPointer( 2581 SharedArgs, Ctx.getPointerType(Ctx.getPointerType(Ctx.VoidPtrTy)) 2582 .castAs<PointerType>()); 2583 for (llvm::Value *V : CapturedVars) { 2584 Address Dst = Bld.CreateConstInBoundsGEP(SharedArgListAddress, Idx); 2585 llvm::Value *PtrV; 2586 if (V->getType()->isIntegerTy()) 2587 PtrV = Bld.CreateIntToPtr(V, CGF.VoidPtrTy); 2588 else 2589 PtrV = Bld.CreatePointerBitCastOrAddrSpaceCast(V, CGF.VoidPtrTy); 2590 CGF.EmitStoreOfScalar(PtrV, Dst, /*Volatile=*/false, 2591 Ctx.getPointerType(Ctx.VoidPtrTy)); 2592 ++Idx; 2593 } 2594 } 2595 2596 // Activate workers. This barrier is used by the master to signal 2597 // work for the workers. 2598 syncCTAThreads(CGF); 2599 2600 // OpenMP [2.5, Parallel Construct, p.49] 2601 // There is an implied barrier at the end of a parallel region. After the 2602 // end of a parallel region, only the master thread of the team resumes 2603 // execution of the enclosing task region. 2604 // 2605 // The master waits at this barrier until all workers are done. 2606 syncCTAThreads(CGF); 2607 2608 if (!CapturedVars.empty()) 2609 CGF.EmitRuntimeCall( 2610 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_end_sharing_variables)); 2611 2612 // Remember for post-processing in worker loop. 2613 Work.emplace_back(WFn); 2614 }; 2615 2616 auto &&LNParallelGen = [this, Loc, &SeqGen, &L0ParallelGen]( 2617 CodeGenFunction &CGF, PrePostActionTy &Action) { 2618 if (IsInParallelRegion) { 2619 SeqGen(CGF, Action); 2620 } else if (IsInTargetMasterThreadRegion) { 2621 L0ParallelGen(CGF, Action); 2622 } else { 2623 // Check for master and then parallelism: 2624 // if (__kmpc_is_spmd_exec_mode() || __kmpc_parallel_level(loc, gtid)) { 2625 // Serialized execution. 2626 // } else { 2627 // Worker call. 2628 // } 2629 CGBuilderTy &Bld = CGF.Builder; 2630 llvm::BasicBlock *ExitBB = CGF.createBasicBlock(".exit"); 2631 llvm::BasicBlock *SeqBB = CGF.createBasicBlock(".sequential"); 2632 llvm::BasicBlock *ParallelCheckBB = CGF.createBasicBlock(".parcheck"); 2633 llvm::BasicBlock *MasterBB = CGF.createBasicBlock(".master"); 2634 llvm::Value *IsSPMD = Bld.CreateIsNotNull(CGF.EmitNounwindRuntimeCall( 2635 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_is_spmd_exec_mode))); 2636 Bld.CreateCondBr(IsSPMD, SeqBB, ParallelCheckBB); 2637 // There is no need to emit line number for unconditional branch. 2638 (void)ApplyDebugLocation::CreateEmpty(CGF); 2639 CGF.EmitBlock(ParallelCheckBB); 2640 llvm::Value *RTLoc = emitUpdateLocation(CGF, Loc); 2641 llvm::Value *ThreadID = getThreadID(CGF, Loc); 2642 llvm::Value *PL = CGF.EmitRuntimeCall( 2643 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_parallel_level), 2644 {RTLoc, ThreadID}); 2645 llvm::Value *Res = Bld.CreateIsNotNull(PL); 2646 Bld.CreateCondBr(Res, SeqBB, MasterBB); 2647 CGF.EmitBlock(SeqBB); 2648 SeqGen(CGF, Action); 2649 CGF.EmitBranch(ExitBB); 2650 // There is no need to emit line number for unconditional branch. 2651 (void)ApplyDebugLocation::CreateEmpty(CGF); 2652 CGF.EmitBlock(MasterBB); 2653 L0ParallelGen(CGF, Action); 2654 CGF.EmitBranch(ExitBB); 2655 // There is no need to emit line number for unconditional branch. 2656 (void)ApplyDebugLocation::CreateEmpty(CGF); 2657 // Emit the continuation block for code after the if. 2658 CGF.EmitBlock(ExitBB, /*IsFinished=*/true); 2659 } 2660 }; 2661 2662 if (IfCond) { 2663 emitIfClause(CGF, IfCond, LNParallelGen, SeqGen); 2664 } else { 2665 CodeGenFunction::RunCleanupsScope Scope(CGF); 2666 RegionCodeGenTy ThenRCG(LNParallelGen); 2667 ThenRCG(CGF); 2668 } 2669 } 2670 2671 void CGOpenMPRuntimeGPU::emitSPMDParallelCall( 2672 CodeGenFunction &CGF, SourceLocation Loc, llvm::Function *OutlinedFn, 2673 ArrayRef<llvm::Value *> CapturedVars, const Expr *IfCond) { 2674 // Just call the outlined function to execute the parallel region. 2675 // OutlinedFn(>id, &zero, CapturedStruct); 2676 // 2677 llvm::SmallVector<llvm::Value *, 16> OutlinedFnArgs; 2678 2679 Address ZeroAddr = CGF.CreateDefaultAlignTempAlloca(CGF.Int32Ty, 2680 /*Name=*/".zero.addr"); 2681 CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0)); 2682 // ThreadId for serialized parallels is 0. 2683 Address ThreadIDAddr = ZeroAddr; 2684 auto &&CodeGen = [this, OutlinedFn, CapturedVars, Loc, &ThreadIDAddr]( 2685 CodeGenFunction &CGF, PrePostActionTy &Action) { 2686 Action.Enter(CGF); 2687 2688 Address ZeroAddr = 2689 CGF.CreateDefaultAlignTempAlloca(CGF.Int32Ty, 2690 /*Name=*/".bound.zero.addr"); 2691 CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0)); 2692 llvm::SmallVector<llvm::Value *, 16> OutlinedFnArgs; 2693 OutlinedFnArgs.push_back(ThreadIDAddr.getPointer()); 2694 OutlinedFnArgs.push_back(ZeroAddr.getPointer()); 2695 OutlinedFnArgs.append(CapturedVars.begin(), CapturedVars.end()); 2696 emitOutlinedFunctionCall(CGF, Loc, OutlinedFn, OutlinedFnArgs); 2697 }; 2698 auto &&SeqGen = [this, &CodeGen, Loc](CodeGenFunction &CGF, 2699 PrePostActionTy &) { 2700 2701 RegionCodeGenTy RCG(CodeGen); 2702 llvm::Value *RTLoc = emitUpdateLocation(CGF, Loc); 2703 llvm::Value *ThreadID = getThreadID(CGF, Loc); 2704 llvm::Value *Args[] = {RTLoc, ThreadID}; 2705 2706 NVPTXActionTy Action( 2707 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_serialized_parallel), 2708 Args, 2709 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_end_serialized_parallel), 2710 Args); 2711 RCG.setAction(Action); 2712 RCG(CGF); 2713 }; 2714 2715 if (IsInTargetMasterThreadRegion) { 2716 // In the worker need to use the real thread id. 2717 ThreadIDAddr = emitThreadIDAddress(CGF, Loc); 2718 RegionCodeGenTy RCG(CodeGen); 2719 RCG(CGF); 2720 } else { 2721 // If we are not in the target region, it is definitely L2 parallelism or 2722 // more, because for SPMD mode we always has L1 parallel level, sowe don't 2723 // need to check for orphaned directives. 2724 RegionCodeGenTy RCG(SeqGen); 2725 RCG(CGF); 2726 } 2727 } 2728 2729 void CGOpenMPRuntimeGPU::syncCTAThreads(CodeGenFunction &CGF) { 2730 // Always emit simple barriers! 2731 if (!CGF.HaveInsertPoint()) 2732 return; 2733 // Build call __kmpc_barrier_simple_spmd(nullptr, 0); 2734 // This function does not use parameters, so we can emit just default values. 2735 llvm::Value *Args[] = { 2736 llvm::ConstantPointerNull::get( 2737 cast<llvm::PointerType>(getIdentTyPointerTy())), 2738 llvm::ConstantInt::get(CGF.Int32Ty, /*V=*/0, /*isSigned=*/true)}; 2739 llvm::CallInst *Call = CGF.EmitRuntimeCall( 2740 createNVPTXRuntimeFunction(OMPRTL__kmpc_barrier_simple_spmd), Args); 2741 Call->setConvergent(); 2742 } 2743 2744 void CGOpenMPRuntimeGPU::emitBarrierCall(CodeGenFunction &CGF, 2745 SourceLocation Loc, 2746 OpenMPDirectiveKind Kind, bool, 2747 bool) { 2748 // Always emit simple barriers! 2749 if (!CGF.HaveInsertPoint()) 2750 return; 2751 // Build call __kmpc_cancel_barrier(loc, thread_id); 2752 unsigned Flags = getDefaultFlagsForBarriers(Kind); 2753 llvm::Value *Args[] = {emitUpdateLocation(CGF, Loc, Flags), 2754 getThreadID(CGF, Loc)}; 2755 llvm::CallInst *Call = CGF.EmitRuntimeCall( 2756 createNVPTXRuntimeFunction(OMPRTL__kmpc_barrier), Args); 2757 Call->setConvergent(); 2758 } 2759 2760 void CGOpenMPRuntimeGPU::emitCriticalRegion( 2761 CodeGenFunction &CGF, StringRef CriticalName, 2762 const RegionCodeGenTy &CriticalOpGen, SourceLocation Loc, 2763 const Expr *Hint) { 2764 llvm::BasicBlock *LoopBB = CGF.createBasicBlock("omp.critical.loop"); 2765 llvm::BasicBlock *TestBB = CGF.createBasicBlock("omp.critical.test"); 2766 llvm::BasicBlock *SyncBB = CGF.createBasicBlock("omp.critical.sync"); 2767 llvm::BasicBlock *BodyBB = CGF.createBasicBlock("omp.critical.body"); 2768 llvm::BasicBlock *ExitBB = CGF.createBasicBlock("omp.critical.exit"); 2769 2770 auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); 2771 2772 // Get the mask of active threads in the warp. 2773 llvm::Value *Mask = CGF.EmitRuntimeCall( 2774 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_warp_active_thread_mask)); 2775 // Fetch team-local id of the thread. 2776 llvm::Value *ThreadID = RT.getGPUThreadID(CGF); 2777 2778 // Get the width of the team. 2779 llvm::Value *TeamWidth = RT.getGPUNumThreads(CGF); 2780 2781 // Initialize the counter variable for the loop. 2782 QualType Int32Ty = 2783 CGF.getContext().getIntTypeForBitwidth(/*DestWidth=*/32, /*Signed=*/0); 2784 Address Counter = CGF.CreateMemTemp(Int32Ty, "critical_counter"); 2785 LValue CounterLVal = CGF.MakeAddrLValue(Counter, Int32Ty); 2786 CGF.EmitStoreOfScalar(llvm::Constant::getNullValue(CGM.Int32Ty), CounterLVal, 2787 /*isInit=*/true); 2788 2789 // Block checks if loop counter exceeds upper bound. 2790 CGF.EmitBlock(LoopBB); 2791 llvm::Value *CounterVal = CGF.EmitLoadOfScalar(CounterLVal, Loc); 2792 llvm::Value *CmpLoopBound = CGF.Builder.CreateICmpSLT(CounterVal, TeamWidth); 2793 CGF.Builder.CreateCondBr(CmpLoopBound, TestBB, ExitBB); 2794 2795 // Block tests which single thread should execute region, and which threads 2796 // should go straight to synchronisation point. 2797 CGF.EmitBlock(TestBB); 2798 CounterVal = CGF.EmitLoadOfScalar(CounterLVal, Loc); 2799 llvm::Value *CmpThreadToCounter = 2800 CGF.Builder.CreateICmpEQ(ThreadID, CounterVal); 2801 CGF.Builder.CreateCondBr(CmpThreadToCounter, BodyBB, SyncBB); 2802 2803 // Block emits the body of the critical region. 2804 CGF.EmitBlock(BodyBB); 2805 2806 // Output the critical statement. 2807 CGOpenMPRuntime::emitCriticalRegion(CGF, CriticalName, CriticalOpGen, Loc, 2808 Hint); 2809 2810 // After the body surrounded by the critical region, the single executing 2811 // thread will jump to the synchronisation point. 2812 // Block waits for all threads in current team to finish then increments the 2813 // counter variable and returns to the loop. 2814 CGF.EmitBlock(SyncBB); 2815 // Reconverge active threads in the warp. 2816 (void)CGF.EmitRuntimeCall( 2817 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_syncwarp), Mask); 2818 2819 llvm::Value *IncCounterVal = 2820 CGF.Builder.CreateNSWAdd(CounterVal, CGF.Builder.getInt32(1)); 2821 CGF.EmitStoreOfScalar(IncCounterVal, CounterLVal); 2822 CGF.EmitBranch(LoopBB); 2823 2824 // Block that is reached when all threads in the team complete the region. 2825 CGF.EmitBlock(ExitBB, /*IsFinished=*/true); 2826 } 2827 2828 /// Cast value to the specified type. 2829 static llvm::Value *castValueToType(CodeGenFunction &CGF, llvm::Value *Val, 2830 QualType ValTy, QualType CastTy, 2831 SourceLocation Loc) { 2832 assert(!CGF.getContext().getTypeSizeInChars(CastTy).isZero() && 2833 "Cast type must sized."); 2834 assert(!CGF.getContext().getTypeSizeInChars(ValTy).isZero() && 2835 "Val type must sized."); 2836 llvm::Type *LLVMCastTy = CGF.ConvertTypeForMem(CastTy); 2837 if (ValTy == CastTy) 2838 return Val; 2839 if (CGF.getContext().getTypeSizeInChars(ValTy) == 2840 CGF.getContext().getTypeSizeInChars(CastTy)) 2841 return CGF.Builder.CreateBitCast(Val, LLVMCastTy); 2842 if (CastTy->isIntegerType() && ValTy->isIntegerType()) 2843 return CGF.Builder.CreateIntCast(Val, LLVMCastTy, 2844 CastTy->hasSignedIntegerRepresentation()); 2845 Address CastItem = CGF.CreateMemTemp(CastTy); 2846 Address ValCastItem = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( 2847 CastItem, Val->getType()->getPointerTo(CastItem.getAddressSpace())); 2848 CGF.EmitStoreOfScalar(Val, ValCastItem, /*Volatile=*/false, ValTy); 2849 return CGF.EmitLoadOfScalar(CastItem, /*Volatile=*/false, CastTy, Loc); 2850 } 2851 2852 /// This function creates calls to one of two shuffle functions to copy 2853 /// variables between lanes in a warp. 2854 static llvm::Value *createRuntimeShuffleFunction(CodeGenFunction &CGF, 2855 llvm::Value *Elem, 2856 QualType ElemType, 2857 llvm::Value *Offset, 2858 SourceLocation Loc) { 2859 CodeGenModule &CGM = CGF.CGM; 2860 CGBuilderTy &Bld = CGF.Builder; 2861 CGOpenMPRuntimeGPU &RT = 2862 *(static_cast<CGOpenMPRuntimeGPU *>(&CGM.getOpenMPRuntime())); 2863 2864 CharUnits Size = CGF.getContext().getTypeSizeInChars(ElemType); 2865 assert(Size.getQuantity() <= 8 && 2866 "Unsupported bitwidth in shuffle instruction."); 2867 2868 OpenMPRTLFunctionNVPTX ShuffleFn = Size.getQuantity() <= 4 2869 ? OMPRTL_NVPTX__kmpc_shuffle_int32 2870 : OMPRTL_NVPTX__kmpc_shuffle_int64; 2871 2872 // Cast all types to 32- or 64-bit values before calling shuffle routines. 2873 QualType CastTy = CGF.getContext().getIntTypeForBitwidth( 2874 Size.getQuantity() <= 4 ? 32 : 64, /*Signed=*/1); 2875 llvm::Value *ElemCast = castValueToType(CGF, Elem, ElemType, CastTy, Loc); 2876 llvm::Value *WarpSize = 2877 Bld.CreateIntCast(RT.getGPUWarpSize(CGF), CGM.Int16Ty, /*isSigned=*/true); 2878 2879 llvm::Value *ShuffledVal = CGF.EmitRuntimeCall( 2880 RT.createNVPTXRuntimeFunction(ShuffleFn), {ElemCast, Offset, WarpSize}); 2881 2882 return castValueToType(CGF, ShuffledVal, CastTy, ElemType, Loc); 2883 } 2884 2885 static void shuffleAndStore(CodeGenFunction &CGF, Address SrcAddr, 2886 Address DestAddr, QualType ElemType, 2887 llvm::Value *Offset, SourceLocation Loc) { 2888 CGBuilderTy &Bld = CGF.Builder; 2889 2890 CharUnits Size = CGF.getContext().getTypeSizeInChars(ElemType); 2891 // Create the loop over the big sized data. 2892 // ptr = (void*)Elem; 2893 // ptrEnd = (void*) Elem + 1; 2894 // Step = 8; 2895 // while (ptr + Step < ptrEnd) 2896 // shuffle((int64_t)*ptr); 2897 // Step = 4; 2898 // while (ptr + Step < ptrEnd) 2899 // shuffle((int32_t)*ptr); 2900 // ... 2901 Address ElemPtr = DestAddr; 2902 Address Ptr = SrcAddr; 2903 Address PtrEnd = Bld.CreatePointerBitCastOrAddrSpaceCast( 2904 Bld.CreateConstGEP(SrcAddr, 1), CGF.VoidPtrTy); 2905 for (int IntSize = 8; IntSize >= 1; IntSize /= 2) { 2906 if (Size < CharUnits::fromQuantity(IntSize)) 2907 continue; 2908 QualType IntType = CGF.getContext().getIntTypeForBitwidth( 2909 CGF.getContext().toBits(CharUnits::fromQuantity(IntSize)), 2910 /*Signed=*/1); 2911 llvm::Type *IntTy = CGF.ConvertTypeForMem(IntType); 2912 Ptr = Bld.CreatePointerBitCastOrAddrSpaceCast(Ptr, IntTy->getPointerTo()); 2913 ElemPtr = 2914 Bld.CreatePointerBitCastOrAddrSpaceCast(ElemPtr, IntTy->getPointerTo()); 2915 if (Size.getQuantity() / IntSize > 1) { 2916 llvm::BasicBlock *PreCondBB = CGF.createBasicBlock(".shuffle.pre_cond"); 2917 llvm::BasicBlock *ThenBB = CGF.createBasicBlock(".shuffle.then"); 2918 llvm::BasicBlock *ExitBB = CGF.createBasicBlock(".shuffle.exit"); 2919 llvm::BasicBlock *CurrentBB = Bld.GetInsertBlock(); 2920 CGF.EmitBlock(PreCondBB); 2921 llvm::PHINode *PhiSrc = 2922 Bld.CreatePHI(Ptr.getType(), /*NumReservedValues=*/2); 2923 PhiSrc->addIncoming(Ptr.getPointer(), CurrentBB); 2924 llvm::PHINode *PhiDest = 2925 Bld.CreatePHI(ElemPtr.getType(), /*NumReservedValues=*/2); 2926 PhiDest->addIncoming(ElemPtr.getPointer(), CurrentBB); 2927 Ptr = Address(PhiSrc, Ptr.getAlignment()); 2928 ElemPtr = Address(PhiDest, ElemPtr.getAlignment()); 2929 llvm::Value *PtrDiff = Bld.CreatePtrDiff( 2930 PtrEnd.getPointer(), Bld.CreatePointerBitCastOrAddrSpaceCast( 2931 Ptr.getPointer(), CGF.VoidPtrTy)); 2932 Bld.CreateCondBr(Bld.CreateICmpSGT(PtrDiff, Bld.getInt64(IntSize - 1)), 2933 ThenBB, ExitBB); 2934 CGF.EmitBlock(ThenBB); 2935 llvm::Value *Res = createRuntimeShuffleFunction( 2936 CGF, CGF.EmitLoadOfScalar(Ptr, /*Volatile=*/false, IntType, Loc), 2937 IntType, Offset, Loc); 2938 CGF.EmitStoreOfScalar(Res, ElemPtr, /*Volatile=*/false, IntType); 2939 Address LocalPtr = Bld.CreateConstGEP(Ptr, 1); 2940 Address LocalElemPtr = Bld.CreateConstGEP(ElemPtr, 1); 2941 PhiSrc->addIncoming(LocalPtr.getPointer(), ThenBB); 2942 PhiDest->addIncoming(LocalElemPtr.getPointer(), ThenBB); 2943 CGF.EmitBranch(PreCondBB); 2944 CGF.EmitBlock(ExitBB); 2945 } else { 2946 llvm::Value *Res = createRuntimeShuffleFunction( 2947 CGF, CGF.EmitLoadOfScalar(Ptr, /*Volatile=*/false, IntType, Loc), 2948 IntType, Offset, Loc); 2949 CGF.EmitStoreOfScalar(Res, ElemPtr, /*Volatile=*/false, IntType); 2950 Ptr = Bld.CreateConstGEP(Ptr, 1); 2951 ElemPtr = Bld.CreateConstGEP(ElemPtr, 1); 2952 } 2953 Size = Size % IntSize; 2954 } 2955 } 2956 2957 namespace { 2958 enum CopyAction : unsigned { 2959 // RemoteLaneToThread: Copy over a Reduce list from a remote lane in 2960 // the warp using shuffle instructions. 2961 RemoteLaneToThread, 2962 // ThreadCopy: Make a copy of a Reduce list on the thread's stack. 2963 ThreadCopy, 2964 // ThreadToScratchpad: Copy a team-reduced array to the scratchpad. 2965 ThreadToScratchpad, 2966 // ScratchpadToThread: Copy from a scratchpad array in global memory 2967 // containing team-reduced data to a thread's stack. 2968 ScratchpadToThread, 2969 }; 2970 } // namespace 2971 2972 struct CopyOptionsTy { 2973 llvm::Value *RemoteLaneOffset; 2974 llvm::Value *ScratchpadIndex; 2975 llvm::Value *ScratchpadWidth; 2976 }; 2977 2978 /// Emit instructions to copy a Reduce list, which contains partially 2979 /// aggregated values, in the specified direction. 2980 static void emitReductionListCopy( 2981 CopyAction Action, CodeGenFunction &CGF, QualType ReductionArrayTy, 2982 ArrayRef<const Expr *> Privates, Address SrcBase, Address DestBase, 2983 CopyOptionsTy CopyOptions = {nullptr, nullptr, nullptr}) { 2984 2985 CodeGenModule &CGM = CGF.CGM; 2986 ASTContext &C = CGM.getContext(); 2987 CGBuilderTy &Bld = CGF.Builder; 2988 2989 llvm::Value *RemoteLaneOffset = CopyOptions.RemoteLaneOffset; 2990 llvm::Value *ScratchpadIndex = CopyOptions.ScratchpadIndex; 2991 llvm::Value *ScratchpadWidth = CopyOptions.ScratchpadWidth; 2992 2993 // Iterates, element-by-element, through the source Reduce list and 2994 // make a copy. 2995 unsigned Idx = 0; 2996 unsigned Size = Privates.size(); 2997 for (const Expr *Private : Privates) { 2998 Address SrcElementAddr = Address::invalid(); 2999 Address DestElementAddr = Address::invalid(); 3000 Address DestElementPtrAddr = Address::invalid(); 3001 // Should we shuffle in an element from a remote lane? 3002 bool ShuffleInElement = false; 3003 // Set to true to update the pointer in the dest Reduce list to a 3004 // newly created element. 3005 bool UpdateDestListPtr = false; 3006 // Increment the src or dest pointer to the scratchpad, for each 3007 // new element. 3008 bool IncrScratchpadSrc = false; 3009 bool IncrScratchpadDest = false; 3010 3011 switch (Action) { 3012 case RemoteLaneToThread: { 3013 // Step 1.1: Get the address for the src element in the Reduce list. 3014 Address SrcElementPtrAddr = Bld.CreateConstArrayGEP(SrcBase, Idx); 3015 SrcElementAddr = CGF.EmitLoadOfPointer( 3016 SrcElementPtrAddr, 3017 C.getPointerType(Private->getType())->castAs<PointerType>()); 3018 3019 // Step 1.2: Create a temporary to store the element in the destination 3020 // Reduce list. 3021 DestElementPtrAddr = Bld.CreateConstArrayGEP(DestBase, Idx); 3022 DestElementAddr = 3023 CGF.CreateMemTemp(Private->getType(), ".omp.reduction.element"); 3024 ShuffleInElement = true; 3025 UpdateDestListPtr = true; 3026 break; 3027 } 3028 case ThreadCopy: { 3029 // Step 1.1: Get the address for the src element in the Reduce list. 3030 Address SrcElementPtrAddr = Bld.CreateConstArrayGEP(SrcBase, Idx); 3031 SrcElementAddr = CGF.EmitLoadOfPointer( 3032 SrcElementPtrAddr, 3033 C.getPointerType(Private->getType())->castAs<PointerType>()); 3034 3035 // Step 1.2: Get the address for dest element. The destination 3036 // element has already been created on the thread's stack. 3037 DestElementPtrAddr = Bld.CreateConstArrayGEP(DestBase, Idx); 3038 DestElementAddr = CGF.EmitLoadOfPointer( 3039 DestElementPtrAddr, 3040 C.getPointerType(Private->getType())->castAs<PointerType>()); 3041 break; 3042 } 3043 case ThreadToScratchpad: { 3044 // Step 1.1: Get the address for the src element in the Reduce list. 3045 Address SrcElementPtrAddr = Bld.CreateConstArrayGEP(SrcBase, Idx); 3046 SrcElementAddr = CGF.EmitLoadOfPointer( 3047 SrcElementPtrAddr, 3048 C.getPointerType(Private->getType())->castAs<PointerType>()); 3049 3050 // Step 1.2: Get the address for dest element: 3051 // address = base + index * ElementSizeInChars. 3052 llvm::Value *ElementSizeInChars = CGF.getTypeSize(Private->getType()); 3053 llvm::Value *CurrentOffset = 3054 Bld.CreateNUWMul(ElementSizeInChars, ScratchpadIndex); 3055 llvm::Value *ScratchPadElemAbsolutePtrVal = 3056 Bld.CreateNUWAdd(DestBase.getPointer(), CurrentOffset); 3057 ScratchPadElemAbsolutePtrVal = 3058 Bld.CreateIntToPtr(ScratchPadElemAbsolutePtrVal, CGF.VoidPtrTy); 3059 DestElementAddr = Address(ScratchPadElemAbsolutePtrVal, 3060 C.getTypeAlignInChars(Private->getType())); 3061 IncrScratchpadDest = true; 3062 break; 3063 } 3064 case ScratchpadToThread: { 3065 // Step 1.1: Get the address for the src element in the scratchpad. 3066 // address = base + index * ElementSizeInChars. 3067 llvm::Value *ElementSizeInChars = CGF.getTypeSize(Private->getType()); 3068 llvm::Value *CurrentOffset = 3069 Bld.CreateNUWMul(ElementSizeInChars, ScratchpadIndex); 3070 llvm::Value *ScratchPadElemAbsolutePtrVal = 3071 Bld.CreateNUWAdd(SrcBase.getPointer(), CurrentOffset); 3072 ScratchPadElemAbsolutePtrVal = 3073 Bld.CreateIntToPtr(ScratchPadElemAbsolutePtrVal, CGF.VoidPtrTy); 3074 SrcElementAddr = Address(ScratchPadElemAbsolutePtrVal, 3075 C.getTypeAlignInChars(Private->getType())); 3076 IncrScratchpadSrc = true; 3077 3078 // Step 1.2: Create a temporary to store the element in the destination 3079 // Reduce list. 3080 DestElementPtrAddr = Bld.CreateConstArrayGEP(DestBase, Idx); 3081 DestElementAddr = 3082 CGF.CreateMemTemp(Private->getType(), ".omp.reduction.element"); 3083 UpdateDestListPtr = true; 3084 break; 3085 } 3086 } 3087 3088 // Regardless of src and dest of copy, we emit the load of src 3089 // element as this is required in all directions 3090 SrcElementAddr = Bld.CreateElementBitCast( 3091 SrcElementAddr, CGF.ConvertTypeForMem(Private->getType())); 3092 DestElementAddr = Bld.CreateElementBitCast(DestElementAddr, 3093 SrcElementAddr.getElementType()); 3094 3095 // Now that all active lanes have read the element in the 3096 // Reduce list, shuffle over the value from the remote lane. 3097 if (ShuffleInElement) { 3098 shuffleAndStore(CGF, SrcElementAddr, DestElementAddr, Private->getType(), 3099 RemoteLaneOffset, Private->getExprLoc()); 3100 } else { 3101 switch (CGF.getEvaluationKind(Private->getType())) { 3102 case TEK_Scalar: { 3103 llvm::Value *Elem = 3104 CGF.EmitLoadOfScalar(SrcElementAddr, /*Volatile=*/false, 3105 Private->getType(), Private->getExprLoc()); 3106 // Store the source element value to the dest element address. 3107 CGF.EmitStoreOfScalar(Elem, DestElementAddr, /*Volatile=*/false, 3108 Private->getType()); 3109 break; 3110 } 3111 case TEK_Complex: { 3112 CodeGenFunction::ComplexPairTy Elem = CGF.EmitLoadOfComplex( 3113 CGF.MakeAddrLValue(SrcElementAddr, Private->getType()), 3114 Private->getExprLoc()); 3115 CGF.EmitStoreOfComplex( 3116 Elem, CGF.MakeAddrLValue(DestElementAddr, Private->getType()), 3117 /*isInit=*/false); 3118 break; 3119 } 3120 case TEK_Aggregate: 3121 CGF.EmitAggregateCopy( 3122 CGF.MakeAddrLValue(DestElementAddr, Private->getType()), 3123 CGF.MakeAddrLValue(SrcElementAddr, Private->getType()), 3124 Private->getType(), AggValueSlot::DoesNotOverlap); 3125 break; 3126 } 3127 } 3128 3129 // Step 3.1: Modify reference in dest Reduce list as needed. 3130 // Modifying the reference in Reduce list to point to the newly 3131 // created element. The element is live in the current function 3132 // scope and that of functions it invokes (i.e., reduce_function). 3133 // RemoteReduceData[i] = (void*)&RemoteElem 3134 if (UpdateDestListPtr) { 3135 CGF.EmitStoreOfScalar(Bld.CreatePointerBitCastOrAddrSpaceCast( 3136 DestElementAddr.getPointer(), CGF.VoidPtrTy), 3137 DestElementPtrAddr, /*Volatile=*/false, 3138 C.VoidPtrTy); 3139 } 3140 3141 // Step 4.1: Increment SrcBase/DestBase so that it points to the starting 3142 // address of the next element in scratchpad memory, unless we're currently 3143 // processing the last one. Memory alignment is also taken care of here. 3144 if ((IncrScratchpadDest || IncrScratchpadSrc) && (Idx + 1 < Size)) { 3145 llvm::Value *ScratchpadBasePtr = 3146 IncrScratchpadDest ? DestBase.getPointer() : SrcBase.getPointer(); 3147 llvm::Value *ElementSizeInChars = CGF.getTypeSize(Private->getType()); 3148 ScratchpadBasePtr = Bld.CreateNUWAdd( 3149 ScratchpadBasePtr, 3150 Bld.CreateNUWMul(ScratchpadWidth, ElementSizeInChars)); 3151 3152 // Take care of global memory alignment for performance 3153 ScratchpadBasePtr = Bld.CreateNUWSub( 3154 ScratchpadBasePtr, llvm::ConstantInt::get(CGM.SizeTy, 1)); 3155 ScratchpadBasePtr = Bld.CreateUDiv( 3156 ScratchpadBasePtr, 3157 llvm::ConstantInt::get(CGM.SizeTy, GlobalMemoryAlignment)); 3158 ScratchpadBasePtr = Bld.CreateNUWAdd( 3159 ScratchpadBasePtr, llvm::ConstantInt::get(CGM.SizeTy, 1)); 3160 ScratchpadBasePtr = Bld.CreateNUWMul( 3161 ScratchpadBasePtr, 3162 llvm::ConstantInt::get(CGM.SizeTy, GlobalMemoryAlignment)); 3163 3164 if (IncrScratchpadDest) 3165 DestBase = Address(ScratchpadBasePtr, CGF.getPointerAlign()); 3166 else /* IncrScratchpadSrc = true */ 3167 SrcBase = Address(ScratchpadBasePtr, CGF.getPointerAlign()); 3168 } 3169 3170 ++Idx; 3171 } 3172 } 3173 3174 /// This function emits a helper that gathers Reduce lists from the first 3175 /// lane of every active warp to lanes in the first warp. 3176 /// 3177 /// void inter_warp_copy_func(void* reduce_data, num_warps) 3178 /// shared smem[warp_size]; 3179 /// For all data entries D in reduce_data: 3180 /// sync 3181 /// If (I am the first lane in each warp) 3182 /// Copy my local D to smem[warp_id] 3183 /// sync 3184 /// if (I am the first warp) 3185 /// Copy smem[thread_id] to my local D 3186 static llvm::Value *emitInterWarpCopyFunction(CodeGenModule &CGM, 3187 ArrayRef<const Expr *> Privates, 3188 QualType ReductionArrayTy, 3189 SourceLocation Loc) { 3190 ASTContext &C = CGM.getContext(); 3191 llvm::Module &M = CGM.getModule(); 3192 3193 // ReduceList: thread local Reduce list. 3194 // At the stage of the computation when this function is called, partially 3195 // aggregated values reside in the first lane of every active warp. 3196 ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3197 C.VoidPtrTy, ImplicitParamDecl::Other); 3198 // NumWarps: number of warps active in the parallel region. This could 3199 // be smaller than 32 (max warps in a CTA) for partial block reduction. 3200 ImplicitParamDecl NumWarpsArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3201 C.getIntTypeForBitwidth(32, /* Signed */ true), 3202 ImplicitParamDecl::Other); 3203 FunctionArgList Args; 3204 Args.push_back(&ReduceListArg); 3205 Args.push_back(&NumWarpsArg); 3206 3207 const CGFunctionInfo &CGFI = 3208 CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); 3209 auto *Fn = llvm::Function::Create(CGM.getTypes().GetFunctionType(CGFI), 3210 llvm::GlobalValue::InternalLinkage, 3211 "_omp_reduction_inter_warp_copy_func", &M); 3212 CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); 3213 Fn->setDoesNotRecurse(); 3214 CodeGenFunction CGF(CGM); 3215 CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); 3216 3217 CGBuilderTy &Bld = CGF.Builder; 3218 3219 // This array is used as a medium to transfer, one reduce element at a time, 3220 // the data from the first lane of every warp to lanes in the first warp 3221 // in order to perform the final step of a reduction in a parallel region 3222 // (reduction across warps). The array is placed in NVPTX __shared__ memory 3223 // for reduced latency, as well as to have a distinct copy for concurrently 3224 // executing target regions. The array is declared with common linkage so 3225 // as to be shared across compilation units. 3226 StringRef TransferMediumName = 3227 "__openmp_nvptx_data_transfer_temporary_storage"; 3228 llvm::GlobalVariable *TransferMedium = 3229 M.getGlobalVariable(TransferMediumName); 3230 unsigned WarpSize = CGF.getTarget().getGridValue(llvm::omp::GV_Warp_Size); 3231 if (!TransferMedium) { 3232 auto *Ty = llvm::ArrayType::get(CGM.Int32Ty, WarpSize); 3233 unsigned SharedAddressSpace = C.getTargetAddressSpace(LangAS::cuda_shared); 3234 TransferMedium = new llvm::GlobalVariable( 3235 M, Ty, /*isConstant=*/false, llvm::GlobalVariable::CommonLinkage, 3236 llvm::Constant::getNullValue(Ty), TransferMediumName, 3237 /*InsertBefore=*/nullptr, llvm::GlobalVariable::NotThreadLocal, 3238 SharedAddressSpace); 3239 CGM.addCompilerUsedGlobal(TransferMedium); 3240 } 3241 3242 auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); 3243 // Get the CUDA thread id of the current OpenMP thread on the GPU. 3244 llvm::Value *ThreadID = RT.getGPUThreadID(CGF); 3245 // nvptx_lane_id = nvptx_id % warpsize 3246 llvm::Value *LaneID = getNVPTXLaneID(CGF); 3247 // nvptx_warp_id = nvptx_id / warpsize 3248 llvm::Value *WarpID = getNVPTXWarpID(CGF); 3249 3250 Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); 3251 Address LocalReduceList( 3252 Bld.CreatePointerBitCastOrAddrSpaceCast( 3253 CGF.EmitLoadOfScalar(AddrReduceListArg, /*Volatile=*/false, 3254 C.VoidPtrTy, Loc), 3255 CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo()), 3256 CGF.getPointerAlign()); 3257 3258 unsigned Idx = 0; 3259 for (const Expr *Private : Privates) { 3260 // 3261 // Warp master copies reduce element to transfer medium in __shared__ 3262 // memory. 3263 // 3264 unsigned RealTySize = 3265 C.getTypeSizeInChars(Private->getType()) 3266 .alignTo(C.getTypeAlignInChars(Private->getType())) 3267 .getQuantity(); 3268 for (unsigned TySize = 4; TySize > 0 && RealTySize > 0; TySize /=2) { 3269 unsigned NumIters = RealTySize / TySize; 3270 if (NumIters == 0) 3271 continue; 3272 QualType CType = C.getIntTypeForBitwidth( 3273 C.toBits(CharUnits::fromQuantity(TySize)), /*Signed=*/1); 3274 llvm::Type *CopyType = CGF.ConvertTypeForMem(CType); 3275 CharUnits Align = CharUnits::fromQuantity(TySize); 3276 llvm::Value *Cnt = nullptr; 3277 Address CntAddr = Address::invalid(); 3278 llvm::BasicBlock *PrecondBB = nullptr; 3279 llvm::BasicBlock *ExitBB = nullptr; 3280 if (NumIters > 1) { 3281 CntAddr = CGF.CreateMemTemp(C.IntTy, ".cnt.addr"); 3282 CGF.EmitStoreOfScalar(llvm::Constant::getNullValue(CGM.IntTy), CntAddr, 3283 /*Volatile=*/false, C.IntTy); 3284 PrecondBB = CGF.createBasicBlock("precond"); 3285 ExitBB = CGF.createBasicBlock("exit"); 3286 llvm::BasicBlock *BodyBB = CGF.createBasicBlock("body"); 3287 // There is no need to emit line number for unconditional branch. 3288 (void)ApplyDebugLocation::CreateEmpty(CGF); 3289 CGF.EmitBlock(PrecondBB); 3290 Cnt = CGF.EmitLoadOfScalar(CntAddr, /*Volatile=*/false, C.IntTy, Loc); 3291 llvm::Value *Cmp = 3292 Bld.CreateICmpULT(Cnt, llvm::ConstantInt::get(CGM.IntTy, NumIters)); 3293 Bld.CreateCondBr(Cmp, BodyBB, ExitBB); 3294 CGF.EmitBlock(BodyBB); 3295 } 3296 // kmpc_barrier. 3297 CGM.getOpenMPRuntime().emitBarrierCall(CGF, Loc, OMPD_unknown, 3298 /*EmitChecks=*/false, 3299 /*ForceSimpleCall=*/true); 3300 llvm::BasicBlock *ThenBB = CGF.createBasicBlock("then"); 3301 llvm::BasicBlock *ElseBB = CGF.createBasicBlock("else"); 3302 llvm::BasicBlock *MergeBB = CGF.createBasicBlock("ifcont"); 3303 3304 // if (lane_id == 0) 3305 llvm::Value *IsWarpMaster = Bld.CreateIsNull(LaneID, "warp_master"); 3306 Bld.CreateCondBr(IsWarpMaster, ThenBB, ElseBB); 3307 CGF.EmitBlock(ThenBB); 3308 3309 // Reduce element = LocalReduceList[i] 3310 Address ElemPtrPtrAddr = Bld.CreateConstArrayGEP(LocalReduceList, Idx); 3311 llvm::Value *ElemPtrPtr = CGF.EmitLoadOfScalar( 3312 ElemPtrPtrAddr, /*Volatile=*/false, C.VoidPtrTy, SourceLocation()); 3313 // elemptr = ((CopyType*)(elemptrptr)) + I 3314 Address ElemPtr = Address(ElemPtrPtr, Align); 3315 ElemPtr = Bld.CreateElementBitCast(ElemPtr, CopyType); 3316 if (NumIters > 1) { 3317 ElemPtr = Address(Bld.CreateGEP(ElemPtr.getPointer(), Cnt), 3318 ElemPtr.getAlignment()); 3319 } 3320 3321 // Get pointer to location in transfer medium. 3322 // MediumPtr = &medium[warp_id] 3323 llvm::Value *MediumPtrVal = Bld.CreateInBoundsGEP( 3324 TransferMedium, {llvm::Constant::getNullValue(CGM.Int64Ty), WarpID}); 3325 Address MediumPtr(MediumPtrVal, Align); 3326 // Casting to actual data type. 3327 // MediumPtr = (CopyType*)MediumPtrAddr; 3328 MediumPtr = Bld.CreateElementBitCast(MediumPtr, CopyType); 3329 3330 // elem = *elemptr 3331 //*MediumPtr = elem 3332 llvm::Value *Elem = 3333 CGF.EmitLoadOfScalar(ElemPtr, /*Volatile=*/false, CType, Loc); 3334 // Store the source element value to the dest element address. 3335 CGF.EmitStoreOfScalar(Elem, MediumPtr, /*Volatile=*/true, CType); 3336 3337 Bld.CreateBr(MergeBB); 3338 3339 CGF.EmitBlock(ElseBB); 3340 Bld.CreateBr(MergeBB); 3341 3342 CGF.EmitBlock(MergeBB); 3343 3344 // kmpc_barrier. 3345 CGM.getOpenMPRuntime().emitBarrierCall(CGF, Loc, OMPD_unknown, 3346 /*EmitChecks=*/false, 3347 /*ForceSimpleCall=*/true); 3348 3349 // 3350 // Warp 0 copies reduce element from transfer medium. 3351 // 3352 llvm::BasicBlock *W0ThenBB = CGF.createBasicBlock("then"); 3353 llvm::BasicBlock *W0ElseBB = CGF.createBasicBlock("else"); 3354 llvm::BasicBlock *W0MergeBB = CGF.createBasicBlock("ifcont"); 3355 3356 Address AddrNumWarpsArg = CGF.GetAddrOfLocalVar(&NumWarpsArg); 3357 llvm::Value *NumWarpsVal = CGF.EmitLoadOfScalar( 3358 AddrNumWarpsArg, /*Volatile=*/false, C.IntTy, Loc); 3359 3360 // Up to 32 threads in warp 0 are active. 3361 llvm::Value *IsActiveThread = 3362 Bld.CreateICmpULT(ThreadID, NumWarpsVal, "is_active_thread"); 3363 Bld.CreateCondBr(IsActiveThread, W0ThenBB, W0ElseBB); 3364 3365 CGF.EmitBlock(W0ThenBB); 3366 3367 // SrcMediumPtr = &medium[tid] 3368 llvm::Value *SrcMediumPtrVal = Bld.CreateInBoundsGEP( 3369 TransferMedium, 3370 {llvm::Constant::getNullValue(CGM.Int64Ty), ThreadID}); 3371 Address SrcMediumPtr(SrcMediumPtrVal, Align); 3372 // SrcMediumVal = *SrcMediumPtr; 3373 SrcMediumPtr = Bld.CreateElementBitCast(SrcMediumPtr, CopyType); 3374 3375 // TargetElemPtr = (CopyType*)(SrcDataAddr[i]) + I 3376 Address TargetElemPtrPtr = Bld.CreateConstArrayGEP(LocalReduceList, Idx); 3377 llvm::Value *TargetElemPtrVal = CGF.EmitLoadOfScalar( 3378 TargetElemPtrPtr, /*Volatile=*/false, C.VoidPtrTy, Loc); 3379 Address TargetElemPtr = Address(TargetElemPtrVal, Align); 3380 TargetElemPtr = Bld.CreateElementBitCast(TargetElemPtr, CopyType); 3381 if (NumIters > 1) { 3382 TargetElemPtr = Address(Bld.CreateGEP(TargetElemPtr.getPointer(), Cnt), 3383 TargetElemPtr.getAlignment()); 3384 } 3385 3386 // *TargetElemPtr = SrcMediumVal; 3387 llvm::Value *SrcMediumValue = 3388 CGF.EmitLoadOfScalar(SrcMediumPtr, /*Volatile=*/true, CType, Loc); 3389 CGF.EmitStoreOfScalar(SrcMediumValue, TargetElemPtr, /*Volatile=*/false, 3390 CType); 3391 Bld.CreateBr(W0MergeBB); 3392 3393 CGF.EmitBlock(W0ElseBB); 3394 Bld.CreateBr(W0MergeBB); 3395 3396 CGF.EmitBlock(W0MergeBB); 3397 3398 if (NumIters > 1) { 3399 Cnt = Bld.CreateNSWAdd(Cnt, llvm::ConstantInt::get(CGM.IntTy, /*V=*/1)); 3400 CGF.EmitStoreOfScalar(Cnt, CntAddr, /*Volatile=*/false, C.IntTy); 3401 CGF.EmitBranch(PrecondBB); 3402 (void)ApplyDebugLocation::CreateEmpty(CGF); 3403 CGF.EmitBlock(ExitBB); 3404 } 3405 RealTySize %= TySize; 3406 } 3407 ++Idx; 3408 } 3409 3410 CGF.FinishFunction(); 3411 return Fn; 3412 } 3413 3414 /// Emit a helper that reduces data across two OpenMP threads (lanes) 3415 /// in the same warp. It uses shuffle instructions to copy over data from 3416 /// a remote lane's stack. The reduction algorithm performed is specified 3417 /// by the fourth parameter. 3418 /// 3419 /// Algorithm Versions. 3420 /// Full Warp Reduce (argument value 0): 3421 /// This algorithm assumes that all 32 lanes are active and gathers 3422 /// data from these 32 lanes, producing a single resultant value. 3423 /// Contiguous Partial Warp Reduce (argument value 1): 3424 /// This algorithm assumes that only a *contiguous* subset of lanes 3425 /// are active. This happens for the last warp in a parallel region 3426 /// when the user specified num_threads is not an integer multiple of 3427 /// 32. This contiguous subset always starts with the zeroth lane. 3428 /// Partial Warp Reduce (argument value 2): 3429 /// This algorithm gathers data from any number of lanes at any position. 3430 /// All reduced values are stored in the lowest possible lane. The set 3431 /// of problems every algorithm addresses is a super set of those 3432 /// addressable by algorithms with a lower version number. Overhead 3433 /// increases as algorithm version increases. 3434 /// 3435 /// Terminology 3436 /// Reduce element: 3437 /// Reduce element refers to the individual data field with primitive 3438 /// data types to be combined and reduced across threads. 3439 /// Reduce list: 3440 /// Reduce list refers to a collection of local, thread-private 3441 /// reduce elements. 3442 /// Remote Reduce list: 3443 /// Remote Reduce list refers to a collection of remote (relative to 3444 /// the current thread) reduce elements. 3445 /// 3446 /// We distinguish between three states of threads that are important to 3447 /// the implementation of this function. 3448 /// Alive threads: 3449 /// Threads in a warp executing the SIMT instruction, as distinguished from 3450 /// threads that are inactive due to divergent control flow. 3451 /// Active threads: 3452 /// The minimal set of threads that has to be alive upon entry to this 3453 /// function. The computation is correct iff active threads are alive. 3454 /// Some threads are alive but they are not active because they do not 3455 /// contribute to the computation in any useful manner. Turning them off 3456 /// may introduce control flow overheads without any tangible benefits. 3457 /// Effective threads: 3458 /// In order to comply with the argument requirements of the shuffle 3459 /// function, we must keep all lanes holding data alive. But at most 3460 /// half of them perform value aggregation; we refer to this half of 3461 /// threads as effective. The other half is simply handing off their 3462 /// data. 3463 /// 3464 /// Procedure 3465 /// Value shuffle: 3466 /// In this step active threads transfer data from higher lane positions 3467 /// in the warp to lower lane positions, creating Remote Reduce list. 3468 /// Value aggregation: 3469 /// In this step, effective threads combine their thread local Reduce list 3470 /// with Remote Reduce list and store the result in the thread local 3471 /// Reduce list. 3472 /// Value copy: 3473 /// In this step, we deal with the assumption made by algorithm 2 3474 /// (i.e. contiguity assumption). When we have an odd number of lanes 3475 /// active, say 2k+1, only k threads will be effective and therefore k 3476 /// new values will be produced. However, the Reduce list owned by the 3477 /// (2k+1)th thread is ignored in the value aggregation. Therefore 3478 /// we copy the Reduce list from the (2k+1)th lane to (k+1)th lane so 3479 /// that the contiguity assumption still holds. 3480 static llvm::Function *emitShuffleAndReduceFunction( 3481 CodeGenModule &CGM, ArrayRef<const Expr *> Privates, 3482 QualType ReductionArrayTy, llvm::Function *ReduceFn, SourceLocation Loc) { 3483 ASTContext &C = CGM.getContext(); 3484 3485 // Thread local Reduce list used to host the values of data to be reduced. 3486 ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3487 C.VoidPtrTy, ImplicitParamDecl::Other); 3488 // Current lane id; could be logical. 3489 ImplicitParamDecl LaneIDArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.ShortTy, 3490 ImplicitParamDecl::Other); 3491 // Offset of the remote source lane relative to the current lane. 3492 ImplicitParamDecl RemoteLaneOffsetArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3493 C.ShortTy, ImplicitParamDecl::Other); 3494 // Algorithm version. This is expected to be known at compile time. 3495 ImplicitParamDecl AlgoVerArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3496 C.ShortTy, ImplicitParamDecl::Other); 3497 FunctionArgList Args; 3498 Args.push_back(&ReduceListArg); 3499 Args.push_back(&LaneIDArg); 3500 Args.push_back(&RemoteLaneOffsetArg); 3501 Args.push_back(&AlgoVerArg); 3502 3503 const CGFunctionInfo &CGFI = 3504 CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); 3505 auto *Fn = llvm::Function::Create( 3506 CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, 3507 "_omp_reduction_shuffle_and_reduce_func", &CGM.getModule()); 3508 CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); 3509 Fn->setDoesNotRecurse(); 3510 if (CGM.getLangOpts().Optimize) { 3511 Fn->removeFnAttr(llvm::Attribute::NoInline); 3512 Fn->removeFnAttr(llvm::Attribute::OptimizeNone); 3513 Fn->addFnAttr(llvm::Attribute::AlwaysInline); 3514 } 3515 3516 CodeGenFunction CGF(CGM); 3517 CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); 3518 3519 CGBuilderTy &Bld = CGF.Builder; 3520 3521 Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); 3522 Address LocalReduceList( 3523 Bld.CreatePointerBitCastOrAddrSpaceCast( 3524 CGF.EmitLoadOfScalar(AddrReduceListArg, /*Volatile=*/false, 3525 C.VoidPtrTy, SourceLocation()), 3526 CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo()), 3527 CGF.getPointerAlign()); 3528 3529 Address AddrLaneIDArg = CGF.GetAddrOfLocalVar(&LaneIDArg); 3530 llvm::Value *LaneIDArgVal = CGF.EmitLoadOfScalar( 3531 AddrLaneIDArg, /*Volatile=*/false, C.ShortTy, SourceLocation()); 3532 3533 Address AddrRemoteLaneOffsetArg = CGF.GetAddrOfLocalVar(&RemoteLaneOffsetArg); 3534 llvm::Value *RemoteLaneOffsetArgVal = CGF.EmitLoadOfScalar( 3535 AddrRemoteLaneOffsetArg, /*Volatile=*/false, C.ShortTy, SourceLocation()); 3536 3537 Address AddrAlgoVerArg = CGF.GetAddrOfLocalVar(&AlgoVerArg); 3538 llvm::Value *AlgoVerArgVal = CGF.EmitLoadOfScalar( 3539 AddrAlgoVerArg, /*Volatile=*/false, C.ShortTy, SourceLocation()); 3540 3541 // Create a local thread-private variable to host the Reduce list 3542 // from a remote lane. 3543 Address RemoteReduceList = 3544 CGF.CreateMemTemp(ReductionArrayTy, ".omp.reduction.remote_reduce_list"); 3545 3546 // This loop iterates through the list of reduce elements and copies, 3547 // element by element, from a remote lane in the warp to RemoteReduceList, 3548 // hosted on the thread's stack. 3549 emitReductionListCopy(RemoteLaneToThread, CGF, ReductionArrayTy, Privates, 3550 LocalReduceList, RemoteReduceList, 3551 {/*RemoteLaneOffset=*/RemoteLaneOffsetArgVal, 3552 /*ScratchpadIndex=*/nullptr, 3553 /*ScratchpadWidth=*/nullptr}); 3554 3555 // The actions to be performed on the Remote Reduce list is dependent 3556 // on the algorithm version. 3557 // 3558 // if (AlgoVer==0) || (AlgoVer==1 && (LaneId < Offset)) || (AlgoVer==2 && 3559 // LaneId % 2 == 0 && Offset > 0): 3560 // do the reduction value aggregation 3561 // 3562 // The thread local variable Reduce list is mutated in place to host the 3563 // reduced data, which is the aggregated value produced from local and 3564 // remote lanes. 3565 // 3566 // Note that AlgoVer is expected to be a constant integer known at compile 3567 // time. 3568 // When AlgoVer==0, the first conjunction evaluates to true, making 3569 // the entire predicate true during compile time. 3570 // When AlgoVer==1, the second conjunction has only the second part to be 3571 // evaluated during runtime. Other conjunctions evaluates to false 3572 // during compile time. 3573 // When AlgoVer==2, the third conjunction has only the second part to be 3574 // evaluated during runtime. Other conjunctions evaluates to false 3575 // during compile time. 3576 llvm::Value *CondAlgo0 = Bld.CreateIsNull(AlgoVerArgVal); 3577 3578 llvm::Value *Algo1 = Bld.CreateICmpEQ(AlgoVerArgVal, Bld.getInt16(1)); 3579 llvm::Value *CondAlgo1 = Bld.CreateAnd( 3580 Algo1, Bld.CreateICmpULT(LaneIDArgVal, RemoteLaneOffsetArgVal)); 3581 3582 llvm::Value *Algo2 = Bld.CreateICmpEQ(AlgoVerArgVal, Bld.getInt16(2)); 3583 llvm::Value *CondAlgo2 = Bld.CreateAnd( 3584 Algo2, Bld.CreateIsNull(Bld.CreateAnd(LaneIDArgVal, Bld.getInt16(1)))); 3585 CondAlgo2 = Bld.CreateAnd( 3586 CondAlgo2, Bld.CreateICmpSGT(RemoteLaneOffsetArgVal, Bld.getInt16(0))); 3587 3588 llvm::Value *CondReduce = Bld.CreateOr(CondAlgo0, CondAlgo1); 3589 CondReduce = Bld.CreateOr(CondReduce, CondAlgo2); 3590 3591 llvm::BasicBlock *ThenBB = CGF.createBasicBlock("then"); 3592 llvm::BasicBlock *ElseBB = CGF.createBasicBlock("else"); 3593 llvm::BasicBlock *MergeBB = CGF.createBasicBlock("ifcont"); 3594 Bld.CreateCondBr(CondReduce, ThenBB, ElseBB); 3595 3596 CGF.EmitBlock(ThenBB); 3597 // reduce_function(LocalReduceList, RemoteReduceList) 3598 llvm::Value *LocalReduceListPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( 3599 LocalReduceList.getPointer(), CGF.VoidPtrTy); 3600 llvm::Value *RemoteReduceListPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( 3601 RemoteReduceList.getPointer(), CGF.VoidPtrTy); 3602 CGM.getOpenMPRuntime().emitOutlinedFunctionCall( 3603 CGF, Loc, ReduceFn, {LocalReduceListPtr, RemoteReduceListPtr}); 3604 Bld.CreateBr(MergeBB); 3605 3606 CGF.EmitBlock(ElseBB); 3607 Bld.CreateBr(MergeBB); 3608 3609 CGF.EmitBlock(MergeBB); 3610 3611 // if (AlgoVer==1 && (LaneId >= Offset)) copy Remote Reduce list to local 3612 // Reduce list. 3613 Algo1 = Bld.CreateICmpEQ(AlgoVerArgVal, Bld.getInt16(1)); 3614 llvm::Value *CondCopy = Bld.CreateAnd( 3615 Algo1, Bld.CreateICmpUGE(LaneIDArgVal, RemoteLaneOffsetArgVal)); 3616 3617 llvm::BasicBlock *CpyThenBB = CGF.createBasicBlock("then"); 3618 llvm::BasicBlock *CpyElseBB = CGF.createBasicBlock("else"); 3619 llvm::BasicBlock *CpyMergeBB = CGF.createBasicBlock("ifcont"); 3620 Bld.CreateCondBr(CondCopy, CpyThenBB, CpyElseBB); 3621 3622 CGF.EmitBlock(CpyThenBB); 3623 emitReductionListCopy(ThreadCopy, CGF, ReductionArrayTy, Privates, 3624 RemoteReduceList, LocalReduceList); 3625 Bld.CreateBr(CpyMergeBB); 3626 3627 CGF.EmitBlock(CpyElseBB); 3628 Bld.CreateBr(CpyMergeBB); 3629 3630 CGF.EmitBlock(CpyMergeBB); 3631 3632 CGF.FinishFunction(); 3633 return Fn; 3634 } 3635 3636 /// This function emits a helper that copies all the reduction variables from 3637 /// the team into the provided global buffer for the reduction variables. 3638 /// 3639 /// void list_to_global_copy_func(void *buffer, int Idx, void *reduce_data) 3640 /// For all data entries D in reduce_data: 3641 /// Copy local D to buffer.D[Idx] 3642 static llvm::Value *emitListToGlobalCopyFunction( 3643 CodeGenModule &CGM, ArrayRef<const Expr *> Privates, 3644 QualType ReductionArrayTy, SourceLocation Loc, 3645 const RecordDecl *TeamReductionRec, 3646 const llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> 3647 &VarFieldMap) { 3648 ASTContext &C = CGM.getContext(); 3649 3650 // Buffer: global reduction buffer. 3651 ImplicitParamDecl BufferArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3652 C.VoidPtrTy, ImplicitParamDecl::Other); 3653 // Idx: index of the buffer. 3654 ImplicitParamDecl IdxArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.IntTy, 3655 ImplicitParamDecl::Other); 3656 // ReduceList: thread local Reduce list. 3657 ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3658 C.VoidPtrTy, ImplicitParamDecl::Other); 3659 FunctionArgList Args; 3660 Args.push_back(&BufferArg); 3661 Args.push_back(&IdxArg); 3662 Args.push_back(&ReduceListArg); 3663 3664 const CGFunctionInfo &CGFI = 3665 CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); 3666 auto *Fn = llvm::Function::Create( 3667 CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, 3668 "_omp_reduction_list_to_global_copy_func", &CGM.getModule()); 3669 CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); 3670 Fn->setDoesNotRecurse(); 3671 CodeGenFunction CGF(CGM); 3672 CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); 3673 3674 CGBuilderTy &Bld = CGF.Builder; 3675 3676 Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); 3677 Address AddrBufferArg = CGF.GetAddrOfLocalVar(&BufferArg); 3678 Address LocalReduceList( 3679 Bld.CreatePointerBitCastOrAddrSpaceCast( 3680 CGF.EmitLoadOfScalar(AddrReduceListArg, /*Volatile=*/false, 3681 C.VoidPtrTy, Loc), 3682 CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo()), 3683 CGF.getPointerAlign()); 3684 QualType StaticTy = C.getRecordType(TeamReductionRec); 3685 llvm::Type *LLVMReductionsBufferTy = 3686 CGM.getTypes().ConvertTypeForMem(StaticTy); 3687 llvm::Value *BufferArrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( 3688 CGF.EmitLoadOfScalar(AddrBufferArg, /*Volatile=*/false, C.VoidPtrTy, Loc), 3689 LLVMReductionsBufferTy->getPointerTo()); 3690 llvm::Value *Idxs[] = {llvm::ConstantInt::getNullValue(CGF.Int32Ty), 3691 CGF.EmitLoadOfScalar(CGF.GetAddrOfLocalVar(&IdxArg), 3692 /*Volatile=*/false, C.IntTy, 3693 Loc)}; 3694 unsigned Idx = 0; 3695 for (const Expr *Private : Privates) { 3696 // Reduce element = LocalReduceList[i] 3697 Address ElemPtrPtrAddr = Bld.CreateConstArrayGEP(LocalReduceList, Idx); 3698 llvm::Value *ElemPtrPtr = CGF.EmitLoadOfScalar( 3699 ElemPtrPtrAddr, /*Volatile=*/false, C.VoidPtrTy, SourceLocation()); 3700 // elemptr = ((CopyType*)(elemptrptr)) + I 3701 ElemPtrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( 3702 ElemPtrPtr, CGF.ConvertTypeForMem(Private->getType())->getPointerTo()); 3703 Address ElemPtr = 3704 Address(ElemPtrPtr, C.getTypeAlignInChars(Private->getType())); 3705 const ValueDecl *VD = cast<DeclRefExpr>(Private)->getDecl(); 3706 // Global = Buffer.VD[Idx]; 3707 const FieldDecl *FD = VarFieldMap.lookup(VD); 3708 LValue GlobLVal = CGF.EmitLValueForField( 3709 CGF.MakeNaturalAlignAddrLValue(BufferArrPtr, StaticTy), FD); 3710 llvm::Value *BufferPtr = 3711 Bld.CreateInBoundsGEP(GlobLVal.getPointer(CGF), Idxs); 3712 GlobLVal.setAddress(Address(BufferPtr, GlobLVal.getAlignment())); 3713 switch (CGF.getEvaluationKind(Private->getType())) { 3714 case TEK_Scalar: { 3715 llvm::Value *V = CGF.EmitLoadOfScalar(ElemPtr, /*Volatile=*/false, 3716 Private->getType(), Loc); 3717 CGF.EmitStoreOfScalar(V, GlobLVal); 3718 break; 3719 } 3720 case TEK_Complex: { 3721 CodeGenFunction::ComplexPairTy V = CGF.EmitLoadOfComplex( 3722 CGF.MakeAddrLValue(ElemPtr, Private->getType()), Loc); 3723 CGF.EmitStoreOfComplex(V, GlobLVal, /*isInit=*/false); 3724 break; 3725 } 3726 case TEK_Aggregate: 3727 CGF.EmitAggregateCopy(GlobLVal, 3728 CGF.MakeAddrLValue(ElemPtr, Private->getType()), 3729 Private->getType(), AggValueSlot::DoesNotOverlap); 3730 break; 3731 } 3732 ++Idx; 3733 } 3734 3735 CGF.FinishFunction(); 3736 return Fn; 3737 } 3738 3739 /// This function emits a helper that reduces all the reduction variables from 3740 /// the team into the provided global buffer for the reduction variables. 3741 /// 3742 /// void list_to_global_reduce_func(void *buffer, int Idx, void *reduce_data) 3743 /// void *GlobPtrs[]; 3744 /// GlobPtrs[0] = (void*)&buffer.D0[Idx]; 3745 /// ... 3746 /// GlobPtrs[N] = (void*)&buffer.DN[Idx]; 3747 /// reduce_function(GlobPtrs, reduce_data); 3748 static llvm::Value *emitListToGlobalReduceFunction( 3749 CodeGenModule &CGM, ArrayRef<const Expr *> Privates, 3750 QualType ReductionArrayTy, SourceLocation Loc, 3751 const RecordDecl *TeamReductionRec, 3752 const llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> 3753 &VarFieldMap, 3754 llvm::Function *ReduceFn) { 3755 ASTContext &C = CGM.getContext(); 3756 3757 // Buffer: global reduction buffer. 3758 ImplicitParamDecl BufferArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3759 C.VoidPtrTy, ImplicitParamDecl::Other); 3760 // Idx: index of the buffer. 3761 ImplicitParamDecl IdxArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.IntTy, 3762 ImplicitParamDecl::Other); 3763 // ReduceList: thread local Reduce list. 3764 ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3765 C.VoidPtrTy, ImplicitParamDecl::Other); 3766 FunctionArgList Args; 3767 Args.push_back(&BufferArg); 3768 Args.push_back(&IdxArg); 3769 Args.push_back(&ReduceListArg); 3770 3771 const CGFunctionInfo &CGFI = 3772 CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); 3773 auto *Fn = llvm::Function::Create( 3774 CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, 3775 "_omp_reduction_list_to_global_reduce_func", &CGM.getModule()); 3776 CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); 3777 Fn->setDoesNotRecurse(); 3778 CodeGenFunction CGF(CGM); 3779 CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); 3780 3781 CGBuilderTy &Bld = CGF.Builder; 3782 3783 Address AddrBufferArg = CGF.GetAddrOfLocalVar(&BufferArg); 3784 QualType StaticTy = C.getRecordType(TeamReductionRec); 3785 llvm::Type *LLVMReductionsBufferTy = 3786 CGM.getTypes().ConvertTypeForMem(StaticTy); 3787 llvm::Value *BufferArrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( 3788 CGF.EmitLoadOfScalar(AddrBufferArg, /*Volatile=*/false, C.VoidPtrTy, Loc), 3789 LLVMReductionsBufferTy->getPointerTo()); 3790 3791 // 1. Build a list of reduction variables. 3792 // void *RedList[<n>] = {<ReductionVars>[0], ..., <ReductionVars>[<n>-1]}; 3793 Address ReductionList = 3794 CGF.CreateMemTemp(ReductionArrayTy, ".omp.reduction.red_list"); 3795 auto IPriv = Privates.begin(); 3796 llvm::Value *Idxs[] = {llvm::ConstantInt::getNullValue(CGF.Int32Ty), 3797 CGF.EmitLoadOfScalar(CGF.GetAddrOfLocalVar(&IdxArg), 3798 /*Volatile=*/false, C.IntTy, 3799 Loc)}; 3800 unsigned Idx = 0; 3801 for (unsigned I = 0, E = Privates.size(); I < E; ++I, ++IPriv, ++Idx) { 3802 Address Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); 3803 // Global = Buffer.VD[Idx]; 3804 const ValueDecl *VD = cast<DeclRefExpr>(*IPriv)->getDecl(); 3805 const FieldDecl *FD = VarFieldMap.lookup(VD); 3806 LValue GlobLVal = CGF.EmitLValueForField( 3807 CGF.MakeNaturalAlignAddrLValue(BufferArrPtr, StaticTy), FD); 3808 llvm::Value *BufferPtr = 3809 Bld.CreateInBoundsGEP(GlobLVal.getPointer(CGF), Idxs); 3810 llvm::Value *Ptr = CGF.EmitCastToVoidPtr(BufferPtr); 3811 CGF.EmitStoreOfScalar(Ptr, Elem, /*Volatile=*/false, C.VoidPtrTy); 3812 if ((*IPriv)->getType()->isVariablyModifiedType()) { 3813 // Store array size. 3814 ++Idx; 3815 Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); 3816 llvm::Value *Size = CGF.Builder.CreateIntCast( 3817 CGF.getVLASize( 3818 CGF.getContext().getAsVariableArrayType((*IPriv)->getType())) 3819 .NumElts, 3820 CGF.SizeTy, /*isSigned=*/false); 3821 CGF.Builder.CreateStore(CGF.Builder.CreateIntToPtr(Size, CGF.VoidPtrTy), 3822 Elem); 3823 } 3824 } 3825 3826 // Call reduce_function(GlobalReduceList, ReduceList) 3827 llvm::Value *GlobalReduceList = 3828 CGF.EmitCastToVoidPtr(ReductionList.getPointer()); 3829 Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); 3830 llvm::Value *ReducedPtr = CGF.EmitLoadOfScalar( 3831 AddrReduceListArg, /*Volatile=*/false, C.VoidPtrTy, Loc); 3832 CGM.getOpenMPRuntime().emitOutlinedFunctionCall( 3833 CGF, Loc, ReduceFn, {GlobalReduceList, ReducedPtr}); 3834 CGF.FinishFunction(); 3835 return Fn; 3836 } 3837 3838 /// This function emits a helper that copies all the reduction variables from 3839 /// the team into the provided global buffer for the reduction variables. 3840 /// 3841 /// void list_to_global_copy_func(void *buffer, int Idx, void *reduce_data) 3842 /// For all data entries D in reduce_data: 3843 /// Copy buffer.D[Idx] to local D; 3844 static llvm::Value *emitGlobalToListCopyFunction( 3845 CodeGenModule &CGM, ArrayRef<const Expr *> Privates, 3846 QualType ReductionArrayTy, SourceLocation Loc, 3847 const RecordDecl *TeamReductionRec, 3848 const llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> 3849 &VarFieldMap) { 3850 ASTContext &C = CGM.getContext(); 3851 3852 // Buffer: global reduction buffer. 3853 ImplicitParamDecl BufferArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3854 C.VoidPtrTy, ImplicitParamDecl::Other); 3855 // Idx: index of the buffer. 3856 ImplicitParamDecl IdxArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.IntTy, 3857 ImplicitParamDecl::Other); 3858 // ReduceList: thread local Reduce list. 3859 ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3860 C.VoidPtrTy, ImplicitParamDecl::Other); 3861 FunctionArgList Args; 3862 Args.push_back(&BufferArg); 3863 Args.push_back(&IdxArg); 3864 Args.push_back(&ReduceListArg); 3865 3866 const CGFunctionInfo &CGFI = 3867 CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); 3868 auto *Fn = llvm::Function::Create( 3869 CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, 3870 "_omp_reduction_global_to_list_copy_func", &CGM.getModule()); 3871 CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); 3872 Fn->setDoesNotRecurse(); 3873 CodeGenFunction CGF(CGM); 3874 CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); 3875 3876 CGBuilderTy &Bld = CGF.Builder; 3877 3878 Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); 3879 Address AddrBufferArg = CGF.GetAddrOfLocalVar(&BufferArg); 3880 Address LocalReduceList( 3881 Bld.CreatePointerBitCastOrAddrSpaceCast( 3882 CGF.EmitLoadOfScalar(AddrReduceListArg, /*Volatile=*/false, 3883 C.VoidPtrTy, Loc), 3884 CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo()), 3885 CGF.getPointerAlign()); 3886 QualType StaticTy = C.getRecordType(TeamReductionRec); 3887 llvm::Type *LLVMReductionsBufferTy = 3888 CGM.getTypes().ConvertTypeForMem(StaticTy); 3889 llvm::Value *BufferArrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( 3890 CGF.EmitLoadOfScalar(AddrBufferArg, /*Volatile=*/false, C.VoidPtrTy, Loc), 3891 LLVMReductionsBufferTy->getPointerTo()); 3892 3893 llvm::Value *Idxs[] = {llvm::ConstantInt::getNullValue(CGF.Int32Ty), 3894 CGF.EmitLoadOfScalar(CGF.GetAddrOfLocalVar(&IdxArg), 3895 /*Volatile=*/false, C.IntTy, 3896 Loc)}; 3897 unsigned Idx = 0; 3898 for (const Expr *Private : Privates) { 3899 // Reduce element = LocalReduceList[i] 3900 Address ElemPtrPtrAddr = Bld.CreateConstArrayGEP(LocalReduceList, Idx); 3901 llvm::Value *ElemPtrPtr = CGF.EmitLoadOfScalar( 3902 ElemPtrPtrAddr, /*Volatile=*/false, C.VoidPtrTy, SourceLocation()); 3903 // elemptr = ((CopyType*)(elemptrptr)) + I 3904 ElemPtrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( 3905 ElemPtrPtr, CGF.ConvertTypeForMem(Private->getType())->getPointerTo()); 3906 Address ElemPtr = 3907 Address(ElemPtrPtr, C.getTypeAlignInChars(Private->getType())); 3908 const ValueDecl *VD = cast<DeclRefExpr>(Private)->getDecl(); 3909 // Global = Buffer.VD[Idx]; 3910 const FieldDecl *FD = VarFieldMap.lookup(VD); 3911 LValue GlobLVal = CGF.EmitLValueForField( 3912 CGF.MakeNaturalAlignAddrLValue(BufferArrPtr, StaticTy), FD); 3913 llvm::Value *BufferPtr = 3914 Bld.CreateInBoundsGEP(GlobLVal.getPointer(CGF), Idxs); 3915 GlobLVal.setAddress(Address(BufferPtr, GlobLVal.getAlignment())); 3916 switch (CGF.getEvaluationKind(Private->getType())) { 3917 case TEK_Scalar: { 3918 llvm::Value *V = CGF.EmitLoadOfScalar(GlobLVal, Loc); 3919 CGF.EmitStoreOfScalar(V, ElemPtr, /*Volatile=*/false, Private->getType()); 3920 break; 3921 } 3922 case TEK_Complex: { 3923 CodeGenFunction::ComplexPairTy V = CGF.EmitLoadOfComplex(GlobLVal, Loc); 3924 CGF.EmitStoreOfComplex(V, CGF.MakeAddrLValue(ElemPtr, Private->getType()), 3925 /*isInit=*/false); 3926 break; 3927 } 3928 case TEK_Aggregate: 3929 CGF.EmitAggregateCopy(CGF.MakeAddrLValue(ElemPtr, Private->getType()), 3930 GlobLVal, Private->getType(), 3931 AggValueSlot::DoesNotOverlap); 3932 break; 3933 } 3934 ++Idx; 3935 } 3936 3937 CGF.FinishFunction(); 3938 return Fn; 3939 } 3940 3941 /// This function emits a helper that reduces all the reduction variables from 3942 /// the team into the provided global buffer for the reduction variables. 3943 /// 3944 /// void global_to_list_reduce_func(void *buffer, int Idx, void *reduce_data) 3945 /// void *GlobPtrs[]; 3946 /// GlobPtrs[0] = (void*)&buffer.D0[Idx]; 3947 /// ... 3948 /// GlobPtrs[N] = (void*)&buffer.DN[Idx]; 3949 /// reduce_function(reduce_data, GlobPtrs); 3950 static llvm::Value *emitGlobalToListReduceFunction( 3951 CodeGenModule &CGM, ArrayRef<const Expr *> Privates, 3952 QualType ReductionArrayTy, SourceLocation Loc, 3953 const RecordDecl *TeamReductionRec, 3954 const llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> 3955 &VarFieldMap, 3956 llvm::Function *ReduceFn) { 3957 ASTContext &C = CGM.getContext(); 3958 3959 // Buffer: global reduction buffer. 3960 ImplicitParamDecl BufferArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3961 C.VoidPtrTy, ImplicitParamDecl::Other); 3962 // Idx: index of the buffer. 3963 ImplicitParamDecl IdxArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.IntTy, 3964 ImplicitParamDecl::Other); 3965 // ReduceList: thread local Reduce list. 3966 ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, 3967 C.VoidPtrTy, ImplicitParamDecl::Other); 3968 FunctionArgList Args; 3969 Args.push_back(&BufferArg); 3970 Args.push_back(&IdxArg); 3971 Args.push_back(&ReduceListArg); 3972 3973 const CGFunctionInfo &CGFI = 3974 CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); 3975 auto *Fn = llvm::Function::Create( 3976 CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, 3977 "_omp_reduction_global_to_list_reduce_func", &CGM.getModule()); 3978 CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); 3979 Fn->setDoesNotRecurse(); 3980 CodeGenFunction CGF(CGM); 3981 CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); 3982 3983 CGBuilderTy &Bld = CGF.Builder; 3984 3985 Address AddrBufferArg = CGF.GetAddrOfLocalVar(&BufferArg); 3986 QualType StaticTy = C.getRecordType(TeamReductionRec); 3987 llvm::Type *LLVMReductionsBufferTy = 3988 CGM.getTypes().ConvertTypeForMem(StaticTy); 3989 llvm::Value *BufferArrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( 3990 CGF.EmitLoadOfScalar(AddrBufferArg, /*Volatile=*/false, C.VoidPtrTy, Loc), 3991 LLVMReductionsBufferTy->getPointerTo()); 3992 3993 // 1. Build a list of reduction variables. 3994 // void *RedList[<n>] = {<ReductionVars>[0], ..., <ReductionVars>[<n>-1]}; 3995 Address ReductionList = 3996 CGF.CreateMemTemp(ReductionArrayTy, ".omp.reduction.red_list"); 3997 auto IPriv = Privates.begin(); 3998 llvm::Value *Idxs[] = {llvm::ConstantInt::getNullValue(CGF.Int32Ty), 3999 CGF.EmitLoadOfScalar(CGF.GetAddrOfLocalVar(&IdxArg), 4000 /*Volatile=*/false, C.IntTy, 4001 Loc)}; 4002 unsigned Idx = 0; 4003 for (unsigned I = 0, E = Privates.size(); I < E; ++I, ++IPriv, ++Idx) { 4004 Address Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); 4005 // Global = Buffer.VD[Idx]; 4006 const ValueDecl *VD = cast<DeclRefExpr>(*IPriv)->getDecl(); 4007 const FieldDecl *FD = VarFieldMap.lookup(VD); 4008 LValue GlobLVal = CGF.EmitLValueForField( 4009 CGF.MakeNaturalAlignAddrLValue(BufferArrPtr, StaticTy), FD); 4010 llvm::Value *BufferPtr = 4011 Bld.CreateInBoundsGEP(GlobLVal.getPointer(CGF), Idxs); 4012 llvm::Value *Ptr = CGF.EmitCastToVoidPtr(BufferPtr); 4013 CGF.EmitStoreOfScalar(Ptr, Elem, /*Volatile=*/false, C.VoidPtrTy); 4014 if ((*IPriv)->getType()->isVariablyModifiedType()) { 4015 // Store array size. 4016 ++Idx; 4017 Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); 4018 llvm::Value *Size = CGF.Builder.CreateIntCast( 4019 CGF.getVLASize( 4020 CGF.getContext().getAsVariableArrayType((*IPriv)->getType())) 4021 .NumElts, 4022 CGF.SizeTy, /*isSigned=*/false); 4023 CGF.Builder.CreateStore(CGF.Builder.CreateIntToPtr(Size, CGF.VoidPtrTy), 4024 Elem); 4025 } 4026 } 4027 4028 // Call reduce_function(ReduceList, GlobalReduceList) 4029 llvm::Value *GlobalReduceList = 4030 CGF.EmitCastToVoidPtr(ReductionList.getPointer()); 4031 Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); 4032 llvm::Value *ReducedPtr = CGF.EmitLoadOfScalar( 4033 AddrReduceListArg, /*Volatile=*/false, C.VoidPtrTy, Loc); 4034 CGM.getOpenMPRuntime().emitOutlinedFunctionCall( 4035 CGF, Loc, ReduceFn, {ReducedPtr, GlobalReduceList}); 4036 CGF.FinishFunction(); 4037 return Fn; 4038 } 4039 4040 /// 4041 /// Design of OpenMP reductions on the GPU 4042 /// 4043 /// Consider a typical OpenMP program with one or more reduction 4044 /// clauses: 4045 /// 4046 /// float foo; 4047 /// double bar; 4048 /// #pragma omp target teams distribute parallel for \ 4049 /// reduction(+:foo) reduction(*:bar) 4050 /// for (int i = 0; i < N; i++) { 4051 /// foo += A[i]; bar *= B[i]; 4052 /// } 4053 /// 4054 /// where 'foo' and 'bar' are reduced across all OpenMP threads in 4055 /// all teams. In our OpenMP implementation on the NVPTX device an 4056 /// OpenMP team is mapped to a CUDA threadblock and OpenMP threads 4057 /// within a team are mapped to CUDA threads within a threadblock. 4058 /// Our goal is to efficiently aggregate values across all OpenMP 4059 /// threads such that: 4060 /// 4061 /// - the compiler and runtime are logically concise, and 4062 /// - the reduction is performed efficiently in a hierarchical 4063 /// manner as follows: within OpenMP threads in the same warp, 4064 /// across warps in a threadblock, and finally across teams on 4065 /// the NVPTX device. 4066 /// 4067 /// Introduction to Decoupling 4068 /// 4069 /// We would like to decouple the compiler and the runtime so that the 4070 /// latter is ignorant of the reduction variables (number, data types) 4071 /// and the reduction operators. This allows a simpler interface 4072 /// and implementation while still attaining good performance. 4073 /// 4074 /// Pseudocode for the aforementioned OpenMP program generated by the 4075 /// compiler is as follows: 4076 /// 4077 /// 1. Create private copies of reduction variables on each OpenMP 4078 /// thread: 'foo_private', 'bar_private' 4079 /// 2. Each OpenMP thread reduces the chunk of 'A' and 'B' assigned 4080 /// to it and writes the result in 'foo_private' and 'bar_private' 4081 /// respectively. 4082 /// 3. Call the OpenMP runtime on the GPU to reduce within a team 4083 /// and store the result on the team master: 4084 /// 4085 /// __kmpc_nvptx_parallel_reduce_nowait_v2(..., 4086 /// reduceData, shuffleReduceFn, interWarpCpyFn) 4087 /// 4088 /// where: 4089 /// struct ReduceData { 4090 /// double *foo; 4091 /// double *bar; 4092 /// } reduceData 4093 /// reduceData.foo = &foo_private 4094 /// reduceData.bar = &bar_private 4095 /// 4096 /// 'shuffleReduceFn' and 'interWarpCpyFn' are pointers to two 4097 /// auxiliary functions generated by the compiler that operate on 4098 /// variables of type 'ReduceData'. They aid the runtime perform 4099 /// algorithmic steps in a data agnostic manner. 4100 /// 4101 /// 'shuffleReduceFn' is a pointer to a function that reduces data 4102 /// of type 'ReduceData' across two OpenMP threads (lanes) in the 4103 /// same warp. It takes the following arguments as input: 4104 /// 4105 /// a. variable of type 'ReduceData' on the calling lane, 4106 /// b. its lane_id, 4107 /// c. an offset relative to the current lane_id to generate a 4108 /// remote_lane_id. The remote lane contains the second 4109 /// variable of type 'ReduceData' that is to be reduced. 4110 /// d. an algorithm version parameter determining which reduction 4111 /// algorithm to use. 4112 /// 4113 /// 'shuffleReduceFn' retrieves data from the remote lane using 4114 /// efficient GPU shuffle intrinsics and reduces, using the 4115 /// algorithm specified by the 4th parameter, the two operands 4116 /// element-wise. The result is written to the first operand. 4117 /// 4118 /// Different reduction algorithms are implemented in different 4119 /// runtime functions, all calling 'shuffleReduceFn' to perform 4120 /// the essential reduction step. Therefore, based on the 4th 4121 /// parameter, this function behaves slightly differently to 4122 /// cooperate with the runtime to ensure correctness under 4123 /// different circumstances. 4124 /// 4125 /// 'InterWarpCpyFn' is a pointer to a function that transfers 4126 /// reduced variables across warps. It tunnels, through CUDA 4127 /// shared memory, the thread-private data of type 'ReduceData' 4128 /// from lane 0 of each warp to a lane in the first warp. 4129 /// 4. Call the OpenMP runtime on the GPU to reduce across teams. 4130 /// The last team writes the global reduced value to memory. 4131 /// 4132 /// ret = __kmpc_nvptx_teams_reduce_nowait(..., 4133 /// reduceData, shuffleReduceFn, interWarpCpyFn, 4134 /// scratchpadCopyFn, loadAndReduceFn) 4135 /// 4136 /// 'scratchpadCopyFn' is a helper that stores reduced 4137 /// data from the team master to a scratchpad array in 4138 /// global memory. 4139 /// 4140 /// 'loadAndReduceFn' is a helper that loads data from 4141 /// the scratchpad array and reduces it with the input 4142 /// operand. 4143 /// 4144 /// These compiler generated functions hide address 4145 /// calculation and alignment information from the runtime. 4146 /// 5. if ret == 1: 4147 /// The team master of the last team stores the reduced 4148 /// result to the globals in memory. 4149 /// foo += reduceData.foo; bar *= reduceData.bar 4150 /// 4151 /// 4152 /// Warp Reduction Algorithms 4153 /// 4154 /// On the warp level, we have three algorithms implemented in the 4155 /// OpenMP runtime depending on the number of active lanes: 4156 /// 4157 /// Full Warp Reduction 4158 /// 4159 /// The reduce algorithm within a warp where all lanes are active 4160 /// is implemented in the runtime as follows: 4161 /// 4162 /// full_warp_reduce(void *reduce_data, 4163 /// kmp_ShuffleReductFctPtr ShuffleReduceFn) { 4164 /// for (int offset = WARPSIZE/2; offset > 0; offset /= 2) 4165 /// ShuffleReduceFn(reduce_data, 0, offset, 0); 4166 /// } 4167 /// 4168 /// The algorithm completes in log(2, WARPSIZE) steps. 4169 /// 4170 /// 'ShuffleReduceFn' is used here with lane_id set to 0 because it is 4171 /// not used therefore we save instructions by not retrieving lane_id 4172 /// from the corresponding special registers. The 4th parameter, which 4173 /// represents the version of the algorithm being used, is set to 0 to 4174 /// signify full warp reduction. 4175 /// 4176 /// In this version, 'ShuffleReduceFn' behaves, per element, as follows: 4177 /// 4178 /// #reduce_elem refers to an element in the local lane's data structure 4179 /// #remote_elem is retrieved from a remote lane 4180 /// remote_elem = shuffle_down(reduce_elem, offset, WARPSIZE); 4181 /// reduce_elem = reduce_elem REDUCE_OP remote_elem; 4182 /// 4183 /// Contiguous Partial Warp Reduction 4184 /// 4185 /// This reduce algorithm is used within a warp where only the first 4186 /// 'n' (n <= WARPSIZE) lanes are active. It is typically used when the 4187 /// number of OpenMP threads in a parallel region is not a multiple of 4188 /// WARPSIZE. The algorithm is implemented in the runtime as follows: 4189 /// 4190 /// void 4191 /// contiguous_partial_reduce(void *reduce_data, 4192 /// kmp_ShuffleReductFctPtr ShuffleReduceFn, 4193 /// int size, int lane_id) { 4194 /// int curr_size; 4195 /// int offset; 4196 /// curr_size = size; 4197 /// mask = curr_size/2; 4198 /// while (offset>0) { 4199 /// ShuffleReduceFn(reduce_data, lane_id, offset, 1); 4200 /// curr_size = (curr_size+1)/2; 4201 /// offset = curr_size/2; 4202 /// } 4203 /// } 4204 /// 4205 /// In this version, 'ShuffleReduceFn' behaves, per element, as follows: 4206 /// 4207 /// remote_elem = shuffle_down(reduce_elem, offset, WARPSIZE); 4208 /// if (lane_id < offset) 4209 /// reduce_elem = reduce_elem REDUCE_OP remote_elem 4210 /// else 4211 /// reduce_elem = remote_elem 4212 /// 4213 /// This algorithm assumes that the data to be reduced are located in a 4214 /// contiguous subset of lanes starting from the first. When there is 4215 /// an odd number of active lanes, the data in the last lane is not 4216 /// aggregated with any other lane's dat but is instead copied over. 4217 /// 4218 /// Dispersed Partial Warp Reduction 4219 /// 4220 /// This algorithm is used within a warp when any discontiguous subset of 4221 /// lanes are active. It is used to implement the reduction operation 4222 /// across lanes in an OpenMP simd region or in a nested parallel region. 4223 /// 4224 /// void 4225 /// dispersed_partial_reduce(void *reduce_data, 4226 /// kmp_ShuffleReductFctPtr ShuffleReduceFn) { 4227 /// int size, remote_id; 4228 /// int logical_lane_id = number_of_active_lanes_before_me() * 2; 4229 /// do { 4230 /// remote_id = next_active_lane_id_right_after_me(); 4231 /// # the above function returns 0 of no active lane 4232 /// # is present right after the current lane. 4233 /// size = number_of_active_lanes_in_this_warp(); 4234 /// logical_lane_id /= 2; 4235 /// ShuffleReduceFn(reduce_data, logical_lane_id, 4236 /// remote_id-1-threadIdx.x, 2); 4237 /// } while (logical_lane_id % 2 == 0 && size > 1); 4238 /// } 4239 /// 4240 /// There is no assumption made about the initial state of the reduction. 4241 /// Any number of lanes (>=1) could be active at any position. The reduction 4242 /// result is returned in the first active lane. 4243 /// 4244 /// In this version, 'ShuffleReduceFn' behaves, per element, as follows: 4245 /// 4246 /// remote_elem = shuffle_down(reduce_elem, offset, WARPSIZE); 4247 /// if (lane_id % 2 == 0 && offset > 0) 4248 /// reduce_elem = reduce_elem REDUCE_OP remote_elem 4249 /// else 4250 /// reduce_elem = remote_elem 4251 /// 4252 /// 4253 /// Intra-Team Reduction 4254 /// 4255 /// This function, as implemented in the runtime call 4256 /// '__kmpc_nvptx_parallel_reduce_nowait_v2', aggregates data across OpenMP 4257 /// threads in a team. It first reduces within a warp using the 4258 /// aforementioned algorithms. We then proceed to gather all such 4259 /// reduced values at the first warp. 4260 /// 4261 /// The runtime makes use of the function 'InterWarpCpyFn', which copies 4262 /// data from each of the "warp master" (zeroth lane of each warp, where 4263 /// warp-reduced data is held) to the zeroth warp. This step reduces (in 4264 /// a mathematical sense) the problem of reduction across warp masters in 4265 /// a block to the problem of warp reduction. 4266 /// 4267 /// 4268 /// Inter-Team Reduction 4269 /// 4270 /// Once a team has reduced its data to a single value, it is stored in 4271 /// a global scratchpad array. Since each team has a distinct slot, this 4272 /// can be done without locking. 4273 /// 4274 /// The last team to write to the scratchpad array proceeds to reduce the 4275 /// scratchpad array. One or more workers in the last team use the helper 4276 /// 'loadAndReduceDataFn' to load and reduce values from the array, i.e., 4277 /// the k'th worker reduces every k'th element. 4278 /// 4279 /// Finally, a call is made to '__kmpc_nvptx_parallel_reduce_nowait_v2' to 4280 /// reduce across workers and compute a globally reduced value. 4281 /// 4282 void CGOpenMPRuntimeGPU::emitReduction( 4283 CodeGenFunction &CGF, SourceLocation Loc, ArrayRef<const Expr *> Privates, 4284 ArrayRef<const Expr *> LHSExprs, ArrayRef<const Expr *> RHSExprs, 4285 ArrayRef<const Expr *> ReductionOps, ReductionOptionsTy Options) { 4286 if (!CGF.HaveInsertPoint()) 4287 return; 4288 4289 bool ParallelReduction = isOpenMPParallelDirective(Options.ReductionKind); 4290 #ifndef NDEBUG 4291 bool TeamsReduction = isOpenMPTeamsDirective(Options.ReductionKind); 4292 #endif 4293 4294 if (Options.SimpleReduction) { 4295 assert(!TeamsReduction && !ParallelReduction && 4296 "Invalid reduction selection in emitReduction."); 4297 CGOpenMPRuntime::emitReduction(CGF, Loc, Privates, LHSExprs, RHSExprs, 4298 ReductionOps, Options); 4299 return; 4300 } 4301 4302 assert((TeamsReduction || ParallelReduction) && 4303 "Invalid reduction selection in emitReduction."); 4304 4305 // Build res = __kmpc_reduce{_nowait}(<gtid>, <n>, sizeof(RedList), 4306 // RedList, shuffle_reduce_func, interwarp_copy_func); 4307 // or 4308 // Build res = __kmpc_reduce_teams_nowait_simple(<loc>, <gtid>, <lck>); 4309 llvm::Value *RTLoc = emitUpdateLocation(CGF, Loc); 4310 llvm::Value *ThreadId = getThreadID(CGF, Loc); 4311 4312 llvm::Value *Res; 4313 ASTContext &C = CGM.getContext(); 4314 // 1. Build a list of reduction variables. 4315 // void *RedList[<n>] = {<ReductionVars>[0], ..., <ReductionVars>[<n>-1]}; 4316 auto Size = RHSExprs.size(); 4317 for (const Expr *E : Privates) { 4318 if (E->getType()->isVariablyModifiedType()) 4319 // Reserve place for array size. 4320 ++Size; 4321 } 4322 llvm::APInt ArraySize(/*unsigned int numBits=*/32, Size); 4323 QualType ReductionArrayTy = 4324 C.getConstantArrayType(C.VoidPtrTy, ArraySize, nullptr, ArrayType::Normal, 4325 /*IndexTypeQuals=*/0); 4326 Address ReductionList = 4327 CGF.CreateMemTemp(ReductionArrayTy, ".omp.reduction.red_list"); 4328 auto IPriv = Privates.begin(); 4329 unsigned Idx = 0; 4330 for (unsigned I = 0, E = RHSExprs.size(); I < E; ++I, ++IPriv, ++Idx) { 4331 Address Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); 4332 CGF.Builder.CreateStore( 4333 CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( 4334 CGF.EmitLValue(RHSExprs[I]).getPointer(CGF), CGF.VoidPtrTy), 4335 Elem); 4336 if ((*IPriv)->getType()->isVariablyModifiedType()) { 4337 // Store array size. 4338 ++Idx; 4339 Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); 4340 llvm::Value *Size = CGF.Builder.CreateIntCast( 4341 CGF.getVLASize( 4342 CGF.getContext().getAsVariableArrayType((*IPriv)->getType())) 4343 .NumElts, 4344 CGF.SizeTy, /*isSigned=*/false); 4345 CGF.Builder.CreateStore(CGF.Builder.CreateIntToPtr(Size, CGF.VoidPtrTy), 4346 Elem); 4347 } 4348 } 4349 4350 llvm::Value *RL = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( 4351 ReductionList.getPointer(), CGF.VoidPtrTy); 4352 llvm::Function *ReductionFn = emitReductionFunction( 4353 Loc, CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo(), Privates, 4354 LHSExprs, RHSExprs, ReductionOps); 4355 llvm::Value *ReductionArrayTySize = CGF.getTypeSize(ReductionArrayTy); 4356 llvm::Function *ShuffleAndReduceFn = emitShuffleAndReduceFunction( 4357 CGM, Privates, ReductionArrayTy, ReductionFn, Loc); 4358 llvm::Value *InterWarpCopyFn = 4359 emitInterWarpCopyFunction(CGM, Privates, ReductionArrayTy, Loc); 4360 4361 if (ParallelReduction) { 4362 llvm::Value *Args[] = {RTLoc, 4363 ThreadId, 4364 CGF.Builder.getInt32(RHSExprs.size()), 4365 ReductionArrayTySize, 4366 RL, 4367 ShuffleAndReduceFn, 4368 InterWarpCopyFn}; 4369 4370 Res = CGF.EmitRuntimeCall( 4371 createNVPTXRuntimeFunction( 4372 OMPRTL_NVPTX__kmpc_nvptx_parallel_reduce_nowait_v2), 4373 Args); 4374 } else { 4375 assert(TeamsReduction && "expected teams reduction."); 4376 llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> VarFieldMap; 4377 llvm::SmallVector<const ValueDecl *, 4> PrivatesReductions(Privates.size()); 4378 int Cnt = 0; 4379 for (const Expr *DRE : Privates) { 4380 PrivatesReductions[Cnt] = cast<DeclRefExpr>(DRE)->getDecl(); 4381 ++Cnt; 4382 } 4383 const RecordDecl *TeamReductionRec = ::buildRecordForGlobalizedVars( 4384 CGM.getContext(), PrivatesReductions, llvm::None, VarFieldMap, 4385 C.getLangOpts().OpenMPCUDAReductionBufNum); 4386 TeamsReductions.push_back(TeamReductionRec); 4387 if (!KernelTeamsReductionPtr) { 4388 KernelTeamsReductionPtr = new llvm::GlobalVariable( 4389 CGM.getModule(), CGM.VoidPtrTy, /*isConstant=*/true, 4390 llvm::GlobalValue::InternalLinkage, nullptr, 4391 "_openmp_teams_reductions_buffer_$_$ptr"); 4392 } 4393 llvm::Value *GlobalBufferPtr = CGF.EmitLoadOfScalar( 4394 Address(KernelTeamsReductionPtr, CGM.getPointerAlign()), 4395 /*Volatile=*/false, C.getPointerType(C.VoidPtrTy), Loc); 4396 llvm::Value *GlobalToBufferCpyFn = ::emitListToGlobalCopyFunction( 4397 CGM, Privates, ReductionArrayTy, Loc, TeamReductionRec, VarFieldMap); 4398 llvm::Value *GlobalToBufferRedFn = ::emitListToGlobalReduceFunction( 4399 CGM, Privates, ReductionArrayTy, Loc, TeamReductionRec, VarFieldMap, 4400 ReductionFn); 4401 llvm::Value *BufferToGlobalCpyFn = ::emitGlobalToListCopyFunction( 4402 CGM, Privates, ReductionArrayTy, Loc, TeamReductionRec, VarFieldMap); 4403 llvm::Value *BufferToGlobalRedFn = ::emitGlobalToListReduceFunction( 4404 CGM, Privates, ReductionArrayTy, Loc, TeamReductionRec, VarFieldMap, 4405 ReductionFn); 4406 4407 llvm::Value *Args[] = { 4408 RTLoc, 4409 ThreadId, 4410 GlobalBufferPtr, 4411 CGF.Builder.getInt32(C.getLangOpts().OpenMPCUDAReductionBufNum), 4412 RL, 4413 ShuffleAndReduceFn, 4414 InterWarpCopyFn, 4415 GlobalToBufferCpyFn, 4416 GlobalToBufferRedFn, 4417 BufferToGlobalCpyFn, 4418 BufferToGlobalRedFn}; 4419 4420 Res = CGF.EmitRuntimeCall( 4421 createNVPTXRuntimeFunction( 4422 OMPRTL_NVPTX__kmpc_nvptx_teams_reduce_nowait_v2), 4423 Args); 4424 } 4425 4426 // 5. Build if (res == 1) 4427 llvm::BasicBlock *ExitBB = CGF.createBasicBlock(".omp.reduction.done"); 4428 llvm::BasicBlock *ThenBB = CGF.createBasicBlock(".omp.reduction.then"); 4429 llvm::Value *Cond = CGF.Builder.CreateICmpEQ( 4430 Res, llvm::ConstantInt::get(CGM.Int32Ty, /*V=*/1)); 4431 CGF.Builder.CreateCondBr(Cond, ThenBB, ExitBB); 4432 4433 // 6. Build then branch: where we have reduced values in the master 4434 // thread in each team. 4435 // __kmpc_end_reduce{_nowait}(<gtid>); 4436 // break; 4437 CGF.EmitBlock(ThenBB); 4438 4439 // Add emission of __kmpc_end_reduce{_nowait}(<gtid>); 4440 auto &&CodeGen = [Privates, LHSExprs, RHSExprs, ReductionOps, 4441 this](CodeGenFunction &CGF, PrePostActionTy &Action) { 4442 auto IPriv = Privates.begin(); 4443 auto ILHS = LHSExprs.begin(); 4444 auto IRHS = RHSExprs.begin(); 4445 for (const Expr *E : ReductionOps) { 4446 emitSingleReductionCombiner(CGF, E, *IPriv, cast<DeclRefExpr>(*ILHS), 4447 cast<DeclRefExpr>(*IRHS)); 4448 ++IPriv; 4449 ++ILHS; 4450 ++IRHS; 4451 } 4452 }; 4453 llvm::Value *EndArgs[] = {ThreadId}; 4454 RegionCodeGenTy RCG(CodeGen); 4455 NVPTXActionTy Action( 4456 nullptr, llvm::None, 4457 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_end_reduce_nowait), 4458 EndArgs); 4459 RCG.setAction(Action); 4460 RCG(CGF); 4461 // There is no need to emit line number for unconditional branch. 4462 (void)ApplyDebugLocation::CreateEmpty(CGF); 4463 CGF.EmitBlock(ExitBB, /*IsFinished=*/true); 4464 } 4465 4466 const VarDecl * 4467 CGOpenMPRuntimeGPU::translateParameter(const FieldDecl *FD, 4468 const VarDecl *NativeParam) const { 4469 if (!NativeParam->getType()->isReferenceType()) 4470 return NativeParam; 4471 QualType ArgType = NativeParam->getType(); 4472 QualifierCollector QC; 4473 const Type *NonQualTy = QC.strip(ArgType); 4474 QualType PointeeTy = cast<ReferenceType>(NonQualTy)->getPointeeType(); 4475 if (const auto *Attr = FD->getAttr<OMPCaptureKindAttr>()) { 4476 if (Attr->getCaptureKind() == OMPC_map) { 4477 PointeeTy = CGM.getContext().getAddrSpaceQualType(PointeeTy, 4478 LangAS::opencl_global); 4479 } else if (Attr->getCaptureKind() == OMPC_firstprivate && 4480 PointeeTy.isConstant(CGM.getContext())) { 4481 PointeeTy = CGM.getContext().getAddrSpaceQualType(PointeeTy, 4482 LangAS::opencl_generic); 4483 } 4484 } 4485 ArgType = CGM.getContext().getPointerType(PointeeTy); 4486 QC.addRestrict(); 4487 enum { NVPTX_local_addr = 5 }; 4488 QC.addAddressSpace(getLangASFromTargetAS(NVPTX_local_addr)); 4489 ArgType = QC.apply(CGM.getContext(), ArgType); 4490 if (isa<ImplicitParamDecl>(NativeParam)) 4491 return ImplicitParamDecl::Create( 4492 CGM.getContext(), /*DC=*/nullptr, NativeParam->getLocation(), 4493 NativeParam->getIdentifier(), ArgType, ImplicitParamDecl::Other); 4494 return ParmVarDecl::Create( 4495 CGM.getContext(), 4496 const_cast<DeclContext *>(NativeParam->getDeclContext()), 4497 NativeParam->getBeginLoc(), NativeParam->getLocation(), 4498 NativeParam->getIdentifier(), ArgType, 4499 /*TInfo=*/nullptr, SC_None, /*DefArg=*/nullptr); 4500 } 4501 4502 Address 4503 CGOpenMPRuntimeGPU::getParameterAddress(CodeGenFunction &CGF, 4504 const VarDecl *NativeParam, 4505 const VarDecl *TargetParam) const { 4506 assert(NativeParam != TargetParam && 4507 NativeParam->getType()->isReferenceType() && 4508 "Native arg must not be the same as target arg."); 4509 Address LocalAddr = CGF.GetAddrOfLocalVar(TargetParam); 4510 QualType NativeParamType = NativeParam->getType(); 4511 QualifierCollector QC; 4512 const Type *NonQualTy = QC.strip(NativeParamType); 4513 QualType NativePointeeTy = cast<ReferenceType>(NonQualTy)->getPointeeType(); 4514 unsigned NativePointeeAddrSpace = 4515 CGF.getContext().getTargetAddressSpace(NativePointeeTy); 4516 QualType TargetTy = TargetParam->getType(); 4517 llvm::Value *TargetAddr = CGF.EmitLoadOfScalar( 4518 LocalAddr, /*Volatile=*/false, TargetTy, SourceLocation()); 4519 // First cast to generic. 4520 TargetAddr = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( 4521 TargetAddr, TargetAddr->getType()->getPointerElementType()->getPointerTo( 4522 /*AddrSpace=*/0)); 4523 // Cast from generic to native address space. 4524 TargetAddr = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( 4525 TargetAddr, TargetAddr->getType()->getPointerElementType()->getPointerTo( 4526 NativePointeeAddrSpace)); 4527 Address NativeParamAddr = CGF.CreateMemTemp(NativeParamType); 4528 CGF.EmitStoreOfScalar(TargetAddr, NativeParamAddr, /*Volatile=*/false, 4529 NativeParamType); 4530 return NativeParamAddr; 4531 } 4532 4533 void CGOpenMPRuntimeGPU::emitOutlinedFunctionCall( 4534 CodeGenFunction &CGF, SourceLocation Loc, llvm::FunctionCallee OutlinedFn, 4535 ArrayRef<llvm::Value *> Args) const { 4536 SmallVector<llvm::Value *, 4> TargetArgs; 4537 TargetArgs.reserve(Args.size()); 4538 auto *FnType = OutlinedFn.getFunctionType(); 4539 for (unsigned I = 0, E = Args.size(); I < E; ++I) { 4540 if (FnType->isVarArg() && FnType->getNumParams() <= I) { 4541 TargetArgs.append(std::next(Args.begin(), I), Args.end()); 4542 break; 4543 } 4544 llvm::Type *TargetType = FnType->getParamType(I); 4545 llvm::Value *NativeArg = Args[I]; 4546 if (!TargetType->isPointerTy()) { 4547 TargetArgs.emplace_back(NativeArg); 4548 continue; 4549 } 4550 llvm::Value *TargetArg = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( 4551 NativeArg, 4552 NativeArg->getType()->getPointerElementType()->getPointerTo()); 4553 TargetArgs.emplace_back( 4554 CGF.Builder.CreatePointerBitCastOrAddrSpaceCast(TargetArg, TargetType)); 4555 } 4556 CGOpenMPRuntime::emitOutlinedFunctionCall(CGF, Loc, OutlinedFn, TargetArgs); 4557 } 4558 4559 /// Emit function which wraps the outline parallel region 4560 /// and controls the arguments which are passed to this function. 4561 /// The wrapper ensures that the outlined function is called 4562 /// with the correct arguments when data is shared. 4563 llvm::Function *CGOpenMPRuntimeGPU::createParallelDataSharingWrapper( 4564 llvm::Function *OutlinedParallelFn, const OMPExecutableDirective &D) { 4565 ASTContext &Ctx = CGM.getContext(); 4566 const auto &CS = *D.getCapturedStmt(OMPD_parallel); 4567 4568 // Create a function that takes as argument the source thread. 4569 FunctionArgList WrapperArgs; 4570 QualType Int16QTy = 4571 Ctx.getIntTypeForBitwidth(/*DestWidth=*/16, /*Signed=*/false); 4572 QualType Int32QTy = 4573 Ctx.getIntTypeForBitwidth(/*DestWidth=*/32, /*Signed=*/false); 4574 ImplicitParamDecl ParallelLevelArg(Ctx, /*DC=*/nullptr, D.getBeginLoc(), 4575 /*Id=*/nullptr, Int16QTy, 4576 ImplicitParamDecl::Other); 4577 ImplicitParamDecl WrapperArg(Ctx, /*DC=*/nullptr, D.getBeginLoc(), 4578 /*Id=*/nullptr, Int32QTy, 4579 ImplicitParamDecl::Other); 4580 WrapperArgs.emplace_back(&ParallelLevelArg); 4581 WrapperArgs.emplace_back(&WrapperArg); 4582 4583 const CGFunctionInfo &CGFI = 4584 CGM.getTypes().arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, WrapperArgs); 4585 4586 auto *Fn = llvm::Function::Create( 4587 CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, 4588 Twine(OutlinedParallelFn->getName(), "_wrapper"), &CGM.getModule()); 4589 CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); 4590 Fn->setLinkage(llvm::GlobalValue::InternalLinkage); 4591 Fn->setDoesNotRecurse(); 4592 4593 CodeGenFunction CGF(CGM, /*suppressNewContext=*/true); 4594 CGF.StartFunction(GlobalDecl(), Ctx.VoidTy, Fn, CGFI, WrapperArgs, 4595 D.getBeginLoc(), D.getBeginLoc()); 4596 4597 const auto *RD = CS.getCapturedRecordDecl(); 4598 auto CurField = RD->field_begin(); 4599 4600 Address ZeroAddr = CGF.CreateDefaultAlignTempAlloca(CGF.Int32Ty, 4601 /*Name=*/".zero.addr"); 4602 CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0)); 4603 // Get the array of arguments. 4604 SmallVector<llvm::Value *, 8> Args; 4605 4606 Args.emplace_back(CGF.GetAddrOfLocalVar(&WrapperArg).getPointer()); 4607 Args.emplace_back(ZeroAddr.getPointer()); 4608 4609 CGBuilderTy &Bld = CGF.Builder; 4610 auto CI = CS.capture_begin(); 4611 4612 // Use global memory for data sharing. 4613 // Handle passing of global args to workers. 4614 Address GlobalArgs = 4615 CGF.CreateDefaultAlignTempAlloca(CGF.VoidPtrPtrTy, "global_args"); 4616 llvm::Value *GlobalArgsPtr = GlobalArgs.getPointer(); 4617 llvm::Value *DataSharingArgs[] = {GlobalArgsPtr}; 4618 CGF.EmitRuntimeCall( 4619 createNVPTXRuntimeFunction(OMPRTL_NVPTX__kmpc_get_shared_variables), 4620 DataSharingArgs); 4621 4622 // Retrieve the shared variables from the list of references returned 4623 // by the runtime. Pass the variables to the outlined function. 4624 Address SharedArgListAddress = Address::invalid(); 4625 if (CS.capture_size() > 0 || 4626 isOpenMPLoopBoundSharingDirective(D.getDirectiveKind())) { 4627 SharedArgListAddress = CGF.EmitLoadOfPointer( 4628 GlobalArgs, CGF.getContext() 4629 .getPointerType(CGF.getContext().getPointerType( 4630 CGF.getContext().VoidPtrTy)) 4631 .castAs<PointerType>()); 4632 } 4633 unsigned Idx = 0; 4634 if (isOpenMPLoopBoundSharingDirective(D.getDirectiveKind())) { 4635 Address Src = Bld.CreateConstInBoundsGEP(SharedArgListAddress, Idx); 4636 Address TypedAddress = Bld.CreatePointerBitCastOrAddrSpaceCast( 4637 Src, CGF.SizeTy->getPointerTo()); 4638 llvm::Value *LB = CGF.EmitLoadOfScalar( 4639 TypedAddress, 4640 /*Volatile=*/false, 4641 CGF.getContext().getPointerType(CGF.getContext().getSizeType()), 4642 cast<OMPLoopDirective>(D).getLowerBoundVariable()->getExprLoc()); 4643 Args.emplace_back(LB); 4644 ++Idx; 4645 Src = Bld.CreateConstInBoundsGEP(SharedArgListAddress, Idx); 4646 TypedAddress = Bld.CreatePointerBitCastOrAddrSpaceCast( 4647 Src, CGF.SizeTy->getPointerTo()); 4648 llvm::Value *UB = CGF.EmitLoadOfScalar( 4649 TypedAddress, 4650 /*Volatile=*/false, 4651 CGF.getContext().getPointerType(CGF.getContext().getSizeType()), 4652 cast<OMPLoopDirective>(D).getUpperBoundVariable()->getExprLoc()); 4653 Args.emplace_back(UB); 4654 ++Idx; 4655 } 4656 if (CS.capture_size() > 0) { 4657 ASTContext &CGFContext = CGF.getContext(); 4658 for (unsigned I = 0, E = CS.capture_size(); I < E; ++I, ++CI, ++CurField) { 4659 QualType ElemTy = CurField->getType(); 4660 Address Src = Bld.CreateConstInBoundsGEP(SharedArgListAddress, I + Idx); 4661 Address TypedAddress = Bld.CreatePointerBitCastOrAddrSpaceCast( 4662 Src, CGF.ConvertTypeForMem(CGFContext.getPointerType(ElemTy))); 4663 llvm::Value *Arg = CGF.EmitLoadOfScalar(TypedAddress, 4664 /*Volatile=*/false, 4665 CGFContext.getPointerType(ElemTy), 4666 CI->getLocation()); 4667 if (CI->capturesVariableByCopy() && 4668 !CI->getCapturedVar()->getType()->isAnyPointerType()) { 4669 Arg = castValueToType(CGF, Arg, ElemTy, CGFContext.getUIntPtrType(), 4670 CI->getLocation()); 4671 } 4672 Args.emplace_back(Arg); 4673 } 4674 } 4675 4676 emitOutlinedFunctionCall(CGF, D.getBeginLoc(), OutlinedParallelFn, Args); 4677 CGF.FinishFunction(); 4678 return Fn; 4679 } 4680 4681 void CGOpenMPRuntimeGPU::emitFunctionProlog(CodeGenFunction &CGF, 4682 const Decl *D) { 4683 if (getDataSharingMode(CGM) != CGOpenMPRuntimeGPU::Generic) 4684 return; 4685 4686 assert(D && "Expected function or captured|block decl."); 4687 assert(FunctionGlobalizedDecls.count(CGF.CurFn) == 0 && 4688 "Function is registered already."); 4689 assert((!TeamAndReductions.first || TeamAndReductions.first == D) && 4690 "Team is set but not processed."); 4691 const Stmt *Body = nullptr; 4692 bool NeedToDelayGlobalization = false; 4693 if (const auto *FD = dyn_cast<FunctionDecl>(D)) { 4694 Body = FD->getBody(); 4695 } else if (const auto *BD = dyn_cast<BlockDecl>(D)) { 4696 Body = BD->getBody(); 4697 } else if (const auto *CD = dyn_cast<CapturedDecl>(D)) { 4698 Body = CD->getBody(); 4699 NeedToDelayGlobalization = CGF.CapturedStmtInfo->getKind() == CR_OpenMP; 4700 if (NeedToDelayGlobalization && 4701 getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) 4702 return; 4703 } 4704 if (!Body) 4705 return; 4706 CheckVarsEscapingDeclContext VarChecker(CGF, TeamAndReductions.second); 4707 VarChecker.Visit(Body); 4708 const RecordDecl *GlobalizedVarsRecord = 4709 VarChecker.getGlobalizedRecord(IsInTTDRegion); 4710 TeamAndReductions.first = nullptr; 4711 TeamAndReductions.second.clear(); 4712 ArrayRef<const ValueDecl *> EscapedVariableLengthDecls = 4713 VarChecker.getEscapedVariableLengthDecls(); 4714 if (!GlobalizedVarsRecord && EscapedVariableLengthDecls.empty()) 4715 return; 4716 auto I = FunctionGlobalizedDecls.try_emplace(CGF.CurFn).first; 4717 I->getSecond().MappedParams = 4718 std::make_unique<CodeGenFunction::OMPMapVars>(); 4719 I->getSecond().GlobalRecord = GlobalizedVarsRecord; 4720 I->getSecond().EscapedParameters.insert( 4721 VarChecker.getEscapedParameters().begin(), 4722 VarChecker.getEscapedParameters().end()); 4723 I->getSecond().EscapedVariableLengthDecls.append( 4724 EscapedVariableLengthDecls.begin(), EscapedVariableLengthDecls.end()); 4725 DeclToAddrMapTy &Data = I->getSecond().LocalVarData; 4726 for (const ValueDecl *VD : VarChecker.getEscapedDecls()) { 4727 assert(VD->isCanonicalDecl() && "Expected canonical declaration"); 4728 const FieldDecl *FD = VarChecker.getFieldForGlobalizedVar(VD); 4729 Data.insert(std::make_pair(VD, MappedVarData(FD, IsInTTDRegion))); 4730 } 4731 if (!IsInTTDRegion && !NeedToDelayGlobalization && !IsInParallelRegion) { 4732 CheckVarsEscapingDeclContext VarChecker(CGF, llvm::None); 4733 VarChecker.Visit(Body); 4734 I->getSecond().SecondaryGlobalRecord = 4735 VarChecker.getGlobalizedRecord(/*IsInTTDRegion=*/true); 4736 I->getSecond().SecondaryLocalVarData.emplace(); 4737 DeclToAddrMapTy &Data = I->getSecond().SecondaryLocalVarData.getValue(); 4738 for (const ValueDecl *VD : VarChecker.getEscapedDecls()) { 4739 assert(VD->isCanonicalDecl() && "Expected canonical declaration"); 4740 const FieldDecl *FD = VarChecker.getFieldForGlobalizedVar(VD); 4741 Data.insert( 4742 std::make_pair(VD, MappedVarData(FD, /*IsInTTDRegion=*/true))); 4743 } 4744 } 4745 if (!NeedToDelayGlobalization) { 4746 emitGenericVarsProlog(CGF, D->getBeginLoc(), /*WithSPMDCheck=*/true); 4747 struct GlobalizationScope final : EHScopeStack::Cleanup { 4748 GlobalizationScope() = default; 4749 4750 void Emit(CodeGenFunction &CGF, Flags flags) override { 4751 static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()) 4752 .emitGenericVarsEpilog(CGF, /*WithSPMDCheck=*/true); 4753 } 4754 }; 4755 CGF.EHStack.pushCleanup<GlobalizationScope>(NormalAndEHCleanup); 4756 } 4757 } 4758 4759 Address CGOpenMPRuntimeGPU::getAddressOfLocalVariable(CodeGenFunction &CGF, 4760 const VarDecl *VD) { 4761 if (VD && VD->hasAttr<OMPAllocateDeclAttr>()) { 4762 const auto *A = VD->getAttr<OMPAllocateDeclAttr>(); 4763 auto AS = LangAS::Default; 4764 switch (A->getAllocatorType()) { 4765 // Use the default allocator here as by default local vars are 4766 // threadlocal. 4767 case OMPAllocateDeclAttr::OMPNullMemAlloc: 4768 case OMPAllocateDeclAttr::OMPDefaultMemAlloc: 4769 case OMPAllocateDeclAttr::OMPThreadMemAlloc: 4770 case OMPAllocateDeclAttr::OMPHighBWMemAlloc: 4771 case OMPAllocateDeclAttr::OMPLowLatMemAlloc: 4772 // Follow the user decision - use default allocation. 4773 return Address::invalid(); 4774 case OMPAllocateDeclAttr::OMPUserDefinedMemAlloc: 4775 // TODO: implement aupport for user-defined allocators. 4776 return Address::invalid(); 4777 case OMPAllocateDeclAttr::OMPConstMemAlloc: 4778 AS = LangAS::cuda_constant; 4779 break; 4780 case OMPAllocateDeclAttr::OMPPTeamMemAlloc: 4781 AS = LangAS::cuda_shared; 4782 break; 4783 case OMPAllocateDeclAttr::OMPLargeCapMemAlloc: 4784 case OMPAllocateDeclAttr::OMPCGroupMemAlloc: 4785 break; 4786 } 4787 llvm::Type *VarTy = CGF.ConvertTypeForMem(VD->getType()); 4788 auto *GV = new llvm::GlobalVariable( 4789 CGM.getModule(), VarTy, /*isConstant=*/false, 4790 llvm::GlobalValue::InternalLinkage, llvm::Constant::getNullValue(VarTy), 4791 VD->getName(), 4792 /*InsertBefore=*/nullptr, llvm::GlobalValue::NotThreadLocal, 4793 CGM.getContext().getTargetAddressSpace(AS)); 4794 CharUnits Align = CGM.getContext().getDeclAlign(VD); 4795 GV->setAlignment(Align.getAsAlign()); 4796 return Address( 4797 CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( 4798 GV, VarTy->getPointerTo(CGM.getContext().getTargetAddressSpace( 4799 VD->getType().getAddressSpace()))), 4800 Align); 4801 } 4802 4803 if (getDataSharingMode(CGM) != CGOpenMPRuntimeGPU::Generic) 4804 return Address::invalid(); 4805 4806 VD = VD->getCanonicalDecl(); 4807 auto I = FunctionGlobalizedDecls.find(CGF.CurFn); 4808 if (I == FunctionGlobalizedDecls.end()) 4809 return Address::invalid(); 4810 auto VDI = I->getSecond().LocalVarData.find(VD); 4811 if (VDI != I->getSecond().LocalVarData.end()) 4812 return VDI->second.PrivateAddr; 4813 if (VD->hasAttrs()) { 4814 for (specific_attr_iterator<OMPReferencedVarAttr> IT(VD->attr_begin()), 4815 E(VD->attr_end()); 4816 IT != E; ++IT) { 4817 auto VDI = I->getSecond().LocalVarData.find( 4818 cast<VarDecl>(cast<DeclRefExpr>(IT->getRef())->getDecl()) 4819 ->getCanonicalDecl()); 4820 if (VDI != I->getSecond().LocalVarData.end()) 4821 return VDI->second.PrivateAddr; 4822 } 4823 } 4824 4825 return Address::invalid(); 4826 } 4827 4828 void CGOpenMPRuntimeGPU::functionFinished(CodeGenFunction &CGF) { 4829 FunctionGlobalizedDecls.erase(CGF.CurFn); 4830 CGOpenMPRuntime::functionFinished(CGF); 4831 } 4832 4833 void CGOpenMPRuntimeGPU::getDefaultDistScheduleAndChunk( 4834 CodeGenFunction &CGF, const OMPLoopDirective &S, 4835 OpenMPDistScheduleClauseKind &ScheduleKind, 4836 llvm::Value *&Chunk) const { 4837 auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); 4838 if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) { 4839 ScheduleKind = OMPC_DIST_SCHEDULE_static; 4840 Chunk = CGF.EmitScalarConversion( 4841 RT.getGPUNumThreads(CGF), 4842 CGF.getContext().getIntTypeForBitwidth(32, /*Signed=*/0), 4843 S.getIterationVariable()->getType(), S.getBeginLoc()); 4844 return; 4845 } 4846 CGOpenMPRuntime::getDefaultDistScheduleAndChunk( 4847 CGF, S, ScheduleKind, Chunk); 4848 } 4849 4850 void CGOpenMPRuntimeGPU::getDefaultScheduleAndChunk( 4851 CodeGenFunction &CGF, const OMPLoopDirective &S, 4852 OpenMPScheduleClauseKind &ScheduleKind, 4853 const Expr *&ChunkExpr) const { 4854 ScheduleKind = OMPC_SCHEDULE_static; 4855 // Chunk size is 1 in this case. 4856 llvm::APInt ChunkSize(32, 1); 4857 ChunkExpr = IntegerLiteral::Create(CGF.getContext(), ChunkSize, 4858 CGF.getContext().getIntTypeForBitwidth(32, /*Signed=*/0), 4859 SourceLocation()); 4860 } 4861 4862 void CGOpenMPRuntimeGPU::adjustTargetSpecificDataForLambdas( 4863 CodeGenFunction &CGF, const OMPExecutableDirective &D) const { 4864 assert(isOpenMPTargetExecutionDirective(D.getDirectiveKind()) && 4865 " Expected target-based directive."); 4866 const CapturedStmt *CS = D.getCapturedStmt(OMPD_target); 4867 for (const CapturedStmt::Capture &C : CS->captures()) { 4868 // Capture variables captured by reference in lambdas for target-based 4869 // directives. 4870 if (!C.capturesVariable()) 4871 continue; 4872 const VarDecl *VD = C.getCapturedVar(); 4873 const auto *RD = VD->getType() 4874 .getCanonicalType() 4875 .getNonReferenceType() 4876 ->getAsCXXRecordDecl(); 4877 if (!RD || !RD->isLambda()) 4878 continue; 4879 Address VDAddr = CGF.GetAddrOfLocalVar(VD); 4880 LValue VDLVal; 4881 if (VD->getType().getCanonicalType()->isReferenceType()) 4882 VDLVal = CGF.EmitLoadOfReferenceLValue(VDAddr, VD->getType()); 4883 else 4884 VDLVal = CGF.MakeAddrLValue( 4885 VDAddr, VD->getType().getCanonicalType().getNonReferenceType()); 4886 llvm::DenseMap<const VarDecl *, FieldDecl *> Captures; 4887 FieldDecl *ThisCapture = nullptr; 4888 RD->getCaptureFields(Captures, ThisCapture); 4889 if (ThisCapture && CGF.CapturedStmtInfo->isCXXThisExprCaptured()) { 4890 LValue ThisLVal = 4891 CGF.EmitLValueForFieldInitialization(VDLVal, ThisCapture); 4892 llvm::Value *CXXThis = CGF.LoadCXXThis(); 4893 CGF.EmitStoreOfScalar(CXXThis, ThisLVal); 4894 } 4895 for (const LambdaCapture &LC : RD->captures()) { 4896 if (LC.getCaptureKind() != LCK_ByRef) 4897 continue; 4898 const VarDecl *VD = LC.getCapturedVar(); 4899 if (!CS->capturesVariable(VD)) 4900 continue; 4901 auto It = Captures.find(VD); 4902 assert(It != Captures.end() && "Found lambda capture without field."); 4903 LValue VarLVal = CGF.EmitLValueForFieldInitialization(VDLVal, It->second); 4904 Address VDAddr = CGF.GetAddrOfLocalVar(VD); 4905 if (VD->getType().getCanonicalType()->isReferenceType()) 4906 VDAddr = CGF.EmitLoadOfReferenceLValue(VDAddr, 4907 VD->getType().getCanonicalType()) 4908 .getAddress(CGF); 4909 CGF.EmitStoreOfScalar(VDAddr.getPointer(), VarLVal); 4910 } 4911 } 4912 } 4913 4914 unsigned CGOpenMPRuntimeGPU::getDefaultFirstprivateAddressSpace() const { 4915 return CGM.getContext().getTargetAddressSpace(LangAS::cuda_constant); 4916 } 4917 4918 bool CGOpenMPRuntimeGPU::hasAllocateAttributeForGlobalVar(const VarDecl *VD, 4919 LangAS &AS) { 4920 if (!VD || !VD->hasAttr<OMPAllocateDeclAttr>()) 4921 return false; 4922 const auto *A = VD->getAttr<OMPAllocateDeclAttr>(); 4923 switch(A->getAllocatorType()) { 4924 case OMPAllocateDeclAttr::OMPNullMemAlloc: 4925 case OMPAllocateDeclAttr::OMPDefaultMemAlloc: 4926 // Not supported, fallback to the default mem space. 4927 case OMPAllocateDeclAttr::OMPThreadMemAlloc: 4928 case OMPAllocateDeclAttr::OMPLargeCapMemAlloc: 4929 case OMPAllocateDeclAttr::OMPCGroupMemAlloc: 4930 case OMPAllocateDeclAttr::OMPHighBWMemAlloc: 4931 case OMPAllocateDeclAttr::OMPLowLatMemAlloc: 4932 AS = LangAS::Default; 4933 return true; 4934 case OMPAllocateDeclAttr::OMPConstMemAlloc: 4935 AS = LangAS::cuda_constant; 4936 return true; 4937 case OMPAllocateDeclAttr::OMPPTeamMemAlloc: 4938 AS = LangAS::cuda_shared; 4939 return true; 4940 case OMPAllocateDeclAttr::OMPUserDefinedMemAlloc: 4941 llvm_unreachable("Expected predefined allocator for the variables with the " 4942 "static storage."); 4943 } 4944 return false; 4945 } 4946 4947 // Get current CudaArch and ignore any unknown values 4948 static CudaArch getCudaArch(CodeGenModule &CGM) { 4949 if (!CGM.getTarget().hasFeature("ptx")) 4950 return CudaArch::UNKNOWN; 4951 for (const auto &Feature : CGM.getTarget().getTargetOpts().FeatureMap) { 4952 if (Feature.getValue()) { 4953 CudaArch Arch = StringToCudaArch(Feature.getKey()); 4954 if (Arch != CudaArch::UNKNOWN) 4955 return Arch; 4956 } 4957 } 4958 return CudaArch::UNKNOWN; 4959 } 4960 4961 /// Check to see if target architecture supports unified addressing which is 4962 /// a restriction for OpenMP requires clause "unified_shared_memory". 4963 void CGOpenMPRuntimeGPU::processRequiresDirective( 4964 const OMPRequiresDecl *D) { 4965 for (const OMPClause *Clause : D->clauselists()) { 4966 if (Clause->getClauseKind() == OMPC_unified_shared_memory) { 4967 CudaArch Arch = getCudaArch(CGM); 4968 switch (Arch) { 4969 case CudaArch::SM_20: 4970 case CudaArch::SM_21: 4971 case CudaArch::SM_30: 4972 case CudaArch::SM_32: 4973 case CudaArch::SM_35: 4974 case CudaArch::SM_37: 4975 case CudaArch::SM_50: 4976 case CudaArch::SM_52: 4977 case CudaArch::SM_53: 4978 case CudaArch::SM_60: 4979 case CudaArch::SM_61: 4980 case CudaArch::SM_62: { 4981 SmallString<256> Buffer; 4982 llvm::raw_svector_ostream Out(Buffer); 4983 Out << "Target architecture " << CudaArchToString(Arch) 4984 << " does not support unified addressing"; 4985 CGM.Error(Clause->getBeginLoc(), Out.str()); 4986 return; 4987 } 4988 case CudaArch::SM_70: 4989 case CudaArch::SM_72: 4990 case CudaArch::SM_75: 4991 case CudaArch::SM_80: 4992 case CudaArch::GFX600: 4993 case CudaArch::GFX601: 4994 case CudaArch::GFX700: 4995 case CudaArch::GFX701: 4996 case CudaArch::GFX702: 4997 case CudaArch::GFX703: 4998 case CudaArch::GFX704: 4999 case CudaArch::GFX801: 5000 case CudaArch::GFX802: 5001 case CudaArch::GFX803: 5002 case CudaArch::GFX810: 5003 case CudaArch::GFX900: 5004 case CudaArch::GFX902: 5005 case CudaArch::GFX904: 5006 case CudaArch::GFX906: 5007 case CudaArch::GFX908: 5008 case CudaArch::GFX909: 5009 case CudaArch::GFX1010: 5010 case CudaArch::GFX1011: 5011 case CudaArch::GFX1012: 5012 case CudaArch::GFX1030: 5013 case CudaArch::GFX1031: 5014 case CudaArch::UNKNOWN: 5015 break; 5016 case CudaArch::LAST: 5017 llvm_unreachable("Unexpected Cuda arch."); 5018 } 5019 } 5020 } 5021 CGOpenMPRuntime::processRequiresDirective(D); 5022 } 5023 5024 /// Get number of SMs and number of blocks per SM. 5025 static std::pair<unsigned, unsigned> getSMsBlocksPerSM(CodeGenModule &CGM) { 5026 std::pair<unsigned, unsigned> Data; 5027 if (CGM.getLangOpts().OpenMPCUDANumSMs) 5028 Data.first = CGM.getLangOpts().OpenMPCUDANumSMs; 5029 if (CGM.getLangOpts().OpenMPCUDABlocksPerSM) 5030 Data.second = CGM.getLangOpts().OpenMPCUDABlocksPerSM; 5031 if (Data.first && Data.second) 5032 return Data; 5033 switch (getCudaArch(CGM)) { 5034 case CudaArch::SM_20: 5035 case CudaArch::SM_21: 5036 case CudaArch::SM_30: 5037 case CudaArch::SM_32: 5038 case CudaArch::SM_35: 5039 case CudaArch::SM_37: 5040 case CudaArch::SM_50: 5041 case CudaArch::SM_52: 5042 case CudaArch::SM_53: 5043 return {16, 16}; 5044 case CudaArch::SM_60: 5045 case CudaArch::SM_61: 5046 case CudaArch::SM_62: 5047 return {56, 32}; 5048 case CudaArch::SM_70: 5049 case CudaArch::SM_72: 5050 case CudaArch::SM_75: 5051 case CudaArch::SM_80: 5052 return {84, 32}; 5053 case CudaArch::GFX600: 5054 case CudaArch::GFX601: 5055 case CudaArch::GFX700: 5056 case CudaArch::GFX701: 5057 case CudaArch::GFX702: 5058 case CudaArch::GFX703: 5059 case CudaArch::GFX704: 5060 case CudaArch::GFX801: 5061 case CudaArch::GFX802: 5062 case CudaArch::GFX803: 5063 case CudaArch::GFX810: 5064 case CudaArch::GFX900: 5065 case CudaArch::GFX902: 5066 case CudaArch::GFX904: 5067 case CudaArch::GFX906: 5068 case CudaArch::GFX908: 5069 case CudaArch::GFX909: 5070 case CudaArch::GFX1010: 5071 case CudaArch::GFX1011: 5072 case CudaArch::GFX1012: 5073 case CudaArch::GFX1030: 5074 case CudaArch::GFX1031: 5075 case CudaArch::UNKNOWN: 5076 break; 5077 case CudaArch::LAST: 5078 llvm_unreachable("Unexpected Cuda arch."); 5079 } 5080 llvm_unreachable("Unexpected NVPTX target without ptx feature."); 5081 } 5082 5083 void CGOpenMPRuntimeGPU::clear() { 5084 if (!GlobalizedRecords.empty() && 5085 !CGM.getLangOpts().OpenMPCUDATargetParallel) { 5086 ASTContext &C = CGM.getContext(); 5087 llvm::SmallVector<const GlobalPtrSizeRecsTy *, 4> GlobalRecs; 5088 llvm::SmallVector<const GlobalPtrSizeRecsTy *, 4> SharedRecs; 5089 RecordDecl *StaticRD = C.buildImplicitRecord( 5090 "_openmp_static_memory_type_$_", RecordDecl::TagKind::TTK_Union); 5091 StaticRD->startDefinition(); 5092 RecordDecl *SharedStaticRD = C.buildImplicitRecord( 5093 "_shared_openmp_static_memory_type_$_", RecordDecl::TagKind::TTK_Union); 5094 SharedStaticRD->startDefinition(); 5095 for (const GlobalPtrSizeRecsTy &Records : GlobalizedRecords) { 5096 if (Records.Records.empty()) 5097 continue; 5098 unsigned Size = 0; 5099 unsigned RecAlignment = 0; 5100 for (const RecordDecl *RD : Records.Records) { 5101 QualType RDTy = C.getRecordType(RD); 5102 unsigned Alignment = C.getTypeAlignInChars(RDTy).getQuantity(); 5103 RecAlignment = std::max(RecAlignment, Alignment); 5104 unsigned RecSize = C.getTypeSizeInChars(RDTy).getQuantity(); 5105 Size = 5106 llvm::alignTo(llvm::alignTo(Size, Alignment) + RecSize, Alignment); 5107 } 5108 Size = llvm::alignTo(Size, RecAlignment); 5109 llvm::APInt ArySize(/*numBits=*/64, Size); 5110 QualType SubTy = C.getConstantArrayType( 5111 C.CharTy, ArySize, nullptr, ArrayType::Normal, /*IndexTypeQuals=*/0); 5112 const bool UseSharedMemory = Size <= SharedMemorySize; 5113 auto *Field = 5114 FieldDecl::Create(C, UseSharedMemory ? SharedStaticRD : StaticRD, 5115 SourceLocation(), SourceLocation(), nullptr, SubTy, 5116 C.getTrivialTypeSourceInfo(SubTy, SourceLocation()), 5117 /*BW=*/nullptr, /*Mutable=*/false, 5118 /*InitStyle=*/ICIS_NoInit); 5119 Field->setAccess(AS_public); 5120 if (UseSharedMemory) { 5121 SharedStaticRD->addDecl(Field); 5122 SharedRecs.push_back(&Records); 5123 } else { 5124 StaticRD->addDecl(Field); 5125 GlobalRecs.push_back(&Records); 5126 } 5127 Records.RecSize->setInitializer(llvm::ConstantInt::get(CGM.SizeTy, Size)); 5128 Records.UseSharedMemory->setInitializer( 5129 llvm::ConstantInt::get(CGM.Int16Ty, UseSharedMemory ? 1 : 0)); 5130 } 5131 // Allocate SharedMemorySize buffer for the shared memory. 5132 // FIXME: nvlink does not handle weak linkage correctly (object with the 5133 // different size are reported as erroneous). 5134 // Restore this code as sson as nvlink is fixed. 5135 if (!SharedStaticRD->field_empty()) { 5136 llvm::APInt ArySize(/*numBits=*/64, SharedMemorySize); 5137 QualType SubTy = C.getConstantArrayType( 5138 C.CharTy, ArySize, nullptr, ArrayType::Normal, /*IndexTypeQuals=*/0); 5139 auto *Field = FieldDecl::Create( 5140 C, SharedStaticRD, SourceLocation(), SourceLocation(), nullptr, SubTy, 5141 C.getTrivialTypeSourceInfo(SubTy, SourceLocation()), 5142 /*BW=*/nullptr, /*Mutable=*/false, 5143 /*InitStyle=*/ICIS_NoInit); 5144 Field->setAccess(AS_public); 5145 SharedStaticRD->addDecl(Field); 5146 } 5147 SharedStaticRD->completeDefinition(); 5148 if (!SharedStaticRD->field_empty()) { 5149 QualType StaticTy = C.getRecordType(SharedStaticRD); 5150 llvm::Type *LLVMStaticTy = CGM.getTypes().ConvertTypeForMem(StaticTy); 5151 auto *GV = new llvm::GlobalVariable( 5152 CGM.getModule(), LLVMStaticTy, 5153 /*isConstant=*/false, llvm::GlobalValue::CommonLinkage, 5154 llvm::Constant::getNullValue(LLVMStaticTy), 5155 "_openmp_shared_static_glob_rd_$_", /*InsertBefore=*/nullptr, 5156 llvm::GlobalValue::NotThreadLocal, 5157 C.getTargetAddressSpace(LangAS::cuda_shared)); 5158 auto *Replacement = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast( 5159 GV, CGM.VoidPtrTy); 5160 for (const GlobalPtrSizeRecsTy *Rec : SharedRecs) { 5161 Rec->Buffer->replaceAllUsesWith(Replacement); 5162 Rec->Buffer->eraseFromParent(); 5163 } 5164 } 5165 StaticRD->completeDefinition(); 5166 if (!StaticRD->field_empty()) { 5167 QualType StaticTy = C.getRecordType(StaticRD); 5168 std::pair<unsigned, unsigned> SMsBlockPerSM = getSMsBlocksPerSM(CGM); 5169 llvm::APInt Size1(32, SMsBlockPerSM.second); 5170 QualType Arr1Ty = 5171 C.getConstantArrayType(StaticTy, Size1, nullptr, ArrayType::Normal, 5172 /*IndexTypeQuals=*/0); 5173 llvm::APInt Size2(32, SMsBlockPerSM.first); 5174 QualType Arr2Ty = 5175 C.getConstantArrayType(Arr1Ty, Size2, nullptr, ArrayType::Normal, 5176 /*IndexTypeQuals=*/0); 5177 llvm::Type *LLVMArr2Ty = CGM.getTypes().ConvertTypeForMem(Arr2Ty); 5178 // FIXME: nvlink does not handle weak linkage correctly (object with the 5179 // different size are reported as erroneous). 5180 // Restore CommonLinkage as soon as nvlink is fixed. 5181 auto *GV = new llvm::GlobalVariable( 5182 CGM.getModule(), LLVMArr2Ty, 5183 /*isConstant=*/false, llvm::GlobalValue::InternalLinkage, 5184 llvm::Constant::getNullValue(LLVMArr2Ty), 5185 "_openmp_static_glob_rd_$_"); 5186 auto *Replacement = llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast( 5187 GV, CGM.VoidPtrTy); 5188 for (const GlobalPtrSizeRecsTy *Rec : GlobalRecs) { 5189 Rec->Buffer->replaceAllUsesWith(Replacement); 5190 Rec->Buffer->eraseFromParent(); 5191 } 5192 } 5193 } 5194 if (!TeamsReductions.empty()) { 5195 ASTContext &C = CGM.getContext(); 5196 RecordDecl *StaticRD = C.buildImplicitRecord( 5197 "_openmp_teams_reduction_type_$_", RecordDecl::TagKind::TTK_Union); 5198 StaticRD->startDefinition(); 5199 for (const RecordDecl *TeamReductionRec : TeamsReductions) { 5200 QualType RecTy = C.getRecordType(TeamReductionRec); 5201 auto *Field = FieldDecl::Create( 5202 C, StaticRD, SourceLocation(), SourceLocation(), nullptr, RecTy, 5203 C.getTrivialTypeSourceInfo(RecTy, SourceLocation()), 5204 /*BW=*/nullptr, /*Mutable=*/false, 5205 /*InitStyle=*/ICIS_NoInit); 5206 Field->setAccess(AS_public); 5207 StaticRD->addDecl(Field); 5208 } 5209 StaticRD->completeDefinition(); 5210 QualType StaticTy = C.getRecordType(StaticRD); 5211 llvm::Type *LLVMReductionsBufferTy = 5212 CGM.getTypes().ConvertTypeForMem(StaticTy); 5213 // FIXME: nvlink does not handle weak linkage correctly (object with the 5214 // different size are reported as erroneous). 5215 // Restore CommonLinkage as soon as nvlink is fixed. 5216 auto *GV = new llvm::GlobalVariable( 5217 CGM.getModule(), LLVMReductionsBufferTy, 5218 /*isConstant=*/false, llvm::GlobalValue::InternalLinkage, 5219 llvm::Constant::getNullValue(LLVMReductionsBufferTy), 5220 "_openmp_teams_reductions_buffer_$_"); 5221 KernelTeamsReductionPtr->setInitializer( 5222 llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, 5223 CGM.VoidPtrTy)); 5224 } 5225 CGOpenMPRuntime::clear(); 5226 } 5227