1 //===-- SystemZInstrInfo.h - SystemZ instruction information ----*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains the SystemZ implementation of the TargetInstrInfo class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZINSTRINFO_H 15 #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZINSTRINFO_H 16 17 #include "SystemZ.h" 18 #include "SystemZRegisterInfo.h" 19 #include "llvm/ADT/ArrayRef.h" 20 #include "llvm/CodeGen/MachineBasicBlock.h" 21 #include "llvm/CodeGen/MachineFunction.h" 22 #include "llvm/CodeGen/MachineInstrBuilder.h" 23 #include "llvm/CodeGen/TargetInstrInfo.h" 24 #include <cstdint> 25 26 #define GET_INSTRINFO_HEADER 27 #include "SystemZGenInstrInfo.inc" 28 29 namespace llvm { 30 31 class SystemZSubtarget; 32 33 namespace SystemZII { 34 35 enum { 36 // See comments in SystemZInstrFormats.td. 37 SimpleBDXLoad = (1 << 0), 38 SimpleBDXStore = (1 << 1), 39 Has20BitOffset = (1 << 2), 40 HasIndex = (1 << 3), 41 Is128Bit = (1 << 4), 42 AccessSizeMask = (31 << 5), 43 AccessSizeShift = 5, 44 CCValuesMask = (15 << 10), 45 CCValuesShift = 10, 46 CompareZeroCCMaskMask = (15 << 14), 47 CompareZeroCCMaskShift = 14, 48 CCMaskFirst = (1 << 18), 49 CCMaskLast = (1 << 19), 50 IsLogical = (1 << 20) 51 }; 52 53 static inline unsigned getAccessSize(unsigned int Flags) { 54 return (Flags & AccessSizeMask) >> AccessSizeShift; 55 } 56 57 static inline unsigned getCCValues(unsigned int Flags) { 58 return (Flags & CCValuesMask) >> CCValuesShift; 59 } 60 61 static inline unsigned getCompareZeroCCMask(unsigned int Flags) { 62 return (Flags & CompareZeroCCMaskMask) >> CompareZeroCCMaskShift; 63 } 64 65 // SystemZ MachineOperand target flags. 66 enum { 67 // Masks out the bits for the access model. 68 MO_SYMBOL_MODIFIER = (3 << 0), 69 70 // @GOT (aka @GOTENT) 71 MO_GOT = (1 << 0), 72 73 // @INDNTPOFF 74 MO_INDNTPOFF = (2 << 0) 75 }; 76 77 // Classifies a branch. 78 enum BranchType { 79 // An instruction that branches on the current value of CC. 80 BranchNormal, 81 82 // An instruction that peforms a 32-bit signed comparison and branches 83 // on the result. 84 BranchC, 85 86 // An instruction that peforms a 32-bit unsigned comparison and branches 87 // on the result. 88 BranchCL, 89 90 // An instruction that peforms a 64-bit signed comparison and branches 91 // on the result. 92 BranchCG, 93 94 // An instruction that peforms a 64-bit unsigned comparison and branches 95 // on the result. 96 BranchCLG, 97 98 // An instruction that decrements a 32-bit register and branches if 99 // the result is nonzero. 100 BranchCT, 101 102 // An instruction that decrements a 64-bit register and branches if 103 // the result is nonzero. 104 BranchCTG 105 }; 106 107 // Information about a branch instruction. 108 struct Branch { 109 // The type of the branch. 110 BranchType Type; 111 112 // CCMASK_<N> is set if CC might be equal to N. 113 unsigned CCValid; 114 115 // CCMASK_<N> is set if the branch should be taken when CC == N. 116 unsigned CCMask; 117 118 // The target of the branch. 119 const MachineOperand *Target; 120 121 Branch(BranchType type, unsigned ccValid, unsigned ccMask, 122 const MachineOperand *target) 123 : Type(type), CCValid(ccValid), CCMask(ccMask), Target(target) {} 124 }; 125 126 // Kinds of fused compares in compare-and-* instructions. Together with type 127 // of the converted compare, this identifies the compare-and-* 128 // instruction. 129 enum FusedCompareType { 130 // Relative branch - CRJ etc. 131 CompareAndBranch, 132 133 // Indirect branch, used for return - CRBReturn etc. 134 CompareAndReturn, 135 136 // Indirect branch, used for sibcall - CRBCall etc. 137 CompareAndSibcall, 138 139 // Trap 140 CompareAndTrap 141 }; 142 143 } // end namespace SystemZII 144 145 class SystemZInstrInfo : public SystemZGenInstrInfo { 146 const SystemZRegisterInfo RI; 147 SystemZSubtarget &STI; 148 149 void splitMove(MachineBasicBlock::iterator MI, unsigned NewOpcode) const; 150 void splitAdjDynAlloc(MachineBasicBlock::iterator MI) const; 151 void expandRIPseudo(MachineInstr &MI, unsigned LowOpcode, unsigned HighOpcode, 152 bool ConvertHigh) const; 153 void expandRIEPseudo(MachineInstr &MI, unsigned LowOpcode, 154 unsigned LowOpcodeK, unsigned HighOpcode) const; 155 void expandRXYPseudo(MachineInstr &MI, unsigned LowOpcode, 156 unsigned HighOpcode) const; 157 void expandLOCPseudo(MachineInstr &MI, unsigned LowOpcode, 158 unsigned HighOpcode) const; 159 void expandLOCRPseudo(MachineInstr &MI, unsigned LowOpcode, 160 unsigned HighOpcode) const; 161 void expandZExtPseudo(MachineInstr &MI, unsigned LowOpcode, 162 unsigned Size) const; 163 void expandLoadStackGuard(MachineInstr *MI) const; 164 165 MachineInstrBuilder 166 emitGRX32Move(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, 167 const DebugLoc &DL, unsigned DestReg, unsigned SrcReg, 168 unsigned LowLowOpcode, unsigned Size, bool KillSrc, 169 bool UndefSrc) const; 170 171 virtual void anchor(); 172 173 protected: 174 /// Commutes the operands in the given instruction by changing the operands 175 /// order and/or changing the instruction's opcode and/or the immediate value 176 /// operand. 177 /// 178 /// The arguments 'CommuteOpIdx1' and 'CommuteOpIdx2' specify the operands 179 /// to be commuted. 180 /// 181 /// Do not call this method for a non-commutable instruction or 182 /// non-commutable operands. 183 /// Even though the instruction is commutable, the method may still 184 /// fail to commute the operands, null pointer is returned in such cases. 185 MachineInstr *commuteInstructionImpl(MachineInstr &MI, bool NewMI, 186 unsigned CommuteOpIdx1, 187 unsigned CommuteOpIdx2) const override; 188 189 public: 190 explicit SystemZInstrInfo(SystemZSubtarget &STI); 191 192 // Override TargetInstrInfo. 193 unsigned isLoadFromStackSlot(const MachineInstr &MI, 194 int &FrameIndex) const override; 195 unsigned isStoreToStackSlot(const MachineInstr &MI, 196 int &FrameIndex) const override; 197 bool isStackSlotCopy(const MachineInstr &MI, int &DestFrameIndex, 198 int &SrcFrameIndex) const override; 199 bool analyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB, 200 MachineBasicBlock *&FBB, 201 SmallVectorImpl<MachineOperand> &Cond, 202 bool AllowModify) const override; 203 unsigned removeBranch(MachineBasicBlock &MBB, 204 int *BytesRemoved = nullptr) const override; 205 unsigned insertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB, 206 MachineBasicBlock *FBB, ArrayRef<MachineOperand> Cond, 207 const DebugLoc &DL, 208 int *BytesAdded = nullptr) const override; 209 bool analyzeCompare(const MachineInstr &MI, unsigned &SrcReg, 210 unsigned &SrcReg2, int &Mask, int &Value) const override; 211 bool canInsertSelect(const MachineBasicBlock&, ArrayRef<MachineOperand> Cond, 212 unsigned, unsigned, int&, int&, int&) const override; 213 void insertSelect(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, 214 const DebugLoc &DL, unsigned DstReg, 215 ArrayRef<MachineOperand> Cond, unsigned TrueReg, 216 unsigned FalseReg) const override; 217 bool FoldImmediate(MachineInstr &UseMI, MachineInstr &DefMI, unsigned Reg, 218 MachineRegisterInfo *MRI) const override; 219 bool isPredicable(const MachineInstr &MI) const override; 220 bool isProfitableToIfCvt(MachineBasicBlock &MBB, unsigned NumCycles, 221 unsigned ExtraPredCycles, 222 BranchProbability Probability) const override; 223 bool isProfitableToIfCvt(MachineBasicBlock &TMBB, 224 unsigned NumCyclesT, unsigned ExtraPredCyclesT, 225 MachineBasicBlock &FMBB, 226 unsigned NumCyclesF, unsigned ExtraPredCyclesF, 227 BranchProbability Probability) const override; 228 bool isProfitableToDupForIfCvt(MachineBasicBlock &MBB, unsigned NumCycles, 229 BranchProbability Probability) const override; 230 bool PredicateInstruction(MachineInstr &MI, 231 ArrayRef<MachineOperand> Pred) const override; 232 void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, 233 const DebugLoc &DL, unsigned DestReg, unsigned SrcReg, 234 bool KillSrc) const override; 235 void storeRegToStackSlot(MachineBasicBlock &MBB, 236 MachineBasicBlock::iterator MBBI, 237 unsigned SrcReg, bool isKill, int FrameIndex, 238 const TargetRegisterClass *RC, 239 const TargetRegisterInfo *TRI) const override; 240 void loadRegFromStackSlot(MachineBasicBlock &MBB, 241 MachineBasicBlock::iterator MBBI, 242 unsigned DestReg, int FrameIdx, 243 const TargetRegisterClass *RC, 244 const TargetRegisterInfo *TRI) const override; 245 MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI, 246 MachineInstr &MI, 247 LiveVariables *LV) const override; 248 MachineInstr * 249 foldMemoryOperandImpl(MachineFunction &MF, MachineInstr &MI, 250 ArrayRef<unsigned> Ops, 251 MachineBasicBlock::iterator InsertPt, int FrameIndex, 252 LiveIntervals *LIS = nullptr) const override; 253 MachineInstr *foldMemoryOperandImpl( 254 MachineFunction &MF, MachineInstr &MI, ArrayRef<unsigned> Ops, 255 MachineBasicBlock::iterator InsertPt, MachineInstr &LoadMI, 256 LiveIntervals *LIS = nullptr) const override; 257 bool expandPostRAPseudo(MachineInstr &MBBI) const override; 258 bool reverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const 259 override; 260 261 // Return the SystemZRegisterInfo, which this class owns. 262 const SystemZRegisterInfo &getRegisterInfo() const { return RI; } 263 264 // Return the size in bytes of MI. 265 unsigned getInstSizeInBytes(const MachineInstr &MI) const override; 266 267 // Return true if MI is a conditional or unconditional branch. 268 // When returning true, set Cond to the mask of condition-code 269 // values on which the instruction will branch, and set Target 270 // to the operand that contains the branch target. This target 271 // can be a register or a basic block. 272 SystemZII::Branch getBranchInfo(const MachineInstr &MI) const; 273 274 // Get the load and store opcodes for a given register class. 275 void getLoadStoreOpcodes(const TargetRegisterClass *RC, 276 unsigned &LoadOpcode, unsigned &StoreOpcode) const; 277 278 // Opcode is the opcode of an instruction that has an address operand, 279 // and the caller wants to perform that instruction's operation on an 280 // address that has displacement Offset. Return the opcode of a suitable 281 // instruction (which might be Opcode itself) or 0 if no such instruction 282 // exists. 283 unsigned getOpcodeForOffset(unsigned Opcode, int64_t Offset) const; 284 285 // If Opcode is a load instruction that has a LOAD AND TEST form, 286 // return the opcode for the testing form, otherwise return 0. 287 unsigned getLoadAndTest(unsigned Opcode) const; 288 289 // Return true if ROTATE AND ... SELECTED BITS can be used to select bits 290 // Mask of the R2 operand, given that only the low BitSize bits of Mask are 291 // significant. Set Start and End to the I3 and I4 operands if so. 292 bool isRxSBGMask(uint64_t Mask, unsigned BitSize, 293 unsigned &Start, unsigned &End) const; 294 295 // If Opcode is a COMPARE opcode for which an associated fused COMPARE AND * 296 // operation exists, return the opcode for the latter, otherwise return 0. 297 // MI, if nonnull, is the compare instruction. 298 unsigned getFusedCompare(unsigned Opcode, 299 SystemZII::FusedCompareType Type, 300 const MachineInstr *MI = nullptr) const; 301 302 // If Opcode is a LOAD opcode for with an associated LOAD AND TRAP 303 // operation exists, returh the opcode for the latter, otherwise return 0. 304 unsigned getLoadAndTrap(unsigned Opcode) const; 305 306 // Emit code before MBBI in MI to move immediate value Value into 307 // physical register Reg. 308 void loadImmediate(MachineBasicBlock &MBB, 309 MachineBasicBlock::iterator MBBI, 310 unsigned Reg, uint64_t Value) const; 311 312 // Sometimes, it is possible for the target to tell, even without 313 // aliasing information, that two MIs access different memory 314 // addresses. This function returns true if two MIs access different 315 // memory addresses and false otherwise. 316 bool 317 areMemAccessesTriviallyDisjoint(MachineInstr &MIa, MachineInstr &MIb, 318 AliasAnalysis *AA = nullptr) const override; 319 }; 320 321 } // end namespace llvm 322 323 #endif // LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZINSTRINFO_H 324