1 //===-- llvm/CodeGen/GlobalISel/MachineIRBuilder.cpp - MIBuilder--*- 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 /// \file
10 /// This file implements the MachineIRBuidler class.
11 //===----------------------------------------------------------------------===//
12 #include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
13 
14 #include "llvm/CodeGen/MachineFunction.h"
15 #include "llvm/CodeGen/MachineInstr.h"
16 #include "llvm/CodeGen/MachineInstrBuilder.h"
17 #include "llvm/CodeGen/MachineRegisterInfo.h"
18 #include "llvm/IR/DebugInfo.h"
19 #include "llvm/Target/TargetInstrInfo.h"
20 #include "llvm/Target/TargetOpcodes.h"
21 #include "llvm/Target/TargetSubtargetInfo.h"
22 
23 using namespace llvm;
24 
25 void MachineIRBuilder::setMF(MachineFunction &MF) {
26   this->MF = &MF;
27   this->MBB = nullptr;
28   this->MRI = &MF.getRegInfo();
29   this->TII = MF.getSubtarget().getInstrInfo();
30   this->DL = DebugLoc();
31   this->II = MachineBasicBlock::iterator();
32   this->InsertedInstr = nullptr;
33 }
34 
35 void MachineIRBuilder::setMBB(MachineBasicBlock &MBB) {
36   this->MBB = &MBB;
37   this->II = MBB.end();
38   assert(&getMF() == MBB.getParent() &&
39          "Basic block is in a different function");
40 }
41 
42 void MachineIRBuilder::setInstr(MachineInstr &MI) {
43   assert(MI.getParent() && "Instruction is not part of a basic block");
44   setMBB(*MI.getParent());
45   this->II = MI.getIterator();
46 }
47 
48 void MachineIRBuilder::setInsertPt(MachineBasicBlock &MBB,
49                                    MachineBasicBlock::iterator II) {
50   assert(MBB.getParent() == &getMF() &&
51          "Basic block is in a different function");
52   this->MBB = &MBB;
53   this->II = II;
54 }
55 
56 void MachineIRBuilder::recordInsertions(
57     std::function<void(MachineInstr *)> Inserted) {
58   InsertedInstr = std::move(Inserted);
59 }
60 
61 void MachineIRBuilder::stopRecordingInsertions() {
62   InsertedInstr = nullptr;
63 }
64 
65 //------------------------------------------------------------------------------
66 // Build instruction variants.
67 //------------------------------------------------------------------------------
68 
69 MachineInstrBuilder MachineIRBuilder::buildInstr(unsigned Opcode) {
70   return insertInstr(buildInstrNoInsert(Opcode));
71 }
72 
73 MachineInstrBuilder MachineIRBuilder::buildInstrNoInsert(unsigned Opcode) {
74   MachineInstrBuilder MIB = BuildMI(getMF(), DL, getTII().get(Opcode));
75   return MIB;
76 }
77 
78 
79 MachineInstrBuilder MachineIRBuilder::insertInstr(MachineInstrBuilder MIB) {
80   getMBB().insert(getInsertPt(), MIB);
81   if (InsertedInstr)
82     InsertedInstr(MIB);
83   return MIB;
84 }
85 
86 MachineInstrBuilder MachineIRBuilder::buildDirectDbgValue(
87     unsigned Reg, const MDNode *Variable, const MDNode *Expr) {
88   assert(isa<DILocalVariable>(Variable) && "not a variable");
89   assert(cast<DIExpression>(Expr)->isValid() && "not an expression");
90   assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&
91          "Expected inlined-at fields to agree");
92   return buildInstr(TargetOpcode::DBG_VALUE)
93       .addReg(Reg, RegState::Debug)
94       .addReg(0, RegState::Debug)
95       .addMetadata(Variable)
96       .addMetadata(Expr);
97 }
98 
99 MachineInstrBuilder
100 MachineIRBuilder::buildIndirectDbgValue(unsigned Reg, const MDNode *Variable,
101                                         const MDNode *Expr) {
102   assert(isa<DILocalVariable>(Variable) && "not a variable");
103   assert(cast<DIExpression>(Expr)->isValid() && "not an expression");
104   assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&
105          "Expected inlined-at fields to agree");
106   return buildInstr(TargetOpcode::DBG_VALUE)
107       .addReg(Reg, RegState::Debug)
108       .addImm(0)
109       .addMetadata(Variable)
110       .addMetadata(Expr);
111 }
112 
113 MachineInstrBuilder MachineIRBuilder::buildFIDbgValue(int FI,
114                                                       const MDNode *Variable,
115                                                       const MDNode *Expr) {
116   assert(isa<DILocalVariable>(Variable) && "not a variable");
117   assert(cast<DIExpression>(Expr)->isValid() && "not an expression");
118   assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&
119          "Expected inlined-at fields to agree");
120   return buildInstr(TargetOpcode::DBG_VALUE)
121       .addFrameIndex(FI)
122       .addImm(0)
123       .addMetadata(Variable)
124       .addMetadata(Expr);
125 }
126 
127 MachineInstrBuilder MachineIRBuilder::buildConstDbgValue(const Constant &C,
128                                                          const MDNode *Variable,
129                                                          const MDNode *Expr) {
130   assert(isa<DILocalVariable>(Variable) && "not a variable");
131   assert(cast<DIExpression>(Expr)->isValid() && "not an expression");
132   assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&
133          "Expected inlined-at fields to agree");
134   auto MIB = buildInstr(TargetOpcode::DBG_VALUE);
135   if (auto *CI = dyn_cast<ConstantInt>(&C)) {
136     if (CI->getBitWidth() > 64)
137       MIB.addCImm(CI);
138     else
139       MIB.addImm(CI->getZExtValue());
140   } else if (auto *CFP = dyn_cast<ConstantFP>(&C)) {
141     MIB.addFPImm(CFP);
142   } else {
143     // Insert %noreg if we didn't find a usable constant and had to drop it.
144     MIB.addReg(0U);
145   }
146 
147   return MIB.addImm(0).addMetadata(Variable).addMetadata(Expr);
148 }
149 
150 MachineInstrBuilder MachineIRBuilder::buildFrameIndex(unsigned Res, int Idx) {
151   assert(MRI->getType(Res).isPointer() && "invalid operand type");
152   return buildInstr(TargetOpcode::G_FRAME_INDEX)
153       .addDef(Res)
154       .addFrameIndex(Idx);
155 }
156 
157 MachineInstrBuilder MachineIRBuilder::buildGlobalValue(unsigned Res,
158                                                        const GlobalValue *GV) {
159   assert(MRI->getType(Res).isPointer() && "invalid operand type");
160   assert(MRI->getType(Res).getAddressSpace() ==
161              GV->getType()->getAddressSpace() &&
162          "address space mismatch");
163 
164   return buildInstr(TargetOpcode::G_GLOBAL_VALUE)
165       .addDef(Res)
166       .addGlobalAddress(GV);
167 }
168 
169 MachineInstrBuilder MachineIRBuilder::buildBinaryOp(unsigned Opcode, unsigned Res, unsigned Op0,
170                                                unsigned Op1) {
171   assert((MRI->getType(Res).isScalar() || MRI->getType(Res).isVector()) &&
172          "invalid operand type");
173   assert(MRI->getType(Res) == MRI->getType(Op0) &&
174          MRI->getType(Res) == MRI->getType(Op1) && "type mismatch");
175 
176   return buildInstr(Opcode)
177       .addDef(Res)
178       .addUse(Op0)
179       .addUse(Op1);
180 }
181 
182 MachineInstrBuilder MachineIRBuilder::buildAdd(unsigned Res, unsigned Op0,
183                                                unsigned Op1) {
184   return buildBinaryOp(TargetOpcode::G_ADD, Res, Op0, Op1);
185 }
186 
187 MachineInstrBuilder MachineIRBuilder::buildGEP(unsigned Res, unsigned Op0,
188                                                unsigned Op1) {
189   assert(MRI->getType(Res).isPointer() &&
190          MRI->getType(Res) == MRI->getType(Op0) && "type mismatch");
191   assert(MRI->getType(Op1).isScalar()  && "invalid offset type");
192 
193   return buildInstr(TargetOpcode::G_GEP)
194       .addDef(Res)
195       .addUse(Op0)
196       .addUse(Op1);
197 }
198 
199 Optional<MachineInstrBuilder>
200 MachineIRBuilder::materializeGEP(unsigned &Res, unsigned Op0,
201                                  const LLT &ValueTy, uint64_t Value) {
202   assert(Res == 0 && "Res is a result argument");
203   assert(ValueTy.isScalar()  && "invalid offset type");
204 
205   if (Value == 0) {
206     Res = Op0;
207     return None;
208   }
209 
210   Res = MRI->createGenericVirtualRegister(MRI->getType(Op0));
211   unsigned TmpReg = MRI->createGenericVirtualRegister(ValueTy);
212 
213   buildConstant(TmpReg, Value);
214   return buildGEP(Res, Op0, TmpReg);
215 }
216 
217 MachineInstrBuilder MachineIRBuilder::buildPtrMask(unsigned Res, unsigned Op0,
218                                                    uint32_t NumBits) {
219   assert(MRI->getType(Res).isPointer() &&
220          MRI->getType(Res) == MRI->getType(Op0) && "type mismatch");
221 
222   return buildInstr(TargetOpcode::G_PTR_MASK)
223       .addDef(Res)
224       .addUse(Op0)
225       .addImm(NumBits);
226 }
227 
228 MachineInstrBuilder MachineIRBuilder::buildSub(unsigned Res, unsigned Op0,
229                                                unsigned Op1) {
230   return buildBinaryOp(TargetOpcode::G_SUB, Res, Op0, Op1);
231 }
232 
233 MachineInstrBuilder MachineIRBuilder::buildMul(unsigned Res, unsigned Op0,
234                                                unsigned Op1) {
235   return buildBinaryOp(TargetOpcode::G_MUL, Res, Op0, Op1);
236 }
237 
238 MachineInstrBuilder MachineIRBuilder::buildAnd(unsigned Res, unsigned Op0,
239                                                unsigned Op1) {
240   return buildBinaryOp(TargetOpcode::G_AND, Res, Op0, Op1);
241 }
242 
243 MachineInstrBuilder MachineIRBuilder::buildOr(unsigned Res, unsigned Op0,
244                                               unsigned Op1) {
245   return buildBinaryOp(TargetOpcode::G_OR, Res, Op0, Op1);
246 }
247 
248 MachineInstrBuilder MachineIRBuilder::buildBr(MachineBasicBlock &Dest) {
249   return buildInstr(TargetOpcode::G_BR).addMBB(&Dest);
250 }
251 
252 MachineInstrBuilder MachineIRBuilder::buildBrIndirect(unsigned Tgt) {
253   assert(MRI->getType(Tgt).isPointer() && "invalid branch destination");
254   return buildInstr(TargetOpcode::G_BRINDIRECT).addUse(Tgt);
255 }
256 
257 MachineInstrBuilder MachineIRBuilder::buildCopy(unsigned Res, unsigned Op) {
258   assert(MRI->getType(Res) == LLT() || MRI->getType(Op) == LLT() ||
259          MRI->getType(Res) == MRI->getType(Op));
260   return buildInstr(TargetOpcode::COPY).addDef(Res).addUse(Op);
261 }
262 
263 MachineInstrBuilder MachineIRBuilder::buildConstant(unsigned Res,
264                                                     const ConstantInt &Val) {
265   LLT Ty = MRI->getType(Res);
266 
267   assert((Ty.isScalar() || Ty.isPointer()) && "invalid operand type");
268 
269   const ConstantInt *NewVal = &Val;
270   if (Ty.getSizeInBits() != Val.getBitWidth())
271     NewVal = ConstantInt::get(MF->getFunction()->getContext(),
272                               Val.getValue().sextOrTrunc(Ty.getSizeInBits()));
273 
274   return buildInstr(TargetOpcode::G_CONSTANT).addDef(Res).addCImm(NewVal);
275 }
276 
277 MachineInstrBuilder MachineIRBuilder::buildConstant(unsigned Res,
278                                                     int64_t Val) {
279   auto IntN = IntegerType::get(MF->getFunction()->getContext(),
280                                MRI->getType(Res).getSizeInBits());
281   ConstantInt *CI = ConstantInt::get(IntN, Val, true);
282   return buildConstant(Res, *CI);
283 }
284 
285 MachineInstrBuilder MachineIRBuilder::buildFConstant(unsigned Res,
286                                                      const ConstantFP &Val) {
287   assert(MRI->getType(Res).isScalar() && "invalid operand type");
288 
289   return buildInstr(TargetOpcode::G_FCONSTANT).addDef(Res).addFPImm(&Val);
290 }
291 
292 MachineInstrBuilder MachineIRBuilder::buildBrCond(unsigned Tst,
293                                                   MachineBasicBlock &Dest) {
294   assert(MRI->getType(Tst).isScalar() && "invalid operand type");
295 
296   return buildInstr(TargetOpcode::G_BRCOND).addUse(Tst).addMBB(&Dest);
297 }
298 
299 MachineInstrBuilder MachineIRBuilder::buildLoad(unsigned Res, unsigned Addr,
300                                                 MachineMemOperand &MMO) {
301   assert(MRI->getType(Res).isValid() && "invalid operand type");
302   assert(MRI->getType(Addr).isPointer() && "invalid operand type");
303 
304   return buildInstr(TargetOpcode::G_LOAD)
305       .addDef(Res)
306       .addUse(Addr)
307       .addMemOperand(&MMO);
308 }
309 
310 MachineInstrBuilder MachineIRBuilder::buildStore(unsigned Val, unsigned Addr,
311                                                  MachineMemOperand &MMO) {
312   assert(MRI->getType(Val).isValid() && "invalid operand type");
313   assert(MRI->getType(Addr).isPointer() && "invalid operand type");
314 
315   return buildInstr(TargetOpcode::G_STORE)
316       .addUse(Val)
317       .addUse(Addr)
318       .addMemOperand(&MMO);
319 }
320 
321 MachineInstrBuilder MachineIRBuilder::buildUAdde(unsigned Res,
322                                                  unsigned CarryOut,
323                                                  unsigned Op0, unsigned Op1,
324                                                  unsigned CarryIn) {
325   assert(MRI->getType(Res).isScalar() && "invalid operand type");
326   assert(MRI->getType(Res) == MRI->getType(Op0) &&
327          MRI->getType(Res) == MRI->getType(Op1) && "type mismatch");
328   assert(MRI->getType(CarryOut).isScalar() && "invalid operand type");
329   assert(MRI->getType(CarryOut) == MRI->getType(CarryIn) && "type mismatch");
330 
331   return buildInstr(TargetOpcode::G_UADDE)
332       .addDef(Res)
333       .addDef(CarryOut)
334       .addUse(Op0)
335       .addUse(Op1)
336       .addUse(CarryIn);
337 }
338 
339 MachineInstrBuilder MachineIRBuilder::buildAnyExt(unsigned Res, unsigned Op) {
340   validateTruncExt(Res, Op, true);
341   return buildInstr(TargetOpcode::G_ANYEXT).addDef(Res).addUse(Op);
342 }
343 
344 MachineInstrBuilder MachineIRBuilder::buildSExt(unsigned Res, unsigned Op) {
345   validateTruncExt(Res, Op, true);
346   return buildInstr(TargetOpcode::G_SEXT).addDef(Res).addUse(Op);
347 }
348 
349 MachineInstrBuilder MachineIRBuilder::buildZExt(unsigned Res, unsigned Op) {
350   validateTruncExt(Res, Op, true);
351   return buildInstr(TargetOpcode::G_ZEXT).addDef(Res).addUse(Op);
352 }
353 
354 MachineInstrBuilder MachineIRBuilder::buildSExtOrTrunc(unsigned Res,
355                                                        unsigned Op) {
356   assert(MRI->getType(Res).isScalar() || MRI->getType(Res).isVector());
357   assert(MRI->getType(Res).isScalar() == MRI->getType(Op).isScalar());
358 
359   unsigned Opcode = TargetOpcode::COPY;
360   if (MRI->getType(Res).getSizeInBits() > MRI->getType(Op).getSizeInBits())
361     Opcode = TargetOpcode::G_SEXT;
362   else if (MRI->getType(Res).getSizeInBits() < MRI->getType(Op).getSizeInBits())
363     Opcode = TargetOpcode::G_TRUNC;
364   else
365     assert(MRI->getType(Res) == MRI->getType(Op));
366 
367   return buildInstr(Opcode).addDef(Res).addUse(Op);
368 }
369 
370 MachineInstrBuilder MachineIRBuilder::buildZExtOrTrunc(unsigned Res,
371                                                        unsigned Op) {
372   assert(MRI->getType(Res).isScalar() || MRI->getType(Res).isVector());
373   assert(MRI->getType(Res).isScalar() == MRI->getType(Op).isScalar());
374 
375   unsigned Opcode = TargetOpcode::COPY;
376   if (MRI->getType(Res).getSizeInBits() > MRI->getType(Op).getSizeInBits())
377     Opcode = TargetOpcode::G_ZEXT;
378   else if (MRI->getType(Res).getSizeInBits() < MRI->getType(Op).getSizeInBits())
379     Opcode = TargetOpcode::G_TRUNC;
380   else
381     assert(MRI->getType(Res) == MRI->getType(Op));
382 
383   return buildInstr(Opcode).addDef(Res).addUse(Op);
384 }
385 
386 MachineInstrBuilder MachineIRBuilder::buildCast(unsigned Dst, unsigned Src) {
387   LLT SrcTy = MRI->getType(Src);
388   LLT DstTy = MRI->getType(Dst);
389   if (SrcTy == DstTy)
390     return buildCopy(Dst, Src);
391 
392   unsigned Opcode;
393   if (SrcTy.isPointer() && DstTy.isScalar())
394     Opcode = TargetOpcode::G_PTRTOINT;
395   else if (DstTy.isPointer() && SrcTy.isScalar())
396     Opcode = TargetOpcode::G_INTTOPTR;
397   else {
398     assert(!SrcTy.isPointer() && !DstTy.isPointer() && "n G_ADDRCAST yet");
399     Opcode = TargetOpcode::G_BITCAST;
400   }
401 
402   return buildInstr(Opcode).addDef(Dst).addUse(Src);
403 }
404 
405 MachineInstrBuilder MachineIRBuilder::buildExtract(unsigned Res, unsigned Src,
406                                                    uint64_t Index) {
407 #ifndef NDEBUG
408   assert(MRI->getType(Src).isValid() && "invalid operand type");
409   assert(MRI->getType(Res).isValid() && "invalid operand type");
410   assert(Index + MRI->getType(Res).getSizeInBits() <=
411              MRI->getType(Src).getSizeInBits() &&
412          "extracting off end of register");
413 #endif
414 
415   if (MRI->getType(Res).getSizeInBits() == MRI->getType(Src).getSizeInBits()) {
416     assert(Index == 0 && "insertion past the end of a register");
417     return buildCast(Res, Src);
418   }
419 
420   return buildInstr(TargetOpcode::G_EXTRACT)
421       .addDef(Res)
422       .addUse(Src)
423       .addImm(Index);
424 }
425 
426 void MachineIRBuilder::buildSequence(unsigned Res, ArrayRef<unsigned> Ops,
427                                      ArrayRef<uint64_t> Indices) {
428 #ifndef NDEBUG
429   assert(Ops.size() == Indices.size() && "incompatible args");
430   assert(!Ops.empty() && "invalid trivial sequence");
431   assert(std::is_sorted(Indices.begin(), Indices.end()) &&
432          "sequence offsets must be in ascending order");
433 
434   assert(MRI->getType(Res).isValid() && "invalid operand type");
435   for (auto Op : Ops)
436     assert(MRI->getType(Op).isValid() && "invalid operand type");
437 #endif
438 
439   LLT ResTy = MRI->getType(Res);
440   LLT OpTy = MRI->getType(Ops[0]);
441   unsigned OpSize = OpTy.getSizeInBits();
442   bool MaybeMerge = true;
443   for (unsigned i = 0; i < Ops.size(); ++i) {
444     if (MRI->getType(Ops[i]) != OpTy || Indices[i] != i * OpSize) {
445       MaybeMerge = false;
446       break;
447     }
448   }
449 
450   if (MaybeMerge && Ops.size() * OpSize == ResTy.getSizeInBits()) {
451     buildMerge(Res, Ops);
452     return;
453   }
454 
455   unsigned ResIn = MRI->createGenericVirtualRegister(ResTy);
456   buildUndef(ResIn);
457 
458   for (unsigned i = 0; i < Ops.size(); ++i) {
459     unsigned ResOut =
460         i + 1 == Ops.size() ? Res : MRI->createGenericVirtualRegister(ResTy);
461     buildInsert(ResOut, ResIn, Ops[i], Indices[i]);
462     ResIn = ResOut;
463   }
464 }
465 
466 MachineInstrBuilder MachineIRBuilder::buildUndef(unsigned Res) {
467   return buildInstr(TargetOpcode::G_IMPLICIT_DEF).addDef(Res);
468 }
469 
470 MachineInstrBuilder MachineIRBuilder::buildMerge(unsigned Res,
471                                                  ArrayRef<unsigned> Ops) {
472 
473 #ifndef NDEBUG
474   assert(!Ops.empty() && "invalid trivial sequence");
475   LLT Ty = MRI->getType(Ops[0]);
476   for (auto Reg : Ops)
477     assert(MRI->getType(Reg) == Ty && "type mismatch in input list");
478   assert(Ops.size() * MRI->getType(Ops[0]).getSizeInBits() ==
479              MRI->getType(Res).getSizeInBits() &&
480          "input operands do not cover output register");
481 #endif
482 
483   if (Ops.size() == 1)
484     return buildCast(Res, Ops[0]);
485 
486   MachineInstrBuilder MIB = buildInstr(TargetOpcode::G_MERGE_VALUES);
487   MIB.addDef(Res);
488   for (unsigned i = 0; i < Ops.size(); ++i)
489     MIB.addUse(Ops[i]);
490   return MIB;
491 }
492 
493 MachineInstrBuilder MachineIRBuilder::buildUnmerge(ArrayRef<unsigned> Res,
494                                                    unsigned Op) {
495 
496 #ifndef NDEBUG
497   assert(!Res.empty() && "invalid trivial sequence");
498   LLT Ty = MRI->getType(Res[0]);
499   for (auto Reg : Res)
500     assert(MRI->getType(Reg) == Ty && "type mismatch in input list");
501   assert(Res.size() * MRI->getType(Res[0]).getSizeInBits() ==
502              MRI->getType(Op).getSizeInBits() &&
503          "input operands do not cover output register");
504 #endif
505 
506   MachineInstrBuilder MIB = buildInstr(TargetOpcode::G_UNMERGE_VALUES);
507   for (unsigned i = 0; i < Res.size(); ++i)
508     MIB.addDef(Res[i]);
509   MIB.addUse(Op);
510   return MIB;
511 }
512 
513 MachineInstrBuilder MachineIRBuilder::buildInsert(unsigned Res, unsigned Src,
514                                                   unsigned Op, unsigned Index) {
515   assert(Index + MRI->getType(Op).getSizeInBits() <=
516              MRI->getType(Res).getSizeInBits() &&
517          "insertion past the end of a register");
518 
519   if (MRI->getType(Res).getSizeInBits() == MRI->getType(Op).getSizeInBits()) {
520     return buildCast(Res, Op);
521   }
522 
523   return buildInstr(TargetOpcode::G_INSERT)
524       .addDef(Res)
525       .addUse(Src)
526       .addUse(Op)
527       .addImm(Index);
528 }
529 
530 MachineInstrBuilder MachineIRBuilder::buildIntrinsic(Intrinsic::ID ID,
531                                                      unsigned Res,
532                                                      bool HasSideEffects) {
533   auto MIB =
534       buildInstr(HasSideEffects ? TargetOpcode::G_INTRINSIC_W_SIDE_EFFECTS
535                                 : TargetOpcode::G_INTRINSIC);
536   if (Res)
537     MIB.addDef(Res);
538   MIB.addIntrinsicID(ID);
539   return MIB;
540 }
541 
542 MachineInstrBuilder MachineIRBuilder::buildTrunc(unsigned Res, unsigned Op) {
543   validateTruncExt(Res, Op, false);
544   return buildInstr(TargetOpcode::G_TRUNC).addDef(Res).addUse(Op);
545 }
546 
547 MachineInstrBuilder MachineIRBuilder::buildFPTrunc(unsigned Res, unsigned Op) {
548   validateTruncExt(Res, Op, false);
549   return buildInstr(TargetOpcode::G_FPTRUNC).addDef(Res).addUse(Op);
550 }
551 
552 MachineInstrBuilder MachineIRBuilder::buildICmp(CmpInst::Predicate Pred,
553                                                 unsigned Res, unsigned Op0,
554                                                 unsigned Op1) {
555 #ifndef NDEBUG
556   assert(MRI->getType(Op0) == MRI->getType(Op0) && "type mismatch");
557   assert(CmpInst::isIntPredicate(Pred) && "invalid predicate");
558   if (MRI->getType(Op0).isScalar() || MRI->getType(Op0).isPointer())
559     assert(MRI->getType(Res).isScalar() && "type mismatch");
560   else
561     assert(MRI->getType(Res).isVector() &&
562            MRI->getType(Res).getNumElements() ==
563                MRI->getType(Op0).getNumElements() &&
564            "type mismatch");
565 #endif
566 
567   return buildInstr(TargetOpcode::G_ICMP)
568       .addDef(Res)
569       .addPredicate(Pred)
570       .addUse(Op0)
571       .addUse(Op1);
572 }
573 
574 MachineInstrBuilder MachineIRBuilder::buildFCmp(CmpInst::Predicate Pred,
575                                                 unsigned Res, unsigned Op0,
576                                                 unsigned Op1) {
577 #ifndef NDEBUG
578   assert((MRI->getType(Op0).isScalar() || MRI->getType(Op0).isVector()) &&
579          "invalid operand type");
580   assert(MRI->getType(Op0) == MRI->getType(Op1) && "type mismatch");
581   assert(CmpInst::isFPPredicate(Pred) && "invalid predicate");
582   if (MRI->getType(Op0).isScalar())
583     assert(MRI->getType(Res).isScalar() && "type mismatch");
584   else
585     assert(MRI->getType(Res).isVector() &&
586            MRI->getType(Res).getNumElements() ==
587                MRI->getType(Op0).getNumElements() &&
588            "type mismatch");
589 #endif
590 
591   return buildInstr(TargetOpcode::G_FCMP)
592       .addDef(Res)
593       .addPredicate(Pred)
594       .addUse(Op0)
595       .addUse(Op1);
596 }
597 
598 MachineInstrBuilder MachineIRBuilder::buildSelect(unsigned Res, unsigned Tst,
599                                                   unsigned Op0, unsigned Op1) {
600 #ifndef NDEBUG
601   LLT ResTy = MRI->getType(Res);
602   assert((ResTy.isScalar() || ResTy.isVector() || ResTy.isPointer()) &&
603          "invalid operand type");
604   assert(ResTy == MRI->getType(Op0) && ResTy == MRI->getType(Op1) &&
605          "type mismatch");
606   if (ResTy.isScalar() || ResTy.isPointer())
607     assert(MRI->getType(Tst).isScalar() && "type mismatch");
608   else
609     assert((MRI->getType(Tst).isScalar() ||
610             (MRI->getType(Tst).isVector() &&
611              MRI->getType(Tst).getNumElements() ==
612                  MRI->getType(Op0).getNumElements())) &&
613            "type mismatch");
614 #endif
615 
616   return buildInstr(TargetOpcode::G_SELECT)
617       .addDef(Res)
618       .addUse(Tst)
619       .addUse(Op0)
620       .addUse(Op1);
621 }
622 
623 MachineInstrBuilder MachineIRBuilder::buildInsertVectorElement(unsigned Res,
624                                                                unsigned Val,
625                                                                unsigned Elt,
626                                                                unsigned Idx) {
627 #ifndef NDEBUG
628   LLT ResTy = MRI->getType(Res);
629   LLT ValTy = MRI->getType(Val);
630   LLT EltTy = MRI->getType(Elt);
631   LLT IdxTy = MRI->getType(Idx);
632   assert(ResTy.isVector() && ValTy.isVector() && "invalid operand type");
633   assert(IdxTy.isScalar() && "invalid operand type");
634   assert(ResTy.getNumElements() == ValTy.getNumElements() && "type mismatch");
635   assert(ResTy.getElementType() == EltTy && "type mismatch");
636 #endif
637 
638   return buildInstr(TargetOpcode::G_INSERT_VECTOR_ELT)
639       .addDef(Res)
640       .addUse(Val)
641       .addUse(Elt)
642       .addUse(Idx);
643 }
644 
645 MachineInstrBuilder MachineIRBuilder::buildExtractVectorElement(unsigned Res,
646                                                                 unsigned Val,
647                                                                 unsigned Idx) {
648 #ifndef NDEBUG
649   LLT ResTy = MRI->getType(Res);
650   LLT ValTy = MRI->getType(Val);
651   LLT IdxTy = MRI->getType(Idx);
652   assert(ValTy.isVector() && "invalid operand type");
653   assert((ResTy.isScalar() || ResTy.isPointer()) && "invalid operand type");
654   assert(IdxTy.isScalar() && "invalid operand type");
655   assert(ValTy.getElementType() == ResTy && "type mismatch");
656 #endif
657 
658   return buildInstr(TargetOpcode::G_EXTRACT_VECTOR_ELT)
659       .addDef(Res)
660       .addUse(Val)
661       .addUse(Idx);
662 }
663 
664 void MachineIRBuilder::validateTruncExt(unsigned Dst, unsigned Src,
665                                         bool IsExtend) {
666 #ifndef NDEBUG
667   LLT SrcTy = MRI->getType(Src);
668   LLT DstTy = MRI->getType(Dst);
669 
670   if (DstTy.isVector()) {
671     assert(SrcTy.isVector() && "mismatched cast between vecot and non-vector");
672     assert(SrcTy.getNumElements() == DstTy.getNumElements() &&
673            "different number of elements in a trunc/ext");
674   } else
675     assert(DstTy.isScalar() && SrcTy.isScalar() && "invalid extend/trunc");
676 
677   if (IsExtend)
678     assert(DstTy.getSizeInBits() > SrcTy.getSizeInBits() &&
679            "invalid narrowing extend");
680   else
681     assert(DstTy.getSizeInBits() < SrcTy.getSizeInBits() &&
682            "invalid widening trunc");
683 #endif
684 }
685