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 MachineIRBuilder::buildIndirectDbgValue(
100     unsigned Reg, unsigned Offset, const MDNode *Variable, const MDNode *Expr) {
101   assert(isa<DILocalVariable>(Variable) && "not a variable");
102   assert(cast<DIExpression>(Expr)->isValid() && "not an expression");
103   assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&
104          "Expected inlined-at fields to agree");
105   return buildInstr(TargetOpcode::DBG_VALUE)
106       .addReg(Reg, RegState::Debug)
107       .addImm(Offset)
108       .addMetadata(Variable)
109       .addMetadata(Expr);
110 }
111 
112 MachineInstrBuilder MachineIRBuilder::buildFIDbgValue(int FI,
113                                                       const MDNode *Variable,
114                                                       const MDNode *Expr) {
115   assert(isa<DILocalVariable>(Variable) && "not a variable");
116   assert(cast<DIExpression>(Expr)->isValid() && "not an expression");
117   assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&
118          "Expected inlined-at fields to agree");
119   return buildInstr(TargetOpcode::DBG_VALUE)
120       .addFrameIndex(FI)
121       .addImm(0)
122       .addMetadata(Variable)
123       .addMetadata(Expr);
124 }
125 
126 MachineInstrBuilder MachineIRBuilder::buildConstDbgValue(const Constant &C,
127                                                          unsigned Offset,
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(Offset).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::buildAdd(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(TargetOpcode::G_ADD)
177       .addDef(Res)
178       .addUse(Op0)
179       .addUse(Op1);
180 }
181 
182 MachineInstrBuilder MachineIRBuilder::buildGEP(unsigned Res, unsigned Op0,
183                                                unsigned Op1) {
184   assert(MRI->getType(Res).isPointer() &&
185          MRI->getType(Res) == MRI->getType(Op0) && "type mismatch");
186   assert(MRI->getType(Op1).isScalar()  && "invalid offset type");
187 
188   return buildInstr(TargetOpcode::G_GEP)
189       .addDef(Res)
190       .addUse(Op0)
191       .addUse(Op1);
192 }
193 
194 MachineInstrBuilder MachineIRBuilder::buildPtrMask(unsigned Res, unsigned Op0,
195                                                    uint32_t NumBits) {
196   assert(MRI->getType(Res).isPointer() &&
197          MRI->getType(Res) == MRI->getType(Op0) && "type mismatch");
198 
199   return buildInstr(TargetOpcode::G_PTR_MASK)
200       .addDef(Res)
201       .addUse(Op0)
202       .addImm(NumBits);
203 }
204 
205 MachineInstrBuilder MachineIRBuilder::buildSub(unsigned Res, unsigned Op0,
206                                                unsigned Op1) {
207   assert((MRI->getType(Res).isScalar() || MRI->getType(Res).isVector()) &&
208          "invalid operand type");
209   assert(MRI->getType(Res) == MRI->getType(Op0) &&
210          MRI->getType(Res) == MRI->getType(Op1) && "type mismatch");
211 
212   return buildInstr(TargetOpcode::G_SUB)
213       .addDef(Res)
214       .addUse(Op0)
215       .addUse(Op1);
216 }
217 
218 MachineInstrBuilder MachineIRBuilder::buildMul(unsigned Res, unsigned Op0,
219                                                unsigned Op1) {
220   assert((MRI->getType(Res).isScalar() || MRI->getType(Res).isVector()) &&
221          "invalid operand type");
222   assert(MRI->getType(Res) == MRI->getType(Op0) &&
223          MRI->getType(Res) == MRI->getType(Op1) && "type mismatch");
224 
225   return buildInstr(TargetOpcode::G_MUL)
226       .addDef(Res)
227       .addUse(Op0)
228       .addUse(Op1);
229 }
230 
231 MachineInstrBuilder MachineIRBuilder::buildAnd(unsigned Res, unsigned Op0,
232                                                unsigned Op1) {
233   assert((MRI->getType(Res).isScalar() || MRI->getType(Res).isVector()) &&
234          "invalid operand type");
235   assert(MRI->getType(Res) == MRI->getType(Op0) &&
236          MRI->getType(Res) == MRI->getType(Op1) && "type mismatch");
237 
238   return buildInstr(TargetOpcode::G_AND)
239       .addDef(Res)
240       .addUse(Op0)
241       .addUse(Op1);
242 }
243 
244 MachineInstrBuilder MachineIRBuilder::buildBr(MachineBasicBlock &Dest) {
245   return buildInstr(TargetOpcode::G_BR).addMBB(&Dest);
246 }
247 
248 MachineInstrBuilder MachineIRBuilder::buildBrIndirect(unsigned Tgt) {
249   return buildInstr(TargetOpcode::G_BRINDIRECT).addUse(Tgt);
250 }
251 
252 MachineInstrBuilder MachineIRBuilder::buildCopy(unsigned Res, unsigned Op) {
253   return buildInstr(TargetOpcode::COPY).addDef(Res).addUse(Op);
254 }
255 
256 MachineInstrBuilder MachineIRBuilder::buildConstant(unsigned Res,
257                                                     const ConstantInt &Val) {
258   LLT Ty = MRI->getType(Res);
259 
260   assert((Ty.isScalar() || Ty.isPointer()) && "invalid operand type");
261 
262   const ConstantInt *NewVal = &Val;
263   if (Ty.getSizeInBits() != Val.getBitWidth())
264     NewVal = ConstantInt::get(MF->getFunction()->getContext(),
265                               Val.getValue().sextOrTrunc(Ty.getSizeInBits()));
266 
267   return buildInstr(TargetOpcode::G_CONSTANT).addDef(Res).addCImm(NewVal);
268 }
269 
270 MachineInstrBuilder MachineIRBuilder::buildConstant(unsigned Res,
271                                                     int64_t Val) {
272   auto IntN = IntegerType::get(MF->getFunction()->getContext(),
273                                MRI->getType(Res).getSizeInBits());
274   ConstantInt *CI = ConstantInt::get(IntN, Val, true);
275   return buildConstant(Res, *CI);
276 }
277 
278 MachineInstrBuilder MachineIRBuilder::buildFConstant(unsigned Res,
279                                                      const ConstantFP &Val) {
280   assert(MRI->getType(Res).isScalar() && "invalid operand type");
281 
282   return buildInstr(TargetOpcode::G_FCONSTANT).addDef(Res).addFPImm(&Val);
283 }
284 
285 MachineInstrBuilder MachineIRBuilder::buildBrCond(unsigned Tst,
286                                                   MachineBasicBlock &Dest) {
287   assert(MRI->getType(Tst).isScalar() && "invalid operand type");
288 
289   return buildInstr(TargetOpcode::G_BRCOND).addUse(Tst).addMBB(&Dest);
290 }
291 
292 MachineInstrBuilder MachineIRBuilder::buildLoad(unsigned Res, unsigned Addr,
293                                                 MachineMemOperand &MMO) {
294   assert(MRI->getType(Res).isValid() && "invalid operand type");
295   assert(MRI->getType(Addr).isPointer() && "invalid operand type");
296 
297   return buildInstr(TargetOpcode::G_LOAD)
298       .addDef(Res)
299       .addUse(Addr)
300       .addMemOperand(&MMO);
301 }
302 
303 MachineInstrBuilder MachineIRBuilder::buildStore(unsigned Val, unsigned Addr,
304                                                  MachineMemOperand &MMO) {
305   assert(MRI->getType(Val).isValid() && "invalid operand type");
306   assert(MRI->getType(Addr).isPointer() && "invalid operand type");
307 
308   return buildInstr(TargetOpcode::G_STORE)
309       .addUse(Val)
310       .addUse(Addr)
311       .addMemOperand(&MMO);
312 }
313 
314 MachineInstrBuilder MachineIRBuilder::buildUAdde(unsigned Res,
315                                                  unsigned CarryOut,
316                                                  unsigned Op0, unsigned Op1,
317                                                  unsigned CarryIn) {
318   assert(MRI->getType(Res).isScalar() && "invalid operand type");
319   assert(MRI->getType(Res) == MRI->getType(Op0) &&
320          MRI->getType(Res) == MRI->getType(Op1) && "type mismatch");
321   assert(MRI->getType(CarryOut).isScalar() && "invalid operand type");
322   assert(MRI->getType(CarryOut) == MRI->getType(CarryIn) && "type mismatch");
323 
324   return buildInstr(TargetOpcode::G_UADDE)
325       .addDef(Res)
326       .addDef(CarryOut)
327       .addUse(Op0)
328       .addUse(Op1)
329       .addUse(CarryIn);
330 }
331 
332 MachineInstrBuilder MachineIRBuilder::buildAnyExt(unsigned Res, unsigned Op) {
333   validateTruncExt(Res, Op, true);
334   return buildInstr(TargetOpcode::G_ANYEXT).addDef(Res).addUse(Op);
335 }
336 
337 MachineInstrBuilder MachineIRBuilder::buildSExt(unsigned Res, unsigned Op) {
338   validateTruncExt(Res, Op, true);
339   return buildInstr(TargetOpcode::G_SEXT).addDef(Res).addUse(Op);
340 }
341 
342 MachineInstrBuilder MachineIRBuilder::buildZExt(unsigned Res, unsigned Op) {
343   validateTruncExt(Res, Op, true);
344   return buildInstr(TargetOpcode::G_ZEXT).addDef(Res).addUse(Op);
345 }
346 
347 MachineInstrBuilder MachineIRBuilder::buildSExtOrTrunc(unsigned Res,
348                                                        unsigned Op) {
349   unsigned Opcode = TargetOpcode::COPY;
350   if (MRI->getType(Res).getSizeInBits() > MRI->getType(Op).getSizeInBits())
351     Opcode = TargetOpcode::G_SEXT;
352   else if (MRI->getType(Res).getSizeInBits() < MRI->getType(Op).getSizeInBits())
353     Opcode = TargetOpcode::G_TRUNC;
354 
355   return buildInstr(Opcode).addDef(Res).addUse(Op);
356 }
357 
358 MachineInstrBuilder MachineIRBuilder::buildZExtOrTrunc(unsigned Res,
359                                                        unsigned Op) {
360   unsigned Opcode = TargetOpcode::COPY;
361   if (MRI->getType(Res).getSizeInBits() > MRI->getType(Op).getSizeInBits())
362     Opcode = TargetOpcode::G_ZEXT;
363   else if (MRI->getType(Res).getSizeInBits() < MRI->getType(Op).getSizeInBits())
364     Opcode = TargetOpcode::G_TRUNC;
365 
366   return buildInstr(Opcode).addDef(Res).addUse(Op);
367 }
368 
369 
370 MachineInstrBuilder MachineIRBuilder::buildCast(unsigned Dst, unsigned Src) {
371   LLT SrcTy = MRI->getType(Src);
372   LLT DstTy = MRI->getType(Dst);
373   if (SrcTy == DstTy)
374     return buildCopy(Dst, Src);
375 
376   unsigned Opcode;
377   if (SrcTy.isPointer() && DstTy.isScalar())
378     Opcode = TargetOpcode::G_PTRTOINT;
379   else if (DstTy.isPointer() && SrcTy.isScalar())
380     Opcode = TargetOpcode::G_INTTOPTR;
381   else {
382     assert(!SrcTy.isPointer() && !DstTy.isPointer() && "n G_ADDRCAST yet");
383     Opcode = TargetOpcode::G_BITCAST;
384   }
385 
386   return buildInstr(Opcode).addDef(Dst).addUse(Src);
387 }
388 
389 MachineInstrBuilder MachineIRBuilder::buildExtract(unsigned Res, unsigned Src,
390                                                    uint64_t Index) {
391 #ifndef NDEBUG
392   assert(MRI->getType(Src).isValid() && "invalid operand type");
393   assert(MRI->getType(Res).isValid() && "invalid operand type");
394   assert(Index + MRI->getType(Res).getSizeInBits() <=
395              MRI->getType(Src).getSizeInBits() &&
396          "extracting off end of register");
397 #endif
398 
399   if (MRI->getType(Res).getSizeInBits() == MRI->getType(Src).getSizeInBits()) {
400     assert(Index == 0 && "insertion past the end of a register");
401     return buildCast(Res, Src);
402   }
403 
404   return buildInstr(TargetOpcode::G_EXTRACT)
405       .addDef(Res)
406       .addUse(Src)
407       .addImm(Index);
408 }
409 
410 MachineInstrBuilder
411 MachineIRBuilder::buildSequence(unsigned Res,
412                                 ArrayRef<unsigned> Ops,
413                                 ArrayRef<uint64_t> Indices) {
414 #ifndef NDEBUG
415   assert(Ops.size() == Indices.size() && "incompatible args");
416   assert(!Ops.empty() && "invalid trivial sequence");
417   assert(std::is_sorted(Indices.begin(), Indices.end()) &&
418          "sequence offsets must be in ascending order");
419 
420   assert(MRI->getType(Res).isValid() && "invalid operand type");
421   for (auto Op : Ops)
422     assert(MRI->getType(Op).isValid() && "invalid operand type");
423 #endif
424 
425   MachineInstrBuilder MIB = buildInstr(TargetOpcode::G_SEQUENCE);
426   MIB.addDef(Res);
427   for (unsigned i = 0; i < Ops.size(); ++i) {
428     MIB.addUse(Ops[i]);
429     MIB.addImm(Indices[i]);
430   }
431   return MIB;
432 }
433 
434 MachineInstrBuilder MachineIRBuilder::buildUndef(unsigned Res) {
435   return buildInstr(TargetOpcode::IMPLICIT_DEF).addDef(Res);
436 }
437 
438 MachineInstrBuilder MachineIRBuilder::buildMerge(unsigned Res,
439                                                  ArrayRef<unsigned> Ops) {
440 
441 #ifndef NDEBUG
442   assert(!Ops.empty() && "invalid trivial sequence");
443   LLT Ty = MRI->getType(Ops[0]);
444   for (auto Reg : Ops)
445     assert(MRI->getType(Reg) == Ty && "type mismatch in input list");
446   assert(Ops.size() * MRI->getType(Ops[0]).getSizeInBits() ==
447              MRI->getType(Res).getSizeInBits() &&
448          "input operands do not cover output register");
449 #endif
450 
451   MachineInstrBuilder MIB = buildInstr(TargetOpcode::G_MERGE_VALUES);
452   MIB.addDef(Res);
453   for (unsigned i = 0; i < Ops.size(); ++i)
454     MIB.addUse(Ops[i]);
455   return MIB;
456 }
457 
458 MachineInstrBuilder MachineIRBuilder::buildUnmerge(ArrayRef<unsigned> Res,
459                                                    unsigned Op) {
460 
461 #ifndef NDEBUG
462   assert(!Res.empty() && "invalid trivial sequence");
463   LLT Ty = MRI->getType(Res[0]);
464   for (auto Reg : Res)
465     assert(MRI->getType(Reg) == Ty && "type mismatch in input list");
466   assert(Res.size() * MRI->getType(Res[0]).getSizeInBits() ==
467              MRI->getType(Op).getSizeInBits() &&
468          "input operands do not cover output register");
469 #endif
470 
471   MachineInstrBuilder MIB = buildInstr(TargetOpcode::G_UNMERGE_VALUES);
472   for (unsigned i = 0; i < Res.size(); ++i)
473     MIB.addDef(Res[i]);
474   MIB.addUse(Op);
475   return MIB;
476 }
477 
478 MachineInstrBuilder MachineIRBuilder::buildInsert(unsigned Res, unsigned Src,
479                                                   unsigned Op, unsigned Index) {
480   if (MRI->getType(Res).getSizeInBits() == MRI->getType(Op).getSizeInBits()) {
481     assert(Index == 0 && "insertion past the end of a register");
482     return buildCast(Res, Op);
483   }
484 
485   return buildInstr(TargetOpcode::G_INSERT)
486       .addDef(Res)
487       .addUse(Src)
488       .addUse(Op)
489       .addImm(Index);
490 }
491 
492 MachineInstrBuilder MachineIRBuilder::buildIntrinsic(Intrinsic::ID ID,
493                                                      unsigned Res,
494                                                      bool HasSideEffects) {
495   auto MIB =
496       buildInstr(HasSideEffects ? TargetOpcode::G_INTRINSIC_W_SIDE_EFFECTS
497                                 : TargetOpcode::G_INTRINSIC);
498   if (Res)
499     MIB.addDef(Res);
500   MIB.addIntrinsicID(ID);
501   return MIB;
502 }
503 
504 MachineInstrBuilder MachineIRBuilder::buildTrunc(unsigned Res, unsigned Op) {
505   validateTruncExt(Res, Op, false);
506   return buildInstr(TargetOpcode::G_TRUNC).addDef(Res).addUse(Op);
507 }
508 
509 MachineInstrBuilder MachineIRBuilder::buildFPTrunc(unsigned Res, unsigned Op) {
510   validateTruncExt(Res, Op, false);
511   return buildInstr(TargetOpcode::G_FPTRUNC).addDef(Res).addUse(Op);
512 }
513 
514 MachineInstrBuilder MachineIRBuilder::buildICmp(CmpInst::Predicate Pred,
515                                                 unsigned Res, unsigned Op0,
516                                                 unsigned Op1) {
517 #ifndef NDEBUG
518   assert(MRI->getType(Op0) == MRI->getType(Op0) && "type mismatch");
519   assert(CmpInst::isIntPredicate(Pred) && "invalid predicate");
520   if (MRI->getType(Op0).isScalar() || MRI->getType(Op0).isPointer())
521     assert(MRI->getType(Res).isScalar() && "type mismatch");
522   else
523     assert(MRI->getType(Res).isVector() &&
524            MRI->getType(Res).getNumElements() ==
525                MRI->getType(Op0).getNumElements() &&
526            "type mismatch");
527 #endif
528 
529   return buildInstr(TargetOpcode::G_ICMP)
530       .addDef(Res)
531       .addPredicate(Pred)
532       .addUse(Op0)
533       .addUse(Op1);
534 }
535 
536 MachineInstrBuilder MachineIRBuilder::buildFCmp(CmpInst::Predicate Pred,
537                                                 unsigned Res, unsigned Op0,
538                                                 unsigned Op1) {
539 #ifndef NDEBUG
540   assert((MRI->getType(Op0).isScalar() || MRI->getType(Op0).isVector()) &&
541          "invalid operand type");
542   assert(MRI->getType(Op0) == MRI->getType(Op1) && "type mismatch");
543   assert(CmpInst::isFPPredicate(Pred) && "invalid predicate");
544   if (MRI->getType(Op0).isScalar())
545     assert(MRI->getType(Res).isScalar() && "type mismatch");
546   else
547     assert(MRI->getType(Res).isVector() &&
548            MRI->getType(Res).getNumElements() ==
549                MRI->getType(Op0).getNumElements() &&
550            "type mismatch");
551 #endif
552 
553   return buildInstr(TargetOpcode::G_FCMP)
554       .addDef(Res)
555       .addPredicate(Pred)
556       .addUse(Op0)
557       .addUse(Op1);
558 }
559 
560 MachineInstrBuilder MachineIRBuilder::buildSelect(unsigned Res, unsigned Tst,
561                                                   unsigned Op0, unsigned Op1) {
562 #ifndef NDEBUG
563   LLT ResTy = MRI->getType(Res);
564   assert((ResTy.isScalar() || ResTy.isVector() || ResTy.isPointer()) &&
565          "invalid operand type");
566   assert(ResTy == MRI->getType(Op0) && ResTy == MRI->getType(Op1) &&
567          "type mismatch");
568   if (ResTy.isScalar() || ResTy.isPointer())
569     assert(MRI->getType(Tst).isScalar() && "type mismatch");
570   else
571     assert((MRI->getType(Tst).isScalar() ||
572             (MRI->getType(Tst).isVector() &&
573              MRI->getType(Tst).getNumElements() ==
574                  MRI->getType(Op0).getNumElements())) &&
575            "type mismatch");
576 #endif
577 
578   return buildInstr(TargetOpcode::G_SELECT)
579       .addDef(Res)
580       .addUse(Tst)
581       .addUse(Op0)
582       .addUse(Op1);
583 }
584 
585 MachineInstrBuilder MachineIRBuilder::buildInsertVectorElement(unsigned Res,
586                                                                unsigned Val,
587                                                                unsigned Elt,
588                                                                unsigned Idx) {
589 #ifndef NDEBUG
590   LLT ResTy = MRI->getType(Res);
591   LLT ValTy = MRI->getType(Val);
592   LLT EltTy = MRI->getType(Elt);
593   LLT IdxTy = MRI->getType(Idx);
594   assert(ResTy.isVector() && ValTy.isVector() && "invalid operand type");
595   assert(IdxTy.isScalar() && "invalid operand type");
596   assert(ResTy.getNumElements() == ValTy.getNumElements() && "type mismatch");
597   assert(ResTy.getElementType() == EltTy && "type mismatch");
598 #endif
599 
600   return buildInstr(TargetOpcode::G_INSERT_VECTOR_ELT)
601       .addDef(Res)
602       .addUse(Val)
603       .addUse(Elt)
604       .addUse(Idx);
605 }
606 
607 MachineInstrBuilder MachineIRBuilder::buildExtractVectorElement(unsigned Res,
608                                                                 unsigned Val,
609                                                                 unsigned Idx) {
610 #ifndef NDEBUG
611   LLT ResTy = MRI->getType(Res);
612   LLT ValTy = MRI->getType(Val);
613   LLT IdxTy = MRI->getType(Idx);
614   assert(ValTy.isVector() && "invalid operand type");
615   assert((ResTy.isScalar() || ResTy.isPointer()) && "invalid operand type");
616   assert(IdxTy.isScalar() && "invalid operand type");
617   assert(ValTy.getElementType() == ResTy && "type mismatch");
618 #endif
619 
620   return buildInstr(TargetOpcode::G_EXTRACT_VECTOR_ELT)
621       .addDef(Res)
622       .addUse(Val)
623       .addUse(Idx);
624 }
625 
626 void MachineIRBuilder::validateTruncExt(unsigned Dst, unsigned Src,
627                                         bool IsExtend) {
628 #ifndef NDEBUG
629   LLT SrcTy = MRI->getType(Src);
630   LLT DstTy = MRI->getType(Dst);
631 
632   if (DstTy.isVector()) {
633     assert(SrcTy.isVector() && "mismatched cast between vecot and non-vector");
634     assert(SrcTy.getNumElements() == DstTy.getNumElements() &&
635            "different number of elements in a trunc/ext");
636   } else
637     assert(DstTy.isScalar() && SrcTy.isScalar() && "invalid extend/trunc");
638 
639   if (IsExtend)
640     assert(DstTy.getSizeInBits() > SrcTy.getSizeInBits() &&
641            "invalid narrowing extend");
642   else
643     assert(DstTy.getSizeInBits() < SrcTy.getSizeInBits() &&
644            "invalid widening trunc");
645 #endif
646 }
647