unittests/IR/InstructionsTest.cpp

   1 //===- llvm/unittest/IR/InstructionsTest.cpp - Instructions unit tests ----===//
   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 #include "llvm/AsmParser/Parser.h"
  10 #include "llvm/IR/Instructions.h"
  11 #include "llvm/ADT/STLExtras.h"
  12 #include "llvm/Analysis/ValueTracking.h"
  13 #include "llvm/IR/BasicBlock.h"
  14 #include "llvm/IR/Constants.h"
  15 #include "llvm/IR/DataLayout.h"
  16 #include "llvm/IR/DerivedTypes.h"
  17 #include "llvm/IR/Function.h"
  18 #include "llvm/IR/IRBuilder.h"
  19 #include "llvm/IR/LLVMContext.h"
  20 #include "llvm/IR/MDBuilder.h"
  21 #include "llvm/IR/Module.h"
  22 #include "llvm/IR/NoFolder.h"
  23 #include "llvm/IR/Operator.h"
  24 #include "llvm/Support/SourceMgr.h"
  25 #include "gmock/gmock-matchers.h"
  26 #include "gtest/gtest.h"
  27 #include <memory>
  28
  29 namespace llvm {
  30 namespace {
  31
  32 static std::unique_ptr<Module> parseIR(LLVMContext &C, const char *IR) {
  33   SMDiagnostic Err;
  34   std::unique_ptr<Module> Mod = parseAssemblyString(IR, Err, C);
  35   if (!Mod)
  36     Err.print("InstructionsTests", errs());
  37   return Mod;
  38 }
  39
  40 TEST(InstructionsTest, ReturnInst) {
  41   LLVMContext C;
  42
  43   // test for PR6589
  44   const ReturnInst* r0 = ReturnInst::Create(C);
  45   EXPECT_EQ(r0->getNumOperands(), 0U);
  46   EXPECT_EQ(r0->op_begin(), r0->op_end());
  47
  48   IntegerType* Int1 = IntegerType::get(C, 1);
  49   Constant* One = ConstantInt::get(Int1, 1, true);
  50   const ReturnInst* r1 = ReturnInst::Create(C, One);
  51   EXPECT_EQ(1U, r1->getNumOperands());
  52   User::const_op_iterator b(r1->op_begin());
  53   EXPECT_NE(r1->op_end(), b);
  54   EXPECT_EQ(One, *b);
  55   EXPECT_EQ(One, r1->getOperand(0));
  56   ++b;
  57   EXPECT_EQ(r1->op_end(), b);
  58
  59   // clean up
  60   delete r0;
  61   delete r1;
  62 }
  63
  64 // Test fixture that provides a module and a single function within it. Useful
  65 // for tests that need to refer to the function in some way.
  66 class ModuleWithFunctionTest : public testing::Test {
  67 protected:
  68   ModuleWithFunctionTest() : M(new Module("MyModule", Ctx)) {
  69     FArgTypes.push_back(Type::getInt8Ty(Ctx));
  70     FArgTypes.push_back(Type::getInt32Ty(Ctx));
  71     FArgTypes.push_back(Type::getInt64Ty(Ctx));
  72     FunctionType *FTy =
  73         FunctionType::get(Type::getVoidTy(Ctx), FArgTypes, false);
  74     F = Function::Create(FTy, Function::ExternalLinkage, "", M.get());
  75   }
  76
  77   LLVMContext Ctx;
  78   std::unique_ptr<Module> M;
  79   SmallVector<Type *, 3> FArgTypes;
  80   Function *F;
  81 };
  82
  83 TEST_F(ModuleWithFunctionTest, CallInst) {
  84   Value *Args[] = {ConstantInt::get(Type::getInt8Ty(Ctx), 20),
  85                    ConstantInt::get(Type::getInt32Ty(Ctx), 9999),
  86                    ConstantInt::get(Type::getInt64Ty(Ctx), 42)};
  87   std::unique_ptr<CallInst> Call(CallInst::Create(F, Args));
  88
  89   // Make sure iteration over a call's arguments works as expected.
  90   unsigned Idx = 0;
  91   for (Value *Arg : Call->arg_operands()) {
  92     EXPECT_EQ(FArgTypes[Idx], Arg->getType());
  93     EXPECT_EQ(Call->getArgOperand(Idx)->getType(), Arg->getType());
  94     Idx++;
  95   }
  96 }
  97
  98 TEST_F(ModuleWithFunctionTest, InvokeInst) {
  99   BasicBlock *BB1 = BasicBlock::Create(Ctx, "", F);
 100   BasicBlock *BB2 = BasicBlock::Create(Ctx, "", F);
 101
 102   Value *Args[] = {ConstantInt::get(Type::getInt8Ty(Ctx), 20),
 103                    ConstantInt::get(Type::getInt32Ty(Ctx), 9999),
 104                    ConstantInt::get(Type::getInt64Ty(Ctx), 42)};
 105   std::unique_ptr<InvokeInst> Invoke(InvokeInst::Create(F, BB1, BB2, Args));
 106
 107   // Make sure iteration over invoke's arguments works as expected.
 108   unsigned Idx = 0;
 109   for (Value *Arg : Invoke->arg_operands()) {
 110     EXPECT_EQ(FArgTypes[Idx], Arg->getType());
 111     EXPECT_EQ(Invoke->getArgOperand(Idx)->getType(), Arg->getType());
 112     Idx++;
 113   }
 114 }
 115
 116 TEST(InstructionsTest, BranchInst) {
 117   LLVMContext C;
 118
 119   // Make a BasicBlocks
 120   BasicBlock* bb0 = BasicBlock::Create(C);
 121   BasicBlock* bb1 = BasicBlock::Create(C);
 122
 123   // Mandatory BranchInst
 124   const BranchInst* b0 = BranchInst::Create(bb0);
 125
 126   EXPECT_TRUE(b0->isUnconditional());
 127   EXPECT_FALSE(b0->isConditional());
 128   EXPECT_EQ(1U, b0->getNumSuccessors());
 129
 130   // check num operands
 131   EXPECT_EQ(1U, b0->getNumOperands());
 132
 133   EXPECT_NE(b0->op_begin(), b0->op_end());
 134   EXPECT_EQ(b0->op_end(), std::next(b0->op_begin()));
 135
 136   EXPECT_EQ(b0->op_end(), std::next(b0->op_begin()));
 137
 138   IntegerType* Int1 = IntegerType::get(C, 1);
 139   Constant* One = ConstantInt::get(Int1, 1, true);
 140
 141   // Conditional BranchInst
 142   BranchInst* b1 = BranchInst::Create(bb0, bb1, One);
 143
 144   EXPECT_FALSE(b1->isUnconditional());
 145   EXPECT_TRUE(b1->isConditional());
 146   EXPECT_EQ(2U, b1->getNumSuccessors());
 147
 148   // check num operands
 149   EXPECT_EQ(3U, b1->getNumOperands());
 150
 151   User::const_op_iterator b(b1->op_begin());
 152
 153   // check COND
 154   EXPECT_NE(b, b1->op_end());
 155   EXPECT_EQ(One, *b);
 156   EXPECT_EQ(One, b1->getOperand(0));
 157   EXPECT_EQ(One, b1->getCondition());
 158   ++b;
 159
 160   // check ELSE
 161   EXPECT_EQ(bb1, *b);
 162   EXPECT_EQ(bb1, b1->getOperand(1));
 163   EXPECT_EQ(bb1, b1->getSuccessor(1));
 164   ++b;
 165
 166   // check THEN
 167   EXPECT_EQ(bb0, *b);
 168   EXPECT_EQ(bb0, b1->getOperand(2));
 169   EXPECT_EQ(bb0, b1->getSuccessor(0));
 170   ++b;
 171
 172   EXPECT_EQ(b1->op_end(), b);
 173
 174   // clean up
 175   delete b0;
 176   delete b1;
 177
 178   delete bb0;
 179   delete bb1;
 180 }
 181
 182 TEST(InstructionsTest, CastInst) {
 183   LLVMContext C;
 184
 185   Type *Int8Ty = Type::getInt8Ty(C);
 186   Type *Int16Ty = Type::getInt16Ty(C);
 187   Type *Int32Ty = Type::getInt32Ty(C);
 188   Type *Int64Ty = Type::getInt64Ty(C);
 189   Type *V8x8Ty = VectorType::get(Int8Ty, 8);
 190   Type *V8x64Ty = VectorType::get(Int64Ty, 8);
 191   Type *X86MMXTy = Type::getX86_MMXTy(C);
 192
 193   Type *HalfTy = Type::getHalfTy(C);
 194   Type *FloatTy = Type::getFloatTy(C);
 195   Type *DoubleTy = Type::getDoubleTy(C);
 196
 197   Type *V2Int32Ty = VectorType::get(Int32Ty, 2);
 198   Type *V2Int64Ty = VectorType::get(Int64Ty, 2);
 199   Type *V4Int16Ty = VectorType::get(Int16Ty, 4);
 200
 201   Type *Int32PtrTy = PointerType::get(Int32Ty, 0);
 202   Type *Int64PtrTy = PointerType::get(Int64Ty, 0);
 203
 204   Type *Int32PtrAS1Ty = PointerType::get(Int32Ty, 1);
 205   Type *Int64PtrAS1Ty = PointerType::get(Int64Ty, 1);
 206
 207   Type *V2Int32PtrAS1Ty = VectorType::get(Int32PtrAS1Ty, 2);
 208   Type *V2Int64PtrAS1Ty = VectorType::get(Int64PtrAS1Ty, 2);
 209   Type *V4Int32PtrAS1Ty = VectorType::get(Int32PtrAS1Ty, 4);
 210   Type *V4Int64PtrAS1Ty = VectorType::get(Int64PtrAS1Ty, 4);
 211
 212   Type *V2Int64PtrTy = VectorType::get(Int64PtrTy, 2);
 213   Type *V2Int32PtrTy = VectorType::get(Int32PtrTy, 2);
 214   Type *V4Int32PtrTy = VectorType::get(Int32PtrTy, 4);
 215
 216   const Constant* c8 = Constant::getNullValue(V8x8Ty);
 217   const Constant* c64 = Constant::getNullValue(V8x64Ty);
 218
 219   const Constant *v2ptr32 = Constant::getNullValue(V2Int32PtrTy);
 220
 221   EXPECT_TRUE(CastInst::isCastable(V8x8Ty, X86MMXTy));
 222   EXPECT_TRUE(CastInst::isCastable(X86MMXTy, V8x8Ty));
 223   EXPECT_FALSE(CastInst::isCastable(Int64Ty, X86MMXTy));
 224   EXPECT_TRUE(CastInst::isCastable(V8x64Ty, V8x8Ty));
 225   EXPECT_TRUE(CastInst::isCastable(V8x8Ty, V8x64Ty));
 226   EXPECT_EQ(CastInst::Trunc, CastInst::getCastOpcode(c64, true, V8x8Ty, true));
 227   EXPECT_EQ(CastInst::SExt, CastInst::getCastOpcode(c8, true, V8x64Ty, true));
 228
 229   EXPECT_FALSE(CastInst::isBitCastable(V8x8Ty, X86MMXTy));
 230   EXPECT_FALSE(CastInst::isBitCastable(X86MMXTy, V8x8Ty));
 231   EXPECT_FALSE(CastInst::isBitCastable(Int64Ty, X86MMXTy));
 232   EXPECT_FALSE(CastInst::isBitCastable(V8x64Ty, V8x8Ty));
 233   EXPECT_FALSE(CastInst::isBitCastable(V8x8Ty, V8x64Ty));
 234
 235   // Check address space casts are rejected since we don't know the sizes here
 236   EXPECT_FALSE(CastInst::isBitCastable(Int32PtrTy, Int32PtrAS1Ty));
 237   EXPECT_FALSE(CastInst::isBitCastable(Int32PtrAS1Ty, Int32PtrTy));
 238   EXPECT_FALSE(CastInst::isBitCastable(V2Int32PtrTy, V2Int32PtrAS1Ty));
 239   EXPECT_FALSE(CastInst::isBitCastable(V2Int32PtrAS1Ty, V2Int32PtrTy));
 240   EXPECT_TRUE(CastInst::isBitCastable(V2Int32PtrAS1Ty, V2Int64PtrAS1Ty));
 241   EXPECT_TRUE(CastInst::isCastable(V2Int32PtrAS1Ty, V2Int32PtrTy));
 242   EXPECT_EQ(CastInst::AddrSpaceCast, CastInst::getCastOpcode(v2ptr32, true,
 243                                                              V2Int32PtrAS1Ty,
 244                                                              true));
 245
 246   // Test mismatched number of elements for pointers
 247   EXPECT_FALSE(CastInst::isBitCastable(V2Int32PtrAS1Ty, V4Int64PtrAS1Ty));
 248   EXPECT_FALSE(CastInst::isBitCastable(V4Int64PtrAS1Ty, V2Int32PtrAS1Ty));
 249   EXPECT_FALSE(CastInst::isBitCastable(V2Int32PtrAS1Ty, V4Int32PtrAS1Ty));
 250   EXPECT_FALSE(CastInst::isBitCastable(Int32PtrTy, V2Int32PtrTy));
 251   EXPECT_FALSE(CastInst::isBitCastable(V2Int32PtrTy, Int32PtrTy));
 252
 253   EXPECT_TRUE(CastInst::isBitCastable(Int32PtrTy, Int64PtrTy));
 254   EXPECT_FALSE(CastInst::isBitCastable(DoubleTy, FloatTy));
 255   EXPECT_FALSE(CastInst::isBitCastable(FloatTy, DoubleTy));
 256   EXPECT_TRUE(CastInst::isBitCastable(FloatTy, FloatTy));
 257   EXPECT_TRUE(CastInst::isBitCastable(FloatTy, FloatTy));
 258   EXPECT_TRUE(CastInst::isBitCastable(FloatTy, Int32Ty));
 259   EXPECT_TRUE(CastInst::isBitCastable(Int16Ty, HalfTy));
 260   EXPECT_TRUE(CastInst::isBitCastable(Int32Ty, FloatTy));
 261   EXPECT_TRUE(CastInst::isBitCastable(V2Int32Ty, Int64Ty));
 262
 263   EXPECT_TRUE(CastInst::isBitCastable(V2Int32Ty, V4Int16Ty));
 264   EXPECT_FALSE(CastInst::isBitCastable(Int32Ty, Int64Ty));
 265   EXPECT_FALSE(CastInst::isBitCastable(Int64Ty, Int32Ty));
 266
 267   EXPECT_FALSE(CastInst::isBitCastable(V2Int32PtrTy, Int64Ty));
 268   EXPECT_FALSE(CastInst::isBitCastable(Int64Ty, V2Int32PtrTy));
 269   EXPECT_TRUE(CastInst::isBitCastable(V2Int64PtrTy, V2Int32PtrTy));
 270   EXPECT_TRUE(CastInst::isBitCastable(V2Int32PtrTy, V2Int64PtrTy));
 271   EXPECT_FALSE(CastInst::isBitCastable(V2Int32Ty, V2Int64Ty));
 272   EXPECT_FALSE(CastInst::isBitCastable(V2Int64Ty, V2Int32Ty));
 273
 274
 275   EXPECT_FALSE(CastInst::castIsValid(Instruction::BitCast,
 276                                      Constant::getNullValue(V4Int32PtrTy),
 277                                      V2Int32PtrTy));
 278   EXPECT_FALSE(CastInst::castIsValid(Instruction::BitCast,
 279                                      Constant::getNullValue(V2Int32PtrTy),
 280                                      V4Int32PtrTy));
 281
 282   EXPECT_FALSE(CastInst::castIsValid(Instruction::AddrSpaceCast,
 283                                      Constant::getNullValue(V4Int32PtrAS1Ty),
 284                                      V2Int32PtrTy));
 285   EXPECT_FALSE(CastInst::castIsValid(Instruction::AddrSpaceCast,
 286                                      Constant::getNullValue(V2Int32PtrTy),
 287                                      V4Int32PtrAS1Ty));
 288
 289
 290   // Check that assertion is not hit when creating a cast with a vector of
 291   // pointers
 292   // First form
 293   BasicBlock *BB = BasicBlock::Create(C);
 294   Constant *NullV2I32Ptr = Constant::getNullValue(V2Int32PtrTy);
 295   auto Inst1 = CastInst::CreatePointerCast(NullV2I32Ptr, V2Int32Ty, "foo", BB);
 296
 297   // Second form
 298   auto Inst2 = CastInst::CreatePointerCast(NullV2I32Ptr, V2Int32Ty);
 299
 300   delete Inst2;
 301   Inst1->eraseFromParent();
 302   delete BB;
 303 }
 304
 305 TEST(InstructionsTest, VectorGep) {
 306   LLVMContext C;
 307
 308   // Type Definitions
 309   Type *I8Ty = IntegerType::get(C, 8);
 310   Type *I32Ty = IntegerType::get(C, 32);
 311   PointerType *Ptri8Ty = PointerType::get(I8Ty, 0);
 312   PointerType *Ptri32Ty = PointerType::get(I32Ty, 0);
 313
 314   VectorType *V2xi8PTy = VectorType::get(Ptri8Ty, 2);
 315   VectorType *V2xi32PTy = VectorType::get(Ptri32Ty, 2);
 316
 317   // Test different aspects of the vector-of-pointers type
 318   // and GEPs which use this type.
 319   ConstantInt *Ci32a = ConstantInt::get(C, APInt(32, 1492));
 320   ConstantInt *Ci32b = ConstantInt::get(C, APInt(32, 1948));
 321   std::vector<Constant*> ConstVa(2, Ci32a);
 322   std::vector<Constant*> ConstVb(2, Ci32b);
 323   Constant *C2xi32a = ConstantVector::get(ConstVa);
 324   Constant *C2xi32b = ConstantVector::get(ConstVb);
 325
 326   CastInst *PtrVecA = new IntToPtrInst(C2xi32a, V2xi32PTy);
 327   CastInst *PtrVecB = new IntToPtrInst(C2xi32b, V2xi32PTy);
 328
 329   ICmpInst *ICmp0 = new ICmpInst(ICmpInst::ICMP_SGT, PtrVecA, PtrVecB);
 330   ICmpInst *ICmp1 = new ICmpInst(ICmpInst::ICMP_ULT, PtrVecA, PtrVecB);
 331   EXPECT_NE(ICmp0, ICmp1); // suppress warning.
 332
 333   BasicBlock* BB0 = BasicBlock::Create(C);
 334   // Test InsertAtEnd ICmpInst constructor.
 335   ICmpInst *ICmp2 = new ICmpInst(*BB0, ICmpInst::ICMP_SGE, PtrVecA, PtrVecB);
 336   EXPECT_NE(ICmp0, ICmp2); // suppress warning.
 337
 338   GetElementPtrInst *Gep0 = GetElementPtrInst::Create(I32Ty, PtrVecA, C2xi32a);
 339   GetElementPtrInst *Gep1 = GetElementPtrInst::Create(I32Ty, PtrVecA, C2xi32b);
 340   GetElementPtrInst *Gep2 = GetElementPtrInst::Create(I32Ty, PtrVecB, C2xi32a);
 341   GetElementPtrInst *Gep3 = GetElementPtrInst::Create(I32Ty, PtrVecB, C2xi32b);
 342
 343   CastInst *BTC0 = new BitCastInst(Gep0, V2xi8PTy);
 344   CastInst *BTC1 = new BitCastInst(Gep1, V2xi8PTy);
 345   CastInst *BTC2 = new BitCastInst(Gep2, V2xi8PTy);
 346   CastInst *BTC3 = new BitCastInst(Gep3, V2xi8PTy);
 347
 348   Value *S0 = BTC0->stripPointerCasts();
 349   Value *S1 = BTC1->stripPointerCasts();
 350   Value *S2 = BTC2->stripPointerCasts();
 351   Value *S3 = BTC3->stripPointerCasts();
 352
 353   EXPECT_NE(S0, Gep0);
 354   EXPECT_NE(S1, Gep1);
 355   EXPECT_NE(S2, Gep2);
 356   EXPECT_NE(S3, Gep3);
 357
 358   int64_t Offset;
 359   DataLayout TD("e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3"
 360                 "2:32:32-f64:64:64-v64:64:64-v128:128:128-a:0:64-s:64:64-f80"
 361                 ":128:128-n8:16:32:64-S128");
 362   // Make sure we don't crash
 363   GetPointerBaseWithConstantOffset(Gep0, Offset, TD);
 364   GetPointerBaseWithConstantOffset(Gep1, Offset, TD);
 365   GetPointerBaseWithConstantOffset(Gep2, Offset, TD);
 366   GetPointerBaseWithConstantOffset(Gep3, Offset, TD);
 367
 368   // Gep of Geps
 369   GetElementPtrInst *GepII0 = GetElementPtrInst::Create(I32Ty, Gep0, C2xi32b);
 370   GetElementPtrInst *GepII1 = GetElementPtrInst::Create(I32Ty, Gep1, C2xi32a);
 371   GetElementPtrInst *GepII2 = GetElementPtrInst::Create(I32Ty, Gep2, C2xi32b);
 372   GetElementPtrInst *GepII3 = GetElementPtrInst::Create(I32Ty, Gep3, C2xi32a);
 373
 374   EXPECT_EQ(GepII0->getNumIndices(), 1u);
 375   EXPECT_EQ(GepII1->getNumIndices(), 1u);
 376   EXPECT_EQ(GepII2->getNumIndices(), 1u);
 377   EXPECT_EQ(GepII3->getNumIndices(), 1u);
 378
 379   EXPECT_FALSE(GepII0->hasAllZeroIndices());
 380   EXPECT_FALSE(GepII1->hasAllZeroIndices());
 381   EXPECT_FALSE(GepII2->hasAllZeroIndices());
 382   EXPECT_FALSE(GepII3->hasAllZeroIndices());
 383
 384   delete GepII0;
 385   delete GepII1;
 386   delete GepII2;
 387   delete GepII3;
 388
 389   delete BTC0;
 390   delete BTC1;
 391   delete BTC2;
 392   delete BTC3;
 393
 394   delete Gep0;
 395   delete Gep1;
 396   delete Gep2;
 397   delete Gep3;
 398
 399   ICmp2->eraseFromParent();
 400   delete BB0;
 401
 402   delete ICmp0;
 403   delete ICmp1;
 404   delete PtrVecA;
 405   delete PtrVecB;
 406 }
 407
 408 TEST(InstructionsTest, FPMathOperator) {
 409   LLVMContext Context;
 410   IRBuilder<> Builder(Context);
 411   MDBuilder MDHelper(Context);
 412   Instruction *I = Builder.CreatePHI(Builder.getDoubleTy(), 0);
 413   MDNode *MD1 = MDHelper.createFPMath(1.0);
 414   Value *V1 = Builder.CreateFAdd(I, I, "", MD1);
 415   EXPECT_TRUE(isa<FPMathOperator>(V1));
 416   FPMathOperator *O1 = cast<FPMathOperator>(V1);
 417   EXPECT_EQ(O1->getFPAccuracy(), 1.0);
 418   V1->deleteValue();
 419   I->deleteValue();
 420 }
 421
 422
 423 TEST(InstructionsTest, isEliminableCastPair) {
 424   LLVMContext C;
 425
 426   Type* Int16Ty = Type::getInt16Ty(C);
 427   Type* Int32Ty = Type::getInt32Ty(C);
 428   Type* Int64Ty = Type::getInt64Ty(C);
 429   Type* Int64PtrTy = Type::getInt64PtrTy(C);
 430
 431   // Source and destination pointers have same size -> bitcast.
 432   EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::PtrToInt,
 433                                            CastInst::IntToPtr,
 434                                            Int64PtrTy, Int64Ty, Int64PtrTy,
 435                                            Int32Ty, nullptr, Int32Ty),
 436             CastInst::BitCast);
 437
 438   // Source and destination have unknown sizes, but the same address space and
 439   // the intermediate int is the maximum pointer size -> bitcast
 440   EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::PtrToInt,
 441                                            CastInst::IntToPtr,
 442                                            Int64PtrTy, Int64Ty, Int64PtrTy,
 443                                            nullptr, nullptr, nullptr),
 444             CastInst::BitCast);
 445
 446   // Source and destination have unknown sizes, but the same address space and
 447   // the intermediate int is not the maximum pointer size -> nothing
 448   EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::PtrToInt,
 449                                            CastInst::IntToPtr,
 450                                            Int64PtrTy, Int32Ty, Int64PtrTy,
 451                                            nullptr, nullptr, nullptr),
 452             0U);
 453
 454   // Middle pointer big enough -> bitcast.
 455   EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::IntToPtr,
 456                                            CastInst::PtrToInt,
 457                                            Int64Ty, Int64PtrTy, Int64Ty,
 458                                            nullptr, Int64Ty, nullptr),
 459             CastInst::BitCast);
 460
 461   // Middle pointer too small -> fail.
 462   EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::IntToPtr,
 463                                            CastInst::PtrToInt,
 464                                            Int64Ty, Int64PtrTy, Int64Ty,
 465                                            nullptr, Int32Ty, nullptr),
 466             0U);
 467
 468   // Test that we don't eliminate bitcasts between different address spaces,
 469   // or if we don't have available pointer size information.
 470   DataLayout DL("e-p:32:32:32-p1:16:16:16-p2:64:64:64-i1:8:8-i8:8:8-i16:16:16"
 471                 "-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64"
 472                 "-v128:128:128-a:0:64-s:64:64-f80:128:128-n8:16:32:64-S128");
 473
 474   Type* Int64PtrTyAS1 = Type::getInt64PtrTy(C, 1);
 475   Type* Int64PtrTyAS2 = Type::getInt64PtrTy(C, 2);
 476
 477   IntegerType *Int16SizePtr = DL.getIntPtrType(C, 1);
 478   IntegerType *Int64SizePtr = DL.getIntPtrType(C, 2);
 479
 480   // Cannot simplify inttoptr, addrspacecast
 481   EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::IntToPtr,
 482                                            CastInst::AddrSpaceCast,
 483                                            Int16Ty, Int64PtrTyAS1, Int64PtrTyAS2,
 484                                            nullptr, Int16SizePtr, Int64SizePtr),
 485             0U);
 486
 487   // Cannot simplify addrspacecast, ptrtoint
 488   EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::AddrSpaceCast,
 489                                            CastInst::PtrToInt,
 490                                            Int64PtrTyAS1, Int64PtrTyAS2, Int16Ty,
 491                                            Int64SizePtr, Int16SizePtr, nullptr),
 492             0U);
 493
 494   // Pass since the bitcast address spaces are the same
 495   EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::IntToPtr,
 496                                            CastInst::BitCast,
 497                                            Int16Ty, Int64PtrTyAS1, Int64PtrTyAS1,
 498                                            nullptr, nullptr, nullptr),
 499             CastInst::IntToPtr);
 500
 501 }
 502
 503 TEST(InstructionsTest, CloneCall) {
 504   LLVMContext C;
 505   Type *Int32Ty = Type::getInt32Ty(C);
 506   Type *ArgTys[] = {Int32Ty, Int32Ty, Int32Ty};
 507   FunctionType *FnTy = FunctionType::get(Int32Ty, ArgTys, /*isVarArg=*/false);
 508   Value *Callee = Constant::getNullValue(FnTy->getPointerTo());
 509   Value *Args[] = {
 510     ConstantInt::get(Int32Ty, 1),
 511     ConstantInt::get(Int32Ty, 2),
 512     ConstantInt::get(Int32Ty, 3)
 513   };
 514   std::unique_ptr<CallInst> Call(
 515       CallInst::Create(FnTy, Callee, Args, "result"));
 516
 517   // Test cloning the tail call kind.
 518   CallInst::TailCallKind Kinds[] = {CallInst::TCK_None, CallInst::TCK_Tail,
 519                                     CallInst::TCK_MustTail};
 520   for (CallInst::TailCallKind TCK : Kinds) {
 521     Call->setTailCallKind(TCK);
 522     std::unique_ptr<CallInst> Clone(cast<CallInst>(Call->clone()));
 523     EXPECT_EQ(Call->getTailCallKind(), Clone->getTailCallKind());
 524   }
 525   Call->setTailCallKind(CallInst::TCK_None);
 526
 527   // Test cloning an attribute.
 528   {
 529     AttrBuilder AB;
 530     AB.addAttribute(Attribute::ReadOnly);
 531     Call->setAttributes(
 532         AttributeList::get(C, AttributeList::FunctionIndex, AB));
 533     std::unique_ptr<CallInst> Clone(cast<CallInst>(Call->clone()));
 534     EXPECT_TRUE(Clone->onlyReadsMemory());
 535   }
 536 }
 537
 538 TEST(InstructionsTest, AlterCallBundles) {
 539   LLVMContext C;
 540   Type *Int32Ty = Type::getInt32Ty(C);
 541   FunctionType *FnTy = FunctionType::get(Int32Ty, Int32Ty, /*isVarArg=*/false);
 542   Value *Callee = Constant::getNullValue(FnTy->getPointerTo());
 543   Value *Args[] = {ConstantInt::get(Int32Ty, 42)};
 544   OperandBundleDef OldBundle("before", UndefValue::get(Int32Ty));
 545   std::unique_ptr<CallInst> Call(
 546       CallInst::Create(FnTy, Callee, Args, OldBundle, "result"));
 547   Call->setTailCallKind(CallInst::TailCallKind::TCK_NoTail);
 548   AttrBuilder AB;
 549   AB.addAttribute(Attribute::Cold);
 550   Call->setAttributes(AttributeList::get(C, AttributeList::FunctionIndex, AB));
 551   Call->setDebugLoc(DebugLoc(MDNode::get(C, None)));
 552
 553   OperandBundleDef NewBundle("after", ConstantInt::get(Int32Ty, 7));
 554   std::unique_ptr<CallInst> Clone(CallInst::Create(Call.get(), NewBundle));
 555   EXPECT_EQ(Call->getNumArgOperands(), Clone->getNumArgOperands());
 556   EXPECT_EQ(Call->getArgOperand(0), Clone->getArgOperand(0));
 557   EXPECT_EQ(Call->getCallingConv(), Clone->getCallingConv());
 558   EXPECT_EQ(Call->getTailCallKind(), Clone->getTailCallKind());
 559   EXPECT_TRUE(Clone->hasFnAttr(Attribute::AttrKind::Cold));
 560   EXPECT_EQ(Call->getDebugLoc(), Clone->getDebugLoc());
 561   EXPECT_EQ(Clone->getNumOperandBundles(), 1U);
 562   EXPECT_TRUE(Clone->getOperandBundle("after").hasValue());
 563 }
 564
 565 TEST(InstructionsTest, AlterInvokeBundles) {
 566   LLVMContext C;
 567   Type *Int32Ty = Type::getInt32Ty(C);
 568   FunctionType *FnTy = FunctionType::get(Int32Ty, Int32Ty, /*isVarArg=*/false);
 569   Value *Callee = Constant::getNullValue(FnTy->getPointerTo());
 570   Value *Args[] = {ConstantInt::get(Int32Ty, 42)};
 571   std::unique_ptr<BasicBlock> NormalDest(BasicBlock::Create(C));
 572   std::unique_ptr<BasicBlock> UnwindDest(BasicBlock::Create(C));
 573   OperandBundleDef OldBundle("before", UndefValue::get(Int32Ty));
 574   std::unique_ptr<InvokeInst> Invoke(
 575       InvokeInst::Create(FnTy, Callee, NormalDest.get(), UnwindDest.get(), Args,
 576                          OldBundle, "result"));
 577   AttrBuilder AB;
 578   AB.addAttribute(Attribute::Cold);
 579   Invoke->setAttributes(
 580       AttributeList::get(C, AttributeList::FunctionIndex, AB));
 581   Invoke->setDebugLoc(DebugLoc(MDNode::get(C, None)));
 582
 583   OperandBundleDef NewBundle("after", ConstantInt::get(Int32Ty, 7));
 584   std::unique_ptr<InvokeInst> Clone(
 585       InvokeInst::Create(Invoke.get(), NewBundle));
 586   EXPECT_EQ(Invoke->getNormalDest(), Clone->getNormalDest());
 587   EXPECT_EQ(Invoke->getUnwindDest(), Clone->getUnwindDest());
 588   EXPECT_EQ(Invoke->getNumArgOperands(), Clone->getNumArgOperands());
 589   EXPECT_EQ(Invoke->getArgOperand(0), Clone->getArgOperand(0));
 590   EXPECT_EQ(Invoke->getCallingConv(), Clone->getCallingConv());
 591   EXPECT_TRUE(Clone->hasFnAttr(Attribute::AttrKind::Cold));
 592   EXPECT_EQ(Invoke->getDebugLoc(), Clone->getDebugLoc());
 593   EXPECT_EQ(Clone->getNumOperandBundles(), 1U);
 594   EXPECT_TRUE(Clone->getOperandBundle("after").hasValue());
 595 }
 596
 597 TEST_F(ModuleWithFunctionTest, DropPoisonGeneratingFlags) {
 598   auto *OnlyBB = BasicBlock::Create(Ctx, "bb", F);
 599   auto *Arg0 = &*F->arg_begin();
 600
 601   IRBuilder<NoFolder> B(Ctx);
 602   B.SetInsertPoint(OnlyBB);
 603
 604   {
 605     auto *UI =
 606         cast<Instruction>(B.CreateUDiv(Arg0, Arg0, "", /*isExact*/ true));
 607     ASSERT_TRUE(UI->isExact());
 608     UI->dropPoisonGeneratingFlags();
 609     ASSERT_FALSE(UI->isExact());
 610   }
 611
 612   {
 613     auto *ShrI =
 614         cast<Instruction>(B.CreateLShr(Arg0, Arg0, "", /*isExact*/ true));
 615     ASSERT_TRUE(ShrI->isExact());
 616     ShrI->dropPoisonGeneratingFlags();
 617     ASSERT_FALSE(ShrI->isExact());
 618   }
 619
 620   {
 621     auto *AI = cast<Instruction>(
 622         B.CreateAdd(Arg0, Arg0, "", /*HasNUW*/ true, /*HasNSW*/ false));
 623     ASSERT_TRUE(AI->hasNoUnsignedWrap());
 624     AI->dropPoisonGeneratingFlags();
 625     ASSERT_FALSE(AI->hasNoUnsignedWrap());
 626     ASSERT_FALSE(AI->hasNoSignedWrap());
 627   }
 628
 629   {
 630     auto *SI = cast<Instruction>(
 631         B.CreateAdd(Arg0, Arg0, "", /*HasNUW*/ false, /*HasNSW*/ true));
 632     ASSERT_TRUE(SI->hasNoSignedWrap());
 633     SI->dropPoisonGeneratingFlags();
 634     ASSERT_FALSE(SI->hasNoUnsignedWrap());
 635     ASSERT_FALSE(SI->hasNoSignedWrap());
 636   }
 637
 638   {
 639     auto *ShlI = cast<Instruction>(
 640         B.CreateShl(Arg0, Arg0, "", /*HasNUW*/ true, /*HasNSW*/ true));
 641     ASSERT_TRUE(ShlI->hasNoSignedWrap());
 642     ASSERT_TRUE(ShlI->hasNoUnsignedWrap());
 643     ShlI->dropPoisonGeneratingFlags();
 644     ASSERT_FALSE(ShlI->hasNoUnsignedWrap());
 645     ASSERT_FALSE(ShlI->hasNoSignedWrap());
 646   }
 647
 648   {
 649     Value *GEPBase = Constant::getNullValue(B.getInt8PtrTy());
 650     auto *GI = cast<GetElementPtrInst>(
 651         B.CreateInBoundsGEP(B.getInt8Ty(), GEPBase, Arg0));
 652     ASSERT_TRUE(GI->isInBounds());
 653     GI->dropPoisonGeneratingFlags();
 654     ASSERT_FALSE(GI->isInBounds());
 655   }
 656 }
 657
 658 TEST(InstructionsTest, GEPIndices) {
 659   LLVMContext Context;
 660   IRBuilder<NoFolder> Builder(Context);
 661   Type *ElementTy = Builder.getInt8Ty();
 662   Type *ArrTy = ArrayType::get(ArrayType::get(ElementTy, 64), 64);
 663   Value *Indices[] = {
 664     Builder.getInt32(0),
 665     Builder.getInt32(13),
 666     Builder.getInt32(42) };
 667
 668   Value *V = Builder.CreateGEP(ArrTy, UndefValue::get(PointerType::getUnqual(ArrTy)),
 669                                Indices);
 670   ASSERT_TRUE(isa<GetElementPtrInst>(V));
 671
 672   auto *GEPI = cast<GetElementPtrInst>(V);
 673   ASSERT_NE(GEPI->idx_begin(), GEPI->idx_end());
 674   ASSERT_EQ(GEPI->idx_end(), std::next(GEPI->idx_begin(), 3));
 675   EXPECT_EQ(Indices[0], GEPI->idx_begin()[0]);
 676   EXPECT_EQ(Indices[1], GEPI->idx_begin()[1]);
 677   EXPECT_EQ(Indices[2], GEPI->idx_begin()[2]);
 678   EXPECT_EQ(GEPI->idx_begin(), GEPI->indices().begin());
 679   EXPECT_EQ(GEPI->idx_end(), GEPI->indices().end());
 680
 681   const auto *CGEPI = GEPI;
 682   ASSERT_NE(CGEPI->idx_begin(), CGEPI->idx_end());
 683   ASSERT_EQ(CGEPI->idx_end(), std::next(CGEPI->idx_begin(), 3));
 684   EXPECT_EQ(Indices[0], CGEPI->idx_begin()[0]);
 685   EXPECT_EQ(Indices[1], CGEPI->idx_begin()[1]);
 686   EXPECT_EQ(Indices[2], CGEPI->idx_begin()[2]);
 687   EXPECT_EQ(CGEPI->idx_begin(), CGEPI->indices().begin());
 688   EXPECT_EQ(CGEPI->idx_end(), CGEPI->indices().end());
 689
 690   delete GEPI;
 691 }
 692
 693 TEST(InstructionsTest, SwitchInst) {
 694   LLVMContext C;
 695
 696   std::unique_ptr<BasicBlock> BB1, BB2, BB3;
 697   BB1.reset(BasicBlock::Create(C));
 698   BB2.reset(BasicBlock::Create(C));
 699   BB3.reset(BasicBlock::Create(C));
 700
 701   // We create block 0 after the others so that it gets destroyed first and
 702   // clears the uses of the other basic blocks.
 703   std::unique_ptr<BasicBlock> BB0(BasicBlock::Create(C));
 704
 705   auto *Int32Ty = Type::getInt32Ty(C);
 706
 707   SwitchInst *SI =
 708       SwitchInst::Create(UndefValue::get(Int32Ty), BB0.get(), 3, BB0.get());
 709   SI->addCase(ConstantInt::get(Int32Ty, 1), BB1.get());
 710   SI->addCase(ConstantInt::get(Int32Ty, 2), BB2.get());
 711   SI->addCase(ConstantInt::get(Int32Ty, 3), BB3.get());
 712
 713   auto CI = SI->case_begin();
 714   ASSERT_NE(CI, SI->case_end());
 715   EXPECT_EQ(1, CI->getCaseValue()->getSExtValue());
 716   EXPECT_EQ(BB1.get(), CI->getCaseSuccessor());
 717   EXPECT_EQ(2, (CI + 1)->getCaseValue()->getSExtValue());
 718   EXPECT_EQ(BB2.get(), (CI + 1)->getCaseSuccessor());
 719   EXPECT_EQ(3, (CI + 2)->getCaseValue()->getSExtValue());
 720   EXPECT_EQ(BB3.get(), (CI + 2)->getCaseSuccessor());
 721   EXPECT_EQ(CI + 1, std::next(CI));
 722   EXPECT_EQ(CI + 2, std::next(CI, 2));
 723   EXPECT_EQ(CI + 3, std::next(CI, 3));
 724   EXPECT_EQ(SI->case_end(), CI + 3);
 725   EXPECT_EQ(0, CI - CI);
 726   EXPECT_EQ(1, (CI + 1) - CI);
 727   EXPECT_EQ(2, (CI + 2) - CI);
 728   EXPECT_EQ(3, SI->case_end() - CI);
 729   EXPECT_EQ(3, std::distance(CI, SI->case_end()));
 730
 731   auto CCI = const_cast<const SwitchInst *>(SI)->case_begin();
 732   SwitchInst::ConstCaseIt CCE = SI->case_end();
 733   ASSERT_NE(CCI, SI->case_end());
 734   EXPECT_EQ(1, CCI->getCaseValue()->getSExtValue());
 735   EXPECT_EQ(BB1.get(), CCI->getCaseSuccessor());
 736   EXPECT_EQ(2, (CCI + 1)->getCaseValue()->getSExtValue());
 737   EXPECT_EQ(BB2.get(), (CCI + 1)->getCaseSuccessor());
 738   EXPECT_EQ(3, (CCI + 2)->getCaseValue()->getSExtValue());
 739   EXPECT_EQ(BB3.get(), (CCI + 2)->getCaseSuccessor());
 740   EXPECT_EQ(CCI + 1, std::next(CCI));
 741   EXPECT_EQ(CCI + 2, std::next(CCI, 2));
 742   EXPECT_EQ(CCI + 3, std::next(CCI, 3));
 743   EXPECT_EQ(CCE, CCI + 3);
 744   EXPECT_EQ(0, CCI - CCI);
 745   EXPECT_EQ(1, (CCI + 1) - CCI);
 746   EXPECT_EQ(2, (CCI + 2) - CCI);
 747   EXPECT_EQ(3, CCE - CCI);
 748   EXPECT_EQ(3, std::distance(CCI, CCE));
 749
 750   // Make sure that the const iterator is compatible with a const auto ref.
 751   const auto &Handle = *CCI;
 752   EXPECT_EQ(1, Handle.getCaseValue()->getSExtValue());
 753   EXPECT_EQ(BB1.get(), Handle.getCaseSuccessor());
 754 }
 755
 756 TEST(InstructionsTest, CommuteShuffleMask) {
 757   SmallVector<int, 16> Indices({-1, 0, 7});
 758   ShuffleVectorInst::commuteShuffleMask(Indices, 4);
 759   EXPECT_THAT(Indices, testing::ContainerEq(ArrayRef<int>({-1, 4, 3})));
 760 }
 761
 762 TEST(InstructionsTest, ShuffleMaskQueries) {
 763   // Create the elements for various constant vectors.
 764   LLVMContext Ctx;
 765   Type *Int32Ty = Type::getInt32Ty(Ctx);
 766   Constant *CU = UndefValue::get(Int32Ty);
 767   Constant *C0 = ConstantInt::get(Int32Ty, 0);
 768   Constant *C1 = ConstantInt::get(Int32Ty, 1);
 769   Constant *C2 = ConstantInt::get(Int32Ty, 2);
 770   Constant *C3 = ConstantInt::get(Int32Ty, 3);
 771   Constant *C4 = ConstantInt::get(Int32Ty, 4);
 772   Constant *C5 = ConstantInt::get(Int32Ty, 5);
 773   Constant *C6 = ConstantInt::get(Int32Ty, 6);
 774   Constant *C7 = ConstantInt::get(Int32Ty, 7);
 775
 776   Constant *Identity = ConstantVector::get({C0, CU, C2, C3, C4});
 777   EXPECT_TRUE(ShuffleVectorInst::isIdentityMask(Identity));
 778   EXPECT_FALSE(ShuffleVectorInst::isSelectMask(Identity)); // identity is distinguished from select
 779   EXPECT_FALSE(ShuffleVectorInst::isReverseMask(Identity));
 780   EXPECT_TRUE(ShuffleVectorInst::isSingleSourceMask(Identity)); // identity is always single source
 781   EXPECT_FALSE(ShuffleVectorInst::isZeroEltSplatMask(Identity));
 782   EXPECT_FALSE(ShuffleVectorInst::isTransposeMask(Identity));
 783
 784   Constant *Select = ConstantVector::get({CU, C1, C5});
 785   EXPECT_FALSE(ShuffleVectorInst::isIdentityMask(Select));
 786   EXPECT_TRUE(ShuffleVectorInst::isSelectMask(Select));
 787   EXPECT_FALSE(ShuffleVectorInst::isReverseMask(Select));
 788   EXPECT_FALSE(ShuffleVectorInst::isSingleSourceMask(Select));
 789   EXPECT_FALSE(ShuffleVectorInst::isZeroEltSplatMask(Select));
 790   EXPECT_FALSE(ShuffleVectorInst::isTransposeMask(Select));
 791
 792   Constant *Reverse = ConstantVector::get({C3, C2, C1, CU});
 793   EXPECT_FALSE(ShuffleVectorInst::isIdentityMask(Reverse));
 794   EXPECT_FALSE(ShuffleVectorInst::isSelectMask(Reverse));
 795   EXPECT_TRUE(ShuffleVectorInst::isReverseMask(Reverse));
 796   EXPECT_TRUE(ShuffleVectorInst::isSingleSourceMask(Reverse)); // reverse is always single source
 797   EXPECT_FALSE(ShuffleVectorInst::isZeroEltSplatMask(Reverse));
 798   EXPECT_FALSE(ShuffleVectorInst::isTransposeMask(Reverse));
 799
 800   Constant *SingleSource = ConstantVector::get({C2, C2, C0, CU});
 801   EXPECT_FALSE(ShuffleVectorInst::isIdentityMask(SingleSource));
 802   EXPECT_FALSE(ShuffleVectorInst::isSelectMask(SingleSource));
 803   EXPECT_FALSE(ShuffleVectorInst::isReverseMask(SingleSource));
 804   EXPECT_TRUE(ShuffleVectorInst::isSingleSourceMask(SingleSource));
 805   EXPECT_FALSE(ShuffleVectorInst::isZeroEltSplatMask(SingleSource));
 806   EXPECT_FALSE(ShuffleVectorInst::isTransposeMask(SingleSource));
 807
 808   Constant *ZeroEltSplat = ConstantVector::get({C0, C0, CU, C0});
 809   EXPECT_FALSE(ShuffleVectorInst::isIdentityMask(ZeroEltSplat));
 810   EXPECT_FALSE(ShuffleVectorInst::isSelectMask(ZeroEltSplat));
 811   EXPECT_FALSE(ShuffleVectorInst::isReverseMask(ZeroEltSplat));
 812   EXPECT_TRUE(ShuffleVectorInst::isSingleSourceMask(ZeroEltSplat)); // 0-splat is always single source
 813   EXPECT_TRUE(ShuffleVectorInst::isZeroEltSplatMask(ZeroEltSplat));
 814   EXPECT_FALSE(ShuffleVectorInst::isTransposeMask(ZeroEltSplat));
 815
 816   Constant *Transpose = ConstantVector::get({C0, C4, C2, C6});
 817   EXPECT_FALSE(ShuffleVectorInst::isIdentityMask(Transpose));
 818   EXPECT_FALSE(ShuffleVectorInst::isSelectMask(Transpose));
 819   EXPECT_FALSE(ShuffleVectorInst::isReverseMask(Transpose));
 820   EXPECT_FALSE(ShuffleVectorInst::isSingleSourceMask(Transpose));
 821   EXPECT_FALSE(ShuffleVectorInst::isZeroEltSplatMask(Transpose));
 822   EXPECT_TRUE(ShuffleVectorInst::isTransposeMask(Transpose));
 823
 824   // More tests to make sure the logic is/stays correct...
 825   EXPECT_TRUE(ShuffleVectorInst::isIdentityMask(ConstantVector::get({CU, C1, CU, C3})));
 826   EXPECT_TRUE(ShuffleVectorInst::isIdentityMask(ConstantVector::get({C4, CU, C6, CU})));
 827
 828   EXPECT_TRUE(ShuffleVectorInst::isSelectMask(ConstantVector::get({C4, C1, C6, CU})));
 829   EXPECT_TRUE(ShuffleVectorInst::isSelectMask(ConstantVector::get({CU, C1, C6, C3})));
 830
 831   EXPECT_TRUE(ShuffleVectorInst::isReverseMask(ConstantVector::get({C7, C6, CU, C4})));
 832   EXPECT_TRUE(ShuffleVectorInst::isReverseMask(ConstantVector::get({C3, CU, C1, CU})));
 833
 834   EXPECT_TRUE(ShuffleVectorInst::isSingleSourceMask(ConstantVector::get({C7, C5, CU, C7})));
 835   EXPECT_TRUE(ShuffleVectorInst::isSingleSourceMask(ConstantVector::get({C3, C0, CU, C3})));
 836
 837   EXPECT_TRUE(ShuffleVectorInst::isZeroEltSplatMask(ConstantVector::get({C4, CU, CU, C4})));
 838   EXPECT_TRUE(ShuffleVectorInst::isZeroEltSplatMask(ConstantVector::get({CU, C0, CU, C0})));
 839
 840   EXPECT_TRUE(ShuffleVectorInst::isTransposeMask(ConstantVector::get({C1, C5, C3, C7})));
 841   EXPECT_TRUE(ShuffleVectorInst::isTransposeMask(ConstantVector::get({C1, C3})));
 842
 843   // Nothing special about the values here - just re-using inputs to reduce code.
 844   Constant *V0 = ConstantVector::get({C0, C1, C2, C3});
 845   Constant *V1 = ConstantVector::get({C3, C2, C1, C0});
 846
 847   // Identity with undef elts.
 848   ShuffleVectorInst *Id1 = new ShuffleVectorInst(V0, V1,
 849                                                  ConstantVector::get({C0, C1, CU, CU}));
 850   EXPECT_TRUE(Id1->isIdentity());
 851   EXPECT_FALSE(Id1->isIdentityWithPadding());
 852   EXPECT_FALSE(Id1->isIdentityWithExtract());
 853   EXPECT_FALSE(Id1->isConcat());
 854   delete Id1;
 855
 856   // Result has less elements than operands.
 857   ShuffleVectorInst *Id2 = new ShuffleVectorInst(V0, V1,
 858                                                  ConstantVector::get({C0, C1, C2}));
 859   EXPECT_FALSE(Id2->isIdentity());
 860   EXPECT_FALSE(Id2->isIdentityWithPadding());
 861   EXPECT_TRUE(Id2->isIdentityWithExtract());
 862   EXPECT_FALSE(Id2->isConcat());
 863   delete Id2;
 864
 865   // Result has less elements than operands; choose from Op1.
 866   ShuffleVectorInst *Id3 = new ShuffleVectorInst(V0, V1,
 867                                                  ConstantVector::get({C4, CU, C6}));
 868   EXPECT_FALSE(Id3->isIdentity());
 869   EXPECT_FALSE(Id3->isIdentityWithPadding());
 870   EXPECT_TRUE(Id3->isIdentityWithExtract());
 871   EXPECT_FALSE(Id3->isConcat());
 872   delete Id3;
 873
 874   // Result has less elements than operands; choose from Op0 and Op1 is not identity.
 875   ShuffleVectorInst *Id4 = new ShuffleVectorInst(V0, V1,
 876                                                  ConstantVector::get({C4, C1, C6}));
 877   EXPECT_FALSE(Id4->isIdentity());
 878   EXPECT_FALSE(Id4->isIdentityWithPadding());
 879   EXPECT_FALSE(Id4->isIdentityWithExtract());
 880   EXPECT_FALSE(Id4->isConcat());
 881   delete Id4;
 882
 883   // Result has more elements than operands, and extra elements are undef.
 884   ShuffleVectorInst *Id5 = new ShuffleVectorInst(V0, V1,
 885                                                  ConstantVector::get({CU, C1, C2, C3, CU, CU}));
 886   EXPECT_FALSE(Id5->isIdentity());
 887   EXPECT_TRUE(Id5->isIdentityWithPadding());
 888   EXPECT_FALSE(Id5->isIdentityWithExtract());
 889   EXPECT_FALSE(Id5->isConcat());
 890   delete Id5;
 891
 892   // Result has more elements than operands, and extra elements are undef; choose from Op1.
 893   ShuffleVectorInst *Id6 = new ShuffleVectorInst(V0, V1,
 894                                                  ConstantVector::get({C4, C5, C6, CU, CU, CU}));
 895   EXPECT_FALSE(Id6->isIdentity());
 896   EXPECT_TRUE(Id6->isIdentityWithPadding());
 897   EXPECT_FALSE(Id6->isIdentityWithExtract());
 898   EXPECT_FALSE(Id6->isConcat());
 899   delete Id6;
 900
 901   // Result has more elements than operands, but extra elements are not undef.
 902   ShuffleVectorInst *Id7 = new ShuffleVectorInst(V0, V1,
 903                                                  ConstantVector::get({C0, C1, C2, C3, CU, C1}));
 904   EXPECT_FALSE(Id7->isIdentity());
 905   EXPECT_FALSE(Id7->isIdentityWithPadding());
 906   EXPECT_FALSE(Id7->isIdentityWithExtract());
 907   EXPECT_FALSE(Id7->isConcat());
 908   delete Id7;
 909
 910   // Result has more elements than operands; choose from Op0 and Op1 is not identity.
 911   ShuffleVectorInst *Id8 = new ShuffleVectorInst(V0, V1,
 912                                                  ConstantVector::get({C4, CU, C2, C3, CU, CU}));
 913   EXPECT_FALSE(Id8->isIdentity());
 914   EXPECT_FALSE(Id8->isIdentityWithPadding());
 915   EXPECT_FALSE(Id8->isIdentityWithExtract());
 916   EXPECT_FALSE(Id8->isConcat());
 917   delete Id8;
 918
 919   // Result has twice as many elements as operands; choose consecutively from Op0 and Op1 is concat.
 920   ShuffleVectorInst *Id9 = new ShuffleVectorInst(V0, V1,
 921                                                  ConstantVector::get({C0, CU, C2, C3, CU, CU, C6, C7}));
 922   EXPECT_FALSE(Id9->isIdentity());
 923   EXPECT_FALSE(Id9->isIdentityWithPadding());
 924   EXPECT_FALSE(Id9->isIdentityWithExtract());
 925   EXPECT_TRUE(Id9->isConcat());
 926   delete Id9;
 927
 928   // Result has less than twice as many elements as operands, so not a concat.
 929   ShuffleVectorInst *Id10 = new ShuffleVectorInst(V0, V1,
 930                                                   ConstantVector::get({C0, CU, C2, C3, CU, CU, C6}));
 931   EXPECT_FALSE(Id10->isIdentity());
 932   EXPECT_FALSE(Id10->isIdentityWithPadding());
 933   EXPECT_FALSE(Id10->isIdentityWithExtract());
 934   EXPECT_FALSE(Id10->isConcat());
 935   delete Id10;
 936
 937   // Result has more than twice as many elements as operands, so not a concat.
 938   ShuffleVectorInst *Id11 = new ShuffleVectorInst(V0, V1,
 939                                                   ConstantVector::get({C0, CU, C2, C3, CU, CU, C6, C7, CU}));
 940   EXPECT_FALSE(Id11->isIdentity());
 941   EXPECT_FALSE(Id11->isIdentityWithPadding());
 942   EXPECT_FALSE(Id11->isIdentityWithExtract());
 943   EXPECT_FALSE(Id11->isConcat());
 944   delete Id11;
 945
 946   // If an input is undef, it's not a concat.
 947   // TODO: IdentityWithPadding should be true here even though the high mask values are not undef.
 948   ShuffleVectorInst *Id12 = new ShuffleVectorInst(V0, ConstantVector::get({CU, CU, CU, CU}),
 949                                                   ConstantVector::get({C0, CU, C2, C3, CU, CU, C6, C7}));
 950   EXPECT_FALSE(Id12->isIdentity());
 951   EXPECT_FALSE(Id12->isIdentityWithPadding());
 952   EXPECT_FALSE(Id12->isIdentityWithExtract());
 953   EXPECT_FALSE(Id12->isConcat());
 954   delete Id12;
 955 }
 956
 957 TEST(InstructionsTest, SkipDebug) {
 958   LLVMContext C;
 959   std::unique_ptr<Module> M = parseIR(C,
 960                                       R"(
 961       declare void @llvm.dbg.value(metadata, metadata, metadata)
 962
 963       define void @f() {
 964       entry:
 965         call void @llvm.dbg.value(metadata i32 0, metadata !11, metadata !DIExpression()), !dbg !13
 966         ret void
 967       }
 968
 969       !llvm.dbg.cu = !{!0}
 970       !llvm.module.flags = !{!3, !4}
 971       !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
 972       !1 = !DIFile(filename: "t2.c", directory: "foo")
 973       !2 = !{}
 974       !3 = !{i32 2, !"Dwarf Version", i32 4}
 975       !4 = !{i32 2, !"Debug Info Version", i32 3}
 976       !8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: false, unit: !0, retainedNodes: !2)
 977       !9 = !DISubroutineType(types: !10)
 978       !10 = !{null}
 979       !11 = !DILocalVariable(name: "x", scope: !8, file: !1, line: 2, type: !12)
 980       !12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
 981       !13 = !DILocation(line: 2, column: 7, scope: !8)
 982   )");
 983   ASSERT_TRUE(M);
 984   Function *F = cast<Function>(M->getNamedValue("f"));
 985   BasicBlock &BB = F->front();
 986
 987   // The first non-debug instruction is the terminator.
 988   auto *Term = BB.getTerminator();
 989   EXPECT_EQ(Term, BB.begin()->getNextNonDebugInstruction());
 990   EXPECT_EQ(Term->getIterator(), skipDebugIntrinsics(BB.begin()));
 991
 992   // After the terminator, there are no non-debug instructions.
 993   EXPECT_EQ(nullptr, Term->getNextNonDebugInstruction());
 994 }
 995
 996 } // end anonymous namespace
 997 } // end namespace llvm