xref: /external/llvm/unittests/IR/InstructionsTest.cpp

//===- llvm/unittest/IR/InstructionsTest.cpp - Instructions unit tests ----===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "llvm/IR/Instructions.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Operator.h"
#include "gtest/gtest.h"
#include <memory>

namespace llvm {
namespace {

TEST(InstructionsTest, ReturnInst) {
  LLVMContext &C(getGlobalContext());

  // test for PR6589
  const ReturnInst* r0 = ReturnInst::Create(C);
  EXPECT_EQ(r0->getNumOperands(), 0U);
  EXPECT_EQ(r0->op_begin(), r0->op_end());

  IntegerType* Int1 = IntegerType::get(C, 1);
  Constant* One = ConstantInt::get(Int1, 1, true);
  const ReturnInst* r1 = ReturnInst::Create(C, One);
  EXPECT_EQ(1U, r1->getNumOperands());
  User::const_op_iterator b(r1->op_begin());
  EXPECT_NE(r1->op_end(), b);
  EXPECT_EQ(One, *b);
  EXPECT_EQ(One, r1->getOperand(0));
  ++b;
  EXPECT_EQ(r1->op_end(), b);

  // clean up
  delete r0;
  delete r1;
}

// Test fixture that provides a module and a single function within it. Useful
// for tests that need to refer to the function in some way.
class ModuleWithFunctionTest : public testing::Test {
protected:
  ModuleWithFunctionTest() : M(new Module("MyModule", Ctx)) {
    FArgTypes.push_back(Type::getInt8Ty(Ctx));
    FArgTypes.push_back(Type::getInt32Ty(Ctx));
    FArgTypes.push_back(Type::getInt64Ty(Ctx));
    FunctionType *FTy =
        FunctionType::get(Type::getVoidTy(Ctx), FArgTypes, false);
    F = Function::Create(FTy, Function::ExternalLinkage, "", M.get());
  }

  LLVMContext Ctx;
  std::unique_ptr<Module> M;
  SmallVector<Type *, 3> FArgTypes;
  Function *F;
};

TEST_F(ModuleWithFunctionTest, CallInst) {
  Value *Args[] = {ConstantInt::get(Type::getInt8Ty(Ctx), 20),
                   ConstantInt::get(Type::getInt32Ty(Ctx), 9999),
                   ConstantInt::get(Type::getInt64Ty(Ctx), 42)};
  std::unique_ptr<CallInst> Call(CallInst::Create(F, Args));

  // Make sure iteration over a call's arguments works as expected.
  unsigned Idx = 0;
  for (Value *Arg : Call->arg_operands()) {
    EXPECT_EQ(FArgTypes[Idx], Arg->getType());
    EXPECT_EQ(Call->getArgOperand(Idx)->getType(), Arg->getType());
    Idx++;
  }
}

TEST_F(ModuleWithFunctionTest, InvokeInst) {
  BasicBlock *BB1 = BasicBlock::Create(Ctx, "", F);
  BasicBlock *BB2 = BasicBlock::Create(Ctx, "", F);

  Value *Args[] = {ConstantInt::get(Type::getInt8Ty(Ctx), 20),
                   ConstantInt::get(Type::getInt32Ty(Ctx), 9999),
                   ConstantInt::get(Type::getInt64Ty(Ctx), 42)};
  std::unique_ptr<InvokeInst> Invoke(InvokeInst::Create(F, BB1, BB2, Args));

  // Make sure iteration over invoke's arguments works as expected.
  unsigned Idx = 0;
  for (Value *Arg : Invoke->arg_operands()) {
    EXPECT_EQ(FArgTypes[Idx], Arg->getType());
    EXPECT_EQ(Invoke->getArgOperand(Idx)->getType(), Arg->getType());
    Idx++;
  }
}

TEST(InstructionsTest, BranchInst) {
  LLVMContext &C(getGlobalContext());

  // Make a BasicBlocks
  BasicBlock* bb0 = BasicBlock::Create(C);
  BasicBlock* bb1 = BasicBlock::Create(C);

  // Mandatory BranchInst
  const BranchInst* b0 = BranchInst::Create(bb0);

  EXPECT_TRUE(b0->isUnconditional());
  EXPECT_FALSE(b0->isConditional());
  EXPECT_EQ(1U, b0->getNumSuccessors());

  // check num operands
  EXPECT_EQ(1U, b0->getNumOperands());

  EXPECT_NE(b0->op_begin(), b0->op_end());
  EXPECT_EQ(b0->op_end(), std::next(b0->op_begin()));

  EXPECT_EQ(b0->op_end(), std::next(b0->op_begin()));

  IntegerType* Int1 = IntegerType::get(C, 1);
  Constant* One = ConstantInt::get(Int1, 1, true);

  // Conditional BranchInst
  BranchInst* b1 = BranchInst::Create(bb0, bb1, One);

  EXPECT_FALSE(b1->isUnconditional());
  EXPECT_TRUE(b1->isConditional());
  EXPECT_EQ(2U, b1->getNumSuccessors());

  // check num operands
  EXPECT_EQ(3U, b1->getNumOperands());

  User::const_op_iterator b(b1->op_begin());

  // check COND
  EXPECT_NE(b, b1->op_end());
  EXPECT_EQ(One, *b);
  EXPECT_EQ(One, b1->getOperand(0));
  EXPECT_EQ(One, b1->getCondition());
  ++b;

  // check ELSE
  EXPECT_EQ(bb1, *b);
  EXPECT_EQ(bb1, b1->getOperand(1));
  EXPECT_EQ(bb1, b1->getSuccessor(1));
  ++b;

  // check THEN
  EXPECT_EQ(bb0, *b);
  EXPECT_EQ(bb0, b1->getOperand(2));
  EXPECT_EQ(bb0, b1->getSuccessor(0));
  ++b;

  EXPECT_EQ(b1->op_end(), b);

  // clean up
  delete b0;
  delete b1;

  delete bb0;
  delete bb1;
}

TEST(InstructionsTest, CastInst) {
  LLVMContext &C(getGlobalContext());

  Type *Int8Ty = Type::getInt8Ty(C);
  Type *Int16Ty = Type::getInt16Ty(C);
  Type *Int32Ty = Type::getInt32Ty(C);
  Type *Int64Ty = Type::getInt64Ty(C);
  Type *V8x8Ty = VectorType::get(Int8Ty, 8);
  Type *V8x64Ty = VectorType::get(Int64Ty, 8);
  Type *X86MMXTy = Type::getX86_MMXTy(C);

  Type *HalfTy = Type::getHalfTy(C);
  Type *FloatTy = Type::getFloatTy(C);
  Type *DoubleTy = Type::getDoubleTy(C);

  Type *V2Int32Ty = VectorType::get(Int32Ty, 2);
  Type *V2Int64Ty = VectorType::get(Int64Ty, 2);
  Type *V4Int16Ty = VectorType::get(Int16Ty, 4);

  Type *Int32PtrTy = PointerType::get(Int32Ty, 0);
  Type *Int64PtrTy = PointerType::get(Int64Ty, 0);

  Type *Int32PtrAS1Ty = PointerType::get(Int32Ty, 1);
  Type *Int64PtrAS1Ty = PointerType::get(Int64Ty, 1);

  Type *V2Int32PtrAS1Ty = VectorType::get(Int32PtrAS1Ty, 2);
  Type *V2Int64PtrAS1Ty = VectorType::get(Int64PtrAS1Ty, 2);
  Type *V4Int32PtrAS1Ty = VectorType::get(Int32PtrAS1Ty, 4);
  Type *V4Int64PtrAS1Ty = VectorType::get(Int64PtrAS1Ty, 4);

  Type *V2Int64PtrTy = VectorType::get(Int64PtrTy, 2);
  Type *V2Int32PtrTy = VectorType::get(Int32PtrTy, 2);
  Type *V4Int32PtrTy = VectorType::get(Int32PtrTy, 4);

  const Constant* c8 = Constant::getNullValue(V8x8Ty);
  const Constant* c64 = Constant::getNullValue(V8x64Ty);

  const Constant *v2ptr32 = Constant::getNullValue(V2Int32PtrTy);

  EXPECT_TRUE(CastInst::isCastable(V8x8Ty, X86MMXTy));
  EXPECT_TRUE(CastInst::isCastable(X86MMXTy, V8x8Ty));
  EXPECT_FALSE(CastInst::isCastable(Int64Ty, X86MMXTy));
  EXPECT_TRUE(CastInst::isCastable(V8x64Ty, V8x8Ty));
  EXPECT_TRUE(CastInst::isCastable(V8x8Ty, V8x64Ty));
  EXPECT_EQ(CastInst::Trunc, CastInst::getCastOpcode(c64, true, V8x8Ty, true));
  EXPECT_EQ(CastInst::SExt, CastInst::getCastOpcode(c8, true, V8x64Ty, true));

  EXPECT_FALSE(CastInst::isBitCastable(V8x8Ty, X86MMXTy));
  EXPECT_FALSE(CastInst::isBitCastable(X86MMXTy, V8x8Ty));
  EXPECT_FALSE(CastInst::isBitCastable(Int64Ty, X86MMXTy));
  EXPECT_FALSE(CastInst::isBitCastable(V8x64Ty, V8x8Ty));
  EXPECT_FALSE(CastInst::isBitCastable(V8x8Ty, V8x64Ty));

  // Check address space casts are rejected since we don't know the sizes here
  EXPECT_FALSE(CastInst::isBitCastable(Int32PtrTy, Int32PtrAS1Ty));
  EXPECT_FALSE(CastInst::isBitCastable(Int32PtrAS1Ty, Int32PtrTy));
  EXPECT_FALSE(CastInst::isBitCastable(V2Int32PtrTy, V2Int32PtrAS1Ty));
  EXPECT_FALSE(CastInst::isBitCastable(V2Int32PtrAS1Ty, V2Int32PtrTy));
  EXPECT_TRUE(CastInst::isBitCastable(V2Int32PtrAS1Ty, V2Int64PtrAS1Ty));
  EXPECT_TRUE(CastInst::isCastable(V2Int32PtrAS1Ty, V2Int32PtrTy));
  EXPECT_EQ(CastInst::AddrSpaceCast, CastInst::getCastOpcode(v2ptr32, true,
                                                             V2Int32PtrAS1Ty,
                                                             true));

  // Test mismatched number of elements for pointers
  EXPECT_FALSE(CastInst::isBitCastable(V2Int32PtrAS1Ty, V4Int64PtrAS1Ty));
  EXPECT_FALSE(CastInst::isBitCastable(V4Int64PtrAS1Ty, V2Int32PtrAS1Ty));
  EXPECT_FALSE(CastInst::isBitCastable(V2Int32PtrAS1Ty, V4Int32PtrAS1Ty));
  EXPECT_FALSE(CastInst::isBitCastable(Int32PtrTy, V2Int32PtrTy));
  EXPECT_FALSE(CastInst::isBitCastable(V2Int32PtrTy, Int32PtrTy));

  EXPECT_TRUE(CastInst::isBitCastable(Int32PtrTy, Int64PtrTy));
  EXPECT_FALSE(CastInst::isBitCastable(DoubleTy, FloatTy));
  EXPECT_FALSE(CastInst::isBitCastable(FloatTy, DoubleTy));
  EXPECT_TRUE(CastInst::isBitCastable(FloatTy, FloatTy));
  EXPECT_TRUE(CastInst::isBitCastable(FloatTy, FloatTy));
  EXPECT_TRUE(CastInst::isBitCastable(FloatTy, Int32Ty));
  EXPECT_TRUE(CastInst::isBitCastable(Int16Ty, HalfTy));
  EXPECT_TRUE(CastInst::isBitCastable(Int32Ty, FloatTy));
  EXPECT_TRUE(CastInst::isBitCastable(V2Int32Ty, Int64Ty));

  EXPECT_TRUE(CastInst::isBitCastable(V2Int32Ty, V4Int16Ty));
  EXPECT_FALSE(CastInst::isBitCastable(Int32Ty, Int64Ty));
  EXPECT_FALSE(CastInst::isBitCastable(Int64Ty, Int32Ty));

  EXPECT_FALSE(CastInst::isBitCastable(V2Int32PtrTy, Int64Ty));
  EXPECT_FALSE(CastInst::isBitCastable(Int64Ty, V2Int32PtrTy));
  EXPECT_TRUE(CastInst::isBitCastable(V2Int64PtrTy, V2Int32PtrTy));
  EXPECT_TRUE(CastInst::isBitCastable(V2Int32PtrTy, V2Int64PtrTy));
  EXPECT_FALSE(CastInst::isBitCastable(V2Int32Ty, V2Int64Ty));
  EXPECT_FALSE(CastInst::isBitCastable(V2Int64Ty, V2Int32Ty));


  EXPECT_FALSE(CastInst::castIsValid(Instruction::BitCast,
                                     Constant::getNullValue(V4Int32PtrTy),
                                     V2Int32PtrTy));
  EXPECT_FALSE(CastInst::castIsValid(Instruction::BitCast,
                                     Constant::getNullValue(V2Int32PtrTy),
                                     V4Int32PtrTy));

  EXPECT_FALSE(CastInst::castIsValid(Instruction::AddrSpaceCast,
                                     Constant::getNullValue(V4Int32PtrAS1Ty),
                                     V2Int32PtrTy));
  EXPECT_FALSE(CastInst::castIsValid(Instruction::AddrSpaceCast,
                                     Constant::getNullValue(V2Int32PtrTy),
                                     V4Int32PtrAS1Ty));


  // Check that assertion is not hit when creating a cast with a vector of
  // pointers
  // First form
  BasicBlock *BB = BasicBlock::Create(C);
  Constant *NullV2I32Ptr = Constant::getNullValue(V2Int32PtrTy);
  CastInst::CreatePointerCast(NullV2I32Ptr, V2Int32Ty, "foo", BB);

  // Second form
  CastInst::CreatePointerCast(NullV2I32Ptr, V2Int32Ty);
}

TEST(InstructionsTest, VectorGep) {
  LLVMContext &C(getGlobalContext());

  // Type Definitions
  PointerType *Ptri8Ty = PointerType::get(IntegerType::get(C, 8), 0);
  PointerType *Ptri32Ty = PointerType::get(IntegerType::get(C, 32), 0);

  VectorType *V2xi8PTy = VectorType::get(Ptri8Ty, 2);
  VectorType *V2xi32PTy = VectorType::get(Ptri32Ty, 2);

  // Test different aspects of the vector-of-pointers type
  // and GEPs which use this type.
  ConstantInt *Ci32a = ConstantInt::get(C, APInt(32, 1492));
  ConstantInt *Ci32b = ConstantInt::get(C, APInt(32, 1948));
  std::vector<Constant*> ConstVa(2, Ci32a);
  std::vector<Constant*> ConstVb(2, Ci32b);
  Constant *C2xi32a = ConstantVector::get(ConstVa);
  Constant *C2xi32b = ConstantVector::get(ConstVb);

  CastInst *PtrVecA = new IntToPtrInst(C2xi32a, V2xi32PTy);
  CastInst *PtrVecB = new IntToPtrInst(C2xi32b, V2xi32PTy);

  ICmpInst *ICmp0 = new ICmpInst(ICmpInst::ICMP_SGT, PtrVecA, PtrVecB);
  ICmpInst *ICmp1 = new ICmpInst(ICmpInst::ICMP_ULT, PtrVecA, PtrVecB);
  EXPECT_NE(ICmp0, ICmp1); // suppress warning.

  BasicBlock* BB0 = BasicBlock::Create(C);
  // Test InsertAtEnd ICmpInst constructor.
  ICmpInst *ICmp2 = new ICmpInst(*BB0, ICmpInst::ICMP_SGE, PtrVecA, PtrVecB);
  EXPECT_NE(ICmp0, ICmp2); // suppress warning.

  GetElementPtrInst *Gep0 = GetElementPtrInst::Create(PtrVecA, C2xi32a);
  GetElementPtrInst *Gep1 = GetElementPtrInst::Create(PtrVecA, C2xi32b);
  GetElementPtrInst *Gep2 = GetElementPtrInst::Create(PtrVecB, C2xi32a);
  GetElementPtrInst *Gep3 = GetElementPtrInst::Create(PtrVecB, C2xi32b);

  CastInst *BTC0 = new BitCastInst(Gep0, V2xi8PTy);
  CastInst *BTC1 = new BitCastInst(Gep1, V2xi8PTy);
  CastInst *BTC2 = new BitCastInst(Gep2, V2xi8PTy);
  CastInst *BTC3 = new BitCastInst(Gep3, V2xi8PTy);

  Value *S0 = BTC0->stripPointerCasts();
  Value *S1 = BTC1->stripPointerCasts();
  Value *S2 = BTC2->stripPointerCasts();
  Value *S3 = BTC3->stripPointerCasts();

  EXPECT_NE(S0, Gep0);
  EXPECT_NE(S1, Gep1);
  EXPECT_NE(S2, Gep2);
  EXPECT_NE(S3, Gep3);

  int64_t Offset;
  DataLayout TD("e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3"
                "2:32:32-f64:64:64-v64:64:64-v128:128:128-a:0:64-s:64:64-f80"
                ":128:128-n8:16:32:64-S128");
  // Make sure we don't crash
  GetPointerBaseWithConstantOffset(Gep0, Offset, &TD);
  GetPointerBaseWithConstantOffset(Gep1, Offset, &TD);
  GetPointerBaseWithConstantOffset(Gep2, Offset, &TD);
  GetPointerBaseWithConstantOffset(Gep3, Offset, &TD);

  // Gep of Geps
  GetElementPtrInst *GepII0 = GetElementPtrInst::Create(Gep0, C2xi32b);
  GetElementPtrInst *GepII1 = GetElementPtrInst::Create(Gep1, C2xi32a);
  GetElementPtrInst *GepII2 = GetElementPtrInst::Create(Gep2, C2xi32b);
  GetElementPtrInst *GepII3 = GetElementPtrInst::Create(Gep3, C2xi32a);

  EXPECT_EQ(GepII0->getNumIndices(), 1u);
  EXPECT_EQ(GepII1->getNumIndices(), 1u);
  EXPECT_EQ(GepII2->getNumIndices(), 1u);
  EXPECT_EQ(GepII3->getNumIndices(), 1u);

  EXPECT_FALSE(GepII0->hasAllZeroIndices());
  EXPECT_FALSE(GepII1->hasAllZeroIndices());
  EXPECT_FALSE(GepII2->hasAllZeroIndices());
  EXPECT_FALSE(GepII3->hasAllZeroIndices());

  delete GepII0;
  delete GepII1;
  delete GepII2;
  delete GepII3;

  delete BTC0;
  delete BTC1;
  delete BTC2;
  delete BTC3;

  delete Gep0;
  delete Gep1;
  delete Gep2;
  delete Gep3;

  ICmp2->eraseFromParent();
  delete BB0;

  delete ICmp0;
  delete ICmp1;
  delete PtrVecA;
  delete PtrVecB;
}

TEST(InstructionsTest, FPMathOperator) {
  LLVMContext &Context = getGlobalContext();
  IRBuilder<> Builder(Context);
  MDBuilder MDHelper(Context);
  Instruction *I = Builder.CreatePHI(Builder.getDoubleTy(), 0);
  MDNode *MD1 = MDHelper.createFPMath(1.0);
  Value *V1 = Builder.CreateFAdd(I, I, "", MD1);
  EXPECT_TRUE(isa<FPMathOperator>(V1));
  FPMathOperator *O1 = cast<FPMathOperator>(V1);
  EXPECT_EQ(O1->getFPAccuracy(), 1.0);
  delete V1;
  delete I;
}


TEST(InstructionsTest, isEliminableCastPair) {
  LLVMContext &C(getGlobalContext());

  Type* Int16Ty = Type::getInt16Ty(C);
  Type* Int32Ty = Type::getInt32Ty(C);
  Type* Int64Ty = Type::getInt64Ty(C);
  Type* Int64PtrTy = Type::getInt64PtrTy(C);

  // Source and destination pointers have same size -> bitcast.
  EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::PtrToInt,
                                           CastInst::IntToPtr,
                                           Int64PtrTy, Int64Ty, Int64PtrTy,
                                           Int32Ty, nullptr, Int32Ty),
            CastInst::BitCast);

  // Source and destination have unknown sizes, but the same address space and
  // the intermediate int is the maximum pointer size -> bitcast
  EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::PtrToInt,
                                           CastInst::IntToPtr,
                                           Int64PtrTy, Int64Ty, Int64PtrTy,
                                           nullptr, nullptr, nullptr),
            CastInst::BitCast);

  // Source and destination have unknown sizes, but the same address space and
  // the intermediate int is not the maximum pointer size -> nothing
  EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::PtrToInt,
                                           CastInst::IntToPtr,
                                           Int64PtrTy, Int32Ty, Int64PtrTy,
                                           nullptr, nullptr, nullptr),
            0U);

  // Middle pointer big enough -> bitcast.
  EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::IntToPtr,
                                           CastInst::PtrToInt,
                                           Int64Ty, Int64PtrTy, Int64Ty,
                                           nullptr, Int64Ty, nullptr),
            CastInst::BitCast);

  // Middle pointer too small -> fail.
  EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::IntToPtr,
                                           CastInst::PtrToInt,
                                           Int64Ty, Int64PtrTy, Int64Ty,
                                           nullptr, Int32Ty, nullptr),
            0U);

  // Test that we don't eliminate bitcasts between different address spaces,
  // or if we don't have available pointer size information.
  DataLayout DL("e-p:32:32:32-p1:16:16:16-p2:64:64:64-i1:8:8-i8:8:8-i16:16:16"
                "-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64"
                "-v128:128:128-a:0:64-s:64:64-f80:128:128-n8:16:32:64-S128");

  Type* Int64PtrTyAS1 = Type::getInt64PtrTy(C, 1);
  Type* Int64PtrTyAS2 = Type::getInt64PtrTy(C, 2);

  IntegerType *Int16SizePtr = DL.getIntPtrType(C, 1);
  IntegerType *Int64SizePtr = DL.getIntPtrType(C, 2);

  // Cannot simplify inttoptr, addrspacecast
  EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::IntToPtr,
                                           CastInst::AddrSpaceCast,
                                           Int16Ty, Int64PtrTyAS1, Int64PtrTyAS2,
                                           nullptr, Int16SizePtr, Int64SizePtr),
            0U);

  // Cannot simplify addrspacecast, ptrtoint
  EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::AddrSpaceCast,
                                           CastInst::PtrToInt,
                                           Int64PtrTyAS1, Int64PtrTyAS2, Int16Ty,
                                           Int64SizePtr, Int16SizePtr, nullptr),
            0U);

  // Pass since the bitcast address spaces are the same
  EXPECT_EQ(CastInst::isEliminableCastPair(CastInst::IntToPtr,
                                           CastInst::BitCast,
                                           Int16Ty, Int64PtrTyAS1, Int64PtrTyAS1,
                                           nullptr, nullptr, nullptr),
            CastInst::IntToPtr);

}

TEST(InstructionsTest, CloneCall) {
  LLVMContext &C(getGlobalContext());
  Type *Int32Ty = Type::getInt32Ty(C);
  Type *ArgTys[] = {Int32Ty, Int32Ty, Int32Ty};
  Type *FnTy = FunctionType::get(Int32Ty, ArgTys, /*isVarArg=*/false);
  Value *Callee = Constant::getNullValue(FnTy->getPointerTo());
  Value *Args[] = {
    ConstantInt::get(Int32Ty, 1),
    ConstantInt::get(Int32Ty, 2),
    ConstantInt::get(Int32Ty, 3)
  };
  std::unique_ptr<CallInst> Call(CallInst::Create(Callee, Args, "result"));

  // Test cloning the tail call kind.
  CallInst::TailCallKind Kinds[] = {CallInst::TCK_None, CallInst::TCK_Tail,
                                    CallInst::TCK_MustTail};
  for (CallInst::TailCallKind TCK : Kinds) {
    Call->setTailCallKind(TCK);
    std::unique_ptr<CallInst> Clone(cast<CallInst>(Call->clone()));
    EXPECT_EQ(Call->getTailCallKind(), Clone->getTailCallKind());
  }
  Call->setTailCallKind(CallInst::TCK_None);

  // Test cloning an attribute.
  {
    AttrBuilder AB;
    AB.addAttribute(Attribute::ReadOnly);
    Call->setAttributes(AttributeSet::get(C, AttributeSet::FunctionIndex, AB));
    std::unique_ptr<CallInst> Clone(cast<CallInst>(Call->clone()));
    EXPECT_TRUE(Clone->onlyReadsMemory());
  }
}

}  // end anonymous namespace
}  // end namespace llvm