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of Value deletions and RAUWs, instead of relying on ScalarEvolution's Scalars map being notified, as that's complicated at best, and insufficient in general. This means SCEVUnknown needs a non-trivial destructor, so introduce a mechanism to allow ScalarEvolution to locate all the SCEVUnknowns. llvm-svn: 110086
83 lines
2.9 KiB
C++
83 lines
2.9 KiB
C++
//===- ScalarEvolutionsTest.cpp - ScalarEvolution unit tests --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include <llvm/Analysis/ScalarEvolutionExpressions.h>
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#include <llvm/GlobalVariable.h>
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#include <llvm/Constants.h>
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#include <llvm/LLVMContext.h>
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#include <llvm/Module.h>
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#include <llvm/PassManager.h>
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#include "gtest/gtest.h"
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namespace llvm {
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namespace {
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TEST(ScalarEvolutionsTest, SCEVUnknownRAUW) {
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LLVMContext Context;
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Module M("world", Context);
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const FunctionType *FTy = FunctionType::get(Type::getVoidTy(Context),
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std::vector<const Type *>(), false);
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Function *F = cast<Function>(M.getOrInsertFunction("f", FTy));
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BasicBlock *BB = BasicBlock::Create(Context, "entry", F);
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ReturnInst::Create(Context, 0, BB);
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const Type *Ty = Type::getInt1Ty(Context);
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Constant *Init = Constant::getNullValue(Ty);
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Value *V0 = new GlobalVariable(M, Ty, false, GlobalValue::ExternalLinkage, Init, "V0");
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Value *V1 = new GlobalVariable(M, Ty, false, GlobalValue::ExternalLinkage, Init, "V1");
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Value *V2 = new GlobalVariable(M, Ty, false, GlobalValue::ExternalLinkage, Init, "V2");
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// Create a ScalarEvolution and "run" it so that it gets initialized.
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PassManager PM;
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ScalarEvolution &SE = *new ScalarEvolution();
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PM.add(&SE);
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PM.run(M);
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const SCEV *S0 = SE.getSCEV(V0);
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const SCEV *S1 = SE.getSCEV(V1);
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const SCEV *S2 = SE.getSCEV(V2);
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const SCEV *P0 = SE.getAddExpr(S0, S0);
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const SCEV *P1 = SE.getAddExpr(S1, S1);
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const SCEV *P2 = SE.getAddExpr(S2, S2);
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const SCEVMulExpr *M0 = cast<SCEVMulExpr>(P0);
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const SCEVMulExpr *M1 = cast<SCEVMulExpr>(P1);
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const SCEVMulExpr *M2 = cast<SCEVMulExpr>(P2);
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EXPECT_EQ(cast<SCEVConstant>(M0->getOperand(0))->getValue()->getZExtValue(),
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2u);
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EXPECT_EQ(cast<SCEVConstant>(M1->getOperand(0))->getValue()->getZExtValue(),
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2u);
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EXPECT_EQ(cast<SCEVConstant>(M2->getOperand(0))->getValue()->getZExtValue(),
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2u);
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// Before the RAUWs, these are all pointing to separate values.
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EXPECT_EQ(cast<SCEVUnknown>(M0->getOperand(1))->getValue(), V0);
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EXPECT_EQ(cast<SCEVUnknown>(M1->getOperand(1))->getValue(), V1);
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EXPECT_EQ(cast<SCEVUnknown>(M2->getOperand(1))->getValue(), V2);
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// Do some RAUWs.
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V2->replaceAllUsesWith(V1);
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V1->replaceAllUsesWith(V0);
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// After the RAUWs, these should all be pointing to V0.
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EXPECT_EQ(cast<SCEVUnknown>(M0->getOperand(1))->getValue(), V0);
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EXPECT_EQ(cast<SCEVUnknown>(M1->getOperand(1))->getValue(), V0);
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EXPECT_EQ(cast<SCEVUnknown>(M2->getOperand(1))->getValue(), V0);
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// Manually clean up, since we allocated new SCEV objects after the
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// pass was finished.
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SE.releaseMemory();
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}
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} // end anonymous namespace
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} // end namespace llvm
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