forked from OSchip/llvm-project
334 lines
14 KiB
C++
334 lines
14 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/ScalarEvolutionExpander.h"
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#include "llvm/Analysis/ScalarEvolutionExpressions.h"
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#include "llvm/Analysis/AssumptionCache.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "gtest/gtest.h"
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namespace llvm {
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namespace {
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// We use this fixture to ensure that we clean up ScalarEvolution before
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// deleting the PassManager.
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class ScalarEvolutionsTest : public testing::Test {
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protected:
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LLVMContext Context;
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Module M;
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TargetLibraryInfoImpl TLII;
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TargetLibraryInfo TLI;
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std::unique_ptr<AssumptionCache> AC;
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std::unique_ptr<DominatorTree> DT;
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std::unique_ptr<LoopInfo> LI;
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ScalarEvolutionsTest() : M("", Context), TLII(), TLI(TLII) {}
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ScalarEvolution buildSE(Function &F) {
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AC.reset(new AssumptionCache(F));
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DT.reset(new DominatorTree(F));
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LI.reset(new LoopInfo(*DT));
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return ScalarEvolution(F, TLI, *AC, *DT, *LI);
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}
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};
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TEST_F(ScalarEvolutionsTest, SCEVUnknownRAUW) {
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FunctionType *FTy = FunctionType::get(Type::getVoidTy(Context),
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std::vector<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, nullptr, BB);
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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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ScalarEvolution SE = buildSE(*F);
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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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}
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TEST_F(ScalarEvolutionsTest, SCEVMultiplyAddRecs) {
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Type *Ty = Type::getInt32Ty(Context);
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SmallVector<Type *, 10> Types;
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Types.append(10, Ty);
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FunctionType *FTy = FunctionType::get(Type::getVoidTy(Context), Types, 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, nullptr, BB);
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ScalarEvolution SE = buildSE(*F);
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// It's possible to produce an empty loop through the default constructor,
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// but you can't add any blocks to it without a LoopInfo pass.
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Loop L;
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const_cast<std::vector<BasicBlock*>&>(L.getBlocks()).push_back(BB);
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Function::arg_iterator AI = F->arg_begin();
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SmallVector<const SCEV *, 5> A;
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A.push_back(SE.getSCEV(&*AI++));
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A.push_back(SE.getSCEV(&*AI++));
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A.push_back(SE.getSCEV(&*AI++));
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A.push_back(SE.getSCEV(&*AI++));
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A.push_back(SE.getSCEV(&*AI++));
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const SCEV *A_rec = SE.getAddRecExpr(A, &L, SCEV::FlagAnyWrap);
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SmallVector<const SCEV *, 5> B;
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B.push_back(SE.getSCEV(&*AI++));
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B.push_back(SE.getSCEV(&*AI++));
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B.push_back(SE.getSCEV(&*AI++));
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B.push_back(SE.getSCEV(&*AI++));
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B.push_back(SE.getSCEV(&*AI++));
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const SCEV *B_rec = SE.getAddRecExpr(B, &L, SCEV::FlagAnyWrap);
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/* Spot check that we perform this transformation:
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{A0,+,A1,+,A2,+,A3,+,A4} * {B0,+,B1,+,B2,+,B3,+,B4} =
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{A0*B0,+,
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A1*B0 + A0*B1 + A1*B1,+,
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A2*B0 + 2A1*B1 + A0*B2 + 2A2*B1 + 2A1*B2 + A2*B2,+,
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A3*B0 + 3A2*B1 + 3A1*B2 + A0*B3 + 3A3*B1 + 6A2*B2 + 3A1*B3 + 3A3*B2 +
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3A2*B3 + A3*B3,+,
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A4*B0 + 4A3*B1 + 6A2*B2 + 4A1*B3 + A0*B4 + 4A4*B1 + 12A3*B2 + 12A2*B3 +
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4A1*B4 + 6A4*B2 + 12A3*B3 + 6A2*B4 + 4A4*B3 + 4A3*B4 + A4*B4,+,
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5A4*B1 + 10A3*B2 + 10A2*B3 + 5A1*B4 + 20A4*B2 + 30A3*B3 + 20A2*B4 +
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30A4*B3 + 30A3*B4 + 20A4*B4,+,
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15A4*B2 + 20A3*B3 + 15A2*B4 + 60A4*B3 + 60A3*B4 + 90A4*B4,+,
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35A4*B3 + 35A3*B4 + 140A4*B4,+,
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70A4*B4}
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*/
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const SCEVAddRecExpr *Product =
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dyn_cast<SCEVAddRecExpr>(SE.getMulExpr(A_rec, B_rec));
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ASSERT_TRUE(Product);
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ASSERT_EQ(Product->getNumOperands(), 9u);
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SmallVector<const SCEV *, 16> Sum;
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Sum.push_back(SE.getMulExpr(A[0], B[0]));
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EXPECT_EQ(Product->getOperand(0), SE.getAddExpr(Sum));
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Sum.clear();
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// SCEV produces different an equal but different expression for these.
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// Re-enable when PR11052 is fixed.
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#if 0
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Sum.push_back(SE.getMulExpr(A[1], B[0]));
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Sum.push_back(SE.getMulExpr(A[0], B[1]));
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Sum.push_back(SE.getMulExpr(A[1], B[1]));
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EXPECT_EQ(Product->getOperand(1), SE.getAddExpr(Sum));
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Sum.clear();
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Sum.push_back(SE.getMulExpr(A[2], B[0]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 2), A[1], B[1]));
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Sum.push_back(SE.getMulExpr(A[0], B[2]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 2), A[2], B[1]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 2), A[1], B[2]));
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Sum.push_back(SE.getMulExpr(A[2], B[2]));
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EXPECT_EQ(Product->getOperand(2), SE.getAddExpr(Sum));
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Sum.clear();
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Sum.push_back(SE.getMulExpr(A[3], B[0]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 3), A[2], B[1]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 3), A[1], B[2]));
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Sum.push_back(SE.getMulExpr(A[0], B[3]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 3), A[3], B[1]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 6), A[2], B[2]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 3), A[1], B[3]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 3), A[3], B[2]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 3), A[2], B[3]));
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Sum.push_back(SE.getMulExpr(A[3], B[3]));
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EXPECT_EQ(Product->getOperand(3), SE.getAddExpr(Sum));
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Sum.clear();
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Sum.push_back(SE.getMulExpr(A[4], B[0]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 4), A[3], B[1]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 6), A[2], B[2]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 4), A[1], B[3]));
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Sum.push_back(SE.getMulExpr(A[0], B[4]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 4), A[4], B[1]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 12), A[3], B[2]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 12), A[2], B[3]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 4), A[1], B[4]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 6), A[4], B[2]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 12), A[3], B[3]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 6), A[2], B[4]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 4), A[4], B[3]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 4), A[3], B[4]));
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Sum.push_back(SE.getMulExpr(A[4], B[4]));
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EXPECT_EQ(Product->getOperand(4), SE.getAddExpr(Sum));
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Sum.clear();
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 5), A[4], B[1]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 10), A[3], B[2]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 10), A[2], B[3]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 5), A[1], B[4]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 20), A[4], B[2]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 30), A[3], B[3]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 20), A[2], B[4]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 30), A[4], B[3]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 30), A[3], B[4]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 20), A[4], B[4]));
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EXPECT_EQ(Product->getOperand(5), SE.getAddExpr(Sum));
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Sum.clear();
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 15), A[4], B[2]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 20), A[3], B[3]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 15), A[2], B[4]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 60), A[4], B[3]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 60), A[3], B[4]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 90), A[4], B[4]));
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EXPECT_EQ(Product->getOperand(6), SE.getAddExpr(Sum));
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Sum.clear();
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 35), A[4], B[3]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 35), A[3], B[4]));
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 140), A[4], B[4]));
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EXPECT_EQ(Product->getOperand(7), SE.getAddExpr(Sum));
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Sum.clear();
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#endif
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Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 70), A[4], B[4]));
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EXPECT_EQ(Product->getOperand(8), SE.getAddExpr(Sum));
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}
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TEST_F(ScalarEvolutionsTest, SimplifiedPHI) {
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FunctionType *FTy = FunctionType::get(Type::getVoidTy(Context),
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std::vector<Type *>(), false);
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Function *F = cast<Function>(M.getOrInsertFunction("f", FTy));
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BasicBlock *EntryBB = BasicBlock::Create(Context, "entry", F);
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BasicBlock *LoopBB = BasicBlock::Create(Context, "loop", F);
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BasicBlock *ExitBB = BasicBlock::Create(Context, "exit", F);
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BranchInst::Create(LoopBB, EntryBB);
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BranchInst::Create(LoopBB, ExitBB, UndefValue::get(Type::getInt1Ty(Context)),
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LoopBB);
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ReturnInst::Create(Context, nullptr, ExitBB);
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auto *Ty = Type::getInt32Ty(Context);
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auto *PN = PHINode::Create(Ty, 2, "", &*LoopBB->begin());
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PN->addIncoming(Constant::getNullValue(Ty), EntryBB);
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PN->addIncoming(UndefValue::get(Ty), LoopBB);
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ScalarEvolution SE = buildSE(*F);
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auto *S1 = SE.getSCEV(PN);
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auto *S2 = SE.getSCEV(PN);
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auto *ZeroConst = SE.getConstant(Ty, 0);
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// At some point, only the first call to getSCEV returned the simplified
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// SCEVConstant and later calls just returned a SCEVUnknown referencing the
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// PHI node.
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EXPECT_EQ(S1, ZeroConst);
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EXPECT_EQ(S1, S2);
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}
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TEST_F(ScalarEvolutionsTest, ExpandPtrTypeSCEV) {
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// It is to test the fix for PR30213. It exercises the branch in scev
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// expansion when the value in ValueOffsetPair is a ptr and the offset
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// is not divisible by the elem type size of value.
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auto *I8Ty = Type::getInt8Ty(Context);
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auto *I8PtrTy = Type::getInt8PtrTy(Context);
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auto *I32Ty = Type::getInt32Ty(Context);
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auto *I32PtrTy = Type::getInt32PtrTy(Context);
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FunctionType *FTy =
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FunctionType::get(Type::getVoidTy(Context), std::vector<Type *>(), false);
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Function *F = cast<Function>(M.getOrInsertFunction("f", FTy));
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BasicBlock *EntryBB = BasicBlock::Create(Context, "entry", F);
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BasicBlock *LoopBB = BasicBlock::Create(Context, "loop", F);
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BasicBlock *ExitBB = BasicBlock::Create(Context, "exit", F);
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BranchInst::Create(LoopBB, EntryBB);
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ReturnInst::Create(Context, nullptr, ExitBB);
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// loop: ; preds = %loop, %entry
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// %alloca = alloca i32
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// %gep0 = getelementptr i32, i32* %alloca, i32 1
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// %bitcast1 = bitcast i32* %gep0 to i8*
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// %gep1 = getelementptr i8, i8* %bitcast1, i32 1
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// %gep2 = getelementptr i8, i8* undef, i32 1
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// %cmp = icmp ult i8* undef, %bitcast1
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// %select = select i1 %cmp, i8* %gep1, i8* %gep2
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// %bitcast2 = bitcast i8* %select to i32*
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// br i1 undef, label %loop, label %exit
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BranchInst *Br = BranchInst::Create(
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LoopBB, ExitBB, UndefValue::get(Type::getInt1Ty(Context)), LoopBB);
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AllocaInst *Alloca = new AllocaInst(I32Ty, "alloca", Br);
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ConstantInt *Ci32 = ConstantInt::get(Context, APInt(32, 1));
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GetElementPtrInst *Gep0 =
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GetElementPtrInst::Create(I32Ty, Alloca, Ci32, "gep0", Br);
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CastInst *CastA =
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CastInst::CreateBitOrPointerCast(Gep0, I8PtrTy, "bitcast1", Br);
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GetElementPtrInst *Gep1 =
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GetElementPtrInst::Create(I8Ty, CastA, Ci32, "gep1", Br);
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GetElementPtrInst *Gep2 = GetElementPtrInst::Create(
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I8Ty, UndefValue::get(I8PtrTy), Ci32, "gep2", Br);
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CmpInst *Cmp = CmpInst::Create(Instruction::ICmp, CmpInst::ICMP_ULT,
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UndefValue::get(I8PtrTy), CastA, "cmp", Br);
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SelectInst *Sel = SelectInst::Create(Cmp, Gep1, Gep2, "select", Br);
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CastInst *CastB =
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CastInst::CreateBitOrPointerCast(Sel, I32PtrTy, "bitcast2", Br);
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ScalarEvolution SE = buildSE(*F);
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auto *S = SE.getSCEV(CastB);
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SCEVExpander Exp(SE, M.getDataLayout(), "expander");
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Value *V =
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Exp.expandCodeFor(cast<SCEVAddExpr>(S)->getOperand(1), nullptr, Br);
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// Expect the expansion code contains:
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// %0 = bitcast i32* %bitcast2 to i8*
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// %uglygep = getelementptr i8, i8* %0, i64 -1
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// %1 = bitcast i8* %uglygep to i32*
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EXPECT_TRUE(isa<BitCastInst>(V));
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Instruction *Gep = cast<Instruction>(V)->getPrevNode();
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EXPECT_TRUE(isa<GetElementPtrInst>(Gep));
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EXPECT_TRUE(isa<ConstantInt>(Gep->getOperand(1)));
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EXPECT_EQ(cast<ConstantInt>(Gep->getOperand(1))->getSExtValue(), -1);
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EXPECT_TRUE(isa<BitCastInst>(Gep->getPrevNode()));
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}
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} // end anonymous namespace
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} // end namespace llvm
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