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llvm/unittests/Analysis/ScalarEvolutionTest.cpp
Nick Lewycky e97728ecf8 The product of two chrec's can always be represented as a chrec. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141066 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-04 06:51:26 +00:00

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//===- ScalarEvolutionsTest.cpp - ScalarEvolution 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/Analysis/ScalarEvolutionExpressions.h>
#include <llvm/Analysis/LoopInfo.h>
#include <llvm/GlobalVariable.h>
#include <llvm/Constants.h>
#include <llvm/LLVMContext.h>
#include <llvm/Module.h>
#include <llvm/PassManager.h>
#include <llvm/ADT/SmallVector.h>
#include "gtest/gtest.h"
namespace llvm {
namespace {
// We use this fixture to ensure that we clean up ScalarEvolution before
// deleting the PassManager.
class ScalarEvolutionsTest : public testing::Test {
protected:
ScalarEvolutionsTest() : M("", Context), SE(*new ScalarEvolution) {}
~ScalarEvolutionsTest() {
// Manually clean up, since we allocated new SCEV objects after the
// pass was finished.
SE.releaseMemory();
}
LLVMContext Context;
Module M;
PassManager PM;
ScalarEvolution &SE;
};
TEST_F(ScalarEvolutionsTest, SCEVUnknownRAUW) {
FunctionType *FTy = FunctionType::get(Type::getVoidTy(Context),
std::vector<Type *>(), false);
Function *F = cast<Function>(M.getOrInsertFunction("f", FTy));
BasicBlock *BB = BasicBlock::Create(Context, "entry", F);
ReturnInst::Create(Context, 0, BB);
Type *Ty = Type::getInt1Ty(Context);
Constant *Init = Constant::getNullValue(Ty);
Value *V0 = new GlobalVariable(M, Ty, false, GlobalValue::ExternalLinkage, Init, "V0");
Value *V1 = new GlobalVariable(M, Ty, false, GlobalValue::ExternalLinkage, Init, "V1");
Value *V2 = new GlobalVariable(M, Ty, false, GlobalValue::ExternalLinkage, Init, "V2");
// Create a ScalarEvolution and "run" it so that it gets initialized.
PM.add(&SE);
PM.run(M);
const SCEV *S0 = SE.getSCEV(V0);
const SCEV *S1 = SE.getSCEV(V1);
const SCEV *S2 = SE.getSCEV(V2);
const SCEV *P0 = SE.getAddExpr(S0, S0);
const SCEV *P1 = SE.getAddExpr(S1, S1);
const SCEV *P2 = SE.getAddExpr(S2, S2);
const SCEVMulExpr *M0 = cast<SCEVMulExpr>(P0);
const SCEVMulExpr *M1 = cast<SCEVMulExpr>(P1);
const SCEVMulExpr *M2 = cast<SCEVMulExpr>(P2);
EXPECT_EQ(cast<SCEVConstant>(M0->getOperand(0))->getValue()->getZExtValue(),
2u);
EXPECT_EQ(cast<SCEVConstant>(M1->getOperand(0))->getValue()->getZExtValue(),
2u);
EXPECT_EQ(cast<SCEVConstant>(M2->getOperand(0))->getValue()->getZExtValue(),
2u);
// Before the RAUWs, these are all pointing to separate values.
EXPECT_EQ(cast<SCEVUnknown>(M0->getOperand(1))->getValue(), V0);
EXPECT_EQ(cast<SCEVUnknown>(M1->getOperand(1))->getValue(), V1);
EXPECT_EQ(cast<SCEVUnknown>(M2->getOperand(1))->getValue(), V2);
// Do some RAUWs.
V2->replaceAllUsesWith(V1);
V1->replaceAllUsesWith(V0);
// After the RAUWs, these should all be pointing to V0.
EXPECT_EQ(cast<SCEVUnknown>(M0->getOperand(1))->getValue(), V0);
EXPECT_EQ(cast<SCEVUnknown>(M1->getOperand(1))->getValue(), V0);
EXPECT_EQ(cast<SCEVUnknown>(M2->getOperand(1))->getValue(), V0);
}
TEST_F(ScalarEvolutionsTest, SCEVMultiplyAddRecs) {
Type *Ty = Type::getInt32Ty(Context);
SmallVector<Type *, 10> Types;
Types.append(10, Ty);
FunctionType *FTy = FunctionType::get(Type::getVoidTy(Context), Types, false);
Function *F = cast<Function>(M.getOrInsertFunction("f", FTy));
BasicBlock *BB = BasicBlock::Create(Context, "entry", F);
ReturnInst::Create(Context, 0, BB);
// Create a ScalarEvolution and "run" it so that it gets initialized.
PM.add(&SE);
PM.run(M);
// It's possible to produce an empty loop through the default constructor,
// but you can't add any blocks to it without a LoopInfo pass.
Loop L;
const_cast<std::vector<BasicBlock*>&>(L.getBlocks()).push_back(BB);
Function::arg_iterator AI = F->arg_begin();
SmallVector<const SCEV *, 5> A;
A.push_back(SE.getSCEV(&*AI++));
A.push_back(SE.getSCEV(&*AI++));
A.push_back(SE.getSCEV(&*AI++));
A.push_back(SE.getSCEV(&*AI++));
A.push_back(SE.getSCEV(&*AI++));
const SCEV *A_rec = SE.getAddRecExpr(A, &L, SCEV::FlagAnyWrap);
SmallVector<const SCEV *, 5> B;
B.push_back(SE.getSCEV(&*AI++));
B.push_back(SE.getSCEV(&*AI++));
B.push_back(SE.getSCEV(&*AI++));
B.push_back(SE.getSCEV(&*AI++));
B.push_back(SE.getSCEV(&*AI++));
const SCEV *B_rec = SE.getAddRecExpr(B, &L, SCEV::FlagAnyWrap);
/* Spot check that we perform this transformation:
{A0,+,A1,+,A2,+,A3,+,A4} * {B0,+,B1,+,B2,+,B3,+,B4} =
{A0*B0,+,
A1*B0 + A0*B1 + A1*B1,+,
A2*B0 + 2A1*B1 + A0*B2 + 2A2*B1 + 2A1*B2 + A2*B2,+,
A3*B0 + 3A2*B1 + 3A1*B2 + A0*B3 + 3A3*B1 + 6A2*B2 + 3A1*B3 + 3A3*B2 +
3A2*B3 + A3*B3,+,
A4*B0 + 4A3*B1 + 6A2*B2 + 4A1*B3 + A0*B4 + 4A4*B1 + 12A3*B2 + 12A2*B3 +
4A1*B4 + 6A4*B2 + 12A3*B3 + 6A2*B4 + 4A4*B3 + 4A3*B4 + A4*B4,+,
5A4*B1 + 10A3*B2 + 10A2*B3 + 5A1*B4 + 20A4*B2 + 30A3*B3 + 20A2*B4 +
30A4*B3 + 30A3*B4 + 20A4*B4,+,
15A4*B2 + 20A3*B3 + 15A2*B4 + 60A4*B3 + 60A3*B4 + 90A4*B4,+,
35A4*B3 + 35A3*B4 + 140A4*B4,+,
70A4*B4}
*/
const SCEVAddRecExpr *Product =
dyn_cast<SCEVAddRecExpr>(SE.getMulExpr(A_rec, B_rec));
ASSERT_TRUE(Product);
ASSERT_EQ(Product->getNumOperands(), 9u);
SmallVector<const SCEV *, 16> Sum;
Sum.push_back(SE.getMulExpr(A[0], B[0]));
EXPECT_EQ(Product->getOperand(0), SE.getAddExpr(Sum));
Sum.clear();
// SCEV produces different an equal but different expression for these.
// Re-enable when PR11052 is fixed.
#if 0
Sum.push_back(SE.getMulExpr(A[1], B[0]));
Sum.push_back(SE.getMulExpr(A[0], B[1]));
Sum.push_back(SE.getMulExpr(A[1], B[1]));
EXPECT_EQ(Product->getOperand(1), SE.getAddExpr(Sum));
Sum.clear();
Sum.push_back(SE.getMulExpr(A[2], B[0]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 2), A[1], B[1]));
Sum.push_back(SE.getMulExpr(A[0], B[2]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 2), A[2], B[1]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 2), A[1], B[2]));
Sum.push_back(SE.getMulExpr(A[2], B[2]));
EXPECT_EQ(Product->getOperand(2), SE.getAddExpr(Sum));
Sum.clear();
Sum.push_back(SE.getMulExpr(A[3], B[0]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 3), A[2], B[1]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 3), A[1], B[2]));
Sum.push_back(SE.getMulExpr(A[0], B[3]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 3), A[3], B[1]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 6), A[2], B[2]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 3), A[1], B[3]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 3), A[3], B[2]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 3), A[2], B[3]));
Sum.push_back(SE.getMulExpr(A[3], B[3]));
EXPECT_EQ(Product->getOperand(3), SE.getAddExpr(Sum));
Sum.clear();
Sum.push_back(SE.getMulExpr(A[4], B[0]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 4), A[3], B[1]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 6), A[2], B[2]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 4), A[1], B[3]));
Sum.push_back(SE.getMulExpr(A[0], B[4]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 4), A[4], B[1]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 12), A[3], B[2]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 12), A[2], B[3]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 4), A[1], B[4]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 6), A[4], B[2]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 12), A[3], B[3]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 6), A[2], B[4]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 4), A[4], B[3]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 4), A[3], B[4]));
Sum.push_back(SE.getMulExpr(A[4], B[4]));
EXPECT_EQ(Product->getOperand(4), SE.getAddExpr(Sum));
Sum.clear();
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 5), A[4], B[1]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 10), A[3], B[2]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 10), A[2], B[3]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 5), A[1], B[4]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 20), A[4], B[2]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 30), A[3], B[3]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 20), A[2], B[4]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 30), A[4], B[3]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 30), A[3], B[4]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 20), A[4], B[4]));
EXPECT_EQ(Product->getOperand(5), SE.getAddExpr(Sum));
Sum.clear();
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 15), A[4], B[2]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 20), A[3], B[3]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 15), A[2], B[4]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 60), A[4], B[3]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 60), A[3], B[4]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 90), A[4], B[4]));
EXPECT_EQ(Product->getOperand(6), SE.getAddExpr(Sum));
Sum.clear();
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 35), A[4], B[3]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 35), A[3], B[4]));
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 140), A[4], B[4]));
EXPECT_EQ(Product->getOperand(7), SE.getAddExpr(Sum));
Sum.clear();
#endif
Sum.push_back(SE.getMulExpr(SE.getConstant(Ty, 70), A[4], B[4]));
EXPECT_EQ(Product->getOperand(8), SE.getAddExpr(Sum));
}
} // end anonymous namespace
} // end namespace llvm
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