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-rw-r--r--llvm/unittests/Analysis/ScalarEvolutionTest.cpp838
1 files changed, 1 insertions, 837 deletions
diff --git a/llvm/unittests/Analysis/ScalarEvolutionTest.cpp b/llvm/unittests/Analysis/ScalarEvolutionTest.cpp
index c42ebf656dd..b30eb014636 100644
--- a/llvm/unittests/Analysis/ScalarEvolutionTest.cpp
+++ b/llvm/unittests/Analysis/ScalarEvolutionTest.cpp
@@ -9,8 +9,8 @@
#include "llvm/ADT/SmallVector.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/LoopInfo.h"
-#include "llvm/Analysis/ScalarEvolutionExpander.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
+#include "llvm/Analysis/ScalarEvolutionNormalization.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/Constants.h"
@@ -141,72 +141,6 @@ TEST_F(ScalarEvolutionsTest, SimplifiedPHI) {
EXPECT_EQ(S1, S2);
}
-TEST_F(ScalarEvolutionsTest, ExpandPtrTypeSCEV) {
- // It is to test the fix for PR30213. It exercises the branch in scev
- // expansion when the value in ValueOffsetPair is a ptr and the offset
- // is not divisible by the elem type size of value.
- auto *I8Ty = Type::getInt8Ty(Context);
- auto *I8PtrTy = Type::getInt8PtrTy(Context);
- auto *I32Ty = Type::getInt32Ty(Context);
- auto *I32PtrTy = Type::getInt32PtrTy(Context);
- FunctionType *FTy =
- FunctionType::get(Type::getVoidTy(Context), std::vector<Type *>(), false);
- Function *F = Function::Create(FTy, Function::ExternalLinkage, "f", M);
- BasicBlock *EntryBB = BasicBlock::Create(Context, "entry", F);
- BasicBlock *LoopBB = BasicBlock::Create(Context, "loop", F);
- BasicBlock *ExitBB = BasicBlock::Create(Context, "exit", F);
- BranchInst::Create(LoopBB, EntryBB);
- ReturnInst::Create(Context, nullptr, ExitBB);
-
- // loop: ; preds = %loop, %entry
- // %alloca = alloca i32
- // %gep0 = getelementptr i32, i32* %alloca, i32 1
- // %bitcast1 = bitcast i32* %gep0 to i8*
- // %gep1 = getelementptr i8, i8* %bitcast1, i32 1
- // %gep2 = getelementptr i8, i8* undef, i32 1
- // %cmp = icmp ult i8* undef, %bitcast1
- // %select = select i1 %cmp, i8* %gep1, i8* %gep2
- // %bitcast2 = bitcast i8* %select to i32*
- // br i1 undef, label %loop, label %exit
-
- const DataLayout &DL = F->getParent()->getDataLayout();
- BranchInst *Br = BranchInst::Create(
- LoopBB, ExitBB, UndefValue::get(Type::getInt1Ty(Context)), LoopBB);
- AllocaInst *Alloca = new AllocaInst(I32Ty, DL.getAllocaAddrSpace(),
- "alloca", Br);
- ConstantInt *Ci32 = ConstantInt::get(Context, APInt(32, 1));
- GetElementPtrInst *Gep0 =
- GetElementPtrInst::Create(I32Ty, Alloca, Ci32, "gep0", Br);
- CastInst *CastA =
- CastInst::CreateBitOrPointerCast(Gep0, I8PtrTy, "bitcast1", Br);
- GetElementPtrInst *Gep1 =
- GetElementPtrInst::Create(I8Ty, CastA, Ci32, "gep1", Br);
- GetElementPtrInst *Gep2 = GetElementPtrInst::Create(
- I8Ty, UndefValue::get(I8PtrTy), Ci32, "gep2", Br);
- CmpInst *Cmp = CmpInst::Create(Instruction::ICmp, CmpInst::ICMP_ULT,
- UndefValue::get(I8PtrTy), CastA, "cmp", Br);
- SelectInst *Sel = SelectInst::Create(Cmp, Gep1, Gep2, "select", Br);
- CastInst *CastB =
- CastInst::CreateBitOrPointerCast(Sel, I32PtrTy, "bitcast2", Br);
-
- ScalarEvolution SE = buildSE(*F);
- auto *S = SE.getSCEV(CastB);
- SCEVExpander Exp(SE, M.getDataLayout(), "expander");
- Value *V =
- Exp.expandCodeFor(cast<SCEVAddExpr>(S)->getOperand(1), nullptr, Br);
-
- // Expect the expansion code contains:
- // %0 = bitcast i32* %bitcast2 to i8*
- // %uglygep = getelementptr i8, i8* %0, i64 -1
- // %1 = bitcast i8* %uglygep to i32*
- EXPECT_TRUE(isa<BitCastInst>(V));
- Instruction *Gep = cast<Instruction>(V)->getPrevNode();
- EXPECT_TRUE(isa<GetElementPtrInst>(Gep));
- EXPECT_TRUE(isa<ConstantInt>(Gep->getOperand(1)));
- EXPECT_EQ(cast<ConstantInt>(Gep->getOperand(1))->getSExtValue(), -1);
- EXPECT_TRUE(isa<BitCastInst>(Gep->getPrevNode()));
-}
-
static Instruction *getInstructionByName(Function &F, StringRef Name) {
for (auto &I : instructions(F))
if (I.getName() == Name)
@@ -719,83 +653,6 @@ TEST_F(ScalarEvolutionsTest, SCEVZeroExtendExpr) {
SE.getZeroExtendExpr(S, I128Ty);
}
-// Make sure that SCEV doesn't introduce illegal ptrtoint/inttoptr instructions
-TEST_F(ScalarEvolutionsTest, SCEVZeroExtendExprNonIntegral) {
- /*
- * Create the following code:
- * func(i64 addrspace(10)* %arg)
- * top:
- * br label %L.ph
- * L.ph:
- * br label %L
- * L:
- * %phi = phi i64 [i64 0, %L.ph], [ %add, %L2 ]
- * %add = add i64 %phi2, 1
- * br i1 undef, label %post, label %L2
- * post:
- * %gepbase = getelementptr i64 addrspace(10)* %arg, i64 1
- * #= %gep = getelementptr i64 addrspace(10)* %gepbase, i64 %add =#
- * ret void
- *
- * We will create the appropriate SCEV expression for %gep and expand it,
- * then check that no inttoptr/ptrtoint instructions got inserted.
- */
-
- // Create a module with non-integral pointers in it's datalayout
- Module NIM("nonintegral", Context);
- std::string DataLayout = M.getDataLayoutStr();
- if (!DataLayout.empty())
- DataLayout += "-";
- DataLayout += "ni:10";
- NIM.setDataLayout(DataLayout);
-
- Type *T_int1 = Type::getInt1Ty(Context);
- Type *T_int64 = Type::getInt64Ty(Context);
- Type *T_pint64 = T_int64->getPointerTo(10);
-
- FunctionType *FTy =
- FunctionType::get(Type::getVoidTy(Context), {T_pint64}, false);
- Function *F = Function::Create(FTy, Function::ExternalLinkage, "foo", NIM);
-
- Argument *Arg = &*F->arg_begin();
-
- BasicBlock *Top = BasicBlock::Create(Context, "top", F);
- BasicBlock *LPh = BasicBlock::Create(Context, "L.ph", F);
- BasicBlock *L = BasicBlock::Create(Context, "L", F);
- BasicBlock *Post = BasicBlock::Create(Context, "post", F);
-
- IRBuilder<> Builder(Top);
- Builder.CreateBr(LPh);
-
- Builder.SetInsertPoint(LPh);
- Builder.CreateBr(L);
-
- Builder.SetInsertPoint(L);
- PHINode *Phi = Builder.CreatePHI(T_int64, 2);
- Value *Add = Builder.CreateAdd(Phi, ConstantInt::get(T_int64, 1), "add");
- Builder.CreateCondBr(UndefValue::get(T_int1), L, Post);
- Phi->addIncoming(ConstantInt::get(T_int64, 0), LPh);
- Phi->addIncoming(Add, L);
-
- Builder.SetInsertPoint(Post);
- Value *GepBase =
- Builder.CreateGEP(T_int64, Arg, ConstantInt::get(T_int64, 1));
- Instruction *Ret = Builder.CreateRetVoid();
-
- ScalarEvolution SE = buildSE(*F);
- auto *AddRec =
- SE.getAddRecExpr(SE.getUnknown(GepBase), SE.getConstant(T_int64, 1),
- LI->getLoopFor(L), SCEV::FlagNUW);
-
- SCEVExpander Exp(SE, NIM.getDataLayout(), "expander");
- Exp.disableCanonicalMode();
- Exp.expandCodeFor(AddRec, T_pint64, Ret);
-
- // Make sure none of the instructions inserted were inttoptr/ptrtoint.
- // The verifier will check this.
- EXPECT_FALSE(verifyFunction(*F, &errs()));
-}
-
// Make sure that SCEV invalidates exit limits after invalidating the values it
// depends on when we forget a loop.
TEST_F(ScalarEvolutionsTest, SCEVExitLimitForgetLoop) {
@@ -1122,283 +979,6 @@ TEST_F(ScalarEvolutionsTest, SCEVFoldSumOfTruncs) {
EXPECT_EQ(Expr, ZeroConst);
}
-// Check that we can correctly identify the points at which the SCEV of the
-// AddRec can be expanded.
-TEST_F(ScalarEvolutionsTest, SCEVExpanderIsSafeToExpandAt) {
- /*
- * Create the following code:
- * func(i64 addrspace(10)* %arg)
- * top:
- * br label %L.ph
- * L.ph:
- * br label %L
- * L:
- * %phi = phi i64 [i64 0, %L.ph], [ %add, %L2 ]
- * %add = add i64 %phi2, 1
- * %cond = icmp slt i64 %add, 1000; then becomes 2000.
- * br i1 %cond, label %post, label %L2
- * post:
- * ret void
- *
- */
-
- // Create a module with non-integral pointers in it's datalayout
- Module NIM("nonintegral", Context);
- std::string DataLayout = M.getDataLayoutStr();
- if (!DataLayout.empty())
- DataLayout += "-";
- DataLayout += "ni:10";
- NIM.setDataLayout(DataLayout);
-
- Type *T_int64 = Type::getInt64Ty(Context);
- Type *T_pint64 = T_int64->getPointerTo(10);
-
- FunctionType *FTy =
- FunctionType::get(Type::getVoidTy(Context), {T_pint64}, false);
- Function *F = Function::Create(FTy, Function::ExternalLinkage, "foo", NIM);
-
- BasicBlock *Top = BasicBlock::Create(Context, "top", F);
- BasicBlock *LPh = BasicBlock::Create(Context, "L.ph", F);
- BasicBlock *L = BasicBlock::Create(Context, "L", F);
- BasicBlock *Post = BasicBlock::Create(Context, "post", F);
-
- IRBuilder<> Builder(Top);
- Builder.CreateBr(LPh);
-
- Builder.SetInsertPoint(LPh);
- Builder.CreateBr(L);
-
- Builder.SetInsertPoint(L);
- PHINode *Phi = Builder.CreatePHI(T_int64, 2);
- auto *Add = cast<Instruction>(
- Builder.CreateAdd(Phi, ConstantInt::get(T_int64, 1), "add"));
- auto *Limit = ConstantInt::get(T_int64, 1000);
- auto *Cond = cast<Instruction>(
- Builder.CreateICmp(ICmpInst::ICMP_SLT, Add, Limit, "cond"));
- Builder.CreateCondBr(Cond, L, Post);
- Phi->addIncoming(ConstantInt::get(T_int64, 0), LPh);
- Phi->addIncoming(Add, L);
-
- Builder.SetInsertPoint(Post);
- Builder.CreateRetVoid();
-
- ScalarEvolution SE = buildSE(*F);
- const SCEV *S = SE.getSCEV(Phi);
- EXPECT_TRUE(isa<SCEVAddRecExpr>(S));
- const SCEVAddRecExpr *AR = cast<SCEVAddRecExpr>(S);
- EXPECT_TRUE(AR->isAffine());
- EXPECT_FALSE(isSafeToExpandAt(AR, Top->getTerminator(), SE));
- EXPECT_FALSE(isSafeToExpandAt(AR, LPh->getTerminator(), SE));
- EXPECT_TRUE(isSafeToExpandAt(AR, L->getTerminator(), SE));
- EXPECT_TRUE(isSafeToExpandAt(AR, Post->getTerminator(), SE));
-}
-
-// Check that SCEV expander does not use the nuw instruction
-// for expansion.
-TEST_F(ScalarEvolutionsTest, SCEVExpanderNUW) {
- /*
- * Create the following code:
- * func(i64 %a)
- * entry:
- * br false, label %exit, label %body
- * body:
- * %s1 = add i64 %a, -1
- * br label %exit
- * exit:
- * %s = add nuw i64 %a, -1
- * ret %s
- */
-
- // Create a module.
- Module M("SCEVExpanderNUW", Context);
-
- Type *T_int64 = Type::getInt64Ty(Context);
-
- FunctionType *FTy =
- FunctionType::get(Type::getVoidTy(Context), { T_int64 }, false);
- Function *F = Function::Create(FTy, Function::ExternalLinkage, "func", M);
- Argument *Arg = &*F->arg_begin();
- ConstantInt *C = ConstantInt::get(Context, APInt(64, -1));
-
- BasicBlock *Entry = BasicBlock::Create(Context, "entry", F);
- BasicBlock *Body = BasicBlock::Create(Context, "body", F);
- BasicBlock *Exit = BasicBlock::Create(Context, "exit", F);
-
- IRBuilder<> Builder(Entry);
- ConstantInt *Cond = ConstantInt::get(Context, APInt(1, 0));
- Builder.CreateCondBr(Cond, Exit, Body);
-
- Builder.SetInsertPoint(Body);
- auto *S1 = cast<Instruction>(Builder.CreateAdd(Arg, C, "add"));
- Builder.CreateBr(Exit);
-
- Builder.SetInsertPoint(Exit);
- auto *S2 = cast<Instruction>(Builder.CreateAdd(Arg, C, "add"));
- S2->setHasNoUnsignedWrap(true);
- auto *R = cast<Instruction>(Builder.CreateRetVoid());
-
- ScalarEvolution SE = buildSE(*F);
- const SCEV *S = SE.getSCEV(S1);
- EXPECT_TRUE(isa<SCEVAddExpr>(S));
- SCEVExpander Exp(SE, M.getDataLayout(), "expander");
- auto *I = cast<Instruction>(Exp.expandCodeFor(S, nullptr, R));
- EXPECT_FALSE(I->hasNoUnsignedWrap());
-}
-
-// Check that SCEV expander does not use the nsw instruction
-// for expansion.
-TEST_F(ScalarEvolutionsTest, SCEVExpanderNSW) {
- /*
- * Create the following code:
- * func(i64 %a)
- * entry:
- * br false, label %exit, label %body
- * body:
- * %s1 = add i64 %a, -1
- * br label %exit
- * exit:
- * %s = add nsw i64 %a, -1
- * ret %s
- */
-
- // Create a module.
- Module M("SCEVExpanderNSW", Context);
-
- Type *T_int64 = Type::getInt64Ty(Context);
-
- FunctionType *FTy =
- FunctionType::get(Type::getVoidTy(Context), { T_int64 }, false);
- Function *F = Function::Create(FTy, Function::ExternalLinkage, "func", M);
- Argument *Arg = &*F->arg_begin();
- ConstantInt *C = ConstantInt::get(Context, APInt(64, -1));
-
- BasicBlock *Entry = BasicBlock::Create(Context, "entry", F);
- BasicBlock *Body = BasicBlock::Create(Context, "body", F);
- BasicBlock *Exit = BasicBlock::Create(Context, "exit", F);
-
- IRBuilder<> Builder(Entry);
- ConstantInt *Cond = ConstantInt::get(Context, APInt(1, 0));
- Builder.CreateCondBr(Cond, Exit, Body);
-
- Builder.SetInsertPoint(Body);
- auto *S1 = cast<Instruction>(Builder.CreateAdd(Arg, C, "add"));
- Builder.CreateBr(Exit);
-
- Builder.SetInsertPoint(Exit);
- auto *S2 = cast<Instruction>(Builder.CreateAdd(Arg, C, "add"));
- S2->setHasNoSignedWrap(true);
- auto *R = cast<Instruction>(Builder.CreateRetVoid());
-
- ScalarEvolution SE = buildSE(*F);
- const SCEV *S = SE.getSCEV(S1);
- EXPECT_TRUE(isa<SCEVAddExpr>(S));
- SCEVExpander Exp(SE, M.getDataLayout(), "expander");
- auto *I = cast<Instruction>(Exp.expandCodeFor(S, nullptr, R));
- EXPECT_FALSE(I->hasNoSignedWrap());
-}
-
-// Check that SCEV does not save the SCEV -> V
-// mapping of SCEV differ from V in NUW flag.
-TEST_F(ScalarEvolutionsTest, SCEVCacheNUW) {
- /*
- * Create the following code:
- * func(i64 %a)
- * entry:
- * %s1 = add i64 %a, -1
- * %s2 = add nuw i64 %a, -1
- * br label %exit
- * exit:
- * ret %s
- */
-
- // Create a module.
- Module M("SCEVCacheNUW", Context);
-
- Type *T_int64 = Type::getInt64Ty(Context);
-
- FunctionType *FTy =
- FunctionType::get(Type::getVoidTy(Context), { T_int64 }, false);
- Function *F = Function::Create(FTy, Function::ExternalLinkage, "func", M);
- Argument *Arg = &*F->arg_begin();
- ConstantInt *C = ConstantInt::get(Context, APInt(64, -1));
-
- BasicBlock *Entry = BasicBlock::Create(Context, "entry", F);
- BasicBlock *Exit = BasicBlock::Create(Context, "exit", F);
-
- IRBuilder<> Builder(Entry);
- auto *S1 = cast<Instruction>(Builder.CreateAdd(Arg, C, "add"));
- auto *S2 = cast<Instruction>(Builder.CreateAdd(Arg, C, "add"));
- S2->setHasNoUnsignedWrap(true);
- Builder.CreateBr(Exit);
-
- Builder.SetInsertPoint(Exit);
- auto *R = cast<Instruction>(Builder.CreateRetVoid());
-
- ScalarEvolution SE = buildSE(*F);
- // Get S2 first to move it to cache.
- const SCEV *SC2 = SE.getSCEV(S2);
- EXPECT_TRUE(isa<SCEVAddExpr>(SC2));
- // Now get S1.
- const SCEV *SC1 = SE.getSCEV(S1);
- EXPECT_TRUE(isa<SCEVAddExpr>(SC1));
- // Expand for S1, it should use S1 not S2 in spite S2
- // first in the cache.
- SCEVExpander Exp(SE, M.getDataLayout(), "expander");
- auto *I = cast<Instruction>(Exp.expandCodeFor(SC1, nullptr, R));
- EXPECT_FALSE(I->hasNoUnsignedWrap());
-}
-
-// Check that SCEV does not save the SCEV -> V
-// mapping of SCEV differ from V in NSW flag.
-TEST_F(ScalarEvolutionsTest, SCEVCacheNSW) {
- /*
- * Create the following code:
- * func(i64 %a)
- * entry:
- * %s1 = add i64 %a, -1
- * %s2 = add nsw i64 %a, -1
- * br label %exit
- * exit:
- * ret %s
- */
-
- // Create a module.
- Module M("SCEVCacheNUW", Context);
-
- Type *T_int64 = Type::getInt64Ty(Context);
-
- FunctionType *FTy =
- FunctionType::get(Type::getVoidTy(Context), { T_int64 }, false);
- Function *F = Function::Create(FTy, Function::ExternalLinkage, "func", M);
- Argument *Arg = &*F->arg_begin();
- ConstantInt *C = ConstantInt::get(Context, APInt(64, -1));
-
- BasicBlock *Entry = BasicBlock::Create(Context, "entry", F);
- BasicBlock *Exit = BasicBlock::Create(Context, "exit", F);
-
- IRBuilder<> Builder(Entry);
- auto *S1 = cast<Instruction>(Builder.CreateAdd(Arg, C, "add"));
- auto *S2 = cast<Instruction>(Builder.CreateAdd(Arg, C, "add"));
- S2->setHasNoSignedWrap(true);
- Builder.CreateBr(Exit);
-
- Builder.SetInsertPoint(Exit);
- auto *R = cast<Instruction>(Builder.CreateRetVoid());
-
- ScalarEvolution SE = buildSE(*F);
- // Get S2 first to move it to cache.
- const SCEV *SC2 = SE.getSCEV(S2);
- EXPECT_TRUE(isa<SCEVAddExpr>(SC2));
- // Now get S1.
- const SCEV *SC1 = SE.getSCEV(S1);
- EXPECT_TRUE(isa<SCEVAddExpr>(SC1));
- // Expand for S1, it should use S1 not S2 in spite S2
- // first in the cache.
- SCEVExpander Exp(SE, M.getDataLayout(), "expander");
- auto *I = cast<Instruction>(Exp.expandCodeFor(SC1, nullptr, R));
- EXPECT_FALSE(I->hasNoSignedWrap());
-}
-
// Check logic of SCEV expression size computation.
TEST_F(ScalarEvolutionsTest, SCEVComputeExpressionSize) {
/*
@@ -1449,240 +1029,6 @@ TEST_F(ScalarEvolutionsTest, SCEVComputeExpressionSize) {
EXPECT_EQ(S2S->getExpressionSize(), 5u);
}
-TEST_F(ScalarEvolutionsTest, SCEVExpandInsertCanonicalIV) {
- LLVMContext C;
- SMDiagnostic Err;
-
- // Expand the addrec produced by GetAddRec into a loop without a canonical IV.
- // SCEVExpander will insert one.
- auto TestNoCanonicalIV = [&](
- std::function<const SCEV *(ScalarEvolution & SE, Loop * L)> GetAddRec) {
- std::unique_ptr<Module> M =
- parseAssemblyString("define i32 @test(i32 %limit) { "
- "entry: "
- " br label %loop "
- "loop: "
- " %i = phi i32 [ 1, %entry ], [ %i.inc, %loop ] "
- " %i.inc = add nsw i32 %i, 1 "
- " %cont = icmp slt i32 %i.inc, %limit "
- " br i1 %cont, label %loop, label %exit "
- "exit: "
- " ret i32 %i.inc "
- "}",
- Err, C);
-
- assert(M && "Could not parse module?");
- assert(!verifyModule(*M) && "Must have been well formed!");
-
- runWithSE(*M, "test", [&](Function &F, LoopInfo &LI, ScalarEvolution &SE) {
- auto &I = GetInstByName(F, "i");
- auto *Loop = LI.getLoopFor(I.getParent());
- EXPECT_FALSE(Loop->getCanonicalInductionVariable());
-
- auto *AR = GetAddRec(SE, Loop);
- unsigned ExpectedCanonicalIVWidth = SE.getTypeSizeInBits(AR->getType());
-
- SCEVExpander Exp(SE, M->getDataLayout(), "expander");
- auto *InsertAt = I.getNextNode();
- Exp.expandCodeFor(AR, nullptr, InsertAt);
- PHINode *CanonicalIV = Loop->getCanonicalInductionVariable();
- unsigned CanonicalIVBitWidth =
- cast<IntegerType>(CanonicalIV->getType())->getBitWidth();
- EXPECT_EQ(CanonicalIVBitWidth, ExpectedCanonicalIVWidth);
- });
- };
-
- // Expand the addrec produced by GetAddRec into a loop with a canonical IV
- // which is narrower than addrec type.
- // SCEVExpander will insert a canonical IV of a wider type to expand the
- // addrec.
- auto TestNarrowCanonicalIV = [&](
- std::function<const SCEV *(ScalarEvolution & SE, Loop * L)> GetAddRec) {
- std::unique_ptr<Module> M = parseAssemblyString(
- "define i32 @test(i32 %limit) { "
- "entry: "
- " br label %loop "
- "loop: "
- " %i = phi i32 [ 1, %entry ], [ %i.inc, %loop ] "
- " %canonical.iv = phi i8 [ 0, %entry ], [ %canonical.iv.inc, %loop ] "
- " %i.inc = add nsw i32 %i, 1 "
- " %canonical.iv.inc = add i8 %canonical.iv, 1 "
- " %cont = icmp slt i32 %i.inc, %limit "
- " br i1 %cont, label %loop, label %exit "
- "exit: "
- " ret i32 %i.inc "
- "}",
- Err, C);
-
- assert(M && "Could not parse module?");
- assert(!verifyModule(*M) && "Must have been well formed!");
-
- runWithSE(*M, "test", [&](Function &F, LoopInfo &LI, ScalarEvolution &SE) {
- auto &I = GetInstByName(F, "i");
-
- auto *LoopHeaderBB = I.getParent();
- auto *Loop = LI.getLoopFor(LoopHeaderBB);
- PHINode *CanonicalIV = Loop->getCanonicalInductionVariable();
- EXPECT_EQ(CanonicalIV, &GetInstByName(F, "canonical.iv"));
-
- auto *AR = GetAddRec(SE, Loop);
-
- unsigned ExpectedCanonicalIVWidth = SE.getTypeSizeInBits(AR->getType());
- unsigned CanonicalIVBitWidth =
- cast<IntegerType>(CanonicalIV->getType())->getBitWidth();
- EXPECT_LT(CanonicalIVBitWidth, ExpectedCanonicalIVWidth);
-
- SCEVExpander Exp(SE, M->getDataLayout(), "expander");
- auto *InsertAt = I.getNextNode();
- Exp.expandCodeFor(AR, nullptr, InsertAt);
-
- // Loop over all of the PHI nodes, looking for the new canonical indvar.
- PHINode *NewCanonicalIV = nullptr;
- for (BasicBlock::iterator i = LoopHeaderBB->begin(); isa<PHINode>(i);
- ++i) {
- PHINode *PN = cast<PHINode>(i);
- if (PN == &I || PN == CanonicalIV)
- continue;
- // We expect that the only PHI added is the new canonical IV
- EXPECT_FALSE(NewCanonicalIV);
- NewCanonicalIV = PN;
- }
-
- // Check that NewCanonicalIV is a canonical IV, i.e {0,+,1}
- BasicBlock *Incoming = nullptr, *Backedge = nullptr;
- EXPECT_TRUE(Loop->getIncomingAndBackEdge(Incoming, Backedge));
- auto *Start = NewCanonicalIV->getIncomingValueForBlock(Incoming);
- EXPECT_TRUE(isa<ConstantInt>(Start));
- EXPECT_TRUE(dyn_cast<ConstantInt>(Start)->isZero());
- auto *Next = NewCanonicalIV->getIncomingValueForBlock(Backedge);
- EXPECT_TRUE(isa<BinaryOperator>(Next));
- auto *NextBinOp = dyn_cast<BinaryOperator>(Next);
- EXPECT_EQ(NextBinOp->getOpcode(), Instruction::Add);
- EXPECT_EQ(NextBinOp->getOperand(0), NewCanonicalIV);
- auto *Step = NextBinOp->getOperand(1);
- EXPECT_TRUE(isa<ConstantInt>(Step));
- EXPECT_TRUE(dyn_cast<ConstantInt>(Step)->isOne());
-
- unsigned NewCanonicalIVBitWidth =
- cast<IntegerType>(NewCanonicalIV->getType())->getBitWidth();
- EXPECT_EQ(NewCanonicalIVBitWidth, ExpectedCanonicalIVWidth);
- });
- };
-
- // Expand the addrec produced by GetAddRec into a loop with a canonical IV
- // of addrec width.
- // To expand the addrec SCEVExpander should use the existing canonical IV.
- auto TestMatchingCanonicalIV = [&](
- std::function<const SCEV *(ScalarEvolution & SE, Loop * L)> GetAddRec,
- unsigned ARBitWidth) {
- auto ARBitWidthTypeStr = "i" + std::to_string(ARBitWidth);
- std::unique_ptr<Module> M = parseAssemblyString(
- "define i32 @test(i32 %limit) { "
- "entry: "
- " br label %loop "
- "loop: "
- " %i = phi i32 [ 1, %entry ], [ %i.inc, %loop ] "
- " %canonical.iv = phi " + ARBitWidthTypeStr +
- " [ 0, %entry ], [ %canonical.iv.inc, %loop ] "
- " %i.inc = add nsw i32 %i, 1 "
- " %canonical.iv.inc = add " + ARBitWidthTypeStr +
- " %canonical.iv, 1 "
- " %cont = icmp slt i32 %i.inc, %limit "
- " br i1 %cont, label %loop, label %exit "
- "exit: "
- " ret i32 %i.inc "
- "}",
- Err, C);
-
- assert(M && "Could not parse module?");
- assert(!verifyModule(*M) && "Must have been well formed!");
-
- runWithSE(*M, "test", [&](Function &F, LoopInfo &LI, ScalarEvolution &SE) {
- auto &I = GetInstByName(F, "i");
- auto &CanonicalIV = GetInstByName(F, "canonical.iv");
-
- auto *LoopHeaderBB = I.getParent();
- auto *Loop = LI.getLoopFor(LoopHeaderBB);
- EXPECT_EQ(&CanonicalIV, Loop->getCanonicalInductionVariable());
- unsigned CanonicalIVBitWidth =
- cast<IntegerType>(CanonicalIV.getType())->getBitWidth();
-
- auto *AR = GetAddRec(SE, Loop);
- EXPECT_EQ(ARBitWidth, SE.getTypeSizeInBits(AR->getType()));
- EXPECT_EQ(CanonicalIVBitWidth, ARBitWidth);
-
- SCEVExpander Exp(SE, M->getDataLayout(), "expander");
- auto *InsertAt = I.getNextNode();
- Exp.expandCodeFor(AR, nullptr, InsertAt);
-
- // Loop over all of the PHI nodes, looking if a new canonical indvar was
- // introduced.
- PHINode *NewCanonicalIV = nullptr;
- for (BasicBlock::iterator i = LoopHeaderBB->begin(); isa<PHINode>(i);
- ++i) {
- PHINode *PN = cast<PHINode>(i);
- if (PN == &I || PN == &CanonicalIV)
- continue;
- NewCanonicalIV = PN;
- }
- EXPECT_FALSE(NewCanonicalIV);
- });
- };
-
- unsigned ARBitWidth = 16;
- Type *ARType = IntegerType::get(C, ARBitWidth);
-
- // Expand {5,+,1}
- auto GetAR2 = [&](ScalarEvolution &SE, Loop *L) -> const SCEV * {
- return SE.getAddRecExpr(SE.getConstant(APInt(ARBitWidth, 5)),
- SE.getOne(ARType), L, SCEV::FlagAnyWrap);
- };
- TestNoCanonicalIV(GetAR2);
- TestNarrowCanonicalIV(GetAR2);
- TestMatchingCanonicalIV(GetAR2, ARBitWidth);
-}
-
-TEST_F(ScalarEvolutionsTest, SCEVExpanderShlNSW) {
-
- auto checkOneCase = [this](std::string &&str) {
- LLVMContext C;
- SMDiagnostic Err;
- std::unique_ptr<Module> M = parseAssemblyString(str, Err, C);
-
- assert(M && "Could not parse module?");
- assert(!verifyModule(*M) && "Must have been well formed!");
-
- Function *F = M->getFunction("f");
- ASSERT_NE(F, nullptr) << "Could not find function 'f'";
-
- BasicBlock &Entry = F->getEntryBlock();
- LoadInst *Load = cast<LoadInst>(&Entry.front());
- BinaryOperator *And = cast<BinaryOperator>(*Load->user_begin());
-
- ScalarEvolution SE = buildSE(*F);
- const SCEV *AndSCEV = SE.getSCEV(And);
- EXPECT_TRUE(isa<SCEVMulExpr>(AndSCEV));
- EXPECT_TRUE(cast<SCEVMulExpr>(AndSCEV)->hasNoSignedWrap());
-
- SCEVExpander Exp(SE, M->getDataLayout(), "expander");
- auto *I = cast<Instruction>(Exp.expandCodeFor(AndSCEV, nullptr, And));
- EXPECT_EQ(I->getOpcode(), Instruction::Shl);
- EXPECT_FALSE(I->hasNoSignedWrap());
- };
-
- checkOneCase("define void @f(i16* %arrayidx) { "
- " %1 = load i16, i16* %arrayidx "
- " %2 = and i16 %1, -32768 "
- " ret void "
- "} ");
-
- checkOneCase("define void @f(i8* %arrayidx) { "
- " %1 = load i8, i8* %arrayidx "
- " %2 = and i8 %1, -128 "
- " ret void "
- "} ");
-}
-
TEST_F(ScalarEvolutionsTest, SCEVComputeConstantDifference) {
LLVMContext C;
SMDiagnostic Err;
@@ -1745,186 +1091,4 @@ TEST_F(ScalarEvolutionsTest, SCEVComputeConstantDifference) {
});
}
-// Test expansion of nested addrecs in CanonicalMode.
-// Expanding nested addrecs in canonical mode requiers a canonical IV of a
-// type wider than the type of the addrec itself. Currently, SCEVExpander
-// just falls back to literal mode for nested addrecs.
-TEST_F(ScalarEvolutionsTest, SCEVExpandNonAffineAddRec) {
- LLVMContext C;
- SMDiagnostic Err;
-
- // Expand the addrec produced by GetAddRec into a loop without a canonical IV.
- auto TestNoCanonicalIV = [&](std::function<const SCEVAddRecExpr *(
- ScalarEvolution & SE, Loop * L)> GetAddRec) {
- std::unique_ptr<Module> M =
- parseAssemblyString("define i32 @test(i32 %limit) { "
- "entry: "
- " br label %loop "
- "loop: "
- " %i = phi i32 [ 1, %entry ], [ %i.inc, %loop ] "
- " %i.inc = add nsw i32 %i, 1 "
- " %cont = icmp slt i32 %i.inc, %limit "
- " br i1 %cont, label %loop, label %exit "
- "exit: "
- " ret i32 %i.inc "
- "}",
- Err, C);
-
- assert(M && "Could not parse module?");
- assert(!verifyModule(*M) && "Must have been well formed!");
-
- runWithSE(*M, "test", [&](Function &F, LoopInfo &LI, ScalarEvolution &SE) {
- auto &I = GetInstByName(F, "i");
- auto *Loop = LI.getLoopFor(I.getParent());
- EXPECT_FALSE(Loop->getCanonicalInductionVariable());
-
- auto *AR = GetAddRec(SE, Loop);
- EXPECT_FALSE(AR->isAffine());
-
- SCEVExpander Exp(SE, M->getDataLayout(), "expander");
- auto *InsertAt = I.getNextNode();
- Value *V = Exp.expandCodeFor(AR, nullptr, InsertAt);
- auto *ExpandedAR = SE.getSCEV(V);
- // Check that the expansion happened literally.
- EXPECT_EQ(AR, ExpandedAR);
- });
- };
-
- // Expand the addrec produced by GetAddRec into a loop with a canonical IV
- // which is narrower than addrec type.
- auto TestNarrowCanonicalIV = [&](
- std::function<const SCEVAddRecExpr *(ScalarEvolution & SE, Loop * L)>
- GetAddRec) {
- std::unique_ptr<Module> M = parseAssemblyString(
- "define i32 @test(i32 %limit) { "
- "entry: "
- " br label %loop "
- "loop: "
- " %i = phi i32 [ 1, %entry ], [ %i.inc, %loop ] "
- " %canonical.iv = phi i8 [ 0, %entry ], [ %canonical.iv.inc, %loop ] "
- " %i.inc = add nsw i32 %i, 1 "
- " %canonical.iv.inc = add i8 %canonical.iv, 1 "
- " %cont = icmp slt i32 %i.inc, %limit "
- " br i1 %cont, label %loop, label %exit "
- "exit: "
- " ret i32 %i.inc "
- "}",
- Err, C);
-
- assert(M && "Could not parse module?");
- assert(!verifyModule(*M) && "Must have been well formed!");
-
- runWithSE(*M, "test", [&](Function &F, LoopInfo &LI, ScalarEvolution &SE) {
- auto &I = GetInstByName(F, "i");
-
- auto *LoopHeaderBB = I.getParent();
- auto *Loop = LI.getLoopFor(LoopHeaderBB);
- PHINode *CanonicalIV = Loop->getCanonicalInductionVariable();
- EXPECT_EQ(CanonicalIV, &GetInstByName(F, "canonical.iv"));
-
- auto *AR = GetAddRec(SE, Loop);
- EXPECT_FALSE(AR->isAffine());
-
- unsigned ExpectedCanonicalIVWidth = SE.getTypeSizeInBits(AR->getType());
- unsigned CanonicalIVBitWidth =
- cast<IntegerType>(CanonicalIV->getType())->getBitWidth();
- EXPECT_LT(CanonicalIVBitWidth, ExpectedCanonicalIVWidth);
-
- SCEVExpander Exp(SE, M->getDataLayout(), "expander");
- auto *InsertAt = I.getNextNode();
- Value *V = Exp.expandCodeFor(AR, nullptr, InsertAt);
- auto *ExpandedAR = SE.getSCEV(V);
- // Check that the expansion happened literally.
- EXPECT_EQ(AR, ExpandedAR);
- });
- };
-
- // Expand the addrec produced by GetAddRec into a loop with a canonical IV
- // of addrec width.
- auto TestMatchingCanonicalIV = [&](
- std::function<const SCEVAddRecExpr *(ScalarEvolution & SE, Loop * L)>
- GetAddRec,
- unsigned ARBitWidth) {
- auto ARBitWidthTypeStr = "i" + std::to_string(ARBitWidth);
- std::unique_ptr<Module> M = parseAssemblyString(
- "define i32 @test(i32 %limit) { "
- "entry: "
- " br label %loop "
- "loop: "
- " %i = phi i32 [ 1, %entry ], [ %i.inc, %loop ] "
- " %canonical.iv = phi " + ARBitWidthTypeStr +
- " [ 0, %entry ], [ %canonical.iv.inc, %loop ] "
- " %i.inc = add nsw i32 %i, 1 "
- " %canonical.iv.inc = add " + ARBitWidthTypeStr +
- " %canonical.iv, 1 "
- " %cont = icmp slt i32 %i.inc, %limit "
- " br i1 %cont, label %loop, label %exit "
- "exit: "
- " ret i32 %i.inc "
- "}",
- Err, C);
-
- assert(M && "Could not parse module?");
- assert(!verifyModule(*M) && "Must have been well formed!");
-
- runWithSE(*M, "test", [&](Function &F, LoopInfo &LI, ScalarEvolution &SE) {
- auto &I = GetInstByName(F, "i");
- auto &CanonicalIV = GetInstByName(F, "canonical.iv");
-
- auto *LoopHeaderBB = I.getParent();
- auto *Loop = LI.getLoopFor(LoopHeaderBB);
- EXPECT_EQ(&CanonicalIV, Loop->getCanonicalInductionVariable());
- unsigned CanonicalIVBitWidth =
- cast<IntegerType>(CanonicalIV.getType())->getBitWidth();
-
- auto *AR = GetAddRec(SE, Loop);
- EXPECT_FALSE(AR->isAffine());
- EXPECT_EQ(ARBitWidth, SE.getTypeSizeInBits(AR->getType()));
- EXPECT_EQ(CanonicalIVBitWidth, ARBitWidth);
-
- SCEVExpander Exp(SE, M->getDataLayout(), "expander");
- auto *InsertAt = I.getNextNode();
- Value *V = Exp.expandCodeFor(AR, nullptr, InsertAt);
- auto *ExpandedAR = SE.getSCEV(V);
- // Check that the expansion happened literally.
- EXPECT_EQ(AR, ExpandedAR);
- });
- };
-
- unsigned ARBitWidth = 16;
- Type *ARType = IntegerType::get(C, ARBitWidth);
-
- // Expand {5,+,1,+,1}
- auto GetAR3 = [&](ScalarEvolution &SE, Loop *L) -> const SCEVAddRecExpr * {
- SmallVector<const SCEV *, 3> Ops = {SE.getConstant(APInt(ARBitWidth, 5)),
- SE.getOne(ARType), SE.getOne(ARType)};
- return cast<SCEVAddRecExpr>(SE.getAddRecExpr(Ops, L, SCEV::FlagAnyWrap));
- };
- TestNoCanonicalIV(GetAR3);
- TestNarrowCanonicalIV(GetAR3);
- TestMatchingCanonicalIV(GetAR3, ARBitWidth);
-
- // Expand {5,+,1,+,1,+,1}
- auto GetAR4 = [&](ScalarEvolution &SE, Loop *L) -> const SCEVAddRecExpr * {
- SmallVector<const SCEV *, 4> Ops = {SE.getConstant(APInt(ARBitWidth, 5)),
- SE.getOne(ARType), SE.getOne(ARType),
- SE.getOne(ARType)};
- return cast<SCEVAddRecExpr>(SE.getAddRecExpr(Ops, L, SCEV::FlagAnyWrap));
- };
- TestNoCanonicalIV(GetAR4);
- TestNarrowCanonicalIV(GetAR4);
- TestMatchingCanonicalIV(GetAR4, ARBitWidth);
-
- // Expand {5,+,1,+,1,+,1,+,1}
- auto GetAR5 = [&](ScalarEvolution &SE, Loop *L) -> const SCEVAddRecExpr * {
- SmallVector<const SCEV *, 5> Ops = {SE.getConstant(APInt(ARBitWidth, 5)),
- SE.getOne(ARType), SE.getOne(ARType),
- SE.getOne(ARType), SE.getOne(ARType)};
- return cast<SCEVAddRecExpr>(SE.getAddRecExpr(Ops, L, SCEV::FlagAnyWrap));
- };
- TestNoCanonicalIV(GetAR5);
- TestNarrowCanonicalIV(GetAR5);
- TestMatchingCanonicalIV(GetAR5, ARBitWidth);
-}
-
} // end namespace llvm
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