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Reland "[SCEVExpander] Add option to preserve LCSSA directly."

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This reverts the revert commit dc2867576886247cbe351e7c63618c09ab6af808.

It includes a fix for Polly, which uses SCEVExpander on IR that is not
in LCSSA form. Set PreserveLCSSA = false in that case, to ensure we do
not introduce LCSSA phis where there were none before.
This commit is contained in:
Florian Hahn 2020-07-29 19:35:14 +01:00
parent d6bf6e55ee
commit bf9e3782d5
4 changed files with 166 additions and 61 deletions
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41
include/llvm/Transforms/Utils/ScalarEvolutionExpander.h
View File

@ -52,6 +52,9 @@ class SCEVExpander : public SCEVVisitor<SCEVExpander, Value *> {
// New instructions receive a name to identify them with the current pass.
const char *IVName;
/// Indicates whether LCSSA phis should be created for inserted values.
bool PreserveLCSSA;
// InsertedExpressions caches Values for reuse, so must track RAUW.
DenseMap<std::pair<const SCEV *, Instruction *>, TrackingVH<Value>>
InsertedExpressions;
@ -146,9 +149,10 @@ class SCEVExpander : public SCEVVisitor<SCEVExpander, Value *> {
public:
/// Construct a SCEVExpander in "canonical" mode.
explicit SCEVExpander(ScalarEvolution &se, const DataLayout &DL,
const char *name)
: SE(se), DL(DL), IVName(name), IVIncInsertLoop(nullptr),
IVIncInsertPos(nullptr), CanonicalMode(true), LSRMode(false),
const char *name, bool PreserveLCSSA = true)
: SE(se), DL(DL), IVName(name), PreserveLCSSA(PreserveLCSSA),
IVIncInsertLoop(nullptr), IVIncInsertPos(nullptr), CanonicalMode(true),
LSRMode(false),
Builder(se.getContext(), TargetFolder(DL),
IRBuilderCallbackInserter(
[this](Instruction *I) { rememberInstruction(I); })) {
@ -223,14 +227,18 @@ public:
const TargetTransformInfo *TTI = nullptr);
/// Insert code to directly compute the specified SCEV expression into the
/// program. The inserted code is inserted into the specified block.
Value *expandCodeFor(const SCEV *SH, Type *Ty, Instruction *I);
/// program. The code is inserted into the specified block.
Value *expandCodeFor(const SCEV *SH, Type *Ty, Instruction *I) {
return expandCodeForImpl(SH, Ty, I, true);
}
/// Insert code to directly compute the specified SCEV expression into the
/// program. The inserted code is inserted into the SCEVExpander's current
/// program. The code is inserted into the SCEVExpander's current
/// insertion point. If a type is specified, the result will be expanded to
/// have that type, with a cast if necessary.
Value *expandCodeFor(const SCEV *SH, Type *Ty = nullptr);
Value *expandCodeFor(const SCEV *SH, Type *Ty = nullptr) {
return expandCodeForImpl(SH, Ty, true);
}
/// Generates a code sequence that evaluates this predicate. The inserted
/// instructions will be at position \p Loc. The result will be of type i1
@ -338,6 +346,20 @@ public:
private:
LLVMContext &getContext() const { return SE.getContext(); }
/// Insert code to directly compute the specified SCEV expression into the
/// program. The code is inserted into the SCEVExpander's current
/// insertion point. If a type is specified, the result will be expanded to
/// have that type, with a cast if necessary. If \p Root is true, this
/// indicates that \p SH is the top-level expression to expand passed from
/// an external client call.
Value *expandCodeForImpl(const SCEV *SH, Type *Ty, bool Root);
/// Insert code to directly compute the specified SCEV expression into the
/// program. The code is inserted into the specified block. If \p
/// Root is true, this indicates that \p SH is the top-level expression to
/// expand passed from an external client call.
Value *expandCodeForImpl(const SCEV *SH, Type *Ty, Instruction *I, bool Root);
/// Recursive helper function for isHighCostExpansion.
bool isHighCostExpansionHelper(const SCEV *S, Loop *L, const Instruction &At,
int &BudgetRemaining,
@ -419,6 +441,11 @@ private:
Instruction *Pos, PHINode *LoopPhi);
void fixupInsertPoints(Instruction *I);
/// If required, create LCSSA PHIs for \p Users' operand \p OpIdx. If new
/// LCSSA PHIs have been created, return the LCSSA PHI available at \p User.
/// If no PHIs have been created, return the unchanged operand \p OpIdx.
Value *fixupLCSSAFormFor(Instruction *User, unsigned OpIdx);
};
} // namespace llvm

6
lib/Transforms/Scalar/LoopStrengthReduce.cpp
View File

@ -5514,8 +5514,8 @@ void LSRInstance::ImplementSolution(
// we can remove them after we are done working.
SmallVector<WeakTrackingVH, 16> DeadInsts;
SCEVExpander Rewriter(SE, L->getHeader()->getModule()->getDataLayout(),
"lsr");
SCEVExpander Rewriter(SE, L->getHeader()->getModule()->getDataLayout(), "lsr",
false);
#ifndef NDEBUG
Rewriter.setDebugType(DEBUG_TYPE);
#endif
@ -5780,7 +5780,7 @@ static bool ReduceLoopStrength(Loop *L, IVUsers &IU, ScalarEvolution &SE,
if (EnablePhiElim && L->isLoopSimplifyForm()) {
SmallVector<WeakTrackingVH, 16> DeadInsts;
const DataLayout &DL = L->getHeader()->getModule()->getDataLayout();
SCEVExpander Rewriter(SE, DL, "lsr");
SCEVExpander Rewriter(SE, DL, "lsr", false);
#ifndef NDEBUG
Rewriter.setDebugType(DEBUG_TYPE);
#endif

173
lib/Transforms/Utils/ScalarEvolutionExpander.cpp
View File

@ -27,6 +27,7 @@
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Utils/LoopUtils.h"
using namespace llvm;
@ -461,9 +462,10 @@ Value *SCEVExpander::expandAddToGEP(const SCEV *const *op_begin,
// we didn't find any operands that could be factored, tentatively
// assume that element zero was selected (since the zero offset
// would obviously be folded away).
Value *Scaled = ScaledOps.empty() ?
Constant::getNullValue(Ty) :
expandCodeFor(SE.getAddExpr(ScaledOps), Ty);
Value *Scaled =
ScaledOps.empty()
? Constant::getNullValue(Ty)
: expandCodeForImpl(SE.getAddExpr(ScaledOps), Ty, false);
GepIndices.push_back(Scaled);
// Collect struct field index operands.
@ -522,7 +524,7 @@ Value *SCEVExpander::expandAddToGEP(const SCEV *const *op_begin,
SE.DT.dominates(cast<Instruction>(V), &*Builder.GetInsertPoint()));
// Expand the operands for a plain byte offset.
Value *Idx = expandCodeFor(SE.getAddExpr(Ops), Ty);
Value *Idx = expandCodeForImpl(SE.getAddExpr(Ops), Ty, false);
// Fold a GEP with constant operands.
if (Constant *CLHS = dyn_cast<Constant>(V))
@ -743,14 +745,14 @@ Value *SCEVExpander::visitAddExpr(const SCEVAddExpr *S) {
Sum = expandAddToGEP(NewOps.begin(), NewOps.end(), PTy, Ty, expand(Op));
} else if (Op->isNonConstantNegative()) {
// Instead of doing a negate and add, just do a subtract.
Value *W = expandCodeFor(SE.getNegativeSCEV(Op), Ty);
Value *W = expandCodeForImpl(SE.getNegativeSCEV(Op), Ty, false);
Sum = InsertNoopCastOfTo(Sum, Ty);
Sum = InsertBinop(Instruction::Sub, Sum, W, SCEV::FlagAnyWrap,
/*IsSafeToHoist*/ true);
++I;
} else {
// A simple add.
Value *W = expandCodeFor(Op, Ty);
Value *W = expandCodeForImpl(Op, Ty, false);
Sum = InsertNoopCastOfTo(Sum, Ty);
// Canonicalize a constant to the RHS.
if (isa<Constant>(Sum)) std::swap(Sum, W);
@ -802,7 +804,7 @@ Value *SCEVExpander::visitMulExpr(const SCEVMulExpr *S) {
// Calculate powers with exponents 1, 2, 4, 8 etc. and include those of them
// that are needed into the result.
Value *P = expandCodeFor(I->second, Ty);
Value *P = expandCodeForImpl(I->second, Ty, false);
Value *Result = nullptr;
if (Exponent & 1)
Result = P;
@ -861,7 +863,7 @@ Value *SCEVExpander::visitMulExpr(const SCEVMulExpr *S) {
Value *SCEVExpander::visitUDivExpr(const SCEVUDivExpr *S) {
Type *Ty = SE.getEffectiveSCEVType(S->getType());
Value *LHS = expandCodeFor(S->getLHS(), Ty);
Value *LHS = expandCodeForImpl(S->getLHS(), Ty, false);
if (const SCEVConstant *SC = dyn_cast<SCEVConstant>(S->getRHS())) {
const APInt &RHS = SC->getAPInt();
if (RHS.isPowerOf2())
@ -870,7 +872,7 @@ Value *SCEVExpander::visitUDivExpr(const SCEVUDivExpr *S) {
SCEV::FlagAnyWrap, /*IsSafeToHoist*/ true);
}
Value *RHS = expandCodeFor(S->getRHS(), Ty);
Value *RHS = expandCodeForImpl(S->getRHS(), Ty, false);
return InsertBinop(Instruction::UDiv, LHS, RHS, SCEV::FlagAnyWrap,
/*IsSafeToHoist*/ SE.isKnownNonZero(S->getRHS()));
}
@ -1265,8 +1267,9 @@ SCEVExpander::getAddRecExprPHILiterally(const SCEVAddRecExpr *Normalized,
// Expand code for the start value into the loop preheader.
assert(L->getLoopPreheader() &&
"Can't expand add recurrences without a loop preheader!");
Value *StartV = expandCodeFor(Normalized->getStart(), ExpandTy,
L->getLoopPreheader()->getTerminator());
Value *StartV =
expandCodeForImpl(Normalized->getStart(), ExpandTy,
L->getLoopPreheader()->getTerminator(), false);
// StartV must have been be inserted into L's preheader to dominate the new
// phi.
@ -1284,8 +1287,8 @@ SCEVExpander::getAddRecExprPHILiterally(const SCEVAddRecExpr *Normalized,
if (useSubtract)
Step = SE.getNegativeSCEV(Step);
// Expand the step somewhere that dominates the loop header.
Value *StepV = expandCodeFor(Step, IntTy,
&*L->getHeader()->getFirstInsertionPt());
Value *StepV = expandCodeForImpl(
Step, IntTy, &*L->getHeader()->getFirstInsertionPt(), false);
// The no-wrap behavior proved by IsIncrement(NUW|NSW) is only applicable if
// we actually do emit an addition. It does not apply if we emit a
@ -1430,8 +1433,8 @@ Value *SCEVExpander::expandAddRecExprLiterally(const SCEVAddRecExpr *S) {
{
// Expand the step somewhere that dominates the loop header.
SCEVInsertPointGuard Guard(Builder, this);
StepV = expandCodeFor(Step, IntTy,
&*L->getHeader()->getFirstInsertionPt());
StepV = expandCodeForImpl(
Step, IntTy, &*L->getHeader()->getFirstInsertionPt(), false);
}
Result = expandIVInc(PN, StepV, L, ExpandTy, IntTy, useSubtract);
}
@ -1450,8 +1453,8 @@ Value *SCEVExpander::expandAddRecExprLiterally(const SCEVAddRecExpr *S) {
// Invert the result.
if (InvertStep)
Result = Builder.CreateSub(expandCodeFor(Normalized->getStart(), TruncTy),
Result);
Result = Builder.CreateSub(
expandCodeForImpl(Normalized->getStart(), TruncTy, false), Result);
}
// Re-apply any non-loop-dominating scale.
@ -1459,22 +1462,22 @@ Value *SCEVExpander::expandAddRecExprLiterally(const SCEVAddRecExpr *S) {
assert(S->isAffine() && "Can't linearly scale non-affine recurrences.");
Result = InsertNoopCastOfTo(Result, IntTy);
Result = Builder.CreateMul(Result,
expandCodeFor(PostLoopScale, IntTy));
expandCodeForImpl(PostLoopScale, IntTy, false));
}
// Re-apply any non-loop-dominating offset.
if (PostLoopOffset) {
if (PointerType *PTy = dyn_cast<PointerType>(ExpandTy)) {
if (Result->getType()->isIntegerTy()) {
Value *Base = expandCodeFor(PostLoopOffset, ExpandTy);
Value *Base = expandCodeForImpl(PostLoopOffset, ExpandTy, false);
Result = expandAddToGEP(SE.getUnknown(Result), PTy, IntTy, Base);
} else {
Result = expandAddToGEP(PostLoopOffset, PTy, IntTy, Result);
}
} else {
Result = InsertNoopCastOfTo(Result, IntTy);
Result = Builder.CreateAdd(Result,
expandCodeFor(PostLoopOffset, IntTy));
Result = Builder.CreateAdd(
Result, expandCodeForImpl(PostLoopOffset, IntTy, false));
}
}
@ -1516,8 +1519,8 @@ Value *SCEVExpander::visitAddRecExpr(const SCEVAddRecExpr *S) {
S->getNoWrapFlags(SCEV::FlagNW)));
BasicBlock::iterator NewInsertPt =
findInsertPointAfter(cast<Instruction>(V), Builder.GetInsertBlock());
V = expandCodeFor(SE.getTruncateExpr(SE.getUnknown(V), Ty), nullptr,
&*NewInsertPt);
V = expandCodeForImpl(SE.getTruncateExpr(SE.getUnknown(V), Ty), nullptr,
&*NewInsertPt, false);
return V;
}
@ -1632,22 +1635,25 @@ Value *SCEVExpander::visitAddRecExpr(const SCEVAddRecExpr *S) {
Value *SCEVExpander::visitTruncateExpr(const SCEVTruncateExpr *S) {
Type *Ty = SE.getEffectiveSCEVType(S->getType());
Value *V = expandCodeFor(S->getOperand(),
SE.getEffectiveSCEVType(S->getOperand()->getType()));
Value *V = expandCodeForImpl(
S->getOperand(), SE.getEffectiveSCEVType(S->getOperand()->getType()),
false);
return Builder.CreateTrunc(V, Ty);
}
Value *SCEVExpander::visitZeroExtendExpr(const SCEVZeroExtendExpr *S) {
Type *Ty = SE.getEffectiveSCEVType(S->getType());
Value *V = expandCodeFor(S->getOperand(),
SE.getEffectiveSCEVType(S->getOperand()->getType()));
Value *V = expandCodeForImpl(
S->getOperand(), SE.getEffectiveSCEVType(S->getOperand()->getType()),
false);
return Builder.CreateZExt(V, Ty);
}
Value *SCEVExpander::visitSignExtendExpr(const SCEVSignExtendExpr *S) {
Type *Ty = SE.getEffectiveSCEVType(S->getType());
Value *V = expandCodeFor(S->getOperand(),
SE.getEffectiveSCEVType(S->getOperand()->getType()));
Value *V = expandCodeForImpl(
S->getOperand(), SE.getEffectiveSCEVType(S->getOperand()->getType()),
false);
return Builder.CreateSExt(V, Ty);
}
@ -1662,7 +1668,7 @@ Value *SCEVExpander::visitSMaxExpr(const SCEVSMaxExpr *S) {
Ty = SE.getEffectiveSCEVType(Ty);
LHS = InsertNoopCastOfTo(LHS, Ty);
}
Value *RHS = expandCodeFor(S->getOperand(i), Ty);
Value *RHS = expandCodeForImpl(S->getOperand(i), Ty, false);
Value *ICmp = Builder.CreateICmpSGT(LHS, RHS);
Value *Sel = Builder.CreateSelect(ICmp, LHS, RHS, "smax");
LHS = Sel;
@ -1685,7 +1691,7 @@ Value *SCEVExpander::visitUMaxExpr(const SCEVUMaxExpr *S) {
Ty = SE.getEffectiveSCEVType(Ty);
LHS = InsertNoopCastOfTo(LHS, Ty);
}
Value *RHS = expandCodeFor(S->getOperand(i), Ty);
Value *RHS = expandCodeForImpl(S->getOperand(i), Ty, false);
Value *ICmp = Builder.CreateICmpUGT(LHS, RHS);
Value *Sel = Builder.CreateSelect(ICmp, LHS, RHS, "umax");
LHS = Sel;
@ -1708,7 +1714,7 @@ Value *SCEVExpander::visitSMinExpr(const SCEVSMinExpr *S) {
Ty = SE.getEffectiveSCEVType(Ty);
LHS = InsertNoopCastOfTo(LHS, Ty);
}
Value *RHS = expandCodeFor(S->getOperand(i), Ty);
Value *RHS = expandCodeForImpl(S->getOperand(i), Ty, false);
Value *ICmp = Builder.CreateICmpSLT(LHS, RHS);
Value *Sel = Builder.CreateSelect(ICmp, LHS, RHS, "smin");
LHS = Sel;
@ -1731,7 +1737,7 @@ Value *SCEVExpander::visitUMinExpr(const SCEVUMinExpr *S) {
Ty = SE.getEffectiveSCEVType(Ty);
LHS = InsertNoopCastOfTo(LHS, Ty);
}
Value *RHS = expandCodeFor(S->getOperand(i), Ty);
Value *RHS = expandCodeForImpl(S->getOperand(i), Ty, false);
Value *ICmp = Builder.CreateICmpULT(LHS, RHS);
Value *Sel = Builder.CreateSelect(ICmp, LHS, RHS, "umin");
LHS = Sel;
@ -1743,15 +1749,43 @@ Value *SCEVExpander::visitUMinExpr(const SCEVUMinExpr *S) {
return LHS;
}
Value *SCEVExpander::expandCodeFor(const SCEV *SH, Type *Ty,
Instruction *IP) {
Value *SCEVExpander::expandCodeForImpl(const SCEV *SH, Type *Ty,
Instruction *IP, bool Root) {
setInsertPoint(IP);
return expandCodeFor(SH, Ty);
Value *V = expandCodeForImpl(SH, Ty, Root);
return V;
}
Value *SCEVExpander::expandCodeFor(const SCEV *SH, Type *Ty) {
Value *SCEVExpander::expandCodeForImpl(const SCEV *SH, Type *Ty, bool Root) {
// Expand the code for this SCEV.
Value *V = expand(SH);
if (PreserveLCSSA) {
if (auto *Inst = dyn_cast<Instruction>(V)) {
// Create a temporary instruction to at the current insertion point, so we
// can hand it off to the helper to create LCSSA PHIs if required for the
// new use.
// FIXME: Ideally formLCSSAForInstructions (used in fixupLCSSAFormFor)
// would accept a insertion point and return an LCSSA phi for that
// insertion point, so there is no need to insert & remove the temporary
// instruction.
Instruction *Tmp;
if (Inst->getType()->isIntegerTy())
Tmp = cast<Instruction>(Builder.CreateAdd(Inst, Inst));
else {
assert(Inst->getType()->isPointerTy());
Tmp = cast<Instruction>(Builder.CreateGEP(Inst, Builder.getInt32(1)));
}
V = fixupLCSSAFormFor(Tmp, 0);
// Clean up temporary instruction.
InsertedValues.erase(Tmp);
InsertedPostIncValues.erase(Tmp);
Tmp->eraseFromParent();
}
}
InsertedExpressions[std::make_pair(SH, &*Builder.GetInsertPoint())] = V;
if (Ty) {
assert(SE.getTypeSizeInBits(Ty) == SE.getTypeSizeInBits(SH->getType()) &&
"non-trivial casts should be done with the SCEVs directly!");
@ -1891,10 +1925,28 @@ Value *SCEVExpander::expand(const SCEV *S) {
}
void SCEVExpander::rememberInstruction(Value *I) {
if (!PostIncLoops.empty())
InsertedPostIncValues.insert(I);
else
InsertedValues.insert(I);
auto DoInsert = [this](Value *V) {
if (!PostIncLoops.empty())
InsertedPostIncValues.insert(V);
else
InsertedValues.insert(V);
};
DoInsert(I);
if (!PreserveLCSSA)
return;
if (auto *Inst = dyn_cast<Instruction>(I)) {
// A new instruction has been added, which might introduce new uses outside
// a defining loop. Fix LCSSA from for each operand of the new instruction,
// if required.
for (unsigned OpIdx = 0, OpEnd = Inst->getNumOperands(); OpIdx != OpEnd;
OpIdx++) {
auto *V = fixupLCSSAFormFor(Inst, OpIdx);
if (V != I)
DoInsert(V);
}
}
}
/// getOrInsertCanonicalInductionVariable - This method returns the
@ -1913,9 +1965,8 @@ SCEVExpander::getOrInsertCanonicalInductionVariable(const Loop *L,
// Emit code for it.
SCEVInsertPointGuard Guard(Builder, this);
PHINode *V =
cast<PHINode>(expandCodeFor(H, nullptr,
&*L->getHeader()->getFirstInsertionPt()));
PHINode *V = cast<PHINode>(expandCodeForImpl(
H, nullptr, &*L->getHeader()->getFirstInsertionPt(), false));
return V;
}
@ -2315,8 +2366,10 @@ Value *SCEVExpander::expandCodeForPredicate(const SCEVPredicate *Pred,
Value *SCEVExpander::expandEqualPredicate(const SCEVEqualPredicate *Pred,
Instruction *IP) {
Value *Expr0 = expandCodeFor(Pred->getLHS(), Pred->getLHS()->getType(), IP);
Value *Expr1 = expandCodeFor(Pred->getRHS(), Pred->getRHS()->getType(), IP);
Value *Expr0 =
expandCodeForImpl(Pred->getLHS(), Pred->getLHS()->getType(), IP, false);
Value *Expr1 =
expandCodeForImpl(Pred->getRHS(), Pred->getRHS()->getType(), IP, false);
Builder.SetInsertPoint(IP);
auto *I = Builder.CreateICmpNE(Expr0, Expr1, "ident.check");
@ -2348,15 +2401,16 @@ Value *SCEVExpander::generateOverflowCheck(const SCEVAddRecExpr *AR,
IntegerType *CountTy = IntegerType::get(Loc->getContext(), SrcBits);
Builder.SetInsertPoint(Loc);
Value *TripCountVal = expandCodeFor(ExitCount, CountTy, Loc);
Value *TripCountVal = expandCodeForImpl(ExitCount, CountTy, Loc, false);
IntegerType *Ty =
IntegerType::get(Loc->getContext(), SE.getTypeSizeInBits(ARTy));
Type *ARExpandTy = DL.isNonIntegralPointerType(ARTy) ? ARTy : Ty;
Value *StepValue = expandCodeFor(Step, Ty, Loc);
Value *NegStepValue = expandCodeFor(SE.getNegativeSCEV(Step), Ty, Loc);
Value *StartValue = expandCodeFor(Start, ARExpandTy, Loc);
Value *StepValue = expandCodeForImpl(Step, Ty, Loc, false);
Value *NegStepValue =
expandCodeForImpl(SE.getNegativeSCEV(Step), Ty, Loc, false);
Value *StartValue = expandCodeForImpl(Start, ARExpandTy, Loc, false);
ConstantInt *Zero =
ConstantInt::get(Loc->getContext(), APInt::getNullValue(DstBits));
@ -2459,6 +2513,25 @@ Value *SCEVExpander::expandUnionPredicate(const SCEVUnionPredicate *Union,
return Check;
}
Value *SCEVExpander::fixupLCSSAFormFor(Instruction *User, unsigned OpIdx) {
assert(PreserveLCSSA);
SmallVector<Instruction *, 1> ToUpdate;
auto *OpV = User->getOperand(OpIdx);
auto *OpI = dyn_cast<Instruction>(OpV);
if (!OpI)
return OpV;
Loop *DefLoop = SE.LI.getLoopFor(OpI->getParent());
Loop *UseLoop = SE.LI.getLoopFor(User->getParent());
if (!DefLoop || UseLoop == DefLoop || DefLoop->contains(UseLoop))
return OpV;
ToUpdate.push_back(OpI);
formLCSSAForInstructions(ToUpdate, SE.DT, SE.LI, &SE);
return User->getOperand(OpIdx);
}
namespace {
// Search for a SCEV subexpression that is not safe to expand. Any expression
// that may expand to a !isSafeToSpeculativelyExecute value is unsafe, namely

7
unittests/Transforms/Utils/ScalarEvolutionExpanderTest.cpp
View File

@ -265,7 +265,7 @@ TEST_F(ScalarEvolutionExpanderTest, SCEVExpanderIsSafeToExpandAt) {
Phi->addIncoming(Add, L);
Builder.SetInsertPoint(Post);
Builder.CreateRetVoid();
Instruction *Ret = Builder.CreateRetVoid();
ScalarEvolution SE = buildSE(*F);
const SCEV *S = SE.getSCEV(Phi);
@ -276,6 +276,11 @@ TEST_F(ScalarEvolutionExpanderTest, SCEVExpanderIsSafeToExpandAt) {
EXPECT_FALSE(isSafeToExpandAt(AR, LPh->getTerminator(), SE));
EXPECT_TRUE(isSafeToExpandAt(AR, L->getTerminator(), SE));
EXPECT_TRUE(isSafeToExpandAt(AR, Post->getTerminator(), SE));
EXPECT_TRUE(LI->getLoopFor(L)->isLCSSAForm(*DT));
SCEVExpander Exp(SE, M.getDataLayout(), "expander");
Exp.expandCodeFor(SE.getSCEV(Add), nullptr, Ret);
EXPECT_TRUE(LI->getLoopFor(L)->isLCSSAForm(*DT));
}
// Check that SCEV expander does not use the nuw instruction