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LSR ivchain bug fix: corner case with ConstantExpr.

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Fixes PR11950.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153463 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-03-26 20:28:37 +00:00
parent d4e46a6316
commit 05fecbe42e
1 changed files with 3 additions and 2 deletions
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5
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -704,8 +704,9 @@ static bool isHighCostExpansion(const SCEV *S,
Value *UVal = U->getValue();
for (Value::use_iterator UI = UVal->use_begin(), UE = UVal->use_end();
UI != UE; ++UI) {
Instruction *User = cast<Instruction>(*UI);
if (User->getOpcode() == Instruction::Mul
// If U is a constant, it may be used by a ConstantExpr.
Instruction *User = dyn_cast<Instruction>(*UI);
if (User && User->getOpcode() == Instruction::Mul
&& SE.isSCEVable(User->getType())) {
return SE.getSCEV(User) == Mul;
}