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| author | Andrew Trick <atrick@apple.com> | 2012-03-26 20:28:37 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2012-03-26 20:28:37 +0000 |
| commit | 05fecbe42e835b30274a7b38af27687a8abbd114 (patch) | |
| tree | 8ef687baa95e9b2e78812374aef7778d17eb2850 /lib/Transforms/Scalar/LoopStrengthReduce.cpp | |
| parent | d4e46a6316c8e1dc4623ead64b4cdd3dfb103180 (diff) | |
| download | llvm-05fecbe42e835b30274a7b38af27687a8abbd114.tar.gz llvm-05fecbe42e835b30274a7b38af27687a8abbd114.tar.bz2 llvm-05fecbe42e835b30274a7b38af27687a8abbd114.tar.xz | |
LSR ivchain bug fix: corner case with ConstantExpr.
Fixes PR11950.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153463 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/LoopStrengthReduce.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/LoopStrengthReduce.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp index f2112446ad..7e71683dc1 100644 --- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -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; } |