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| author | Shuxin Yang <shuxin.llvm@gmail.com> | 2013-01-10 23:32:01 +0000 |
|---|---|---|
| committer | Shuxin Yang <shuxin.llvm@gmail.com> | 2013-01-10 23:32:01 +0000 |
| commit | 253449db20f86b655852a397245ba16ff262452f (patch) | |
| tree | 19a6a9e95b5f8fe231cffccba48b5c115492a6ca /lib/Transforms | |
| parent | 582e4f278b95d50a45c6f56e33da5e78c19afc17 (diff) | |
PR14904: Segmentation fault running pass 'Recognize loop idioms'
The root cause is mistakenly taking for granted that
"dyn_cast<Instruction>(a-Value)"
return a non-NULL instruction.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172145 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/Scalar/LoopIdiomRecognize.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/LoopIdiomRecognize.cpp b/lib/Transforms/Scalar/LoopIdiomRecognize.cpp index c4f90125ac..8258719a02 100644 --- a/lib/Transforms/Scalar/LoopIdiomRecognize.cpp +++ b/lib/Transforms/Scalar/LoopIdiomRecognize.cpp @@ -407,7 +407,7 @@ bool NclPopcountRecognize::detectIdiom(Instruction *&CntInst, // step 2: detect instructions corresponding to "x2 = x1 & (x1 - 1)" { - if (DefX2->getOpcode() != Instruction::And) + if (!DefX2 || DefX2->getOpcode() != Instruction::And) return false; BinaryOperator *SubOneOp; |