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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2011-01-06 14:22:52 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2011-01-06 14:22:52 +0000 |
| commit | 8143a84c46b8d2fb58eddb46d84dd5d44d03cb6c (patch) | |
| tree | 597092e9f340fae3b7c8e2d2c08dfb04f7801bd5 /lib/Transforms/InstCombine/InstCombineCalls.cpp | |
| parent | 7d9f51f4b5e594c9c72717888a68c0c8a2f1267b (diff) | |
InstCombine: Turn _chk functions into the "unsafe" variant if length and max langth are equal.
This happens when we take the (non-constant) length from a malloc.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122961 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/InstCombine/InstCombineCalls.cpp')
| -rw-r--r-- | lib/Transforms/InstCombine/InstCombineCalls.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineCalls.cpp b/lib/Transforms/InstCombine/InstCombineCalls.cpp index 603a01075a..ecd2243c35 100644 --- a/lib/Transforms/InstCombine/InstCombineCalls.cpp +++ b/lib/Transforms/InstCombine/InstCombineCalls.cpp @@ -722,6 +722,8 @@ protected: NewInstruction = IC->ReplaceInstUsesWith(*CI, With); } bool isFoldable(unsigned SizeCIOp, unsigned SizeArgOp, bool isString) const { + if (CI->getArgOperand(SizeCIOp) == CI->getArgOperand(SizeArgOp)) + return true; if (ConstantInt *SizeCI = dyn_cast<ConstantInt>(CI->getArgOperand(SizeCIOp))) { if (SizeCI->isAllOnesValue()) |