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| author | Yunzhong Gao <Yunzhong_Gao@playstation.sony.com> | 2013-08-15 20:58:59 +0000 |
|---|---|---|
| committer | Yunzhong Gao <Yunzhong_Gao@playstation.sony.com> | 2013-08-15 20:58:59 +0000 |
| commit | b187b69170ec50fa8cf9d434ae204b86b8eb4339 (patch) | |
| tree | 02b37180e3f1885b2499c9061f5e4ac698ff45f5 /lib/Transforms/Utils | |
| parent | 14c41370e36068ae25c871d5bd8f99f92bbb7d45 (diff) | |
| download | llvm-b187b69170ec50fa8cf9d434ae204b86b8eb4339.tar.gz llvm-b187b69170ec50fa8cf9d434ae204b86b8eb4339.tar.bz2 llvm-b187b69170ec50fa8cf9d434ae204b86b8eb4339.tar.xz | |
Fixing a corner-case bug in strchr and strrchr lib call optimizations where
the input character is not converted to char before comparing with zero.
The patch was discussed in this thread:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130812/184069.html
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188489 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Utils')
| -rw-r--r-- | lib/Transforms/Utils/SimplifyLibCalls.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/Transforms/Utils/SimplifyLibCalls.cpp b/lib/Transforms/Utils/SimplifyLibCalls.cpp index 094c20154a..93720be683 100644 --- a/lib/Transforms/Utils/SimplifyLibCalls.cpp +++ b/lib/Transforms/Utils/SimplifyLibCalls.cpp @@ -477,7 +477,7 @@ struct StrChrOpt : public LibCallOptimization { // Compute the offset, make sure to handle the case when we're searching for // zero (a weird way to spell strlen). - size_t I = CharC->getSExtValue() == 0 ? + size_t I = (255 & CharC->getSExtValue()) == 0 ? Str.size() : Str.find(CharC->getSExtValue()); if (I == StringRef::npos) // Didn't find the char. strchr returns null. return Constant::getNullValue(CI->getType()); @@ -513,7 +513,7 @@ struct StrRChrOpt : public LibCallOptimization { } // Compute the offset. - size_t I = CharC->getSExtValue() == 0 ? + size_t I = (255 & CharC->getSExtValue()) == 0 ? Str.size() : Str.rfind(CharC->getSExtValue()); if (I == StringRef::npos) // Didn't find the char. Return null. return Constant::getNullValue(CI->getType()); |