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authorChris Lattner <sabre@nondot.org>2009-05-30 18:43:04 +0000
committerChris Lattner <sabre@nondot.org>2009-05-30 18:43:04 +0000
commit464c05f504c6bf929f26a98f60b551905c12dcd1 (patch)
treedbfcbeed288cbb5b81e63ec68b152df08b7f8d7e /lib
parentf122c7ec847bb904fca8e99343564fbd8564d5e6 (diff)
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fix PR4284, a bug in simplifylibcalls handling memcmp. Patch by
Benjamin Kramer! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72625 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
-rw-r--r--lib/Transforms/Scalar/SimplifyLibCalls.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index 8c41c72..4b00640 100644
--- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -878,7 +878,7 @@ struct VISIBILITY_HIDDEN MemCmpOpt : public LibCallOptimization {
if (Len == 1) { // memcmp(S1,S2,1) -> *LHS - *RHS
Value *LHSV = B.CreateLoad(CastToCStr(LHS, B), "lhsv");
Value *RHSV = B.CreateLoad(CastToCStr(RHS, B), "rhsv");
- return B.CreateZExt(B.CreateSub(LHSV, RHSV, "chardiff"), CI->getType());
+ return B.CreateSExt(B.CreateSub(LHSV, RHSV, "chardiff"), CI->getType());
}
// memcmp(S1,S2,2) != 0 -> (*(short*)LHS ^ *(short*)RHS) != 0