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fix PR4284, a bug in simplifylibcalls handling memcmp. Patch by

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Benjamin Kramer!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72625 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-05-30 18:43:04 +00:00
parent 1e8c7a687d
commit 0e98e4d299
2 changed files with 15 additions and 1 deletions
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2
lib/Transforms/Scalar/SimplifyLibCalls.cpp
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@@ -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