From 1e3dec662ea18131c495db50caccc57f77b7a5fe Mon Sep 17 00:00:00 2001
From: rdivacky <rdivacky@FreeBSD.org>
Date: Thu, 27 May 2010 15:15:58 +0000
Subject: Update LLVM to r104832.
---
lib/Transforms/Scalar/SimplifyLibCalls.cpp | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
(limited to 'lib/Transforms/Scalar/SimplifyLibCalls.cpp')
diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index b053cfc..7414be7 100644
--- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -558,10 +558,13 @@ struct MemCmpOpt : public LibCallOptimization {
if (Len == 0) // memcmp(s1,s2,0) -> 0
return Constant::getNullValue(CI->getType());
- 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.CreateSExt(B.CreateSub(LHSV, RHSV, "chardiff"), CI->getType());
+ // memcmp(S1,S2,1) -> *(unsigned char*)LHS - *(unsigned char*)RHS
+ if (Len == 1) {
+ Value *LHSV = B.CreateZExt(B.CreateLoad(CastToCStr(LHS, B), "lhsc"),
+ CI->getType(), "lhsv");
+ Value *RHSV = B.CreateZExt(B.CreateLoad(CastToCStr(RHS, B), "rhsc"),
+ CI->getType(), "rhsv");
+ return B.CreateSub(LHSV, RHSV, "chardiff");
}
// Constant folding: memcmp(x, y, l) -> cnst (all arguments are constant)
--
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