From: Dan Gohman <gohman@apple.com>
Date: Tue, 1 Apr 2008 20:56:18 +0000 (+0000)
Subject: Don't use __bzero for memset if the second argument isn't zero.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=38c92263eb83f556cdea8bf55b6d7dcc47ce131d;p=oota-llvm.git

Don't use __bzero for memset if the second argument isn't zero.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49050 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index f4ec6afd540..162979b8039 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -4562,8 +4562,9 @@ SDOperand X86TargetLowering::LowerMEMSET(SDOperand Op, SelectionDAG &DAG) {
       (I && I->getValue() > Subtarget->getMaxInlineSizeThreshold())) {
 
     // Check to see if there is a specialized entry-point for memory zeroing.
-    const char *bzeroEntry = Subtarget->getBZeroEntry();
     ConstantSDNode *V = dyn_cast<ConstantSDNode>(Op.getOperand(2));
+    const char *bzeroEntry = 
+      V && V->isNullValue() ? Subtarget->getBZeroEntry() : 0;
 
     MVT::ValueType IntPtr = getPointerTy();
     const Type *IntPtrTy = getTargetData()->getIntPtrType();