commit d234a845f90908d3ccf73718c35a0d2f0725e97f
author Nick Lewycky <nicholas@mxc.ca> Fri Feb 13 17:08:33 2009 +0000
committer Nick Lewycky <nicholas@mxc.ca> Fri Feb 13 17:08:33 2009 +0000
tree f4165a189597240e74f5d1ffdd2beeed384fff91
parent 52197c77630e01e69aef176517f4ee89c9bd2bbe

Mark strto* as readonly when the endptr is null.

llvm-svn: 64460

llvm/lib/Transforms/Scalar/SimplifyLibCalls.cpp

diff --git a/llvm/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index fed239e..c199f30 100644
--- a/llvm/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/llvm/lib/Transforms/Scalar/SimplifyLibCalls.cpp
@@ -733,8 +733,10 @@
       return 0;
 
     Value *EndPtr = CI->getOperand(2);
-    if (isa<ConstantPointerNull>(EndPtr))
+    if (isa<ConstantPointerNull>(EndPtr)) {
+      CI->setOnlyReadsMemory();
       CI->addAttribute(1, Attribute::NoCapture);
+    }
 
     return 0;
   }