commit 02b6a6a75f29f59a4ea267608c6d3f6b1ebbf0d5
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 bc02cda5264f6cd405a0a375c5872a2c55f849cb
parent 4c49841f34baa3d0114ab8391403bee8b1a136e8

Mark strto* as readonly when the endptr is null.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64460 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/SimplifyLibCalls.cpp

diff --git a/lib/Transforms/Scalar/SimplifyLibCalls.cpp b/lib/Transforms/Scalar/SimplifyLibCalls.cpp
index fed239e..c199f30 100644
--- a/lib/Transforms/Scalar/SimplifyLibCalls.cpp
+++ b/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;
   }