commit c3384995258efcec26acf3a88715dc99cd871c3e
author Torok Edwin <edwintorok@gmail.com> Thu Sep 24 18:33:42 2009 +0000
committer Torok Edwin <edwintorok@gmail.com> Thu Sep 24 18:33:42 2009 +0000
tree a1bfd4d5818635b817206fe5ee991673baab2901
parent 96b930ddc7f0df9e278a5cb65ad77a559a20964e

Constant propagating byval pointer is safe if function is readonly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82700 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/IPO/IPConstantPropagation.cpp

diff --git a/lib/Transforms/IPO/IPConstantPropagation.cpp b/lib/Transforms/IPO/IPConstantPropagation.cpp
index 95c3f4e..7b0e9c7 100644
--- a/lib/Transforms/IPO/IPConstantPropagation.cpp
+++ b/lib/Transforms/IPO/IPConstantPropagation.cpp
@@ -130,8 +130,8 @@
   Function::arg_iterator AI = F.arg_begin();
   for (unsigned i = 0, e = ArgumentConstants.size(); i != e; ++i, ++AI) {
     // Do we have a constant argument?
-    if (ArgumentConstants[i].second || AI->use_empty() || 
-        (AI->hasByValAttr() && isa<PointerType>(AI->getType())))
+    if (ArgumentConstants[i].second || AI->use_empty() ||
+        (AI->hasByValAttr() && !F.onlyReadsMemory()))
       continue;
   
     Value *V = ArgumentConstants[i].first;