Malloc/Free have mod/ref effects. Do not allow CSE of function calls that

call malloc/free.  This fixes PR555.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21443 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Analysis/IPA/GlobalsModRef.cpp b/lib/Analysis/IPA/GlobalsModRef.cpp
index 20422bf3189c402b3a470ec06bf5814f4ba50fc4..5b3c953bcdfa25925dc078aa94a5bcd11fd1bc83 100644 (file)
--- a/lib/Analysis/IPA/GlobalsModRef.cpp
+++ b/lib/Analysis/IPA/GlobalsModRef.cpp
@@ -310,6 +310,8 @@ void GlobalsModRef::AnalyzeSCC(std::vector<CallGraphNode *> &SCC) {
           FunctionEffect |= Ref;
         else if (isa<StoreInst>(*II))
           FunctionEffect |= Mod;
+        else if (isa<MallocInst>(*II) || isa<FreeInst>(*II))
+          FunctionEffect |= ModRef;
   }
 
   if ((FunctionEffect & Mod) == 0)