From: Chris Lattner <sabre@nondot.org>
Date: Fri, 22 Apr 2005 05:36:59 +0000 (+0000)
Subject: Malloc/Free have mod/ref effects.  Do not allow CSE of function calls that
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3fe4d3cb5bd5ea7948faeed8451b61380d928808;p=oota-llvm.git

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 20422bf3189..5b3c953bcdf 100644
--- 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)