From 8cfd24df54025fcc56ce3707f1223958b9204813 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 23 Mar 2005 23:26:58 +0000
Subject: [PATCH] Make this more efficient by only making one virtual method
 call.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20793 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/AliasAnalysis.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/lib/Analysis/AliasAnalysis.cpp b/lib/Analysis/AliasAnalysis.cpp
index da54c1b3da1..5236435d206 100644
--- a/lib/Analysis/AliasAnalysis.cpp
+++ b/lib/Analysis/AliasAnalysis.cpp
@@ -114,11 +114,13 @@ AliasAnalysis::getModRefInfo(StoreInst *S, Value *P, unsigned Size) {
 AliasAnalysis::ModRefResult
 AliasAnalysis::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
   ModRefResult Mask = ModRef;
-  if (Function *F = CS.getCalledFunction())
-    if (onlyReadsMemory(F)) {
-      if (doesNotAccessMemory(F)) return NoModRef;
+  if (Function *F = CS.getCalledFunction()) {
+    ModRefBehavior MRB = getModRefBehavior(F, CallSite());
+    if (MRB == OnlyReadsMemory)
       Mask = Ref;
-    }
+    else if (MRB == DoesNotAccessMemory)
+      return NoModRef;
+  }
 
   if (!AA) return Mask;