From e3e1739b7dfbc366dcf0bde1548086d172968a1a Mon Sep 17 00:00:00 2001
From: Andrew Lenharth <andrewl@lenharth.org>
Date: Mon, 20 Jun 2005 15:02:05 +0000
Subject: [PATCH] prevent GCSE from forwarding stores to loads around vaarg. 
 This is uggly, and I am trying to fix the AliasInfo, as it should catch the
 problem instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22266 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Analysis/LoadValueNumbering.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/Analysis/LoadValueNumbering.cpp b/lib/Analysis/LoadValueNumbering.cpp
index 16e79a1286f..721fe47da88 100644
--- a/lib/Analysis/LoadValueNumbering.cpp
+++ b/lib/Analysis/LoadValueNumbering.cpp
@@ -328,6 +328,10 @@ void LoadVN::getEqualNumberNodes(Value *V,
       LoadInvalidatedInBBBefore = true;
       break;
     }
+    if (dyn_cast<VAArgInst>(I)) {
+      LoadInvalidatedInBBBefore = true;
+      break;
+    }
   }
 
   // Figure out if the load is invalidated between the load and the exit of the
-- 
2.34.1