From: Chris Lattner <sabre@nondot.org>
Date: Thu, 8 May 2008 21:58:49 +0000 (+0000)
Subject: conservatively say that volatile stores read memory.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=748118d8aa8a66597437e6970ab389c988bbdb8b;p=oota-llvm.git

conservatively say that volatile stores read memory.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50872 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/VMCore/Instruction.cpp b/lib/VMCore/Instruction.cpp
index a446cc20a93..2316b486898 100644
--- a/lib/VMCore/Instruction.cpp
+++ b/lib/VMCore/Instruction.cpp
@@ -226,13 +226,14 @@ bool Instruction::mayReadFromMemory() const {
   default: return false;
   case Instruction::Free:
   case Instruction::VAArg:
+  case Instruction::Load:
     return true;
   case Instruction::Call:
     return !cast<CallInst>(this)->doesNotAccessMemory();
   case Instruction::Invoke:
     return !cast<InvokeInst>(this)->doesNotAccessMemory();
-  case Instruction::Load:
-    return true;
+  case Instruction::Store:
+    return cast<StoreInst>(this)->isVolatile();
   }
 }