From e331a65c794c93b7c7792b7ba08ab6069b9c086d Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 29 Apr 2008 04:58:38 +0000
Subject: don't delete the last store to an alloca if the store is volatile.

llvm-svn: 50390
---
 llvm/lib/Transforms/Scalar/InstructionCombining.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'llvm/lib/Transforms/Scalar/InstructionCombining.cpp')

diff --git a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
index 655ab102599..c707e6ee670 100644
--- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -10311,7 +10311,7 @@ Instruction *InstCombiner::visitStoreInst(StoreInst &SI) {
   
   // If the RHS is an alloca with a single use, zapify the store, making the
   // alloca dead.
-  if (Ptr->hasOneUse()) {
+  if (Ptr->hasOneUse() && !SI.isVolatile()) {
     if (isa<AllocaInst>(Ptr)) {
       EraseInstFromFunction(SI);
       ++NumCombined;
-- 
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