From: Chris Lattner <sabre@nondot.org>
Date: Mon, 8 Sep 2003 18:17:14 +0000 (+0000)
Subject: Do not hoist volatile loads
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=61c1e7e32def2978441c699dcf9943dbe14aad98;p=oota-llvm.git

Do not hoist volatile loads


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8399 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/LICM.cpp b/lib/Transforms/Scalar/LICM.cpp
index f2cf68b4e9c..4940566b2a7 100644
--- a/lib/Transforms/Scalar/LICM.cpp
+++ b/lib/Transforms/Scalar/LICM.cpp
@@ -316,7 +316,7 @@ bool LICM::SafeToHoist(Instruction &Inst) {
 
 
 void LICM::visitLoadInst(LoadInst &LI) {
-  if (isLoopInvariant(LI.getOperand(0)) &&
+  if (isLoopInvariant(LI.getOperand(0)) && !LI.isVolatile() &&
       !pointerInvalidatedByLoop(LI.getOperand(0)) && SafeToHoist(LI)) {
     hoist(LI);
     ++NumHoistedLoads;