From: Owen Anderson <resistor@mac.com>
Date: Mon, 28 Jul 2008 20:52:42 +0000 (+0000)
Subject: Don't remove volatile loads.  Thanks to Duncan for noticing this one.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=80e051dfdede65678ac66f1552278338bc1a1b33;p=oota-llvm.git

Don't remove volatile loads.  Thanks to Duncan for noticing this one.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54144 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/DeadStoreElimination.cpp b/lib/Transforms/Scalar/DeadStoreElimination.cpp
index 0011d9566e3..b75d5c4be7e 100644
--- a/lib/Transforms/Scalar/DeadStoreElimination.cpp
+++ b/lib/Transforms/Scalar/DeadStoreElimination.cpp
@@ -183,7 +183,7 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
         Instruction* dep = MD.getDependency(S);
         DominatorTree& DT = getAnalysis<DominatorTree>();
         
-        if (S->getParent() == L->getParent() &&
+        if (!S->isVolatile() && S->getParent() == L->getParent() &&
             S->getPointerOperand() == L->getPointerOperand() &&
             ( dep == MemoryDependenceAnalysis::None ||
               dep == MemoryDependenceAnalysis::NonLocal ||