From b3327b700747d02ddc9e33cc47754e995b15717c Mon Sep 17 00:00:00 2001
From: Junmo Park <junmoz.park@samsung.com>
Date: Thu, 28 Jan 2016 06:23:33 +0000
Subject: [DAGCombiner] Don't add volatile or indexed stores to ChainedStores

Summary:
findBetterNeighborChains does not handle volatile or indexed stores.
However, it did not check when adding stores to ChainedStores.

Reviewers: arsenm

Differential Revision: http://reviews.llvm.org/D16463

llvm-svn: 259024
---
 llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'llvm/lib/CodeGen')

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 35801474e1c..fea77d0f216 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -14756,6 +14756,10 @@ bool DAGCombiner::findBetterNeighborChains(StoreSDNode* St) {
     while (true) {
       if (StoreSDNode *STn = dyn_cast<StoreSDNode>(NextInChain)) {
         // We found a store node. Use it for the next iteration.
+        if (STn->isVolatile() || STn->isIndexed()) {
+          Index = nullptr;
+          break;
+        }
         ChainedStores.push_back(STn);
         Index = STn;
         break;
-- 
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