commit b061c4bc44caf62a16adad6047cda60785c2d0a4
author Dan Gohman <gohman@apple.com> Mon Mar 31 20:32:52 2008 +0000
committer Dan Gohman <gohman@apple.com> Mon Mar 31 20:32:52 2008 +0000
tree d9b9092680f8b93eb8642454450be69d167722fe
parent 56a7c88cc532e8a72a8c3c303559500cd24d438b

Fix a DAGCombiner optimization to respect volatile qualification.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48994 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/DAGCombiner.cpp

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 9f44c6a..4eccb81 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -4387,7 +4387,8 @@
   // value.
   // TODO: Handle store large -> read small portion.
   // TODO: Handle TRUNCSTORE/LOADEXT
-  if (LD->getExtensionType() == ISD::NON_EXTLOAD) {
+  if (LD->getExtensionType() == ISD::NON_EXTLOAD &&
+      !LD->isVolatile()) {
     if (ISD::isNON_TRUNCStore(Chain.Val)) {
       StoreSDNode *PrevST = cast<StoreSDNode>(Chain);
       if (PrevST->getBasePtr() == Ptr &&