1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/EarlyCSE.cpp b/lib/Transforms/Scalar/EarlyCSE.cpp
index 394b0d3de7bd..969b9a8f8df1 100644
--- a/lib/Transforms/Scalar/EarlyCSE.cpp
+++ b/lib/Transforms/Scalar/EarlyCSE.cpp
@@ -480,6 +480,9 @@ bool EarlyCSE::processNode(DomTreeNode *Node) {
       // Ignore volatile loads.
       if (!LI->isSimple()) {
         LastStore = nullptr;
+        // Don't CSE across synchronization boundaries.
+        if (Inst->mayWriteToMemory())
+          ++CurrentGeneration;
         continue;
       }