1 files changed, 3 insertions, 2 deletions
diff --git a/llvm/lib/Transforms/Scalar/MergeICmps.cpp b/llvm/lib/Transforms/Scalar/MergeICmps.cpp
index ff0183a8ea2..7b3c3f99f51 100644
--- a/llvm/lib/Transforms/Scalar/MergeICmps.cpp
+++ b/llvm/lib/Transforms/Scalar/MergeICmps.cpp
@@ -81,8 +81,9 @@ BCEAtom visitICmpLoadOperand(Value *const Val) {
       LLVM_DEBUG(dbgs() << "used outside of block\n");
       return {};
     }
-    if (LoadI->isVolatile()) {
-      LLVM_DEBUG(dbgs() << "volatile\n");
+    // Do not optimize atomic loads to non-atomic memcmp
+    if (!LoadI->isSimple()) {
+      LLVM_DEBUG(dbgs() << "volatile or atomic\n");
       return {};
     }
     Value *const Addr = LoadI->getOperand(0);