vendor/llvm/llvm-release_32-r168974

1 files changed, 9 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/MachineMemOperand.h b/include/llvm/CodeGen/MachineMemOperand.h
index 1ac9080b75d5..ddb127120f20 100644
--- a/include/llvm/CodeGen/MachineMemOperand.h
+++ b/include/llvm/CodeGen/MachineMemOperand.h
@@ -151,6 +151,15 @@ public:
   bool isNonTemporal() const { return Flags & MONonTemporal; }
   bool isInvariant() const { return Flags & MOInvariant; }
 
+  /// isUnordered - Returns true if this memory operation doesn't have any
+  /// ordering constraints other than normal aliasing. Volatile and atomic
+  /// memory operations can't be reordered.
+  ///
+  /// Currently, we don't model the difference between volatile and atomic
+  /// operations. They should retain their ordering relative to all memory
+  /// operations.
+  bool isUnordered() const { return !isVolatile(); }
+
   /// refineAlignment - Update this MachineMemOperand to reflect the alignment
   /// of MMO, if it has a greater alignment. This must only be used when the
   /// new alignment applies to all users of this MachineMemOperand.