1 files changed, 3 insertions, 2 deletions
diff --git a/llvm/include/llvm/Support/AtomicOrdering.h b/llvm/include/llvm/Support/AtomicOrdering.h
index 763bc3ea7b282..a8d89955fa2b5 100644
--- a/llvm/include/llvm/Support/AtomicOrdering.h
+++ b/llvm/include/llvm/Support/AtomicOrdering.h
@@ -53,7 +53,7 @@ template <typename Int> inline bool isValidAtomicOrderingCABI(Int I) {
 ///
 /// not_atomic-->unordered-->relaxed-->release--------------->acq_rel-->seq_cst
 ///                                   \-->consume-->acquire--/
-enum class AtomicOrdering {
+enum class AtomicOrdering : unsigned {
   NotAtomic = 0,
   Unordered = 1,
   Monotonic = 2, // Equivalent to C++'s relaxed.
@@ -61,7 +61,8 @@ enum class AtomicOrdering {
   Acquire = 4,
   Release = 5,
   AcquireRelease = 6,
-  SequentiallyConsistent = 7
+  SequentiallyConsistent = 7,
+  LAST = SequentiallyConsistent
 };
 
 bool operator<(AtomicOrdering, AtomicOrdering) = delete;