1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 4b94bcfc43..cdb7e08056 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -754,6 +754,13 @@ X86TargetInfo::validateAsmConstraint(const char *&Name,
             // instructions.
     Info.setAllowsRegister();
     return true;
+  case 'Y':
+    ++Name;
+    if (*Name == 't') {
+      Info.setAllowsRegister();
+      return true;
+    }
+    return false;
   }
 }