[Hexagon] Add inline-asm constraint 'a' for modifier register class

For example
  asm ("memw(%0++%1) = %2" : : "r"(addr),"a"(mod),"r"(val) : "memory")

llvm-svn: 308763

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 01137b66b38..d488ed1dbd7 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -6887,6 +6887,9 @@ public:
           return true;
         }
         break;
+      case 'a': // Modifier register m0-m1.
+        Info.setAllowsRegister();
+        return true;
       case 's':
         // Relocatable constant.
         return true;