[SystemZ] Add support for the "o" inline asm constraint

We don't really need any special handling of "offsettable"
memory addresses, but since some existing code uses inline
asm statements with the "o" constraint, add support for this
constraint for compatibility purposes.

llvm-svn: 317807

2 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp b/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
index cd2f708458b..6ad8932caaa 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
@@ -1379,8 +1379,11 @@ SelectInlineAsmMemoryOperand(const SDValue &Op,
     break;
   case InlineAsm::Constraint_T:
   case InlineAsm::Constraint_m:
+  case InlineAsm::Constraint_o:
     // Accept an address with a long displacement and an index.
     // m works the same as T, as this is the most general case.
+    // We don't really have any special handling of "offsettable"
+    // memory addresses, so just treat o the same as m.
     Form = SystemZAddressingMode::FormBDXNormal;
     DispRange = SystemZAddressingMode::Disp20Only;
     break;
diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.h b/llvm/lib/Target/SystemZ/SystemZISelLowering.h
index e2e27d9598d..099b4426cd1 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.h
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.h
@@ -426,6 +426,8 @@ public:
       switch(ConstraintCode[0]) {
       default:
         break;
+      case 'o':
+        return InlineAsm::Constraint_o;
       case 'Q':
         return InlineAsm::Constraint_Q;
       case 'R':