1 files changed, 11 insertions, 0 deletions
diff --git a/include/llvm/Target/TargetCallingConv.h b/include/llvm/Target/TargetCallingConv.h
index a0f2674..9071bfe 100644
--- a/include/llvm/Target/TargetCallingConv.h
+++ b/include/llvm/Target/TargetCallingConv.h
@@ -134,6 +134,8 @@ namespace ISD {
 
     /// Index original Function's argument.
     unsigned OrigArgIndex;
+    /// Sentinel value for implicit machine-level input arguments.
+    static const unsigned NoArgIndex = UINT_MAX;
 
     /// Offset in bytes of current input value relative to the beginning of
     /// original argument. E.g. if argument was splitted into four 32 bit
@@ -147,6 +149,15 @@ namespace ISD {
       VT = vt.getSimpleVT();
       ArgVT = argvt;
     }
+
+    bool isOrigArg() const {
+      return OrigArgIndex != NoArgIndex;
+    }
+
+    unsigned getOrigArgIndex() const {
+      assert(OrigArgIndex != NoArgIndex && "Implicit machine-level argument");
+      return OrigArgIndex;
+    }
   };
 
   /// OutputArg - This struct carries flags and a value for a