Add some comments explaining what MVT and EVT are, and how they differ.

[oota-llvm.git] / include / llvm / CodeGen / CallingConvLower.h

diff --git a/include/llvm/CodeGen/CallingConvLower.h b/include/llvm/CodeGen/CallingConvLower.h
index 7911907e89435c8a292345ca6f455e669072895a..a47512c4b0ef64c92a2d7951607beb4761a7c848 100644 (file)
--- a/include/llvm/CodeGen/CallingConvLower.h
+++ b/include/llvm/CodeGen/CallingConvLower.h
@@ -129,7 +129,7 @@ public:
 };
 
 /// CCAssignFn - This function assigns a location for Val, updating State to
-/// reflect the change.
+/// reflect the change.  It returns 'true' if it failed to handle Val.
 typedef bool CCAssignFn(unsigned ValNo, EVT ValVT,
                         EVT LocVT, CCValAssign::LocInfo LocInfo,
                         ISD::ArgFlagsTy ArgFlags, CCState &State);
@@ -275,6 +275,12 @@ public:
     return Result;
   }
 
+  /// Version of AllocateStack with extra register to be shadowed.
+  unsigned AllocateStack(unsigned Size, unsigned Align, unsigned ShadowReg) {
+    MarkAllocated(ShadowReg);
+    return AllocateStack(Size, Align);
+  }
+
   // HandleByVal - Allocate a stack slot large enough to pass an argument by
   // value. The size and alignment information of the argument is encoded in its
   // parameter attribute.