ARM: Change code generation for function return...

src/arm/virtual-frame-arm.h

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 194 matching lines @@
     AssertIsSpilled();
   }
 
   // Emit code for the physical JS entry and exit frame sequences.  After
   // calling Enter, the virtual frame is ready for use; and after calling
   // Exit it should not be used.  Note that Enter does not allocate space in
   // the physical frame for storing frame-allocated locals.
   void Enter();
   void Exit();
 
-  // Prepare for returning from the frame by spilling locals and
-  // dropping all non-locals elements in the virtual frame.  This
+  // Prepare for returning from the frame by elements in the virtual frame. This
   // avoids generating unnecessary merge code when jumping to the
-  // shared return site.  Emits code for spills.
+  // shared return site. No spill code emitted. Value to return should be in r0.
   inline void PrepareForReturn();
 
   // Number of local variables after when we use a loop for allocating.
   static const int kLocalVarBound = 5;
 
   // Allocate and initialize the frame-allocated locals.
   void AllocateStackSlots();
 
   // The current top of the expression stack as an assembly operand.
   MemOperand Top() {
@@ skipping 273 matching lines @@
     }
   }
 
   friend class JumpTarget;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_VIRTUAL_FRAME_ARM_H_