Re: [mn10300] return-in-a0-d0 ABI helper

[Jeffrey A Law <law at redhat dot com>]

On Fri, 2005-09-09 at 20:51 -0400, DJ Delorie wrote:
> > (1) Use EPILOGUE_USES to force d0 live at the end of the function,
> >     and emit the copy by hand.
> 
> I tried that first.  It upsets the register allocator.
> 
> > (2) Make FUNCTION_VALUE return a PARALLEL that copies the data into
> >     both registers.
> 
> Didn't think of that, but I'm guessing it would also upset the
> register allocator.  And probably make callers *depend* on the return
> value being in either register.
This situation is precisely why we support PARALLELs for return
values (the need to return a value in multiple registers).

It ought to "just work".

jeff