Re: compile-rtl, II

[Stefan Israelsson Tampe <stefan.itampe@gmail.com>]

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On Mon, Jan 21, 2013 at 6:39 PM, Andy Wingo <wingo@pobox.com> wrote:

> On Mon 15 Oct 2012 16:05, Stefan Israelsson Tampe <stefan.itampe@gmail.com>
> writes:
>
> > (arg1, return-address, old-frame, program, arg2 ...)
> >
> > This way we do not need to copy the program field at a tail call
>
> What would you do for 0 arguments?
>
> I would just fill in the first argument with SCM_UNSPECIFIED or such and
send information to the call that
0 argumnets is filled in, then the compiled code would work smartly and use
this field for normal rtl registers.
Ayway I did not pursue this at date more than adding some flags to the
compiler so that we can turn on this
feature and try it out later.


> > Also another kind of difficulty will arise, many instructions only
> > take a value of 256 register positions
>
> Do you have examples?  I think the idea I had in mind was to reserve the
> last two or three of the 8-bit-addressable registers as temporaries, and
> emit long-mov shuffles to handle those cases.
>
> To be frank it looks like 95% of the code will never need to think about
this issue, so your approach seams sane.


> Andy
> --
> http://wingolog.org/
>

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