Andrew J Bromage <[EMAIL PROTECTED]> writes:
> G'day all.
>
> On Fri, Apr 26, 2002 at 08:16:27AM -0400, Melvin Smith wrote:
>
>> I also vote for reserving some caller-save registers to make
>> arg passing faster, however, reserving 16 is probably useless, except
>> for symmetry.
>>
>> I think most texts agree that 5 or so are about all you need.
>
> Fair enough. In that case, in the interests of using round numbers,
> I vote for X0-X7 to be for argument passing and, in the event that
> they're not actually used for argument passing, caller-save.
I'm trying to see how, if you want genuine continuations and/or tail
call optimization, you're going to get away with anything but 'caller
saves everything important to it', and what do you know, I
can't. A decent compiler will obviously optimize away some of the
saving of 'extras' for relatively simple subroutine calls, but at the
limit you're going to need to presave everything surely.
--
Piers
"It is a truth universally acknowledged that a language in
possession of a rich syntax must be in need of a rewrite."
-- Jane Austen?
