Re: [sdcc-devel] Register allocation in MCS51

[Philipp K. K. <pk...@sp...>]

Am 09.07.24 um 16:07 schrieb Steve Schnepp:
> What does "flexible calling convention in the compiler" mean ?
> Not saying practical, but would it be doable to have a fully flexible
> calling convention ?
>
> something akin to
>
> __reg(a) char my_add( __reg(a) char first, __reg(r0) char second) {
>     return first + second;
> }

AFAIR, there was a similar discussion when we worked on calling
conventions for z80. Since the calling convention does not make a
difference inthe abstract machine, it would probably be a good idea to
use C23 attributes instead of inventing new syntax.
But for that we'd need to improve our support of C23 attributes in the
frontend first.

Philipp