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Re: Problem with reloading in a new backend...
Le mercredi 09 avril 2008 Ã 12:41 -0400, DJ Delorie a Ãcrit :
> > switch (which_alternative) {
> > case 0: /* register to register */
>
> Better to just use the @ syntax that gcc offers, to provide multiple
> patterns:
>
> "@
> tfr %0,%1
> ldih %0, hi(%1); ldil %0, lo(%1)
> ldih %0, hi(%1); ldil %0, lo(%1)
> st %1,(%0)
> ld %0,(%1)"
>
> Everything else should have been sorted out by the constraints.
Right.
> > This seems to work ok, but I still have issues at reload time, because
> > of the base register addressing mode: in the reload pass gcc generates
> > moves from/to the stack:
>
> You might need to define LEGITIMIZE_RELOAD_ADDRESS, or at least
> LEGITIMIZE_ADDRESS. I don't know if reload has assumptions about such
> offsets, but the m32c port has a limit on the offset range so it might
> help you figure out your port.
Ah, this looks exactly like what I needed, thanks!
I'll try this and come back afterwards.
--
Stelian Pop <stelian@popies.net>