On Thu, 22 Oct 2020, Alan Modra via Gcc-patches wrote:
Hi!
> On Wed, Oct 21, 2020 at 03:29:11PM -0500, Segher Boessenkool wrote:
> > Anyway:
> >
> > + || (outer_code == AND
> > + && rs6000_is_valid_2insn_and (x, mode)))
> > {
> > *total = COSTS_N_INSNS (1);
> > return true;
> >
> > It should return COSTS_N_INSNS (2) for that?
>
> No, it should not!
>
> /* (reg) is costed at zero by rtlanal.c:rtx_cost. That sets a
> baseline for rtx costs: If a constant is valid in an insn,
> it is free. */
>From where is this quote? My "git grep" fails to find it for me
(on master). It seems like a port-specific commment so I'd
have expected to find it somewhere in config/rs6000.
brgds, H-P
