[PATCH 2/8] [RS6000] rs6000_rtx_costs for AND

[Alan Modra]

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.  */

-- 
Alan Modra
Australia Development Lab, IBM