Good spot!
"Steve Ellcey " <[email protected]> writes:
> diff --git a/gcc/config/mips/mips.c b/gcc/config/mips/mips.c
> index 5993aab..ffb0b53 100644
> --- a/gcc/config/mips/mips.c
> +++ b/gcc/config/mips/mips.c
> @@ -3796,6 +3796,18 @@ mips_rtx_costs (rtx x, int code, int outer_code, int
> opno ATTRIBUTE_UNUSED,
> return true;
> }
> }
> + /* (AND (NOT op0) (NOT op1) is a nor operation that can be done in
> + a single instruction. */
> + if (!TARGET_MIPS16 && (GET_CODE (XEXP (x, 0)) == NOT)
> + && (GET_CODE (XEXP (x, 1)) == NOT))
> + {
> + rtx op0 = XEXP (x, 0);
> + rtx op1 = XEXP (x, 1);
> + cost = GET_MODE_SIZE (mode) > UNITS_PER_WORD ? 2 : 1;
> + *total = COSTS_N_INSNS (cost) + set_src_cost (XEXP (op0, 0), speed)
> + + rtx_cost (XEXP (op1, 0), GET_CODE (op1), 1, speed);
> + return true;
> + }
We should use set_src_cost for both operands (the idea being that only
a register is allowed, and that anything else will end up being a SET_SRC).
I think the formatting should be something like:
/* (AND (NOT op0) (NOT op1)) is a NOR operation that can be done in
a single instruction. */
if (!TARGET_MIPS16
&& GET_CODE (XEXP (x, 0)) == NOT
&& GET_CODE (XEXP (x, 1)) == NOT)
{
cost = GET_MODE_SIZE (mode) > UNITS_PER_WORD ? 2 : 1;
*total = (COSTS_N_INSNS (cost)
+ set_src_cost (XEXP (XEXP (x, 0), 0), speed)
+ set_src_cost (XEXP (XEXP (x, 1), 0), speed));
return true;
}
OK with that change, thanks.
Richard
