Richard Biener <rguent...@suse.de> writes:
> The following retires vcond{,u,eq} optabs by stopping to use them
> from the middle-end. Targets instead (should) implement vcond_mask
> and vec_cmp{,u,eq} optabs. The PR this change refers to lists
> possibly affected targets - those implementing these patterns,
> and in particular it lists mips, sparc and ia64 as targets that
> most definitely will regress while others might simply remove
> their vcond{,u,eq} patterns.
>
> I'd appreciate testing, I do not expect fallout for x86 or arm/aarch64.
> I know riscv doesn't implement any of the legacy optabs. But less
> maintained vector targets might need adjustments.
>
> I want to get rid of those optabs for GCC 15. If I don't hear from
> you I will assume your target is fine.
Great! Thanks for doing this.
Is there a plan for how we should handle vector comparisons that
have to be done as the inverse of the negated condition? Should
targets simply not provide vec_cmp for such conditions and leave
the target-independent code to deal with the fallout? (For a
standalone comparison, it would invert the result. For a VEC_COND_EXPR
it would swap the true and false values.)
Richard
>
> Thanks,
> Richard.
>
> PR middle-end/114189
> * optabs-query.h (get_vcond_icode): Always return CODE_FOR_nothing.
> (get_vcond_eq_icode): Likewise.
> ---
> gcc/optabs-query.h | 13 ++++---------
> 1 file changed, 4 insertions(+), 9 deletions(-)
>
> diff --git a/gcc/optabs-query.h b/gcc/optabs-query.h
> index 0cb2c21ba85..31fbce80175 100644
> --- a/gcc/optabs-query.h
> +++ b/gcc/optabs-query.h
> @@ -112,14 +112,9 @@ get_vec_cmp_eq_icode (machine_mode vmode, machine_mode
> mask_mode)
> mode CMODE, unsigned if UNS is true, resulting in a value of mode VMODE.
> */
>
> inline enum insn_code
> -get_vcond_icode (machine_mode vmode, machine_mode cmode, bool uns)
> +get_vcond_icode (machine_mode, machine_mode, bool)
> {
> - enum insn_code icode = CODE_FOR_nothing;
> - if (uns)
> - icode = convert_optab_handler (vcondu_optab, vmode, cmode);
> - else
> - icode = convert_optab_handler (vcond_optab, vmode, cmode);
> - return icode;
> + return CODE_FOR_nothing;
> }
>
> /* Return insn code for a conditional operator with a mask mode
> @@ -135,9 +130,9 @@ get_vcond_mask_icode (machine_mode vmode, machine_mode
> mmode)
> mode CMODE (only EQ/NE), resulting in a value of mode VMODE. */
>
> inline enum insn_code
> -get_vcond_eq_icode (machine_mode vmode, machine_mode cmode)
> +get_vcond_eq_icode (machine_mode, machine_mode)
> {
> - return convert_optab_handler (vcondeq_optab, vmode, cmode);
> + return CODE_FOR_nothing;
> }
>
> /* Enumerates the possible extraction_insn operations. */
