Re: [PATCH] MATCH: Optimize COND_ADD reduction pattern

[Richard Biener <rguenther@suse.de>]

On Tue, 26 Sep 2023, Juzhe-Zhong wrote:

> Current COND_ADD reduction pattern can't optimize floating-point vector.
> As Richard suggested: https://gcc.gnu.org/pipermail/gcc-patches/2023-September/631336.html
> Allow COND_ADD reduction pattern to optimize floating-point vector.
> 
> Bootstrap and Regression is running.
> 
> Ok for trunk if tests pass ?

I just wondered about fixed point - zerop seems to also allow
fixed_zerop.  Maybe do

 if (ANY_INTEGRAL_TYPE_P (type)
     || (FLOAT_TYPE_P (type)
         && fold_real_zero_addition_p (type, NULL_TREE, @4, 0)))

(also for the other patch) to avoid touching the fixed point case.

Richard.

> gcc/ChangeLog:
> 
> 	* match.pd: Optimize COND_ADD reduction pattern.
> 
> ---
>  gcc/match.pd | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/gcc/match.pd b/gcc/match.pd
> index 5061c19e086..398beaebd27 100644
> --- a/gcc/match.pd
> +++ b/gcc/match.pd
> @@ -8863,8 +8863,10 @@ and,
>  
>     c = mask1 && mask2 ? d + b : d.  */
>  (simplify
> -  (IFN_COND_ADD @0 @1 (vec_cond @2 @3 integer_zerop) @1)
> -   (IFN_COND_ADD (bit_and @0 @2) @1 @3 @1))
> +  (IFN_COND_ADD @0 @1 (vec_cond @2 @3 zerop@4) @1)
> +   (if (ANY_INTEGRAL_TYPE_P (type)
> +	|| fold_real_zero_addition_p (type, NULL_TREE, @4, 0))
> +   (IFN_COND_ADD (bit_and @0 @2) @1 @3 @1)))
>  
>  /* Detect simplication for a conditional length reduction where
>  
> 

-- 
Richard Biener <rguenther@suse.de>
SUSE Software Solutions Germany GmbH,
Frankenstrasse 146, 90461 Nuernberg, Germany;
GF: Ivo Totev, Andrew McDonald, Werner Knoblich; (HRB 36809, AG Nuernberg)