Re: [PATCH v3 1/2]middle-end: expand copysign handling from lockstep to nested iters

[Richard Biener <rguenther@suse.de>]

On Mon, 6 Nov 2023, Tamar Christina wrote:

> Hi All,
> 
> various optimizations in match.pd only happened on COPYSIGN in lock step
> which means they exclude IFN_COPYSIGN.  COPYSIGN however is restricted to only
> the C99 builtins and so doesn't work for vectors.
> 
> The patch expands these optimizations to work as nested iters.
> 
> This is needed for the second patch which will add the testcase.
> 
> Bootstrapped Regtested on aarch64-none-linux-gnu and no issues.
> 
> Ok for master?

OK.

> Thanks,
> Tamar
> 
> gcc/ChangeLog:
> 
> 	PR tree-optimization/109154
> 	* match.pd: expand existing copysign optimizations.
> 
> --- inline copy of patch -- 
> diff --git a/gcc/match.pd b/gcc/match.pd
> index 7d651a6582d169793cca4f9a70e334dd80014d92..db95931df0672cf4ef08cca36085c3aa6831519e 100644
> --- a/gcc/match.pd
> +++ b/gcc/match.pd
> @@ -1074,37 +1074,37 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
>  
>  /* cos(copysign(x, y)) -> cos(x).  Similarly for cosh.  */
>  (for coss (COS COSH)
> -     copysigns (COPYSIGN)
> - (simplify
> -  (coss (copysigns @0 @1))
> -   (coss @0)))
> + (for copysigns (COPYSIGN)
> +  (simplify
> +   (coss (copysigns @0 @1))
> +    (coss @0))))
>  
>  /* pow(copysign(x, y), z) -> pow(x, z) if z is an even integer.  */
>  (for pows (POW)
> -     copysigns (COPYSIGN)
> - (simplify
> -  (pows (copysigns @0 @2) REAL_CST@1)
> -  (with { HOST_WIDE_INT n; }
> -   (if (real_isinteger (&TREE_REAL_CST (@1), &n) && (n & 1) == 0)
> -    (pows @0 @1)))))
> + (for copysigns (COPYSIGN)
> +  (simplify
> +   (pows (copysigns @0 @2) REAL_CST@1)
> +   (with { HOST_WIDE_INT n; }
> +    (if (real_isinteger (&TREE_REAL_CST (@1), &n) && (n & 1) == 0)
> +     (pows @0 @1))))))
>  /* Likewise for powi.  */
>  (for pows (POWI)
> -     copysigns (COPYSIGN)
> - (simplify
> -  (pows (copysigns @0 @2) INTEGER_CST@1)
> -  (if ((wi::to_wide (@1) & 1) == 0)
> -   (pows @0 @1))))
> + (for copysigns (COPYSIGN)
> +  (simplify
> +   (pows (copysigns @0 @2) INTEGER_CST@1)
> +   (if ((wi::to_wide (@1) & 1) == 0)
> +    (pows @0 @1)))))
>  
>  (for hypots (HYPOT)
> -     copysigns (COPYSIGN)
> - /* hypot(copysign(x, y), z) -> hypot(x, z).  */
> - (simplify
> -  (hypots (copysigns @0 @1) @2)
> -  (hypots @0 @2))
> - /* hypot(x, copysign(y, z)) -> hypot(x, y).  */
> - (simplify
> -  (hypots @0 (copysigns @1 @2))
> -  (hypots @0 @1)))
> + (for copysigns (COPYSIGN)
> +  /* hypot(copysign(x, y), z) -> hypot(x, z).  */
> +  (simplify
> +   (hypots (copysigns @0 @1) @2)
> +   (hypots @0 @2))
> +  /* hypot(x, copysign(y, z)) -> hypot(x, y).  */
> +  (simplify
> +   (hypots @0 (copysigns @1 @2))
> +   (hypots @0 @1))))
>  
>  /* copysign(x, CST) -> [-]abs (x).  */
>  (for copysigns (COPYSIGN_ALL)
> 
> 
> 
> 
> 

-- 
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)