Hi Jakub,
on 2023/11/25 18:17, Jakub Jelinek wrote:
> Hi!
>
> The middle-end has been changed quite recently to canonicalize
> -abs (x) to copysign (x, -1) rather than the other way around.
> While I agree with that at GIMPLE level, since it matches the GIMPLE
> goal of as few operations as
> -Original Message-
> From: Jakub Jelinek
> Sent: Monday, November 27, 2023 8:13 AM
> To: Tamar Christina
> Cc: Xi Ruoyao ; Segher Boessenkool
> ; David Edelsohn ; gcc-
> patc...@gcc.gnu.org; Andrew Pinski
> Subject: Re: [PATCH] rs6000: Canonicalize copysign
On Mon, Nov 27, 2023 at 07:55:52AM +, Tamar Christina wrote:
> > For POPCOUNT I've introduced recently a way to provide custom expand_*
> > function and decide there what optimizations to use, even when it otherwise
> > is an integral unary optab ifn.
> >
>
> Oh that sounds interesting, do
> On Sat, Nov 25, 2023 at 12:03:56PM +, Tamar Christina wrote:
> > For the C99 versions of copysign, expand_COPYSIGN has optimized
> expansions inplace.
> > One of the hooks there forces it to abs/neg. There is also code in
> > place for if the target prefers integer expansion over floating
On Sat, Nov 25, 2023 at 12:03:56PM +, Tamar Christina wrote:
> For the C99 versions of copysign, expand_COPYSIGN has optimized expansions
> inplace.
> One of the hooks there forces it to abs/neg. There is also code in place
> for if the target
> prefers integer expansion over floating
> -Original Message-
> From: Xi Ruoyao
> Sent: Saturday, November 25, 2023 10:43 AM
> To: Jakub Jelinek ; Segher Boessenkool
> ; David Edelsohn
> Cc: gcc-patches@gcc.gnu.org; Tamar Christina ;
> Andrew Pinski
> Subject: Re: [PATCH] rs6000: Canonicalize copysign
On Sat, 2023-11-25 at 11:17 +0100, Jakub Jelinek wrote:
> The middle-end has been changed quite recently to canonicalize
> -abs (x) to copysign (x, -1) rather than the other way around.
> While I agree with that at GIMPLE level, since it matches the GIMPLE
> goal of as few operations as possible
