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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/111401] Middle-end: Missed optimization of
 MASK_LEN_FOLD_LEFT_PLUS
Date: Thu, 14 Sep 2023 06:51:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111401

--- Comment #5 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 13 Sep 2023, rdapp at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111401
>=20
> --- Comment #3 from Robin Dapp <rdapp at gcc dot gnu.org> ---
> Several other things came up, so I'm just going to post the latest status=
 here
> without having revised or tested it.  Going to try fixing it and testing
> tomorrow.

I think what's important to do is make sure targets without
masking are still getting the cond-reduction code generation
(but with the signed-zero issue fixed).  Using a cond_add is
probably better than the vec_cond + add even for the not
fold-left reduction case.=