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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/105629] [13 Regression] g++.dg/opt/pr94589-2.C for
 cris, m68k, s390x
Date: Fri, 20 May 2022 06:07:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105629

--- Comment #2 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 19 May 2022, hp at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105629
>=20
> Hans-Peter Nilsson <hp at gcc dot gnu.org> changed:
>=20
>            What    |Removed                     |Added
> -------------------------------------------------------------------------=
---
>                  CC|                            |rguenth at gcc dot gnu.o=
rg
>=20
> --- Comment #1 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
> It's r13-204-g93416de0cb7235, "Remove GIMPLE restriction of ! using match=
.pd
> patterns".  A brief look at the diff of the assembly between that and tha=
t^
> indicates a code quality regression.

I wonder if you can help and "bisect" the actual pattern that is now
enabled for GENERIC folding?  The testcase is about spaceship optimization
and the matching done in forwprop might be quite specific and in the need
of a slight adjustment.=