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From: "aldyh at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107009] [13 Regression] massive unnecessary
 code blowup in vectorizer
Date: Thu, 22 Sep 2022 20:03:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107009

--- Comment #2 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #1)
> Looks like it was caused by r13-1268-g8c99e307b20c50:
>=20
> commit 8c99e307b20c502e55c425897fb3884ba8f05882
> Author: Aldy Hernandez <aldyh@redhat.com>
> Date:   Sat Jun 25 18:58:02 2022 -0400
>=20
>     Convert DOM to use Ranger rather than EVRP

Note that this patch is usually a red herring. It makes DOM smarter by
improving its copy propagation and threading capabilities. And when DOM is
done, it will export whatever global ranges it discovered to other passes. =
Any
number of these things could cause the vectorizer to make different decisio=
ns.

I'll take a look tomorrow though.=