From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id ACE82385842D; Thu, 13 Jul 2023 14:55:19 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org ACE82385842D
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1689260119;
	bh=i6lnXBnwsTzrskRk5Rj+PGEcjLVQwvq55yqOhMZ//M8=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=Dyv/q3TSwzV4yc5E3yp30DnIsPFOdWai7AiBn58BZEhcW+s8GOXwxZfkz2Zl0vZpw
	 bQdHqHlfSoTyxUtOzfGZRVJqlq7Nbk296193m24joqpixkvrZ7ySwTrEgosGE/9u7P
	 Z8UfFC6HeAW7shMI2KOXDxs2GaUnBUN7SDa07WOo=
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110539] [14 Regression] Dead Code Elimination
 Regression at since r14-338-g1dd154f6407
Date: Thu, 13 Jul 2023 14:55:18 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization, patch
X-Bugzilla-Severity: normal
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: pinskia at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 14.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-110539-4-3AsnK0vySL@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-110539-4@http.gcc.gnu.org/bugzilla/>
References: <bug-110539-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110539

--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Andrew Pinski <pinskia@gcc.gnu.org>:

https://gcc.gnu.org/g:285c9d042e90a7425b37697edc9ec93a1b03b486

commit r14-2501-g285c9d042e90a7425b37697edc9ec93a1b03b486
Author: Andrew Pinski <apinski@marvell.com>
Date:   Wed Jul 12 00:33:14 2023 -0700

    Fix part of PR 110293: `A NEEQ (A NEEQ CST)` part

    This fixes part of PR 110293, for the outer comparison case
    being `!=3D` or `=3D=3D`.  In turn PR 110539 is able to be optimized
    again as the if statement for `(a&1) =3D=3D ((a & 1) !=3D 0)` gets opti=
mized
    to `false` early enough to allow FRE/DOM to do a CSE for memory store/l=
oad.

    OK? Bootstrapped and tested on x86_64-linux with no regressions.

    gcc/ChangeLog:

            PR tree-optimization/110293
            PR tree-optimization/110539
            * match.pd: Expand the `x !=3D (typeof x)(x =3D=3D 0)`
            pattern to handle where the inner and outer comparsions
            are either `!=3D` or `=3D=3D` and handle other constants
            than 0.

    gcc/testsuite/ChangeLog:

            * gcc.dg/tree-ssa/pr110293-1.c: New test.
            * gcc.dg/tree-ssa/pr110539-1.c: New test.
            * gcc.dg/tree-ssa/pr110539-2.c: New test.
            * gcc.dg/tree-ssa/pr110539-3.c: New test.
            * gcc.dg/tree-ssa/pr110539-4.c: New test.=