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 16BB63857719; Sat,  3 Jun 2023 00:09:51 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 16BB63857719
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1685750991;
	bh=hP7K7qlt0y4rFfPIEKBcY2x0Y6rju/lEzd1x9lnWWsE=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=VEaFgOXxxpU8Gd823yxD+rf85Q7wrD/9mMqVKWR0fqWiXAtoY7j9NeEBWwLLsbusW
	 EhzAEJeiqAvMnnas8DriJz4Kcjifu6YDHH8G867tuSgKIvrasNG93KY+vBEkWZVdp0
	 5aZWwTv75yOhVJq3OJwEpZy+xu4sk5jP1UZ4Agr0=
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110067] [14 Regression] Wrong code on
 pixman-0.42.2
Date: Sat, 03 Jun 2023 00:09:48 +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: needs-bisection, wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P1
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 14.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-110067-4-zaDBRbXEHI@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-110067-4@http.gcc.gnu.org/bugzilla/>
References: <bug-110067-4@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=3D110067

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:

https://gcc.gnu.org/g:57b30f0134d9b49f7707b0c2ded6fd7686a312c8

commit r14-1510-g57b30f0134d9b49f7707b0c2ded6fd7686a312c8
Author: liuhongt <hongtao.liu@intel.com>
Date:   Thu Jun 1 12:11:24 2023 +0800

    Don't try bswap + rotate when TYPE_PRECISION(n->type) > n->range.

    For the testcase in the PR, we have

      br64 =3D br;
      br64 =3D ((br64 << 16) & 0x000000ff00000000ull) | (br64 & 0x0000ff00u=
ll);

      n->n: 0x3000000200.
      n->range: 32.
      n->type: uint64.

    The original code assumes n->range is same as TYPE PRECISION(n->type),
    and tries to rotate the mask from 0x300000200 -> 0x20300 which is
    incorrect. The patch fixed this bug by not trying bswap + rotate when
    TYPE_PRECISION(n->type) is not equal to n->range.

    gcc/ChangeLog:

            PR tree-optimization/110067
            * gimple-ssa-store-merging.cc (find_bswap_or_nop): Don't try
            bswap + rotate when TYPE_PRECISION(n->type) > n->range.

    gcc/testsuite/ChangeLog:

            * gcc.target/i386/pr110067.c: New test.=