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 D0A0E3858438; Mon, 22 Nov 2021 18:17:31 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D0A0E3858438
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103345] missed optimization: add/xor
 individual bytes to form a word
Date: Mon, 22 Nov 2021 18:17:31 +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: 12.0
X-Bugzilla-Keywords: missed-optimization
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: roger at nextmovesoftware dot com
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-103345-4-LX3U24JZo2@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-103345-4@http.gcc.gnu.org/bugzilla/>
References: <bug-103345-4@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
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 22 Nov 2021 18:17:31 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103345

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Roger Sayle <sayle@gcc.gnu.org>:

https://gcc.gnu.org/g:a944b5dec3adb28ed199234d2116145ca9010d6a

commit r12-5453-ga944b5dec3adb28ed199234d2116145ca9010d6a
Author: Roger Sayle <roger@nextmovesoftware.com>
Date:   Mon Nov 22 18:15:36 2021 +0000

    tree-optimization/103345: Improved load merging.

    This patch implements PR tree-optimization/103345 to merge adjacent
    loads when combined with addition or bitwise xor.  The current code
    in gimple-ssa-store-merging.c's find_bswap_or_nop alreay handles ior,
    so that all that's required is to treat PLUS_EXPR and BIT_XOR_EXPR in
    the same way at BIT_IOR_EXPR.  Many thanks to Andrew Pinski for
    pointing out that this also resolves PR target/98953.

    2021-11-22  Roger Sayle  <roger@nextmovesoftware.com>

    gcc/ChangeLog
            PR tree-optimization/98953
            PR tree-optimization/103345
            * gimple-ssa-store-merging.c (find_bswap_or_nop_1): Handle
            BIT_XOR_EXPR and PLUS_EXPR the same as BIT_IOR_EXPR.
            (pass_optimize_bswap::execute): Likewise.

    gcc/testsuite/ChangeLog
            PR tree-optimization/98953
            PR tree-optimization/103345
            * gcc.dg/tree-ssa/pr98953.c: New test case.
            * gcc.dg/tree-ssa/pr103345.c: New test case.=