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 2EC5B388E80C; Tue, 11 May 2021 15:15:59 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2EC5B388E80C
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/99988] aarch64: GCC generates excessive consecutive bti
 j instructions
Date: Tue, 11 May 2021 15:15:58 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 11.0
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: acoplan at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-99988-4-6HahUEgDFg@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-99988-4@http.gcc.gnu.org/bugzilla/>
References: <bug-99988-4@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: Tue, 11 May 2021 15:15:59 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99988

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Alex Coplan
<acoplan@gcc.gnu.org>:

https://gcc.gnu.org/g:1011bb8bc67cf34c45a9237d72a801a14ad9ef0f

commit r11-8379-g1011bb8bc67cf34c45a9237d72a801a14ad9ef0f
Author: Alex Coplan <alex.coplan@arm.com>
Date:   Wed Apr 21 14:42:04 2021 +0100

    aarch64: Avoid duplicating bti j insns for jump tables [PR99988]

    This patch fixes PR99988 which shows us generating large (> 250)
    sequences of back-to-back bti j instructions.

    The fix is simply to avoid inserting bti j instructions at the target of
    a jump table if we've already inserted one for a given label.

    Co-Authored-By: Christophe Lyon <clyon@gcc.gnu.org>

    gcc/ChangeLog:

            PR target/99988
            * config/aarch64/aarch64-bti-insert.c (aarch64_bti_j_insn_p): N=
ew.
            (rest_of_insert_bti): Avoid inserting duplicate bti j insns for
            jump table targets.

    gcc/testsuite/ChangeLog:

            PR target/99988
            * gcc.target/aarch64/pr99988.c: New test.=