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 553A2388F045; Fri,  5 Jun 2020 08:45:05 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 553A2388F045
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1591346705;
 bh=CDTos7CBvQMPY9iqzOyYfxOIJsZLzdv3P0OtEDMxYu4=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=Q8HZUo1ZQklyK8kutTtMckRTf9bgD87E+hAtvEdlX+Qn7cWg9zAgWBF47hku262Hx
 s95YnwqMO6ZYZvonqoFtsDx78A5wgN/tBqWJM9/UXqKcZFibn2Au7nJL4f2oQmVYTc
 8sy7hfWmV1sRmi36lP2f5ZbfyzVu4dlR5w8vSa0k=
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/95535] Failure to optimize out cdqe after __bultin_ctz
Date: Fri, 05 Jun 2020 08:45:05 +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
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: jakub at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-95535-4-3gsKGxhUxZ@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-95535-4@http.gcc.gnu.org/bugzilla/>
References: <bug-95535-4@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: <http://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: <http://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Fri, 05 Jun 2020 08:45:05 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95535

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

https://gcc.gnu.org/g:892b51cb73f24157391cd18c2215e8d703af97e7

commit r11-965-g892b51cb73f24157391cd18c2215e8d703af97e7
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Fri Jun 5 10:44:23 2020 +0200

    ix86: Improve __builtin_c[lt]z followed by extension [PR95535]

    In January I've added patterns to optimize SImode -> DImode sign or zero
    extension of __builtin_popcount, this patch does the same for
    __builtin_c[lt]z.  Like most other instructions, the [tl]zcntl instruct=
ions
    clear the upper 32 bits of the destination register and as the instruct=
ions
    only result in values 0 to 32 inclusive, both sign and zero extensions
    behave the same.

    2020-06-05  Jakub Jelinek  <jakub@redhat.com>

            PR target/95535
            * config/i386/i386.md (*ctzsi2_zext, *clzsi2_lzcnt_zext): New
            define_insn_and_split patterns.
            (*ctzsi2_zext_falsedep, *clzsi2_lzcnt_zext_falsedep): New
            define_insn patterns.

            * gcc.target/i386/pr95535-1.c: New test.
            * gcc.target/i386/pr95535-2.c: New test.=