From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 7C99C3858403; Wed, 13 Oct 2021 21:25:19 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7C99C3858403 From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/102737] [9/10/11/12 Regression] extra mov with int->double conversion and addition (incoming arguments and return) Date: Wed, 13 Oct 2021 21:25:19 +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: 12.0 X-Bugzilla-Keywords: missed-optimization, ra X-Bugzilla-Severity: enhancement X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 9.5 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: target_milestone cf_known_to_fail bug_severity cf_known_to_work short_desc Message-ID: In-Reply-To: References: 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Oct 2021 21:25:19 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102737 Andrew Pinski changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|--- |9.5 Known to fail| |10.1.0, 9.1.0 Severity|normal |enhancement Known to work| |5.1.0, 8.1.0, 8.5.0 Summary|[x86] Failure to optimize |[9/10/11/12 Regression] |out bad register usage |extra mov with int->double |involving int->double |conversion and addition |conversion |(incoming arguments and | |return) --- Comment #1 from Andrew Pinski --- GCC 8.5.0 (and before) would do: pxor %xmm1, %xmm1 cvtsi2sd %edi, %xmm1 addsd %xmm1, %xmm0 ret So this is a regression. Even with AVX, gcc has an extra move even if inputs don't have to be tied to the output: vmovsd %xmm0, %xmm0, %xmm1 vxorps %xmm0, %xmm0, %xmm0 vcvtsi2sdl %edi, %xmm0, %xmm0 vaddsd %xmm1, %xmm0, %xmm0 ret=