From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 6D6D53858C78; Thu, 27 Jan 2022 08:13:05 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 6D6D53858C78 From: "crazylht at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/102178] [12 Regression] SPECFP 2006 470.lbm regressions on AMD Zen CPUs after r12-897-gde56f95afaaa22 Date: Thu, 27 Jan 2022 08:13:04 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: rtl-optimization X-Bugzilla-Version: 12.0 X-Bugzilla-Keywords: missed-optimization, ra X-Bugzilla-Severity: normal X-Bugzilla-Who: crazylht at gmail dot com 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: 12.0 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: 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: Thu, 27 Jan 2022 08:13:05 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102178 --- Comment #9 from Hongtao.liu --- 1703 : 401cb1: vmovq %xmm1,%r9 (*) 834 : 401cb6: vmovq %r8,%xmm1 1719 : 401cbb: vmovq %r9,%xmm0 (*) Look like %r9 is dead after the second (*), and it can be optimized to 1703 : 401cb1: vmovq %xmm1,%xmm0 834 : 401cb6: vmovq %r8,%xmm1=