From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id D7EA9383E835; Wed, 22 Jul 2020 07:23:24 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D7EA9383E835 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1595402604; bh=35lV/My144NSIFscTJSx4ZAmBraanr307sTYU6E+uyA=; h=From:To:Subject:Date:In-Reply-To:References:From; b=pwbGLJFdH4qu685X/UajueeRWs7edyWbEotpBOV+yZ2XM+2MAJ6WA5YiwK53reWpu TG5b0v/VMj2I5tMpQ0tMZcQQhWJ1DhNwHAECzfOWtDStEVdhP2mn2lsHrO3IesmFeD DctRpFr8SQGCI0izmArhdJQGCpiWYHbtQXUD7aYc= From: "crazylht at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/96271] Failure to optimize memcmp of doubles to avoid going through memory Date: Wed, 22 Jul 2020 07:23:24 +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: crazylht at gmail dot com 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: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc 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, 22 Jul 2020 07:23:25 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96271 Hongtao.liu changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |crazylht at gmail dot com --- Comment #3 from Hongtao.liu --- in for testcase.c.267r.dse1 pass_dse1 fail to delete --- trying to replace DImode load in insn 7 from DFmode store in insn 2 -- could not extract bits of stored value trying to replace DImode load in insn 8 from DFmode store in insn 3 -- could not extract bits of stored value ... (insn 2 5 3 2 (set (mem/c:DF (plus:DI (reg/f:DI 19 frame) (const_int -8 [0xfffffffffffffff8])) [1 a+0 S8 A64]) (reg:DF 20 xmm0 [ a ])) "pr96271_double.c":4:1 135 {*movdf_internal} (expr_list:REG_DEAD (reg:DF 20 xmm0 [ a ]) ... (insn 7 4 8 2 (set (reg:DI 87 [ MEM [(char * {ref-all})&a] = ]) (mem/c:DI (plus:DI (reg/f:DI 19 frame) (const_int -8 [0xfffffffffffffff8])) [0 MEM [(char * {ref-all})&a]+0 S8 A64])) "pr96271_double.c":5:37 74 {*movdi_inter= nal} (nil)) ... --- Shouldn't DImode load behave the same with DFmode load?=