From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id B43E43858C53; Thu, 25 Jan 2024 11:38:11 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org B43E43858C53 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1706182691; bh=lNeIcU5037xkE/WBOZwSa/AcA2HCFIN28+XJchjztrg=; h=From:To:Subject:Date:In-Reply-To:References:From; b=HpMHRY+3/0ln88pwIgR8lFvAwwARMIngWNFsZ+MQYERpJul5Wc4Vf1ah74PeIc6VI W/YxfJlfxjOvcYT7mIZExIIb3l2N9VBayI63WrRgc/SBy2mn3rtjwGYg7Q0Z1uNpBJ LDTgSOD2DksOAdq+3BHkH7xXsi9igcHQ5AeXRr4k= From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/113597] [14 Regression] aarch64: Significant code quality regression since r14-8346-ga98d5130a6dcff Date: Thu, 25 Jan 2024 11:38:11 +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: 14.0 X-Bugzilla-Keywords: alias, missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org X-Bugzilla-Target-Milestone: 14.0 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113597 --- Comment #8 from Andrew Pinski --- (In reply to Alex Coplan from comment #7) > I expect the store pairs come from memcpy lowering/expansion in the aarch= 64 > backend, that is the only way we get store pairs so early in the RTL > pipeline IIRC. In this case, memset is more likely.=20=20 Either: for (int i =3D 0; i < j; i++) m[i] =3D vdupq_n_f32(0.F); Or for (int i =3D 0; i < l; i++) n[i] =3D vdupq_n_f32(0.F);=