From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 53B8B3858C33; Thu, 20 Jul 2023 08:53:06 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 53B8B3858C33 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1689843186; bh=tW8gQ9Iv0yVb1OMOsfm0Vr4GKcHLfefIldR9DBxV+eQ=; h=From:To:Subject:Date:In-Reply-To:References:From; b=c6cT62DmM/AIZe//3t9onkqs6A7AJwsFOTPNB78VIu04OaAM/gngGw8DTz2Tpdwzj O2E5VCdl4zrkz2a/rEssRYqPjJ7tesTqKcrjFu23l7kiGC4+Y7Z0nGxxTCOh97A4Ih hPZWvolPbILQ4+98OozBM9ecQjs/0+33meG0Td28= From: "linkw at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/110740] [14 regression] gcc.target/powerpc/p9-vec-length-epil-1.c Date: Thu, 20 Jul 2023 08:53:05 +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: 14.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: linkw at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: linkw 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110740 Kewen Lin changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |rguenth at gcc dot gnu.org, | |rsandifo at gcc dot gnu.org --- Comment #2 from Kewen Lin --- Previously function vect_update_epilogue_niters has some code special-casing the single scalar iteration epilogue: -static bool -vect_update_epilogue_niters (loop_vec_info epilogue_vinfo, - unsigned HOST_WIDE_INT const_niters) -{ - /* Avoid wrap-around when computing const_niters - 1. Also reject - using an epilogue loop for a single scalar iteration, even if - we could in principle implement that using partial vectors. */ - unsigned int gap_niters =3D LOOP_VINFO_PEELING_FOR_GAPS (epilogue_vinfo); - if (const_niters <=3D gap_niters + 1) - return false; It's enabled without any costing consideration before, it sounds quite reasonable so I think we still want it?=