From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 9A5523937421; Wed, 23 Sep 2020 17:49:27 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9A5523937421 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1600883367; bh=WTxpXMQRbkxIqUYD5Q6ryAiEtn77E2M0ndKWCQZuGsA=; h=From:To:Subject:Date:In-Reply-To:References:From; b=I8+g5QqcgzUDHdpHKWG+EQU/Gzs3QcJd7492ybXyAnrDn8mbj7fMDCzi3U8hm1QzA 9RNcQycCC80q0Toig+7DLOss+jDi1pzLl3E7qyLxjo6q8QsAkj/a1AgRHGeu+Q9RVe 2sdb2tFgT9LVSgZsQFCIFgF4hQltCgQCpX2oeGZQ= From: "already5chosen at yahoo dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/97127] FMA3 code transformation leads to slowdown on Skylake Date: Wed, 23 Sep 2020 17:49:27 +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: 10.2.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: already5chosen at yahoo 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: 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, 23 Sep 2020 17:49:27 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97127 --- Comment #8 from Michael_S --- What are values of gcc "loop" cost of the relevant instructions now? 1. AVX256 Load 2. FMA3 ymm,ymm,ymm 3. AVX256 Regmove 4. FMA3 mem,ymm,ymm=