From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from esa1.mentor.iphmx.com (esa1.mentor.iphmx.com [68.232.129.153]) by sourceware.org (Postfix) with ESMTPS id 07A1B3858C52 for ; Fri, 9 Sep 2022 17:57:34 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 07A1B3858C52 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=codesourcery.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=mentor.com X-IronPort-AV: E=Sophos;i="5.93,303,1654588800"; d="scan'208";a="85504063" Received: from orw-gwy-01-in.mentorg.com ([192.94.38.165]) by esa1.mentor.iphmx.com with ESMTP; 09 Sep 2022 09:57:25 -0800 IronPort-SDR: JW0bdKJM3aBV/KOSfMvoRiN6cqnKhLQy9iXyJUBwd33SJQ6RHXubExvv/fVSnHnMPcaUSAI4bK UXIpcfUM8otigMqLj/wVAY1PzzYKdGP4vRuMw5zpPZb2TYgMMZBE9BSvS2pM7Sum/S/cHwhbtF XG2YlEuunHrJ4vpmkBmWg/r9F2OpuJ5n7mkwLglIp9w/5ca7AKyf8OWzwFg4Ix8QRrHSljNq/Z WgKxlaUjtZCwnHBgsatPuyHltAL5XTYrLOzSir+eozFO/cCzsNBIGy7IC/DKDKIAOvlfcsurfr OWE= Date: Fri, 9 Sep 2022 17:57:21 +0000 From: Joseph Myers X-X-Sender: jsm28@digraph.polyomino.org.uk To: Kwok Cheung Yeung CC: gcc-patches , Andrew Stubbs Subject: Re: [PATCH] amdgcn: Add support for additional natively supported floating-point operations In-Reply-To: Message-ID: References: User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" X-Originating-IP: [137.202.0.90] X-ClientProxiedBy: svr-ies-mbx-13.mgc.mentorg.com (139.181.222.13) To svr-ies-mbx-10.mgc.mentorg.com (139.181.222.10) X-Spam-Status: No, score=-3111.3 required=5.0 tests=BAYES_00,HEADER_FROM_DIFFERENT_DOMAINS,KAM_DMARC_STATUS,SPF_HELO_PASS,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On Thu, 8 Sep 2022, Kwok Cheung Yeung wrote: > The sin and cos instructions for some reason are scaled by 2*PI radians (i.e. > 1.0 == 2*PI radians/360 degrees), so their inputs need to be scaled by > 1/(2*PI) first. I've implemented this as an expander to two instructions - one C2x has sinpi and cospi function families for sin(pi*x) and cos(pi*x); adding built-in functions / insn patterns for those functions would then allow those instructions to be used for those functions with scaling by 1/2. -- Joseph S. Myers joseph@codesourcery.com