From owner-freebsd-toolchain@freebsd.org Wed Mar 13 15:42:18 2019 Return-Path: Delivered-To: freebsd-toolchain@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 7686615372E9; Wed, 13 Mar 2019 15:42:18 +0000 (UTC) (envelope-from hps@selasky.org) Received: from mail.turbocat.net (turbocat.net [88.99.82.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 9B53584E8E; Wed, 13 Mar 2019 15:42:17 +0000 (UTC) (envelope-from hps@selasky.org) Received: from hps2016.home.selasky.org (unknown [176.74.212.121]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.turbocat.net (Postfix) with ESMTPSA id 78E84260306; Wed, 13 Mar 2019 16:42:15 +0100 (CET) Subject: Re: Optimization bug with floating-point? To: sgk@troutmask.apl.washington.edu, freebsd-toolchain@freebsd.org, freebsd-current@freebsd.org References: <20190313024506.GA31746@troutmask.apl.washington.edu> <20190313151635.GA34757@troutmask.apl.washington.edu> From: Hans Petter Selasky Message-ID: <14ead2c2-b586-309d-947f-1395b5284dd1@selasky.org> Date: Wed, 13 Mar 2019 16:41:51 +0100 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190313151635.GA34757@troutmask.apl.washington.edu> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 9B53584E8E X-Spamd-Bar: ----- Authentication-Results: mx1.freebsd.org; spf=pass (mx1.freebsd.org: domain of hps@selasky.org designates 88.99.82.50 as permitted sender) smtp.mailfrom=hps@selasky.org X-Spamd-Result: default: False [-5.43 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-0.999,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; R_SPF_ALLOW(-0.20)[+a:mail.turbocat.net]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; DMARC_NA(0.00)[selasky.org]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_SOME(0.00)[]; MX_GOOD(-0.01)[cached: mail.turbocat.net]; NEURAL_HAM_SHORT(-0.91)[-0.907,0]; IP_SCORE(-3.21)[ip: (-9.45), ipnet: 88.99.0.0/16(-4.66), asn: 24940(-1.94), country: DE(-0.01)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; SUBJECT_ENDS_QUESTION(1.00)[]; ASN(0.00)[asn:24940, ipnet:88.99.0.0/16, country:DE]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-toolchain@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Maintenance of FreeBSD's integrated toolchain List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Mar 2019 15:42:18 -0000 On 3/13/19 4:16 PM, Steve Kargl wrote: > On Tue, Mar 12, 2019 at 07:45:41PM -0700, Steve Kargl wrote: >> >> gcc8 --version >> gcc8 (FreeBSD Ports Collection) 8.3.0 >> >> gcc8 -fno-builtin -o z a.c -lm && ./z >> gcc8 -O -fno-builtin -o z a.c -lm && ./z >> gcc8 -O2 -fno-builtin -o z a.c -lm && ./z >> gcc8 -O3 -fno-builtin -o z a.c -lm && ./z >> >> Max ULP: 2.297073 >> Count: 0 (# of ULP that exceed 21) >> > > clang agrees with gcc8 if one changes ... > >> int >> main(void) >> { >> double re, im, u, ur, ui; >> float complex f; >> float x, y; > > this line to "volatile float x, y". > Can you try to use: #define sincos(x,p,q) do { \ *(p) = sin(x); \ *(q) = cos(x); \ } while (0) Instead of libm's sincos(). Might be a bug in there. --HPS