From owner-freebsd-toolchain@freebsd.org Wed Mar 13 15:50:13 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 437F515377B0; Wed, 13 Mar 2019 15:50:13 +0000 (UTC) (envelope-from sgk@troutmask.apl.washington.edu) Received: from troutmask.apl.washington.edu (troutmask.apl.washington.edu [128.95.76.21]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "troutmask", Issuer "troutmask" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id E03CF856FC; Wed, 13 Mar 2019 15:50:11 +0000 (UTC) (envelope-from sgk@troutmask.apl.washington.edu) Received: from troutmask.apl.washington.edu (localhost [127.0.0.1]) by troutmask.apl.washington.edu (8.15.2/8.15.2) with ESMTPS id x2DFo9lG034951 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Wed, 13 Mar 2019 08:50:09 -0700 (PDT) (envelope-from sgk@troutmask.apl.washington.edu) Received: (from sgk@localhost) by troutmask.apl.washington.edu (8.15.2/8.15.2/Submit) id x2DFo9qJ034950; Wed, 13 Mar 2019 08:50:09 -0700 (PDT) (envelope-from sgk) Date: Wed, 13 Mar 2019 08:50:09 -0700 From: Steve Kargl To: Hans Petter Selasky Cc: freebsd-toolchain@freebsd.org, freebsd-current@freebsd.org Subject: Re: Optimization bug with floating-point? Message-ID: <20190313155009.GA34852@troutmask.apl.washington.edu> Reply-To: sgk@troutmask.apl.washington.edu References: <20190313024506.GA31746@troutmask.apl.washington.edu> <20190313151635.GA34757@troutmask.apl.washington.edu> <14ead2c2-b586-309d-947f-1395b5284dd1@selasky.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <14ead2c2-b586-309d-947f-1395b5284dd1@selasky.org> User-Agent: Mutt/1.11.2 (2019-01-07) X-Rspamd-Queue-Id: E03CF856FC X-Spamd-Bar: +++ Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [3.99 / 15.00]; ARC_NA(0.00)[]; HAS_REPLYTO(0.00)[sgk@troutmask.apl.washington.edu]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; TO_DN_SOME(0.00)[]; IP_SCORE(0.02)[ip: (0.09), ipnet: 128.95.0.0/16(0.08), asn: 73(0.01), country: US(-0.07)]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; DMARC_NA(0.00)[washington.edu]; AUTH_NA(1.00)[]; REPLYTO_ADDR_EQ_FROM(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_SPAM_SHORT(0.72)[0.724,0]; RCVD_IN_DNSWL_MED(-0.20)[21.76.95.128.list.dnswl.org : 127.0.11.2]; MX_GOOD(-0.01)[cached: troutmask.apl.washington.edu]; NEURAL_SPAM_LONG(0.92)[0.921,0]; NEURAL_SPAM_MEDIUM(0.63)[0.628,0]; R_SPF_NA(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; SUBJECT_ENDS_QUESTION(1.00)[]; ASN(0.00)[asn:73, ipnet:128.95.0.0/16, country:US]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_LAST(0.00)[] 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 15:50:13 -0000 On Wed, Mar 13, 2019 at 04:41:51PM +0100, Hans Petter Selasky wrote: > 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. > Using sin() and cos() directly as in /* Double precision csinh() without using C's double complex.s */ void dp_csinh(double x, double y, double *re, double *im) { double c, s; *re = sinh(x) * cos(y); *im = cosh(x) * sin(y); } does not change the result. I'll also note that libm is compiled by clang, and I do not recompile it for the tests. Both gcc8 and cc are using the same libm. I've also tested clang of amd64 with the -m32, it fails as well. -- Steve