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From: "bugdal at aerifal dot cx" <sourceware-bugzilla@sourceware.org> To: glibc-bugs@sourceware.org Subject: [Bug math/14412] Removal of sysdeps/x86_64/fpu/s_sincos.S causes regressions Date: Mon, 29 Apr 2013 17:30:00 -0000 [thread overview] Message-ID: <bug-14412-131-mFICW61xpM@http.sourceware.org/bugzilla/> (raw) In-Reply-To: <bug-14412-131@http.sourceware.org/bugzilla/> http://sourceware.org/bugzilla/show_bug.cgi?id=14412 --- Comment #43 from Rich Felker <bugdal at aerifal dot cx> 2013-04-29 17:30:14 UTC --- I don't have a copy of the latest IEEE 754 on hand (there's no free online version), but the consensus among implementors seems to be that a few special functions (such as sqrt) require correct rounding, and that the remaining functions (mostly transcendental) are required to give results with less than 1ulp of error. If sin(0x1p1000) is computed with incorrect argument reduction, it may have up to approximately 1e16 ulp error. Moreover, the C standard specifies: "2 The sin functions compute the sine of x (measured in radians). Returns 3 The sin functions return sin x." Without annex F, the C standard places no requirements on the precision or accuracy of floating point results (e.g. 2.0+2.0==5.0 is legal), but annex F recommends IEEE conforming behavior. If anyone else can provide some better citations, they'd be welcome. -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
next prev parent reply other threads:[~2013-04-29 17:30 UTC|newest] Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-07-26 21:08 [Bug math/14412] New: Removal of sysdeps/x86_64/fpu/s_sincos.S causes pdf rendering time regression markus at trippelsdorf dot de 2012-07-26 21:09 ` [Bug math/14412] " markus at trippelsdorf dot de 2012-07-26 21:14 ` markus at trippelsdorf dot de 2012-07-27 6:44 ` aj at suse dot de 2012-07-27 7:18 ` markus at trippelsdorf dot de 2012-07-27 12:33 ` markus at trippelsdorf dot de 2012-07-28 22:15 ` bugdal at aerifal dot cx 2012-08-03 3:51 ` carlos_odonell at mentor dot com 2012-08-09 10:14 ` markus at trippelsdorf dot de 2012-08-19 9:31 ` markus at trippelsdorf dot de 2012-08-19 9:37 ` [Bug math/14412] Removal of sysdeps/x86_64/fpu/s_sincos.S causes regressions markus at trippelsdorf dot de 2012-12-03 22:13 ` davem at davemloft dot net 2012-12-04 0:00 ` carlos at systemhalted dot org 2013-04-25 21:48 ` wbrana at gmail dot com 2013-04-25 23:35 ` carlos at redhat dot com 2013-04-25 23:58 ` bugdal at aerifal dot cx 2013-04-26 0:14 ` bugdal at aerifal dot cx 2013-04-26 2:55 ` siddhesh at redhat dot com 2013-04-26 3:08 ` bugdal at aerifal dot cx 2013-04-26 3:50 ` siddhesh at redhat dot com 2013-04-26 6:29 ` markus at trippelsdorf dot de 2013-04-26 6:40 ` jakub at redhat dot com 2013-04-26 10:00 ` siddhesh at redhat dot com 2013-04-26 11:31 ` joseph at codesourcery dot com 2013-04-26 11:33 ` joseph at codesourcery dot com 2013-04-26 11:42 ` siddhesh at redhat dot com 2013-04-26 13:52 ` bugdal at aerifal dot cx 2013-04-26 13:55 ` bugdal at aerifal dot cx 2013-04-26 15:07 ` joseph at codesourcery dot com 2013-04-26 15:20 ` wbrana at gmail dot com 2013-04-29 10:29 ` siddhesh at redhat dot com 2013-04-29 10:50 ` wbrana at gmail dot com 2013-04-29 11:55 ` bugdal at aerifal dot cx 2013-04-29 12:32 ` wbrana at gmail dot com 2013-04-29 13:21 ` Ondřej Bílka 2013-04-29 13:21 ` neleai at seznam dot cz 2013-04-29 13:28 ` bugdal at aerifal dot cx 2013-04-29 14:04 ` Ondřej Bílka 2013-04-29 13:32 ` bugdal at aerifal dot cx 2013-04-29 13:36 ` wbrana at gmail dot com 2013-04-29 13:44 ` siddhesh at redhat dot com 2013-04-29 13:51 ` bugdal at aerifal dot cx 2013-04-29 14:04 ` neleai at seznam dot cz 2013-04-29 14:19 ` siddhesh at redhat dot com 2013-04-29 14:29 ` markus at trippelsdorf dot de 2013-04-29 14:48 ` bugdal at aerifal dot cx 2013-04-29 16:29 ` Ondřej Bílka 2013-04-29 16:29 ` neleai at seznam dot cz 2013-04-29 17:30 ` bugdal at aerifal dot cx [this message] 2013-04-29 20:58 ` joseph at codesourcery dot com 2013-04-30 5:41 ` siddhesh at redhat dot com 2013-04-30 21:37 ` bugdal at aerifal dot cx 2013-05-01 22:25 ` bugdal at aerifal dot cx 2013-07-16 20:08 ` nshmyrev at yandex dot ru 2013-09-07 6:55 ` carlos at redhat dot com 2014-02-06 18:31 ` jsm28 at gcc dot gnu.org 2014-06-17 18:55 ` fweimer at redhat dot com
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