From: "Bernhard R. Link" <brl@pcpool00.mathematik.uni-freiburg.de>
To: Georg Bauhaus <bauhaus@futureapps.de>
Cc: gcc@gcc.gnu.org
Subject: Re: Sine and Cosine Accuracy
Date: Mon, 30 May 2005 19:17:00 -0000 [thread overview]
Message-ID: <20050530180307.GA6704@pcpool00.mathematik.uni-freiburg.de> (raw)
In-Reply-To: <429B4EAC.8020601@futureapps.de>
* Georg Bauhaus <bauhaus@futureapps.de> [050530 19:34]:
> Programmers write calls to functions named "sin" and "cos" for
> reaons of getting a result that is near what the mathematical
> model (involving the same names sin and cos) would suggest.
> Question is, how and when should GCC enable a programmer to
> trigger either library procedures, or procedures built
> into the processor. There is no full mathematical trigonometry
> inside the processor, and probably not in any T(n) < infty
> library function. But there is reason to use either of them
> depending on your application. Scott explains.
As I stated in my earlier mail, I'm not opposed against some
limitation of arguments (2^60 is a large number for me, when it is
correctly documented). What I'm arguing against is an argument
telling only [0,2\pi] is in any sense of the word 'correct'
range for those functions, or in any way sensible range for
computations of those. Code like
"if( x+y < 2*pi) return sin(x+y); else return(x+y-2*pi);" would
really be useable to make me run around screaming, but
naming any range smaller than some [-50pi,100pi] "valid" could
really make me crazy...
Bernhard R. Link
next prev parent reply other threads:[~2005-05-30 18:03 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-26 16:05 Scott Robert Ladd
2005-05-26 16:09 ` Andrew Haley
2005-05-26 16:33 ` Scott Robert Ladd
2005-05-26 17:14 ` Andrew Haley
2005-05-26 17:01 ` Paolo Carlini
2005-05-26 17:23 ` Richard Henderson
2005-05-26 17:24 ` Scott Robert Ladd
2005-05-26 17:27 ` Paul Koning
2005-05-26 17:27 ` Scott Robert Ladd
2005-05-26 17:29 ` Dave Korn
2005-05-26 17:37 ` David Daney
2005-05-26 17:56 ` Dave Korn
2005-05-26 17:40 ` Scott Robert Ladd
2005-05-26 18:12 ` Paul Koning
2005-05-26 18:32 ` Scott Robert Ladd
2005-05-26 18:50 ` Paul Koning
2005-05-26 19:14 ` Andrew Pinski
2005-05-26 19:35 ` Scott Robert Ladd
2005-05-29 6:22 ` Geoffrey Keating
2005-05-31 14:34 ` Paul Koning
2005-05-31 22:58 ` Geoff Keating
2005-05-29 12:07 ` Roger Sayle
2005-05-30 15:34 ` Vincent Lefevre
2005-05-29 2:22 ` Kai Henningsen
2005-05-29 18:16 ` Marc Espie
2005-05-29 20:58 ` Georg Bauhaus
2005-05-30 15:19 ` Gabriel Dos Reis
2005-05-30 15:19 ` Marc Espie
2005-05-30 17:26 ` Scott Robert Ladd
2005-05-30 17:18 ` Marc Espie
2005-05-30 18:11 ` Scott Robert Ladd
2005-05-30 17:31 ` Scott Robert Ladd
2005-05-31 3:10 ` chris jefferson
2005-05-31 12:17 ` Andrew Haley
2005-05-31 12:46 ` Scott Robert Ladd
2005-05-31 13:02 ` Andrew Haley
2005-05-31 13:34 ` Vincent Lefevre
2005-05-30 15:35 ` Bernhard R. Link
2005-05-30 18:59 ` Scott Robert Ladd
2005-05-30 19:16 ` Georg Bauhaus
2005-05-30 19:17 ` Bernhard R. Link [this message]
2005-05-30 19:54 ` Georg Bauhaus
2005-05-30 20:04 ` Gabriel Dos Reis
2005-05-26 17:35 ` Kevin Handy
2005-05-26 17:41 ` Paul Koning
2005-05-26 20:26 ` Joseph S. Myers
2005-05-26 21:15 ` Gabriel Dos Reis
2005-05-26 21:17 ` Scott Robert Ladd
2005-05-26 23:25 ` Gabriel Dos Reis
2005-05-27 0:18 ` Scott Robert Ladd
2005-05-27 0:54 ` Gabriel Dos Reis
2005-05-27 11:29 ` Marcin Dalecki
2005-05-27 9:36 ` Marcin Dalecki
2005-05-27 10:48 ` Marcin Dalecki
2005-05-26 21:33 ` Richard Henderson
2005-05-27 0:05 ` Scott Robert Ladd
2005-05-27 0:43 ` Gabriel Dos Reis
2005-05-27 0:54 ` Scott Robert Ladd
2005-05-28 11:26 ` Russ Allbery
2005-05-27 13:56 ` Vincent Lefevre
2005-05-29 3:36 ` Kai Henningsen
2005-05-26 17:53 Morten Welinder
2005-05-26 18:10 ` Scott Robert Ladd
2005-05-26 18:22 ` Dave Korn
2005-05-26 18:49 ` Scott Robert Ladd
2005-05-26 19:28 ` Dave Korn
2005-05-26 18:38 Morten Welinder
2005-05-26 20:58 ` Andrew Haley
2005-05-26 23:31 Uros Bizjak
2005-05-26 23:52 ` Paul Koning
2005-05-26 23:56 ` Gabriel Dos Reis
2005-05-26 23:57 ` Steven Bosscher
2005-05-27 15:09 ` Olivier Galibert
2005-05-27 15:28 ` Vincent Lefevre
2005-05-27 18:27 ` Marcin Dalecki
2005-05-26 23:59 Menezes, Evandro
2005-05-27 15:19 ` Vincent Lefevre
2005-05-27 0:39 Menezes, Evandro
2005-05-27 0:54 ` Scott Robert Ladd
2005-05-27 0:54 Menezes, Evandro
2005-05-27 0:54 ` Scott Robert Ladd
2005-05-27 12:42 ` Scott Robert Ladd
2005-05-28 4:32 Menezes, Evandro
2005-05-28 5:02 ` Scott Robert Ladd
2005-05-28 10:44 ` Gary Funck
2005-05-28 6:42 Menezes, Evandro
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20050530180307.GA6704@pcpool00.mathematik.uni-freiburg.de \
--to=brl@pcpool00.mathematik.uni-freiburg.de \
--cc=bauhaus@futureapps.de \
--cc=gcc@gcc.gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).