From: Gabriel Dos_Reis <gdosreis@sophia.inria.fr>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Tim Hollebeek <tim@hollebeek.com>,
Theodore Papadopoulo <Theodore.Papadopoulo@sophia.inria.fr>,
Gabriel Dos Reis <gdr@codesourcery.com>, <dewar@gnat.com>,
<amylaar@redhat.com>, <aoliva@redhat.com>, <gcc@gcc.gnu.org>,
<moshier@moshier.ne.mediaone.net>, <tprince@computer.org>
Subject: Re: What is acceptable for -ffast-math? (Was: associative law incombine)
Date: Wed, 01 Aug 2001 10:26:00 -0000 [thread overview]
Message-ID: <15208.15111.761855.922613@perceval.inria.fr> (raw)
In-Reply-To: <Pine.LNX.4.33.0108010929020.20829-100000@penguin.transmeta.com>
| Now, show me a case where a/b/c -> a/(b*c) is significantly less accurate?
On a 64-bit double processor just take
b = c = 2 * sqrt(DBL_MAX);
a = 0.5 * DBL_MAX
a/(b*c) is 0.0 whereas a/b/c yields 0.125.
-- Gaby
next prev parent reply other threads:[~2001-08-01 10:26 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-30 21:13 What is acceptable for -ffast-math? (Was: associative law in combine) dewar
2001-07-30 21:34 ` Gabriel Dos Reis
2001-07-30 21:43 ` Joern Rennecke
2001-07-30 21:53 ` Gabriel Dos Reis
2001-08-03 7:12 ` Nick Ing-Simmons
2001-07-31 18:12 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-08-01 8:55 ` What is acceptable for -ffast-math? (Was: associative law in combine) Theodore Papadopoulo
2001-08-01 9:15 ` Gabriel Dos Reis
2001-08-01 11:21 ` Theodore Papadopoulo
2001-08-01 11:44 ` Gabriel Dos Reis
2001-08-01 11:58 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-08-01 9:24 ` What is acceptable for -ffast-math? (Was: associative law in combine) Tim Hollebeek
2001-08-01 9:54 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-08-01 10:26 ` Gabriel Dos_Reis [this message]
2001-08-01 10:35 ` Linus Torvalds
2001-08-01 10:45 ` Gabriel Dos_Reis
2001-08-01 11:13 ` What is acceptable for -ffast-math? (Was: associative law in combine) Alexandre Oliva
2001-08-01 11:36 ` Gabriel Dos Reis
2001-08-01 12:07 ` Alexandre Oliva
2001-08-01 13:21 ` Gabriel Dos_Reis
2001-08-01 14:20 ` Toon Moene
-- strict thread matches above, loose matches on Subject: below --
2001-08-01 10:38 dewar
2001-08-01 10:46 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-08-01 10:58 ` Gabriel Dos_Reis
2001-08-01 10:28 What is acceptable for -ffast-math? (Was: associative law in combine) Gabriel Dos_Reis
2001-08-01 10:41 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-08-01 10:55 ` Gabriel Dos_Reis
2001-08-01 10:13 What is acceptable for -ffast-math? (Was: associative law in combine) dewar
2001-08-01 10:32 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-08-01 9:46 Wolfgang Bangerth
2001-08-01 9:58 ` Gabriel Dos_Reis
2001-08-01 10:08 ` Wolfgang Bangerth
2001-08-01 11:12 ` Gabriel Dos_Reis
2001-07-31 17:37 What is acceptable for -ffast-math? (Was: associative law in combine) dewar
2001-07-31 19:05 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-07-31 7:26 What is acceptable for -ffast-math? (Was: associative law in combine) dewar
2001-07-31 17:28 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-07-30 21:11 What is acceptable for -ffast-math? (Was: associative law in combine) Gabriel Dos Reis
2001-07-31 18:12 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-07-30 19:22 What is acceptable for -ffast-math? (Was: associative law in combine) Alexandre Oliva
2001-07-30 21:31 ` What is acceptable for -ffast-math? (Was: associative law incombine) Mark Mitchell
2001-07-30 16:29 What is acceptable for -ffast-math? (Was: associative law in combine) Alexandre Oliva
2001-07-30 17:21 ` What is acceptable for -ffast-math? (Was: associative law incombine) Joseph S. Myers
2001-07-30 13:10 What is acceptable for -ffast-math? (Was: associative law in combine) dewar
2001-07-31 2:54 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-07-30 8:59 What is acceptable for -ffast-math? (Was: associative law in combine) mike stump
2001-07-30 15:46 ` What is acceptable for -ffast-math? (Was: associative law incombine) Stephen L Moshier
2001-07-30 6:00 What is acceptable for -ffast-math? (Was: associative law in combine) dewar
2001-07-30 10:34 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-07-30 0:23 What is acceptable for -ffast-math? (Was: associative law in combine) Gabriel Dos Reis
2001-07-30 11:37 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-07-29 14:22 What is acceptable for -ffast-math? (Was: associative law in combine) dewar
2001-07-29 21:33 ` What is acceptable for -ffast-math? (Was: associative law incombine) Linus Torvalds
2001-07-29 12:52 * Re: What is acceptable for -ffast-math? (Was: associative lawin combine) Linus Torvalds
2001-07-29 14:03 ` What is acceptable for -ffast-math? (Was: associative law incombine) Stephen L Moshier
2001-07-29 21:08 ` Linus Torvalds
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=15208.15111.761855.922613@perceval.inria.fr \
--to=gdosreis@sophia.inria.fr \
--cc=Theodore.Papadopoulo@sophia.inria.fr \
--cc=amylaar@redhat.com \
--cc=aoliva@redhat.com \
--cc=dewar@gnat.com \
--cc=gcc@gcc.gnu.org \
--cc=gdr@codesourcery.com \
--cc=moshier@moshier.ne.mediaone.net \
--cc=tim@hollebeek.com \
--cc=torvalds@transmeta.com \
--cc=tprince@computer.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).