From: Gabriel Dos Reis <gdr@integrable-solutions.net>
To: Scott Robert Ladd <coyote@coyotegulch.com>
Cc: Roger Sayle <roger@eyesopen.com>, gcc@gcc.gnu.org
Subject: Re: GCC viciously beaten by ICC in trig test!
Date: Mon, 15 Mar 2004 03:05:00 -0000 [thread overview]
Message-ID: <m365d6u8dv.fsf@uniton.integrable-solutions.net> (raw)
In-Reply-To: <40551459.8050909@coyotegulch.com>
Scott Robert Ladd <coyote@coyotegulch.com> writes:
| Roger Sayle wrote:
| > Consider the following:
| > #include <math.h>
| > double doit(double a) { return sin(a) * sin(a); }
| > Compiling with gcc -O2 -ffast-math on Linux generates x86 code that's
| > significantly slower than Intel's compiler output. However,
| > commenting out the "#include <math.h>" corrects the situation and GCC
| > can then generate *exactly* the same sequence as icc.
|
| Wonderful! This is *exactly* the insight I was looking for...
Note that it has been reported in the past the the x86 native
instruction fsin yields incorrect results for values outside or a
certain interval (I can't remember which exactly).
[...]
| Sometimes, I wonder if GCC should ship its own Standard C library, just
| as it ships a Standard C++ template library. However, I suspect the
| suggesting such a move might be a bit controversial... ;)
Yep, but it would make V3 happy ;-)
-- Gaby
next prev parent reply other threads:[~2004-03-15 3:05 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-14 23:40 Scott Robert Ladd
2004-03-14 23:49 ` Gabriel Dos Reis
2004-03-15 1:47 ` Scott Robert Ladd
2004-03-15 0:11 ` Paolo Carlini
2004-03-15 1:47 ` Scott Robert Ladd
2004-03-15 2:07 ` Daniel Berlin
2004-03-15 2:30 ` Scott Robert Ladd
2004-03-15 2:31 ` Daniel Berlin
2004-03-15 2:38 ` Scott Robert Ladd
2004-03-15 10:00 ` Sebastian Pop
2004-03-15 0:12 ` GCC beaten by ICC in stupid " Andrew Pinski
2004-03-15 0:32 ` Paolo Carlini
2004-03-15 1:31 ` Scott Robert Ladd
2004-03-15 2:36 ` Scott Robert Ladd
2004-03-15 11:25 ` Paolo Carlini
2004-03-15 11:31 ` Paolo Carlini
2004-03-15 13:29 ` Zdenek Dvorak
2004-03-15 13:42 ` Paolo Carlini
2004-03-15 13:51 ` Zdenek Dvorak
2004-03-15 13:55 ` Paolo Carlini
2004-03-15 14:00 ` Zdenek Dvorak
2004-03-15 14:05 ` Joseph S. Myers
2004-03-15 14:13 ` Paolo Carlini
2004-03-15 14:18 ` Zdenek Dvorak
2004-03-15 14:29 ` Segher Boessenkool
2004-03-15 14:28 ` Joseph S. Myers
2004-03-15 1:55 ` GCC viciously beaten by ICC in " Roger Sayle
2004-03-15 2:22 ` Dan Nicolaescu
2004-03-15 12:05 ` Stelios Xanthakis
2004-03-15 18:22 ` Dan Nicolaescu
2004-03-15 2:41 ` Kaveh R. Ghazi
2004-03-15 6:06 ` Andreas Jaeger
2004-03-15 8:57 ` Gabriel Dos Reis
2004-03-15 2:41 ` Scott Robert Ladd
2004-03-15 3:05 ` Gabriel Dos Reis [this message]
2004-03-15 14:47 ` Segher Boessenkool
2004-03-15 17:44 ` Geert Bosch
2004-03-15 17:46 ` Geert Bosch
2004-03-15 3:01 ` Gabriel Dos Reis
2004-03-15 4:06 ` Scott Robert Ladd
2004-03-15 5:15 ` James Morrison
2004-03-15 8:20 ` Jakub Jelinek
2004-03-15 18:13 ` Joe Buck
2004-03-16 13:31 ` Jakub Jelinek
2004-03-15 7:42 ` Ranjit Mathew
2004-03-15 19:00 ` Toon Moene
2004-03-15 19:44 ` Laurent GUERBY
2004-03-15 3:19 Stephan T. Lavavej
2004-03-15 3:29 ` Gabriel Dos Reis
2004-03-15 12:40 ` Scott Robert Ladd
2004-03-15 12:53 ` Gabriel Dos Reis
2004-03-15 13:37 ` Scott Robert Ladd
2004-03-15 15:11 ` Ian Lance Taylor
2004-03-15 16:25 ` Stephan T. Lavavej
2004-03-15 16:40 ` Jakub Jelinek
2004-03-15 16:46 ` Ian Lance Taylor
2004-03-15 16:56 ` Paolo Carlini
2004-03-15 17:10 ` Gabriel Dos Reis
2004-03-15 17:15 ` Paolo Carlini
2004-03-15 17:58 ` Gabriel Dos Reis
2004-03-15 16:59 ` Gabriel Dos Reis
2004-03-15 17:28 ` Ian Lance Taylor
2004-03-15 17:47 ` Gabriel Dos Reis
2004-03-15 17:52 ` Joe Buck
2004-03-15 17:53 ` Phil Edwards
2004-03-15 17:45 ` Joe Buck
2004-03-15 19:50 ` Scott Robert Ladd
2004-03-16 1:00 ` Zack Weinberg
2004-03-17 0:07 ` Kai Henningsen
2004-03-16 23:12 ` Kai Henningsen
2004-03-17 3:00 ` Ian Lance Taylor
2004-03-15 17:42 ` Joe Buck
2004-03-17 0:31 Stephan T. Lavavej
2004-03-17 3:30 ` Ian Lance Taylor
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