From: Dan Nicolaescu <dann@godzilla.ics.uci.edu>
To: Stelios Xanthakis <sxanth@ceid.upatras.gr>
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 18:22:00 -0000 [thread overview]
Message-ID: <200403151821.i2FILQ4J020367@scanner2.ics.uci.edu> (raw)
In-Reply-To: <Pine.GSO.4.21.0403151400100.29891-100000@zenon.ceid.upatras.gr>
Stelios Xanthakis <sxanth@ceid.upatras.gr> writes:
> On Sun, 14 Mar 2004, Dan Nicolaescu wrote:
>
> > Roger Sayle <roger@eyesopen.com> writes:
> > > fsin
> > > fmul %st(0), %st
> >
> > Intel 8.0 (that was used in the original test) generates something
> > very different:
Please be careful when snipping, the essential part that you deleted
is this:
call __libm_sse2_sincos #7.15
# LOE ebp esi edi xmm0 xmm1
..B1.4: # Preds ..B1.1
i.e. ICC 8 generates a call to an SSE library function instead of
using the fsin instruction. Given that this changed from ICC 7 to ICC
8, the library function is probably faster.
> > mulsd %xmm1, %xmm1 #10.25
> > mulsd %xmm0, %xmm0 #10.15
> > addsd %xmm1, %xmm0 #10.25
> > movsd %xmm0, (%esp) #10.25
> > fldl (%esp) #10.25
> >
>
> Does --fpmath=sse fix this?
> Can the processor in question do sse for doubles?
>
> In my experience, "--fpmath=sse --fsingle-precision-constants"
> generates much faster code for a raytracer I have here.
See above.
next prev parent reply other threads:[~2004-03-15 18:22 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 [this message]
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
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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