Re: GCC Benchmarks (coybench), AMD64 and i686, 14 August 2004

[Toon Moene <toon at moene dot indiv dot nluug dot nl>]

Scott Robert Ladd wrote:

> There is one compiler that produces a perfect score on Paranoia: No 
> failures, defects, or flaws.
>
> GCC 3.5, on my Opteron system.
>
> Compiled with -march=opteron, GCC 3.5 has a perfect paranoia score. 
> Adding -O3 does *not* introduce any errors on the Opteron; adding 
> -ffast-math results in a *single* minor "flaw".

Last week I was at meeting 169 of J3, the Fortran Standardization body.

During that meeting I had a discussion about support for floating point 
computations by ICC and GCC.  It turns out that ICC uses both the 
multimedia floating point instructions *and* the old ix87 ones.

As far as I know, on AMD64, GCC only uses the multimedia ones.

That might explain the difference.

--
Toon Moene - mailto:toon@moene.indiv.nluug.nl - phoneto: +31 346 214290
Saturnushof 14, 3738 XG  Maartensdijk, The Netherlands
Maintainer, GNU Fortran 77: http://gcc.gnu.org/onlinedocs/g77_news.html
A maintainer of GNU Fortran 95: http://gcc.gnu.org/fortran/