Re: AMD64 64bit vs 32bit speed increase
"C. Scott Ananian" <cananian@lesser-magoo.csail.mit.edu> writes:
> On Fri, 13 Feb 2004, Chris Cheney wrote:
>
> > Default optimizations I just rebuilt the debian source without the extra
> > plugins that depended on KDE/NAS/XFree86. I am not sure what the source
> > itself does or if it has been optimized for amd64 yet. The Debian
> > packaging itself certainly doesn't do anything special.
>
> well, vorbis-tools does detect amd64 in the configure scripts; i couldn't
> find that it does anything special. OTOH, ogg vorbis encoding is heavily
> floating-point dependent, and x86 is well known to have an awful
> floating-point architecture. I would be interested to see performance
> comparisons on:
> 1) integer codes -- say, one of the all-integer MP3 decoders
> 2) pointer codes -- say, gcc. Any non-media benchmark will do, really.
SPEC2000 integer (which includes gcc) is improved by 3.3%, so this is
not exactly the common case. See the GCC summit proceedings for some
more data.
--
Falk
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