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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.


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