Jon Harrop wrote:
> I just bought a new Athlon 64 laptop and installed 32- and 64-bit Debian.
> Here are some timings, showing the performance change when moving from 32-
> to 64-bit using ocamlopt (3.08.2) and g++ (3.4.4):
...
> 
> So ocamlopt does seem to generate significantly better code in these examples, 
> particularly when they are floating point intensive. Also, only one test is 
> slower in 64-bit, due to its heavy use of trees.
> 

Why do you suppose is there *any* benchmark faster in 32 bit mode than 
in 64 bit mode on the Athlon64? Since the AMD64 architecture is 
generally better than IA32--were it only for the additional registers--I 
would expect all benchmarks to run as fast or faster when compiled to 
the AMD64 instruction set.

Alex

-- 
*********************************************************************
http://www.barettadeit.com/
Baretta DE&IT
A division of Baretta SRL

tel. +39 02 370 111 55
fax. +39 02 370 111 54

Our technology:

The Application System/Xcaml (AS/Xcaml)
<http://www.asxcaml.org/>

The FreerP Project
<http://www.freerp.org/>