"Garrett D'Amore" <garr...@nexenta.com> wrote:
> It can be as simple as impact on the cache. 64-bit programs tend to be
> bigger, and so they have a worse effect on the i-cache.
>
> Unless your program does something that can inherently benefit from
> 64-bit registers, or can take advantage of the richer instruction set
> that is available to amd64 programs, you probably will see a degradation
> when running 64-bit programs.
>
> That said, I think a great number of programs *do* benefit from the
> larger registers, and from the richer ISA available to 64-bit programs.
If you have an orthogonal architecture like sparc, a typical 64 bit program is
indeed a bit slower than the same program in 32 bit.
On Amd64, you have twice as many registers in 64 bit mode and this is the
reason for a typical performance gain of ~ 30% for 64 bit applications.
Jörg
--
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