On 08/18/10 12:05 AM, Joerg Schilling wrote:
Ian Collins<i...@ianshome.com> wrote:
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.
Do you have the data to back that up? Most things I've looked at on X64
are slower in 64 bit mode.
Did you test on sparc or amd64? See above...
I said x64.
Some application benefit from the extended register set and function
call ABI, others suffer due to increased sizes impacting the cache.
--
Ian.
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