On 08/18/10 08:40 AM, Joerg Schilling wrote:
Ian Collins<i...@ianshome.com> wrote:
Some application benefit from the extended register set and function
call ABI, others suffer due to increased sizes impacting the cache.
Well, please verify your claims as they do not meet my experience.
It may be that you are right in case you don't compile with optimization.
I compile with a high level of optimization and all my applications run at
least as fast as in 32 bit mode (as mentioned, this does not apply to sparc).
BTW: this applies to Sun Studio.
A quick test with a C++ application I'm working with which does a lot of
string and container manipulation shows it
runs about 10% slower in 64 bit mode on AMD64 and about the same in 32
or 64 bit on a core i7. Built with -fast.
--
Ian.
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