Hi Dmitry,
On Fri, January 24, 2014 08:32, Dmitry Stogov wrote:
> Unfortunately, my benchmarks on Linux show that 64-bit PHP builds are
> always a bit slower on real-life applications. It's because 64-bit PHP uses
> more memory and as result causes more CPU cache misses.
>
i suppose the perf test on windows to be done today.
That topic was also it my mind while worked on str_size_and_int64 branch.
What I have seen is that till now PHP code doesn't really care about 64
bit performance. I was reading the "Software Optimization Guide for AMD64
Processors" http://support.amd.com/TechDocs/25112.PDF and
comparing with
their recomendations one can find many places in PHP code needing some
refactoring. Some primitive points to name like use of non contiguous
values in switches, 32 bit vars in loops, no homogeneous 64 bit vars
usage, etc. - could be improved. One of good moves is usage of the const
qualifier lately. Now with the consistent 64 bit support such a
refactoring would have base and sense.
Regards
Anatol