Re: 64-bit optimizations

Hello Vasilis,

there are specific AMD64 optimizations in current xvid, but indeed these
don't make much use of the additional available registers. However, the
speed-up from these is also somewhat limited as for most of the asm code
the register pressure isn't that high.

I have no AMD64 myself but from reports I got the speed-up of the 64 bit
version is ~5-10% iirc.

Regards,
Michael


Quoting Vasilis Liaskovitis <[email protected]>:

> Hello,
>
> what are the specific AMD 64-bit optimizations in the current xvid (cvs)
> version?
> For example, are the additional sse registers used in any part of the
> encoder? Looking at the x86_64_asm files, this doesn't seem to be the case.
> Can anyone report execution times / datainputs when comparing 32-bit vs.
> 64-bit versions of xvid_encraw on AMD64 e.g. Athlon? What speedups are you
> getting?
> thanks,
>
> - Vasilis