[ultim]

Originally Posted by qyot27

I'm definitely in favor of ifdeffing around it. My main setup is a Pentium III-era Celeron, and this was a point of contention that arose in VapourSynth. The stated solution: use AviSynth if you've got an ancient CPU.

The alternative would be to just disable asm completely on non-SSE2 CPUs, but if there's benefits to be had from MMX and SSE I wouldn't throw it out completely.

I do agree with Myrsloik that programming for Pentium3 is not worth it nowadays, but I see no harm in keeping existing code there for it. All we need to do is put a define around it so that the compiler ignores it in 64-bit builds, while it can still build in 32-bit versions. This works at least for "stable" filters. Others could have a problem, that when they are updated, the filter maintainer would have to update the MMX routines too, and there probably won't be too much motivation for that.