On Sun, Oct 25, 2015 at 5:39 PM, Matt Oliver <protogo...@gmail.com> wrote: > Using tzcnt would be the more interesting option. Changing the asm to tzcnt > works with ICL. But also the use of the tzcnt intrinsic (_tzcnt_u64) would > be possible with both intel and msvc. I dont have anything older than > Haswell or Piledriver to double check but I have seen its use in several > other projects without issue so in theory it shouldnt be a problem.
IIRC tzcnt (rep bsf) is only slower than plain bsf on really ancient machines, e.g. 80486 and such, so there's not really any downside of using it. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
