On Mon, Oct 24, 2016 at 09:53:22PM +0200, Henrik Gramner wrote: > The decision to issue emms manually instead of after every MMX > function was a deliberate decision. I'd hardly call it "misdesigned" > to make SIMD code twice as fast at the cost of technically abusing the
It would be nice to look at a benchmarking comparison, to be able to see the actual practical performance gain of the decision not to follow the ABI. My expectation is among others that using MMX in a compliant way would remain remarkably beneficial compared to no SIMD. In a perfect world the user might be offered a build time choice: either lose N% of the performance or take the consequences of not following the ABI. Apparently, different users/packagers would make different choices, but the crucial thing would be knowing the N. Of course, offering to disable MMX _is_ such a choice, but having instead an option of "somewhat slower, compliant MMX" would be much nicer. my 2c Rune _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
