On 05/10/2015 18:25, Stroller wrote: > >> On Sun, 4 October 2015, at 11:38 p.m., Alan McKinnon >> <alan.mckin...@gmail.com> wrote: >> >>> I see that the ffmpeg ebuild requires that mmxext is set if sse is set. >>> >>> Isn't mmxext amd-only? >> >> Definitely not. Intel designed mmx > > The ffmpeg has both "mmx" and "mmxext" USE flags - presumably they're not the > same thing.
Correct. mmxext is AMD's set of extensions to standard mmx. Useful stuff from mmxext later made it's way into sse. http://softpixel.com/~cwright/programming/simd/mmxext.php > > CPU_FLAGS_X86="3dnow 3dnowext avx avx2 fma3 fma4 mmx mmxext sse sse2 sse3 > sse4_1 sse4_2 ssse3 xop" > > My AMD Neon supports both. -- Alan McKinnon alan.mckin...@gmail.com
