This patch set adds support for AVX-512 functions to be written. While not immediately useful this does let people start writing them.
Presently it lumps a "more manageable" set of sub-features into the overall AVX-512 flag. Just to be clear: current processors severly limit the performace when executing instructions on ZMM registers (512-bit). Switching between the states also takes some time. Therefore functions that use them should be tested carefully in "real-world" conditions to ensure that overall performance doesn't drop. However, as Gramner points out in his x86inc commit, it provides an additional 16 registers for a total of 32 SIMD registers. These can all be used in XMM (128-bit) and YMM (256-bit) forms. New instructions can also be used on these smaller registers. There are 2 commits here that I don't intend to be applied (now). The first is the alignment increase reported by avutil. The second is the v210enc function, it passes checkasm but it is not any faster. It is there to show that all the previous commits work correctly, namely: configure checks, cpuid detection, x86inc changes, checkasm. P.S. I forgot to reword the commit message of "x86inc: reduce difference to x264 upstream" to state what it does and why. The smartalign directive is documented here: http://www.nasm.us/xdoc/2.13.01/html/nasmdoc5.html#section-5.2 Henrik Gramner (1): x86inc: AVX-512 support James Darnley (7): configure: test whether x86 assembler supports AVX-512 avutil: add AVX-512 flags avutil: detect when AVX-512 is available avutil: add alignment needed for AVX-512 x86inc: reduce difference to x264 upstream checkasm: support for AVX-512 functions avcodec/v210enc: add AVX-512 10-bit line pack function configure | 5 ++ libavcodec/x86/v210enc.asm | 5 ++ libavcodec/x86/v210enc_init.c | 7 ++ libavutil/cpu.c | 6 +- libavutil/cpu.h | 1 + libavutil/tests/cpu.c | 1 + libavutil/x86/cpu.c | 11 +++ libavutil/x86/cpu.h | 2 + libavutil/x86/x86inc.asm | 188 ++++++++++++++++++++++++++++++++++-------- tests/checkasm/checkasm.c | 1 + 10 files changed, 191 insertions(+), 36 deletions(-) -- 2.14.2 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
