ffmpeg | branch: master | James Darnley <jdarn...@obe.tv> | Thu Oct 26 19:51:02 2017 +0200| [4783a01c113b727164588ada47b3145ce5d2c367] | committer: James Darnley
avutil: detect when AVX-512 is available > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4783a01c113b727164588ada47b3145ce5d2c367 --- libavutil/x86/cpu.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/libavutil/x86/cpu.c b/libavutil/x86/cpu.c index f33088c8c7..8097b6d146 100644 --- a/libavutil/x86/cpu.c +++ b/libavutil/x86/cpu.c @@ -97,6 +97,7 @@ int ff_get_cpu_flags_x86(void) int max_std_level, max_ext_level, std_caps = 0, ext_caps = 0; int family = 0, model = 0; union { int i[3]; char c[12]; } vendor; + int xcr0_lo = 0, xcr0_hi = 0; if (!cpuid_test()) return 0; /* CPUID not supported */ @@ -132,8 +133,8 @@ int ff_get_cpu_flags_x86(void) /* Check OXSAVE and AVX bits */ if ((ecx & 0x18000000) == 0x18000000) { /* Check for OS support */ - xgetbv(0, eax, edx); - if ((eax & 0x6) == 0x6) { + xgetbv(0, xcr0_lo, xcr0_hi); + if ((xcr0_lo & 0x6) == 0x6) { rval |= AV_CPU_FLAG_AVX; if (ecx & 0x00001000) rval |= AV_CPU_FLAG_FMA3; @@ -147,6 +148,13 @@ int ff_get_cpu_flags_x86(void) #if HAVE_AVX2 if ((rval & AV_CPU_FLAG_AVX) && (ebx & 0x00000020)) rval |= AV_CPU_FLAG_AVX2; +#if HAVE_AVX512 /* F, CD, BW, DQ, VL */ + if ((xcr0_lo & 0xe0) == 0xe0) { /* OPMASK/ZMM state */ + if ((rval & AV_CPU_FLAG_AVX2) && (ebx & 0xd0030000) == 0xd0030000) + rval |= AV_CPU_FLAG_AVX512; + + } +#endif /* HAVE_AVX512 */ #endif /* HAVE_AVX2 */ /* BMI1/2 don't need OS support */ if (ebx & 0x00000008) { _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog
