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| author | Alan Kelly <alankelly-at-google.com@ffmpeg.org> | 2021-12-21 20:56:41 +0100 |
|---|---|---|
| committer | James Almer <jamrial@gmail.com> | 2021-12-21 17:44:44 -0300 |
| commit | ffbab99f2c22be06ef3c564fd38320d40e48a2b5 (patch) | |
| tree | 1fe8ee8fadcd36aab7fba56c03801f893e4e7d76 /libavutil/x86/cpu.c | |
| parent | 14b6805eb29d193105998e530e92525d7fe98d6d (diff) | |
| download | ffmpeg-ffbab99f2c22be06ef3c564fd38320d40e48a2b5.tar.gz | |
libavutil/cpu: Add AV_CPU_FLAG_SLOW_GATHER.
This flag is set on Haswell and earlier and all AMD cpus.
Diffstat (limited to 'libavutil/x86/cpu.c')
| -rw-r--r-- | libavutil/x86/cpu.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/libavutil/x86/cpu.c b/libavutil/x86/cpu.c index bcd41a50a2..441b4695d5 100644 --- a/libavutil/x86/cpu.c +++ b/libavutil/x86/cpu.c @@ -146,8 +146,21 @@ int ff_get_cpu_flags_x86(void) if (max_std_level >= 7) { cpuid(7, eax, ebx, ecx, edx); #if HAVE_AVX2 - if ((rval & AV_CPU_FLAG_AVX) && (ebx & 0x00000020)) + if ((rval & AV_CPU_FLAG_AVX) && (ebx & 0x00000020)) { rval |= AV_CPU_FLAG_AVX2; + cpuid(1, eax, ebx, ecx, std_caps); + family = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff); + model = ((eax >> 4) & 0xf) + ((eax >> 12) & 0xf0); + /* Haswell has slow gather */ + if (!strncmp(vendor.c, "GenuineIntel", 12)) + if (family == 6 && model < 70) + rval |= AV_CPU_FLAG_SLOW_GATHER; + /* Zen 3 and earlier have slow gather */ + if (!strncmp(vendor.c, "AuthenticAMD", 12)) + if (family <= 0x19) + rval |= AV_CPU_FLAG_SLOW_GATHER; + } + #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) |