diff --git a/libavutil/x86/cpu.c b/libavutil/x86/cpu.c index 441b4695d5..7b13fcae91 100644 --- a/libavutil/x86/cpu.c +++ b/libavutil/x86/cpu.c @@ -146,21 +146,8 @@ 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) @@ -209,6 +196,10 @@ int ff_get_cpu_flags_x86(void) used unless explicitly disabled by checking AV_CPU_FLAG_AVXSLOW. */ if ((family == 0x15 || family == 0x16) && (rval & AV_CPU_FLAG_AVX)) rval |= AV_CPU_FLAG_AVXSLOW; + + /* Zen 3 and earlier have slow gather */ + if ((family <= 0x19) && (rval & AV_CPU_FLAG_AVX2)) + rval |= AV_CPU_FLAG_SLOW_GATHER; } /* XOP and FMA4 use the AVX instruction coding scheme, so they can't be @@ -248,6 +239,10 @@ int ff_get_cpu_flags_x86(void) if ((rval & AV_CPU_FLAG_SSSE3) && !(rval & AV_CPU_FLAG_SSE4) && family == 6 && model < 23) rval |= AV_CPU_FLAG_SSSE3SLOW; + + /* Haswell has slow gather */ + if ((rval & AV_CPU_FLAG_AVX2) && family == 6 && model < 70) + rval |= AV_CPU_FLAG_SLOW_GATHER; } #endif /* cpuid */