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libavutil/cpu: Add AV_CPU_FLAG_SLOW_GATHER. 

This flag is set on Haswell and earlier and all AMD cpus.
This commit is contained in:
Alan Kelly 2021-12-21 20:56:41 +01:00 committed by James Almer
parent 14b6805eb2
commit ffbab99f2c
4 changed files with 20 additions and 3 deletions
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3
doc/APIchanges
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@ -14,6 +14,9 @@ libavutil: 2021-04-27
API changes, most recent first:
2021-12-21 - xxxxxxxxxx - lavu 57.12.100 - cpu.h
Add AV_CPU_FLAG_SLOW_GATHER.
2021-12-20 - xxxxxxxxxx - lavu 57.11.101 - display.h
Modified the documentation of av_display_rotation_set()
to match its longstanding actual behaviour of treating

1
libavutil/cpu.h
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@ -54,6 +54,7 @@
#define AV_CPU_FLAG_BMI1 0x20000 ///< Bit Manipulation Instruction Set 1
#define AV_CPU_FLAG_BMI2 0x40000 ///< Bit Manipulation Instruction Set 2
#define AV_CPU_FLAG_AVX512 0x100000 ///< AVX-512 functions: requires OS support even if YMM/ZMM registers aren't used
#define AV_CPU_FLAG_SLOW_GATHER 0x2000000 ///< CPU has slow gathers.
#define AV_CPU_FLAG_ALTIVEC 0x0001 ///< standard
#define AV_CPU_FLAG_VSX 0x0002 ///< ISA 2.06

4
libavutil/version.h
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@ -79,8 +79,8 @@
*/
#define LIBAVUTIL_VERSION_MAJOR 57
#define LIBAVUTIL_VERSION_MINOR 11
#define LIBAVUTIL_VERSION_MICRO 101
#define LIBAVUTIL_VERSION_MINOR 12
#define LIBAVUTIL_VERSION_MICRO 100
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
LIBAVUTIL_VERSION_MINOR, \

15
libavutil/x86/cpu.c
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@ -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)