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x86: add detection for Bit Manipulation Instruction sets 

Based on x264 code

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2014-02-22 04:54:02 +00:00 committed by Janne Grunau
parent 1b932eb150
commit d59fcdaff3
3 changed files with 21 additions and 8 deletions
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6
libavutil/cpu.c
View File

@ -90,6 +90,8 @@ int av_parse_cpu_flags(const char *s)
#define CPUFLAG_FMA3 (AV_CPU_FLAG_FMA3 | CPUFLAG_AVX)
#define CPUFLAG_FMA4 (AV_CPU_FLAG_FMA4 | CPUFLAG_AVX)
#define CPUFLAG_AVX2 (AV_CPU_FLAG_AVX2 | CPUFLAG_AVX)
#define CPUFLAG_BMI1 (AV_CPU_FLAG_BMI1)
#define CPUFLAG_BMI2 (AV_CPU_FLAG_BMI2 | CPUFLAG_BMI1)
static const AVOption cpuflags_opts[] = {
{ "flags" , NULL, 0, AV_OPT_TYPE_FLAGS, { .i64 = 0 }, INT64_MIN, INT64_MAX, .unit = "flags" },
#if ARCH_PPC
@ -111,6 +113,8 @@ int av_parse_cpu_flags(const char *s)
{ "fma3" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_FMA3 }, .unit = "flags" },
{ "fma4" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_FMA4 }, .unit = "flags" },
{ "avx2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_AVX2 }, .unit = "flags" },
{ "bmi1" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_BMI1 }, .unit = "flags" },
{ "bmi2" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_BMI2 }, .unit = "flags" },
{ "3dnow" , NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOW }, .unit = "flags" },
{ "3dnowext", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = CPUFLAG_3DNOWEXT }, .unit = "flags" },
{ "cmov", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AV_CPU_FLAG_CMOV }, .unit = "flags" },
@ -212,6 +216,8 @@ static const struct {
{ AV_CPU_FLAG_3DNOWEXT, "3dnowext" },
{ AV_CPU_FLAG_CMOV, "cmov" },
{ AV_CPU_FLAG_AVX2, "avx2" },
{ AV_CPU_FLAG_BMI1, "bmi1" },
{ AV_CPU_FLAG_BMI2, "bmi2" },
#endif
{ 0 }
};

2
libavutil/cpu.h
View File

@ -50,6 +50,8 @@
#define AV_CPU_FLAG_CMOV 0x1000 ///< i686 cmov
#define AV_CPU_FLAG_AVX2 0x8000 ///< AVX2 functions: requires OS support even if YMM registers aren't used
#define AV_CPU_FLAG_FMA3 0x10000 ///< Haswell FMA3 functions
#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_ALTIVEC 0x0001 ///< standard

21
libavutil/x86/cpu.c
View File

@ -137,17 +137,22 @@ int ff_get_cpu_flags_x86(void)
rval |= AV_CPU_FLAG_FMA3;
}
}
#if HAVE_AVX2
if (max_std_level >= 7) {
cpuid(7, eax, ebx, ecx, edx);
if (ebx&0x00000020)
rval |= AV_CPU_FLAG_AVX2;
/* TODO: BMI1/2 */
}
#endif /* HAVE_AVX2 */
#endif /* HAVE_AVX */
#endif /* HAVE_SSE */
}
if (max_std_level >= 7) {
cpuid(7, eax, ebx, ecx, edx);
#if HAVE_AVX2
if (ebx & 0x00000020)
rval |= AV_CPU_FLAG_AVX2;
#endif /* HAVE_AVX2 */
/* BMI1/2 don't need OS support */
if (ebx & 0x00000008) {
rval |= AV_CPU_FLAG_BMI1;
if (ebx & 0x00000100)
rval |= AV_CPU_FLAG_BMI2;
}
}
cpuid(0x80000000, max_ext_level, ebx, ecx, edx);