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x86: add detection for FMA3 instruction set

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Based on x264 code

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2014-02-22 04:54:01 +00:00
committed by Janne Grunau
parent 10b0161d78
commit 1b932eb150
5 changed files with 16 additions and 1 deletions
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5
libavutil/x86/cpu.c
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@@ -131,8 +131,11 @@ int ff_get_cpu_flags_x86(void)
if ((ecx & 0x18000000) == 0x18000000) {
/* Check for OS support */
xgetbv(0, eax, edx);
if ((eax & 0x6) == 0x6)
if ((eax & 0x6) == 0x6) {
rval |= AV_CPU_FLAG_AVX;
if (ecx & 0x00001000)
rval |= AV_CPU_FLAG_FMA3;
}
}
#if HAVE_AVX2
if (max_std_level >= 7) {