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x86: check for AVX support

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This adds configure and runtime checks for AVX support on x86 CPUs.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard
2011-02-16 02:39:42 +00:00
parent 74d6871d62
commit 87f1355f9b
4 changed files with 19 additions and 1 deletions
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12
libavutil/x86/cpu.c
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@ -35,6 +35,9 @@
"=c" (ecx), "=d" (edx)\
: "0" (index));
#define xgetbv(index,eax,edx) \
__asm__ ("xgetbv" : "=a"(eax), "=d"(edx) : "c" (index))
/* Function to test if multimedia instructions are supported... */
int ff_get_cpu_flags_x86(void)
{
@ -93,6 +96,15 @@ int ff_get_cpu_flags_x86(void)
rval |= AV_CPU_FLAG_SSE4;
if (ecx & 0x00100000 )
rval |= AV_CPU_FLAG_SSE42;
#if HAVE_AVX
/* Check OXSAVE and AVX bits */
if ((ecx & 0x18000000) == 0x18000000) {
/* Check for OS support */
xgetbv(0, eax, edx);
if ((eax & 0x6) == 0x6)
rval |= AV_CPU_FLAG_AVX;
}
#endif
#endif
;
}