1176998Sphk/* Check if the OS supports executing AVX instructions.  */
2330449Seadler
3330449Seadler#define XCR_XFEATURE_ENABLED_MASK	0x0
4176998Sphk
5176998Sphk#define XSTATE_FP	0x1
6176998Sphk#define XSTATE_SSE	0x2
7176998Sphk#define XSTATE_YMM	0x4
8176998Sphk
9176998Sphkstatic int
10176998Sphkavx_os_support (void)
11176998Sphk{
12176998Sphk  unsigned int eax, edx;
13176998Sphk  unsigned int ecx = XCR_XFEATURE_ENABLED_MASK;
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15176998Sphk  __asm__ ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (ecx));
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17176998Sphk  return (eax & (XSTATE_SSE | XSTATE_YMM)) == (XSTATE_SSE | XSTATE_YMM);
18176998Sphk}
19176998Sphk