gcc/testsuite/gcc.target/i386/avx-os-support.h

   1 /* Check if the OS supports executing AVX instructions.  */
   2
   3 #define XCR_XFEATURE_ENABLED_MASK       0x0
   4
   5 #define XSTATE_FP       0x1
   6 #define XSTATE_SSE      0x2
   7 #define XSTATE_YMM      0x4
   8
   9 static int
  10 avx_os_support (void)
  11 {
  12   unsigned int eax, edx;
  13   unsigned int ecx = XCR_XFEATURE_ENABLED_MASK;
  14
  15   __asm__ ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (ecx));
  16
  17   return (eax & (XSTATE_SSE | XSTATE_YMM)) == (XSTATE_SSE | XSTATE_YMM);
  18 }