gcc/testsuite/gcc.target/x86_64/abi/avx512fp16/avx512fp16-check.h

#include <stdlib.h>
#include <cpuid.h>

/* Check if the OS supports executing AVX512FP16 instructions.  */

#define XCR_XFEATURE_ENABLED_MASK	0x0

#define XSTATE_FP	0x1
#define XSTATE_SSE	0x2
#define XSTATE_YMM	0x4
#define XSTATE_OPMASK	0x20
#define XSTATE_ZMM	0x40
#define XSTATE_HI_ZMM	0x80

static int
check_osxsave (void)
{
  unsigned int eax, ebx, ecx, edx;

  if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
    return 0;

  return (ecx & bit_OSXSAVE) != 0;
}

static int
avx512fp16_os_support (void)
{
  unsigned int eax, edx;
  unsigned int ecx = XCR_XFEATURE_ENABLED_MASK;
  unsigned int mask = XSTATE_MASK;

  if (!check_osxsave ())
    return 0;

  __asm__ ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (ecx));

  return ((eax & mask) == mask);
}

static void do_test (void);

int
main ()
{
  unsigned int eax, ebx, ecx, edx;

  if (!avx512fp16_os_support ())
    return 0;

  if (__get_cpuid_max (0, NULL) < 7)
    return 0;

  __cpuid_count (7, 0, eax, ebx, ecx, edx);

    /* Run AVX512FP16 test only if host has ISA support.  */
  if (((ebx & (bit_AVX512F | bit_AVX512BW))
       == (bit_AVX512F | bit_AVX512BW))
      && (edx & bit_AVX512FP16)
      && AVX512VL (ebx))
    {
      do_test ();
#ifdef DEBUG
      printf ("PASSED\n");
#endif
      return 0;
    }

#ifdef DEBUG
  printf ("SKIPPED\n");
#endif

  return 0;
}