OpenBLAS/kernel/generic/bf16_macros.h

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#if defined(BFLOAT16) && defined(BFLOAT16CONVERSION)
static float
bfloat16tof32 (bfloat16 value)
{
  blasint one = 1;
  float result;
  sbf16tos_(&one, &value, &one, &result, &one);
  return result;
}

#ifdef BGEMM
static bfloat16 f32tobfloat16(float value) {
  blasint one = 1;
  bfloat16 result;
  sbstobf16_(&one, &value, &one, &result, &one);
  return result;
}
#endif

#ifdef BGEMM
#define ALPHA bfloat16tof32(alpha)
#define BETA bfloat16tof32(beta)
#define BF16TOF32(x) (bfloat16tof32(x))
#define F32TOBF16(x) (f32tobfloat16(x))
#else
#define ALPHA alpha
#define BETA beta
#define BF16TOF32(x) (bfloat16tof32(x))
#define F32TOBF16(x) x
#endif
#else
#define ALPHA alpha
#define BETA beta
#define BF16TOF32(x) x
#define F32TOBF16(x) x
#endif