OpenBLAS/test/compare_sgemm_sbgemm.c

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#include <stdio.h>
#include <stdint.h>
#include "../common.h"
#define SGEMM   BLASFUNC(sgemm)
#define SBGEMM   BLASFUNC(sbgemm)
typedef union
{
  unsigned short v;
  struct
  {
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
    unsigned short s:1;
    unsigned short e:8;
    unsigned short m:7;
#else
    unsigned short m:7;
    unsigned short e:8;
    unsigned short s:1;
#endif
  } bits;
} bfloat16_bits;

typedef union
{
  float v;
  struct
  {
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
    uint32_t s:1;
    uint32_t e:8;
    uint32_t m:23;
#else
    uint32_t m:23;
    uint32_t e:8;
    uint32_t s:1;
#endif
  } bits;
} float32_bits;

float
float16to32 (bfloat16_bits f16)
{
  float32_bits f32;
  f32.bits.s = f16.bits.s;
  f32.bits.e = f16.bits.e;
  f32.bits.m = (uint32_t) f16.bits.m << 16;
  return f32.v;
}

int
main (int argc, char *argv[])
{
  int m, n, k;
  int i, j, l;
  int x;
  int ret = 0;
  int loop = 100;
  char transA = 'N', transB = 'N';
  float alpha = 1.0, beta = 0.0;

  for (x = 0; x <= loop; x++)
    {
      m = k = n = x;
      float A[m * k];
      float B[k * n];
      float C[m * n];
      bfloat16_bits AA[m * k], BB[k * n];
      float DD[m * n], CC[m * n];

      for (j = 0; j < m; j++)
	{
	  for (i = 0; i < m; i++)
	    {
	      A[j * k + i] = ((FLOAT) rand () / (FLOAT) RAND_MAX) + 0.5;
	      B[j * k + i] = ((FLOAT) rand () / (FLOAT) RAND_MAX) + 0.5;
	      C[j * k + i] = 0;
	      AA[j * k + i].v = *(uint32_t *) & A[j * k + i] >> 16;
	      BB[j * k + i].v = *(uint32_t *) & B[j * k + i] >> 16;
	      CC[j * k + i] = 0;
	      DD[j * k + i] = 0;
	    }
	}
      SGEMM (&transA, &transB, &m, &n, &k, &alpha, A,
	     &m, B, &k, &beta, C, &m);
      SBGEMM (&transA, &transB, &m, &n, &k, &alpha, AA,
	      &m, BB, &k, &beta, CC, &m);
      for (i = 0; i < n; i++)
	for (j = 0; j < m; j++)
	  for (l = 0; l < k; l++)
	    if (fabs (CC[i * m + j] - C[i * m + j]) > 1.0)
	      ret++;
      if (transA == 'N' && transB == 'N')
	{
	  for (i = 0; i < n; i++)
	    for (j = 0; j < m; j++)
	      for (l = 0; l < k; l++)
		{
		  DD[i * m + j] +=
		    float16to32 (AA[l * m + j]) * float16to32 (BB[l + k * i]);
		}
	  for (i = 0; i < n; i++)
	    for (j = 0; j < m; j++)
	      for (l = 0; l < k; l++)
		if (CC[i * m + j] != DD[i * m + j])
		  ret++;
	}
    }
  if (ret != 0)
    fprintf (stderr, "FATAL ERROR SBGEMM - Return code: %d\n", ret);
  return ret;
}