OpenBLAS/kernel/generic/zgemm3m_ncopy_4.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
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#include <stdio.h>
#include "common.h"

#ifndef USE_ALPHA
#define REAL_PART(a, b)  (a)
#define IMAGE_PART(a, b) (b)
#else
#define REAL_PART(a, b)  (alpha_r * (a) - alpha_i * (b))
#define IMAGE_PART(a, b) (alpha_i * (a) + alpha_r * (b))
#endif

#if defined(REAL_ONLY)
#define CMULT(a, b) (REAL_PART(a, b))
#elif defined(IMAGE_ONLY)
#define CMULT(a, b) (IMAGE_PART(a, b))
#else
#define CMULT(a, b) (REAL_PART(a, b) + IMAGE_PART(a, b))
#endif

int CNAME(BLASLONG m, BLASLONG n, FLOAT *a, BLASLONG lda,
#ifdef USE_ALPHA
	   FLOAT alpha_r, FLOAT alpha_i,
#endif
	   FLOAT *b){

  BLASLONG i, j;

  FLOAT *a_offset, *a_offset1, *a_offset2, *a_offset3, *a_offset4;
  FLOAT *b_offset;
  FLOAT a1, a2, a3, a4, a5, a6, a7, a8;

/* silence compiler warnings about unused-but-set variables:
   depending on compile-time arguments either the odd or the
   even-numbered variables will not be used */
   
  (void)a1;
  (void)a2;
  (void)a3;
  (void)a4;
  (void)a5;
  (void)a6;
  (void)a7;
  (void)a8;

  lda *= 2;

  a_offset = a;
  b_offset = b;

  j = (n >> 2);
  if (j > 0){
    do{
      a_offset1  = a_offset;
      a_offset2  = a_offset1 + lda;
      a_offset3  = a_offset2 + lda;
      a_offset4  = a_offset3 + lda;
      a_offset += 4 * lda;

      for (i = 0; i < m; i ++) {

	a1 = *(a_offset1 + 0);
	a2 = *(a_offset1 + 1);
	a3 = *(a_offset2 + 0);
	a4 = *(a_offset2 + 1);
	a5 = *(a_offset3 + 0);
	a6 = *(a_offset3 + 1);
	a7 = *(a_offset4 + 0);
	a8 = *(a_offset4 + 1);

	*(b_offset +  0) = CMULT(a1, a2);
	*(b_offset +  1) = CMULT(a3, a4);
	*(b_offset +  2) = CMULT(a5, a6);
	*(b_offset +  3) = CMULT(a7, a8);

	a_offset1 += 2;
	a_offset2 += 2;
	a_offset3 += 2;
	a_offset4 += 2;

	b_offset +=  4;

      }

      j--;
    }while(j > 0);
  } /* end of if(j > 0) */

  if (n & 2) {
    a_offset1  = a_offset;
    a_offset2  = a_offset1 + lda;
    a_offset += 2 * lda;

      for (i = 0; i < m; i ++) {

	a1 = *(a_offset1 + 0);
	a2 = *(a_offset1 + 1);
	a3 = *(a_offset2 + 0);
	a4 = *(a_offset2 + 1);

	*(b_offset +  0) = CMULT(a1, a2);
	*(b_offset +  1) = CMULT(a3, a4);

	a_offset1 += 2;
	a_offset2 += 2;

	b_offset +=  2;

      }
  }

  if (n & 1) {
    a_offset1  = a_offset;

    for (i = 0; i < m; i ++) {

      a1 = *(a_offset1 + 0);
      a2 = *(a_offset1 + 1);

      *(b_offset +  0) = CMULT(a1, a2);

      a_offset1 += 2;

      b_offset +=  1;
    }
  }

  return 0;
}