OpenBLAS/kernel/generic/trsm_ltcopy_16.c

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

#ifndef UNIT
#define INV(a) (ONE / (a))
#else
#define INV(a) (ONE)
#endif

int CNAME(BLASLONG m, BLASLONG n, FLOAT *a, BLASLONG lda, BLASLONG offset, FLOAT *b){

  BLASLONG i, ii, j, jj, k;

  FLOAT *a1;

  jj = offset;

  j = (n >> 4);
  while (j > 0){

    a1 = a;
    a += 16;
    ii = 0;

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

      if ((ii >= jj ) && (ii - jj < 16)) {

	*(b +  ii - jj) = INV(*(a1 + ii - jj));

	for (k = ii - jj + 1; k < 16; k ++) {
	  *(b +  k) = *(a1 +  k);
	}

      }

      if (ii - jj < 0) {
	*(b +  0) = *(a1 +  0);
	*(b +  1) = *(a1 +  1);
	*(b +  2) = *(a1 +  2);
	*(b +  3) = *(a1 +  3);
	*(b +  4) = *(a1 +  4);
	*(b +  5) = *(a1 +  5);
	*(b +  6) = *(a1 +  6);
	*(b +  7) = *(a1 +  7);
	*(b +  8) = *(a1 +  8);
	*(b +  9) = *(a1 +  9);
	*(b + 10) = *(a1 + 10);
	*(b + 11) = *(a1 + 11);
	*(b + 12) = *(a1 + 12);
	*(b + 13) = *(a1 + 13);
	*(b + 14) = *(a1 + 14);
	*(b + 15) = *(a1 + 15);
      }

      b  += 16;
      a1 += lda;
      ii ++;
    }

    jj += 16;
    j --;
  }

  j = (n & 8);
  if (j > 0) {
    a1 = a;
    a += 8;
    ii = 0;

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

      if ((ii >= jj ) && (ii - jj < 8)) {

	*(b +  ii - jj) = INV(*(a1 + ii - jj));

	for (k = ii - jj + 1; k < 8; k ++) {
	  *(b +  k) = *(a1 +  k);
	}

      }

      if (ii - jj < 0) {
	*(b +  0) = *(a1 +  0);
	*(b +  1) = *(a1 +  1);
	*(b +  2) = *(a1 +  2);
	*(b +  3) = *(a1 +  3);
	*(b +  4) = *(a1 +  4);
	*(b +  5) = *(a1 +  5);
	*(b +  6) = *(a1 +  6);
	*(b +  7) = *(a1 +  7);
      }

      b  += 8;
      a1 += lda;
      ii ++;
    }

    jj += 8;
  }

  j = (n & 4);
  if (j > 0) {

    a1 = a;
    a += 4;
    ii = 0;

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

      if ((ii >= jj ) && (ii - jj < 4)) {
	*(b +  ii - jj) = INV(*(a1 + ii - jj));

	for (k = ii - jj + 1; k < 4; k ++) {
	  *(b +  k) = *(a1 +  k);
	}

      }

      if (ii - jj < 0) {
	*(b +  0) = *(a1 +  0);
	*(b +  1) = *(a1 +  1);
	*(b +  2) = *(a1 +  2);
	*(b +  3) = *(a1 +  3);
      }

      b  += 4;
      a1 += lda;
      ii ++;
    }

    jj += 4;
  }

  j = (n & 2);
  if (j > 0) {

    a1 = a;
    a += 2;
    ii = 0;

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

      if ((ii >= jj ) && (ii - jj < 2)) {

	*(b +  ii - jj) = INV(*(a1 + ii - jj));

	for (k = ii - jj + 1; k < 2; k ++) {
	  *(b +  k) = *(a1 +  k);
	}

      }

      if (ii - jj < 0) {
	*(b +  0) = *(a1 +  0);
	*(b +  1) = *(a1 +  1);
      }

      b  += 2;
      a1 += lda;
      ii ++;
    }

    jj += 2;
  }

  j = (n & 1);
  if (j > 0) {

    a1 = a;
    ii = 0;

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

      if ((ii >= jj ) && (ii - jj < 1)) {
	*(b +  ii - jj) = INV(*(a1 + ii - jj));
      }

      if (ii - jj < 0) {
	*(b +  0) = *(a1 +  0);
      }

      b  += 1;
      a1 += lda;
      ii ++;
    }
  }

  return 0;
}