OpenBLAS/driver/level2/trsv_L.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
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/*********************************************************************/

#include <stdio.h>
#include <ctype.h>
#include "common.h"

const static FLOAT dm1 = -1.;

#undef GEMV_UNROLL
#define GEMV_UNROLL DTB_ENTRIES

int CNAME(BLASLONG m, FLOAT *a, BLASLONG lda, FLOAT *b, BLASLONG incb, void *buffer){

  BLASLONG i, is, min_i;
  FLOAT *gemvbuffer = (FLOAT *)buffer;
  FLOAT *B = b;

  if (incb != 1) {
    B = buffer;
    gemvbuffer = (FLOAT *)(((BLASLONG)buffer + m * sizeof(FLOAT) + 4095) & ~4095);
    COPY_K(m, b, incb, buffer, 1);
  }

  for (is = 0; is < m; is += GEMV_UNROLL){

    min_i = MIN(m - is, GEMV_UNROLL);

#ifdef TRANSA
    if (is > 0){
      GEMV_T(is, min_i, 0, dm1,
	     a + is * lda ,  lda,
	     B,       1,
	     B +  is, 1, gemvbuffer);
    }
#endif

    for (i = 0; i < min_i; i++) {
      FLOAT *AA = a + is + (i + is) * lda;
      FLOAT *BB = B + is;

#ifdef TRANSA
      if (i > 0) BB[i] -= DOTU_K(i, AA, 1, BB, 1);
#endif

#ifndef UNIT
      BB[i] /= AA[i];
#endif

#ifndef TRANSA
      if (i < min_i - 1) {
	AXPYU_K(min_i - i  - 1 , 0, 0, - BB[i],
	       AA + i + 1, 1, BB + i + 1, 1, NULL, 0);
      }
#endif
    }

#ifndef TRANSA
    if (m - is > min_i){
      GEMV_N(m - is - min_i, min_i, 0, dm1,
	     a + is + min_i + is * lda,  lda,
	     B + is,            1,
	     B + (is + min_i),  1, gemvbuffer);
    }
#endif

  }

  if (incb != 1) {
    COPY_K(m, buffer, 1, b, incb);
  }

  return 0;
}