OpenBLAS/driver/level2/tpsv_U.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
/* All rights reserved.                                              */
/*                                                                   */
/* Redistribution and use in source and binary forms, with or        */
/* without modification, are permitted provided that the following   */
/* conditions are met:                                               */
/*                                                                   */
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/*      copyright notice, this list of conditions and the following  */
/*      disclaimer.                                                  */
/*                                                                   */
/*   2. Redistributions in binary form must reproduce the above      */
/*      copyright notice, this list of conditions and the following  */
/*      disclaimer in the documentation and/or other materials       */
/*      provided with the distribution.                              */
/*                                                                   */
/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
/*    AUSTIN  ``AS IS''  AND ANY  EXPRESS OR  IMPLIED WARRANTIES,    */
/*    INCLUDING, BUT  NOT LIMITED  TO, THE IMPLIED  WARRANTIES OF    */
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/*********************************************************************/

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

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

  BLASLONG i;
  FLOAT *B = b;

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

  a += (m + 1) * m / 2 - 1;

  for (i = 0; i < m; i++) {
#ifdef TRANSA
    if (i > 0) B[m - i - 1] -= DOTU_K(i, a + 1, 1, B + m - i, 1);
#endif

#ifndef UNIT
    B[m - i - 1] /= a[0];
#endif

#ifndef TRANSA
    if (i < m - 1) AXPYU_K(m - i - 1, 0, 0, -B[m - i - 1], a - (m - i - 1), 1, B, 1, NULL, 0);
#endif

#ifndef TRANSA
    a -= (m - i);
#else
    a -= (i + 2);
#endif
  }

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

  return 0;
}