/*********************************************************************/

/* 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:                                               */

/*                                                                   */

/*   1. Redistributions of source code must retain the above         */

/*      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    */

/*    MERCHANTABILITY  AND FITNESS FOR  A PARTICULAR  PURPOSE ARE    */

/*    DISCLAIMED.  IN  NO EVENT SHALL THE UNIVERSITY  OF TEXAS AT    */

/*    AUSTIN OR CONTRIBUTORS BE  LIABLE FOR ANY DIRECT, INDIRECT,    */

/*    INCIDENTAL,  SPECIAL, EXEMPLARY,  OR  CONSEQUENTIAL DAMAGES    */

/*    (INCLUDING, BUT  NOT LIMITED TO,  PROCUREMENT OF SUBSTITUTE    */

/*    GOODS  OR  SERVICES; LOSS  OF  USE,  DATA,  OR PROFITS;  OR    */

/*    BUSINESS INTERRUPTION) HOWEVER CAUSED  AND ON ANY THEORY OF    */

/*    LIABILITY, WHETHER  IN CONTRACT, STRICT  LIABILITY, OR TORT    */

/*    (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING IN ANY WAY OUT    */

/*    OF  THE  USE OF  THIS  SOFTWARE,  EVEN  IF ADVISED  OF  THE    */

/*    POSSIBILITY OF SUCH DAMAGE.                                    */

/*                                                                   */

/* The views and conclusions contained in the software and           */

/* documentation are those of the authors and should not be          */

/* interpreted as representing official policies, either expressed   */

/* or implied, of The University of Texas at Austin.                 */

/*********************************************************************/

#include <stdio.h></stdio.h>

#include <math.h></math.h>

#include "common.h"

static FLOAT dm1 = -1.;

static FLOAT dp1 =  1.;

#ifndef SQRT

#define SQRT(x)	sqrt(x)

#endif

blasint CNAME(blas_arg_t *args, BLASLONG *range_m, BLASLONG *range_n, FLOAT *sa, FLOAT *sb, BLASLONG myid) {

  BLASLONG n, lda;

  FLOAT *a;

  FLOAT ajj;

  FLOAT *aoffset;

  BLASLONG i, j;

  n      = args -> n;

  a      = (FLOAT *)args -> a;

  lda    = args -> lda;

  if (range_n) {

    n      = range_n[1] - range_n[0];

    a     += range_n[0] * (lda + 1) * COMPSIZE;

  }

  aoffset = a;

  for (j = 0; j < n; j++) {

    ajj = *(aoffset + j) - DOTU_K(j, a + j, lda, a + j, lda);

    if (ajj <= 0){

      *(aoffset + j) = ajj;

      return j + 1;

    }

    ajj = SQRT(ajj);

    *(aoffset + j) = ajj;

    i = n - j - 1;

    if (i > 0) {

      GEMV_N(i, j, 0, dm1, 

	     a + j + 1, lda,

	     a + j, lda,

	     aoffset + j + 1, 1, sb);

      SCAL_K(i, 0, 0, dp1 / ajj,

	     aoffset + j + 1, 1, NULL, 0, NULL, 0);

    }

    aoffset += lda;

  }

  return 0;

}