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/*********************************************************************/
/* 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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/*   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    */
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/*    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>
#include <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;
  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;
  }

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

    ajj = *(a + j) - DOTU_K(j, a, 1, a, 1);

    if (ajj <= 0){
      *(a + j) = ajj;
      return j + 1;
    }
    ajj = SQRT(ajj);
    *(a + j)  = ajj;

    i = n - j - 1;

    if (i > 0) {
      GEMV_T(j, i, 0, dm1, 
	     a + lda, lda,
	     a, 1,
	     a + j + lda, lda, sb);
      
      SCAL_K(i, 0, 0, dp1 / ajj,
	     a + j + lda, lda, NULL, 0, NULL, 0);
    }

    a += lda;
  }

  return 0;
}