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

/* 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.                                                  */

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/*   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    */

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/* 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.;

#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[2];

  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[0] = DOTC_K(j, a + j * 2, lda, a + j * 2, lda);

    GET_IMAGE(ajj[1]);

    ajj[0] = *(aoffset + j * 2) - ajj[0];

    if (ajj[0] <= 0){

      *(aoffset + j * 2 + 0) = ajj[0];

      *(aoffset + j * 2 + 1) = ZERO;

      return j + 1;

    }

    ajj[0] = SQRT(ajj[0]);

    *(aoffset + j * 2 + 0) = ajj[0];

    *(aoffset + j * 2 + 1) = ZERO;

    i = n - j - 1;

    if (i > 0) {

      GEMV_O(i, j, 0, dm1, ZERO,

	      a + (j + 1) * 2, lda,

	      a + j * 2, lda,

	      aoffset + (j + 1) * 2, 1, sb);

      SCAL_K(i, 0, 0, ONE / ajj[0], ZERO,

	      aoffset + (j + 1) * 2, 1, NULL, 0, NULL, 0);

    }

    aoffset += lda * 2;

  }

  return 0;

}