/*********************************************************************/
/* 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,    */
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/* interpreted as representing official policies, either expressed   */
/* or implied, of The University of Texas at Austin.                 */
/*********************************************************************/

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

#define a2	(a1 + 1)

int CNAME(BLASLONG n, BLASLONG k1, BLASLONG k2, FLOAT *a, BLASLONG lda, blasint *ipiv, FLOAT *buffer){

  BLASLONG i, j, ip1, ip2;
  blasint *piv;
  FLOAT *a1;
  FLOAT *b1, *b2;
  FLOAT A1, A2, B1, B2;

  a--;
  k1 --;

  ipiv += k1;

  if (n  <= 0) return 0;


  j = n;
  do {
    piv = ipiv;

    a1 = a + k1 + 1;

    ip1 = *(piv + 0);
    ip2 = *(piv + 1);
    piv += 2;

    b1 = a + ip1;
    b2 = a + ip2;

    i = ((k2 - k1) >> 1);

    if (i > 0) {
      do {
	A1 = *a1;
	A2 = *a2;
	B1 = *b1;
	B2 = *b2;

	ip1 = *(piv + 0);
	ip2 = *(piv + 1);
	piv += 2;

	if (b1 == a1) {
	    if (b2 == a2) {
	      *(buffer + 0) = A1;
	      *(buffer + 1) = A2;
	    } else {
	      *(buffer + 0) = A1;
	      *(buffer + 1) = B2;

	      *b2 = A2;
	    }
	} else
	  if (b1 == a2) {
	      if (b2 == a2) {
		*(buffer + 0) = A2;
		*(buffer + 1) = A1;
	      } else {
		*(buffer + 0) = A2;
		*(buffer + 1) = B2;
		*b2 = A1;
	      }
	  } else {
	      if (b2 == a2) {
		*(buffer + 0) = B1;
		*(buffer + 1) = A2;
		*b1 = A1;
	      } else
		if (b2 == b1) {
		  *(buffer + 0) = B1;
		  *(buffer + 1) = A1;
		  *b1 = A2;
		} else {
		  *(buffer + 0) = B1;
		  *(buffer + 1) = B2;
		  *b1 = A1;
		  *b2 = A2;
		}
	  }

	buffer += 2;

	b1 = a + ip1;
	b2 = a + ip2;

	a1 += 2;

	i --;
      } while (i > 0);
    }

    i = ((k2 - k1) & 1);

    if (i > 0) {
      A1 = *a1;
      B1 = *b1;

      if (a1 == b1) {
	*(buffer + 0) = A1;
      } else {
	*(buffer + 0) = B1;
	*b1 = A1;
      }
    }
    a += lda;
    j --;
  } while (j > 0);

  return 0;
}