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

/* 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 "common.h"

int CNAME(BLASLONG m, BLASLONG n, FLOAT *a, BLASLONG lda, BLASLONG posX, BLASLONG posY, FLOAT *b){

  BLASLONG i, js;

  BLASLONG X;

  FLOAT data01, data02, data03, data04;

  FLOAT *ao1, *ao2;

  js = (n >> 1);

  if (js > 0){

    do {

      X = posX;

      if (posX <= posY) {

	ao1 = a + posX + (posY + 0) * lda;

	ao2 = a + posX + (posY + 1) * lda;

      } else {

	ao1 = a + posY + (posX + 0) * lda;

	ao2 = a + posY + (posX + 1) * lda;

      }

      i = (m >> 1);

      if (i > 0) {

	do {

	  if (X < posY) {

	    ao1 += 2;

	    ao2 += 2;

	    b   += 4;

	  } else 

	    if (X > posY) {

	      data01 = *(ao1 + 0);

	      data02 = *(ao1 + 1);

	      data03 = *(ao2 + 0);

	      data04 = *(ao2 + 1);

	      b[ 0] = data01;

	      b[ 1] = data02;

	      b[ 2] = data03;

	      b[ 3] = data04;

	      ao1 += 2 * lda;

	      ao2 += 2 * lda;

	      b += 4;

	    } else {

#ifdef UNIT	      

	      data03 = *(ao2 + 0);

	      b[ 0] = ONE;

	      b[ 1] = ZERO;

	      b[ 2] = data03;

	      b[ 3] = ONE;

#else

	      data01 = *(ao1 + 0);

	      data03 = *(ao2 + 0);

	      data04 = *(ao2 + 1);

	      b[ 0] = data01;

	      b[ 1] = ZERO;

	      b[ 2] = data03;

	      b[ 3] = data04;

#endif

	      ao1 += 2 * lda;

	      ao2 += 2 * lda;

	      b += 4;

	    }

	  X += 2;

	  i --;

	} while (i > 0);

      }

      if (m & 1) {

	if (X < posY) {

	  ao1 += 1;

	  ao2 += 1;

	  b += 2;

	} else 

	  if (X > posY) {

	    data01 = *(ao1 + 0);

	    data02 = *(ao1 + 1);

	    b[ 0] = data01;

	    b[ 1] = data02;

	    ao1 += lda;

	    b += 2;

	  } else {

#ifdef UNIT	      

	    b[ 0] = ONE;

	    b[ 1] = ZERO;

#else

	    data01 = *(ao1 + 0);

	    b[ 0] = data01;

	    b[ 1] = ZERO;

#endif

	    ao1 += lda;

	    b += 2;

	  }

      }

      posY += 2;

      js --;

    } while (js > 0);

  } /* End of main loop */

  if (n & 1){

    X = posX;

    if (posX <= posY) {

      ao1 = a + posX + (posY + 0) * lda;

    } else {

      ao1 = a + posY + (posX + 0) * lda;

    }

    i = m;

    if (m > 0) {

      do {

	if (X < posY) {

	  b += 1;

  	  ao1 += 1;

	} else

	  if (X > posY) {

	    data01 = *(ao1 + 0);

	    b[ 0] = data01;

	    b += 1;

	    ao1 += lda;

	  } else {

#ifdef UNIT

	    b[ 0] = ONE;

#else

	    data01 = *(ao1 + 0);

	    b[ 0] = data01;

#endif

	    b += 1;

	    ao1 += lda;

	  }

	X += 1;

	i --;

      } while (i > 0);

    }

  }

  return 0;

}