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

/* 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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/*                                                                   */

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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 "common.h"

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

  BLASLONG i, js, offset;

  FLOAT data01, data02, data03, data04;

  FLOAT *ao1, *ao2;

  lda *= 2;

  js = (n >> 1);

  while (js > 0){

    offset = posX - posY;

    if (offset >  0) ao1 = a + (posX + 0) * 2 + posY * lda; else ao1 = a + posY * 2 + (posX + 0) * lda;

    if (offset > -1) ao2 = a + (posX + 1) * 2 + posY * lda; else ao2 = a + posY * 2 + (posX + 1) * lda;

    i     = m;

    while (i > 0) {

      data01 = *(ao1 + 0);

      data02 = *(ao1 + 1);

      data03 = *(ao2 + 0);

      data04 = *(ao2 + 1);

      if (offset >   0) ao1 += lda; else ao1 += 2;

      if (offset >  -1) ao2 += lda; else ao2 += 2;

      if (offset > 0) {

	b[ 0] = data01;

	b[ 1] = data02;

	b[ 2] = data03;

	b[ 3] = data04;

      } else

	if (offset < -1) {

	  b[ 0] = data01;

	  b[ 1] = -data02;

	  b[ 2] = data03;

	  b[ 3] = -data04;

	} else {

	  switch (offset) {

	  case  0 :

	    b[ 0] = data01;

	    b[ 1] = ZERO;

	    b[ 2] = data03;

	    b[ 3] = data04;

	    break;

	  case -1 :

	    b[ 0] = data01;

	    b[ 1] = -data02;

	    b[ 2] = data03;

	    b[ 3] = ZERO;

	    break;

	  }

	}

      b += 4;

      offset --;

      i --;

    }

    posX += 2;

    js --;

  }

  if (n & 1) {

    offset = posX - posY;

    if (offset >  0) ao1 = a + (posX + 0) * 2 + posY * lda; else ao1 = a + posY * 2 + (posX + 0) * lda;

    i     = m;

    while (i > 0) {

      data01 = *(ao1 + 0);

      data02 = *(ao1 + 1);

      if (offset >   0) ao1 += lda; else ao1 += 2;

      if (offset > 0) {

	b[ 0] = data01;

	b[ 1] = data02;

      } else

	if (offset < 0) {

	  b[ 0] = data01;

	  b[ 1] = -data02;

	} else {

	    b[ 0] = data01;

	    b[ 1] = ZERO;

	}

      b += 2;

      offset --;

      i --;

    }

  }

  return 0;

}