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

/* 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    */

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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;

  BLASLONG X;

  FLOAT data01, data02, data03, data04, data05, data06, data07, data08;

  FLOAT data09, data10, data11, data12, data13, data14, data15, data16;

  FLOAT *ao1, *ao2, *ao3, *ao4;

  js = (n >> 2);

  if (js > 0){

    do {

      X = posX;

      if (posX <= posY) {

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

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

	ao3 = a + posX + (posY + 2) * lda;

	ao4 = a + posX + (posY + 3) * lda;

      } else {

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

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

	ao3 = a + posY + (posX + 2) * lda;

	ao4 = a + posY + (posX + 3) * lda;

      }

      i = (m >> 2);

      if (i > 0) {

	do {

	  if (X < posY) {

	    ao1 += 4;

	    ao2 += 4;

	    ao3 += 4;

	    ao4 += 4;

	    b   += 16;

	  } else 

	    if (X > posY) {

	      data01 = *(ao1 + 0);

	      data02 = *(ao1 + 1);

	      data03 = *(ao1 + 2);

	      data04 = *(ao1 + 3);

	      data05 = *(ao2 + 0);

	      data06 = *(ao2 + 1);

	      data07 = *(ao2 + 2);

	      data08 = *(ao2 + 3);

	      data09 = *(ao3 + 0);

	      data10 = *(ao3 + 1);

	      data11 = *(ao3 + 2);

	      data12 = *(ao3 + 3);

	      data13 = *(ao4 + 0);

	      data14 = *(ao4 + 1);

	      data15 = *(ao4 + 2);

	      data16 = *(ao4 + 3);

	      b[ 0] = data01;

	      b[ 1] = data02;

	      b[ 2] = data03;

	      b[ 3] = data04;

	      b[ 4] = data05;

	      b[ 5] = data06;

	      b[ 6] = data07;

	      b[ 7] = data08;

	      b[ 8] = data09;

	      b[ 9] = data10;

	      b[10] = data11;

	      b[11] = data12;

	      b[12] = data13;

	      b[13] = data14;

	      b[14] = data15;

	      b[15] = data16;

	      ao1 += 4 * lda;

	      ao2 += 4 * lda;

	      ao3 += 4 * lda;

	      ao4 += 4 * lda;

	      b += 16;

	    } else {

#ifdef UNIT	      

	      data05 = *(ao2 + 0);

	      data09 = *(ao3 + 0);

	      data10 = *(ao3 + 1);

	      data13 = *(ao4 + 0);

	      data14 = *(ao4 + 1);

	      data15 = *(ao4 + 2);

	      b[ 0] = ONE;

	      b[ 1] = ZERO;

	      b[ 2] = ZERO;

	      b[ 3] = ZERO;

	      b[ 4] = data05;

	      b[ 5] = ONE;

	      b[ 6] = ZERO;

	      b[ 7] = ZERO;

	      b[ 8] = data09;

	      b[ 9] = data10;

	      b[10] = ONE;

	      b[11] = ZERO;

	      b[12] = data13;

	      b[13] = data14;

	      b[14] = data15;

	      b[15] = ONE;

#else

	      data01 = *(ao1 + 0);

	      data05 = *(ao2 + 0);

	      data06 = *(ao2 + 1);

	      data09 = *(ao3 + 0);

	      data10 = *(ao3 + 1);

	      data11 = *(ao3 + 2);

	      data13 = *(ao4 + 0);

	      data14 = *(ao4 + 1);

	      data15 = *(ao4 + 2);

	      data16 = *(ao4 + 3);

	      b[ 0] = data01;

	      b[ 1] = ZERO;

	      b[ 2] = ZERO;

	      b[ 3] = ZERO;

	      b[ 4] = data05;

	      b[ 5] = data06;

	      b[ 6] = ZERO;

	      b[ 7] = ZERO;

	      b[ 8] = data09;

	      b[ 9] = data10;

	      b[10] = data11;

	      b[11] = ZERO;

	      b[12] = data13;

	      b[13] = data14;

	      b[14] = data15;

	      b[15] = data16;

#endif

	      ao1 += 4 * lda;

	      ao2 += 4 * lda;

	      ao3 += 4 * lda;

	      ao4 += 4 * lda;

	      b += 16;

	    }

	  X += 4;

	  i --;

	} while (i > 0);

      }

      i = (m & 3);

      if (i) {

	if (X < posY) {

	  if (m & 2) {

	    ao1 += 2;

	    ao2 += 2;

	    ao3 += 2;

	    ao4 += 2;

	    b += 8;

	  }

	  if (m & 1) {

	    ao1 += 1;

	    ao2 += 1;

	    ao3 += 1;

	    ao4 += 1;

	    b += 4;

	  }

	} else 

	  if (X > posY) {

	    if (m & 2) {

	      data01 = *(ao1 + 0);

	      data02 = *(ao1 + 1);

	      data03 = *(ao1 + 2);

	      data04 = *(ao1 + 3);

	      data05 = *(ao2 + 0);

	      data06 = *(ao2 + 1);

	      data07 = *(ao2 + 2);

	      data08 = *(ao2 + 3);

	      b[ 0] = data01;

	      b[ 1] = data02;

	      b[ 2] = data03;

	      b[ 3] = data04;

	      b[ 4] = data05;

	      b[ 5] = data06;

	      b[ 6] = data07;

	      b[ 7] = data08;

	      ao1 += 2 * lda;

	      ao2 += 2 * lda;

	      b   += 8;

	    }

	    if (m & 1) {

	      data01 = *(ao1 + 0);

	      data02 = *(ao1 + 1);

	      data03 = *(ao1 + 2);

	      data04 = *(ao1 + 3);

	      b[ 0] = data01;

	      b[ 1] = data02;

	      b[ 2] = data03;

	      b[ 3] = data04;

	      ao1 += lda;

	      b += 4;

	    }

	  } else {

#ifdef UNIT	      

	    if (i >= 2) {

	      data05 = *(ao2 + 0);

	    }

	    if (i >= 3) {

	      data09 = *(ao3 + 0);

	      data10 = *(ao3 + 1);

	    }

	    b[ 0] = ONE;

	    b[ 1] = ZERO;

	    b[ 2] = ZERO;

	    b[ 3] = ZERO;

	    b += 4;

	    if(i >= 2) {

	      b[ 0] = data05;

	      b[ 1] = ONE;

	      b[ 2] = ZERO;

	      b[ 3] = ZERO;

	      b += 4;

	    }

	    if (i >= 3) {

	      b[ 0] = data09;

	      b[ 1] = data10;

	      b[ 2] = ONE;

	      b[ 3] = ZERO;

	      b += 4;

	    }

#else

	    data01 = *(ao1 + 0);

	    if (i >= 2) {

	      data05 = *(ao2 + 0);

	      data06 = *(ao2 + 1);

	    }

	    if (i >= 3) {

	      data09 = *(ao3 + 0);

	      data10 = *(ao3 + 1);

	      data11 = *(ao3 + 2);

	    }

	    b[ 0] = data01;

	    b[ 1] = ZERO;

	    b[ 2] = ZERO;

	    b[ 3] = ZERO;

	    b += 4;

	    if(i >= 2) {

	      b[ 0] = data05;

	      b[ 1] = data06;

	      b[ 2] = ZERO;

	      b[ 3] = ZERO;

	      b += 4;

	    }

	    if (i >= 3) {

	      b[ 0] = data09;

	      b[ 1] = data10;

	      b[ 2] = data11;

	      b[ 3] = ZERO;

	      b += 4;

	    }

#endif

	  }

      }

      posY += 4;

      js --;

    } while (js > 0);

  } /* End of main loop */

  if (n & 2){

      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);

	      data05 = *(ao2 + 0);

	      data06 = *(ao2 + 1);

	      b[ 0] = data01;

	      b[ 1] = data02;

	      b[ 2] = data05;

	      b[ 3] = data06;

	      ao1 += 2 * lda;

	      ao2 += 2 * lda;

	      b += 4;

	    } else {

#ifdef UNIT

	      data05 = *(ao2 + 0);

	      b[ 0] = ONE;

	      b[ 1] = ZERO;

	      b[ 2] = data05;

	      b[ 3] = ONE;

#else

	      data01 = *(ao1 + 0);

	      data05 = *(ao2 + 0);

	      data06 = *(ao2 + 1);

	      b[ 0] = data01;

	      b[ 1] = ZERO;

	      b[ 2] = data05;

	      b[ 3] = data06;

#endif

	      ao1 += 2 * lda;

	      ao2 += 2 * lda;

      	      b += 4;

	    }

	  X += 2;

	  i --;

	} while (i > 0);

      }

      i = (m & 1);

      if (i) {

	if (X < posY) {

	  ao1 += 2;

	  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

	    b += 2;

	  }

      }

      posY += 2;

  }

  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;

	      ao1 += lda;

	      b += 1;

	    } else {

#ifdef UNIT

	      b[ 0] = ONE;

#else

	      data01 = *(ao1 + 0);

	      b[ 0] = data01;

#endif

	      ao1 += lda;

	      b += 1;

	    }

	  X += 1;

	  i --;

	} while (i > 0);

      }

  }

  return 0;

}