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

/* 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"

#ifndef USE_ALPHA

#define REAL_PART(a, b)  (a)

#define IMAGE_PART(a, b) (b)

#else

#define REAL_PART(a, b)  (alpha_r * (a) + alpha_i * (b))

#define IMAGE_PART(a, b) (alpha_i * (a) - alpha_r * (b))

#endif

#if defined(REAL_ONLY)

#define CMULT(a, b) (REAL_PART(a, b))

#elif defined(IMAGE_ONLY)

#define CMULT(a, b) (IMAGE_PART(a, b))

#else

#define CMULT(a, b) (REAL_PART(a, b) + IMAGE_PART(a, b))

#endif

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

#ifdef USE_ALPHA

	   FLOAT alpha_r, FLOAT alpha_i,

#endif

	   FLOAT *b){

  BLASLONG i, js, offset;

  FLOAT data01, data02, data03, data04;

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

  lda *= 2;

  js = (n >> 2);

  while (js > 0){

    offset = posX - posY;

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

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

    if (offset > -2) ao3 = a + posY * 2 + (posX + 2) * lda; else ao3 = a + (posX + 2) * 2 + posY * lda;

    if (offset > -3) ao4 = a + posY * 2 + (posX + 3) * lda; else ao4 = a + (posX + 3) * 2 + posY * lda;

    i     = m;

    while (i > 0) {

      if (offset > 0) {

	data01 = CMULT(*(ao1 + 0), -*(ao1 + 1));

	data02 = CMULT(*(ao2 + 0), -*(ao2 + 1));

	data03 = CMULT(*(ao3 + 0), -*(ao3 + 1));

	data04 = CMULT(*(ao4 + 0), -*(ao4 + 1));

      } else

	if (offset < -3) {

	  data01 = CMULT(*(ao1 + 0), *(ao1 + 1));

	  data02 = CMULT(*(ao2 + 0), *(ao2 + 1));

	  data03 = CMULT(*(ao3 + 0), *(ao3 + 1));

	  data04 = CMULT(*(ao4 + 0), *(ao4 + 1));

	} else {

	  switch (offset) {

	  case  0 :

	    data01 = CMULT(*(ao1 + 0), ZERO);

	    data02 = CMULT(*(ao2 + 0), -*(ao2 + 1));

	    data03 = CMULT(*(ao3 + 0), -*(ao3 + 1));

	    data04 = CMULT(*(ao4 + 0), -*(ao4 + 1));

	    break;

	  case -1 :

	    data01 = CMULT(*(ao1 + 0), *(ao1 + 1));

	    data02 = CMULT(*(ao2 + 0), ZERO);

	    data03 = CMULT(*(ao3 + 0), -*(ao3 + 1));

	    data04 = CMULT(*(ao4 + 0), -*(ao4 + 1));

	    break;

	  case -2 :

	    data01 = CMULT(*(ao1 + 0), *(ao1 + 1));

	    data02 = CMULT(*(ao2 + 0), *(ao2 + 1));

	    data03 = CMULT(*(ao3 + 0), ZERO);

	    data04 = CMULT(*(ao4 + 0), -*(ao4 + 1));

	    break;

	  case -3 :

	    data01 = CMULT(*(ao1 + 0), *(ao1 + 1));

	    data02 = CMULT(*(ao2 + 0), *(ao2 + 1));

	    data03 = CMULT(*(ao3 + 0), *(ao3 + 1));

	    data04 = CMULT(*(ao4 + 0), ZERO);

	    break;

	  }

	}

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

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

      if (offset >  -2) ao3 += 2; else ao3 += lda;

      if (offset >  -3) ao4 += 2; else ao4 += lda;

      b[ 0] = data01;

      b[ 1] = data02;

      b[ 2] = data03;

      b[ 3] = data04;

      b += 4;

      offset --;

      i --;

    }

    posX += 4;

    js --;

  }

  if (n & 2) {

    offset = posX - posY;

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

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

    i     = m;

    while (i > 0) {

      if (offset > 0) {

	data01 = CMULT(*(ao1 + 0), -*(ao1 + 1));

	data02 = CMULT(*(ao2 + 0), -*(ao2 + 1));

      } else

	if (offset < -1) {

	  data01 = CMULT(*(ao1 + 0), *(ao1 + 1));

	  data02 = CMULT(*(ao2 + 0), *(ao2 + 1));

	} else {

	  switch (offset) {

	  case  0 :

	    data01 = CMULT(*(ao1 + 0), ZERO);

	    data02 = CMULT(*(ao2 + 0), -*(ao2 + 1));

	    break;

	  case -1 :

	    data01 = CMULT(*(ao1 + 0), *(ao1 + 1));

	    data02 = CMULT(*(ao2 + 0), ZERO);

	    break;

	  }

	}

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

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

      b[ 0] = data01;

      b[ 1] = data02;

      b += 2;

      offset --;

      i --;

    }

    posX += 2;

  }

  if (n & 1) {

    offset = posX - posY;

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

    i     = m;

    while (i > 0) {

      if (offset > 0) {

	data01 = CMULT(*(ao1 + 0), -*(ao1 + 1));

      } else

	if (offset < 0) {

	  data01 = CMULT(*(ao1 + 0), *(ao1 + 1));

	} else {

	    data01 = CMULT(*(ao1 + 0), ZERO);

	}

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

      b[ 0] = data01;

      b ++;

      offset --;

      i --;

    }

  }

  return 0;

}