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

/* 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.                                                  */

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/*   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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/* 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){

  lda *= 2;

  BLASLONG i, js, offset;

  FLOAT data01, data02;

  FLOAT *ao1, *ao2;

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

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

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

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

      b[ 0] = data01;

      b[ 1] = data02;

      b += 2;

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

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

      b[ 0] = data01;

      b ++;

      offset --;

      i --;

    }

  }

  return 0;

}