/*********************************************************************/
/*                                                                   */
/*             Optimized BLAS libraries                              */
/*                     By Kazushige Goto <kgoto@tacc.utexas.edu>     */
/*                                                                   */
/* Copyright (c) The University of Texas, 2009. All rights reserved. */
/* UNIVERSITY EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES CONCERNING  */
/* THIS SOFTWARE AND DOCUMENTATION, INCLUDING ANY WARRANTIES OF      */
/* MERCHANTABILITY, FITNESS FOR ANY PARTICULAR PURPOSE,              */
/* NON-INFRINGEMENT AND WARRANTIES OF PERFORMANCE, AND ANY WARRANTY  */
/* THAT MIGHT OTHERWISE ARISE FROM COURSE OF DEALING OR USAGE OF     */
/* TRADE. NO WARRANTY IS EITHER EXPRESS OR IMPLIED WITH RESPECT TO   */
/* THE USE OF THE SOFTWARE OR DOCUMENTATION.                         */
/* Under no circumstances shall University be liable for incidental, */
/* special, indirect, direct or consequential damages or loss of     */
/* profits, interruption of business, or related expenses which may  */
/* arise from use of Software or Documentation, including but not    */
/* limited to those resulting from defects in Software and/or        */
/* Documentation, or loss or inaccuracy of data of any kind.         */
/*********************************************************************/

#include <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, data05, data06, data07, data08;
  FLOAT *ao1, *ao2, *ao3, *ao4, *ao5, *ao6, *ao7, *ao8;

  lda *= 2;

  js = (n >> 3);
  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;
    if (offset > -2) ao3 = a + (posX + 2) * 2 + posY * lda; else ao3 = a + posY * 2 + (posX + 2) * lda;
    if (offset > -3) ao4 = a + (posX + 3) * 2 + posY * lda; else ao4 = a + posY * 2 + (posX + 3) * lda;
    if (offset > -4) ao5 = a + (posX + 4) * 2 + posY * lda; else ao5 = a + posY * 2 + (posX + 4) * lda;
    if (offset > -5) ao6 = a + (posX + 5) * 2 + posY * lda; else ao6 = a + posY * 2 + (posX + 5) * lda;
    if (offset > -6) ao7 = a + (posX + 6) * 2 + posY * lda; else ao7 = a + posY * 2 + (posX + 6) * lda;
    if (offset > -7) ao8 = a + (posX + 7) * 2 + posY * lda; else ao8 = a + posY * 2 + (posX + 7) * 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));
	data05 = CMULT(*(ao5 + 0), *(ao5 + 1));
	data06 = CMULT(*(ao6 + 0), *(ao6 + 1));
	data07 = CMULT(*(ao7 + 0), *(ao7 + 1));
	data08 = CMULT(*(ao8 + 0), *(ao8 + 1));
      } else
	if (offset < -7) {
	  data01 = CMULT(*(ao1 + 0), -*(ao1 + 1));
	  data02 = CMULT(*(ao2 + 0), -*(ao2 + 1));
	  data03 = CMULT(*(ao3 + 0), -*(ao3 + 1));
	  data04 = CMULT(*(ao4 + 0), -*(ao4 + 1));
	  data05 = CMULT(*(ao5 + 0), -*(ao5 + 1));
	  data06 = CMULT(*(ao6 + 0), -*(ao6 + 1));
	  data07 = CMULT(*(ao7 + 0), -*(ao7 + 1));
	  data08 = CMULT(*(ao8 + 0), -*(ao8 + 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));
	    data05 = CMULT(*(ao5 + 0), *(ao5 + 1));
	    data06 = CMULT(*(ao6 + 0), *(ao6 + 1));
	    data07 = CMULT(*(ao7 + 0), *(ao7 + 1));
	    data08 = CMULT(*(ao8 + 0), *(ao8 + 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));
	    data05 = CMULT(*(ao5 + 0), *(ao5 + 1));
	    data06 = CMULT(*(ao6 + 0), *(ao6 + 1));
	    data07 = CMULT(*(ao7 + 0), *(ao7 + 1));
	    data08 = CMULT(*(ao8 + 0), *(ao8 + 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));
	    data05 = CMULT(*(ao5 + 0), *(ao5 + 1));
	    data06 = CMULT(*(ao6 + 0), *(ao6 + 1));
	    data07 = CMULT(*(ao7 + 0), *(ao7 + 1));
	    data08 = CMULT(*(ao8 + 0), *(ao8 + 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);
	    data05 = CMULT(*(ao5 + 0), *(ao5 + 1));
	    data06 = CMULT(*(ao6 + 0), *(ao6 + 1));
	    data07 = CMULT(*(ao7 + 0), *(ao7 + 1));
	    data08 = CMULT(*(ao8 + 0), *(ao8 + 1));
	    break;
	  case -4 :
	    data01 = CMULT(*(ao1 + 0), -*(ao1 + 1));
	    data02 = CMULT(*(ao2 + 0), -*(ao2 + 1));
	    data03 = CMULT(*(ao3 + 0), -*(ao3 + 1));
	    data04 = CMULT(*(ao4 + 0), -*(ao4 + 1));
	    data05 = CMULT(*(ao5 + 0), ZERO);
	    data06 = CMULT(*(ao6 + 0), *(ao6 + 1));
	    data07 = CMULT(*(ao7 + 0), *(ao7 + 1));
	    data08 = CMULT(*(ao8 + 0), *(ao8 + 1));
	    break;
	  case -5 :
	    data01 = CMULT(*(ao1 + 0), -*(ao1 + 1));
	    data02 = CMULT(*(ao2 + 0), -*(ao2 + 1));
	    data03 = CMULT(*(ao3 + 0), -*(ao3 + 1));
	    data04 = CMULT(*(ao4 + 0), -*(ao4 + 1));
	    data05 = CMULT(*(ao5 + 0), -*(ao5 + 1));
	    data06 = CMULT(*(ao6 + 0), ZERO);
	    data07 = CMULT(*(ao7 + 0), *(ao7 + 1));
	    data08 = CMULT(*(ao8 + 0), *(ao8 + 1));
	    break;
	  case -6 :
	    data01 = CMULT(*(ao1 + 0), -*(ao1 + 1));
	    data02 = CMULT(*(ao2 + 0), -*(ao2 + 1));
	    data03 = CMULT(*(ao3 + 0), -*(ao3 + 1));
	    data04 = CMULT(*(ao4 + 0), -*(ao4 + 1));
	    data05 = CMULT(*(ao5 + 0), -*(ao5 + 1));
	    data06 = CMULT(*(ao6 + 0), -*(ao6 + 1));
	    data07 = CMULT(*(ao7 + 0), ZERO);
	    data08 = CMULT(*(ao8 + 0), *(ao8 + 1));
	    break;
	  case -7 :
	    data01 = CMULT(*(ao1 + 0), -*(ao1 + 1));
	    data02 = CMULT(*(ao2 + 0), -*(ao2 + 1));
	    data03 = CMULT(*(ao3 + 0), -*(ao3 + 1));
	    data04 = CMULT(*(ao4 + 0), -*(ao4 + 1));
	    data05 = CMULT(*(ao5 + 0), -*(ao5 + 1));
	    data06 = CMULT(*(ao6 + 0), -*(ao6 + 1));
	    data07 = CMULT(*(ao7 + 0), -*(ao7 + 1));
	    data08 = CMULT(*(ao8 + 0), ZERO);
	    break;
	  }
	}

      if (offset >   0) ao1 += lda; else ao1 += 2;
      if (offset >  -1) ao2 += lda; else ao2 += 2;
      if (offset >  -2) ao3 += lda; else ao3 += 2;
      if (offset >  -3) ao4 += lda; else ao4 += 2;
      if (offset >  -4) ao5 += lda; else ao5 += 2;
      if (offset >  -5) ao6 += lda; else ao6 += 2;
      if (offset >  -6) ao7 += lda; else ao7 += 2;
      if (offset >  -7) ao8 += lda; else ao8 += 2;

      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;

      offset --;
      i --;
    }

    posX += 8;
    js --;
  }

  if (n & 4) {
    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;
    if (offset > -2) ao3 = a + (posX + 2) * 2 + posY * lda; else ao3 = a + posY * 2 + (posX + 2) * lda;
    if (offset > -3) ao4 = a + (posX + 3) * 2 + posY * lda; else ao4 = a + posY * 2 + (posX + 3) * 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 += lda; else ao1 += 2;
      if (offset >  -1) ao2 += lda; else ao2 += 2;
      if (offset >  -2) ao3 += lda; else ao3 += 2;
      if (offset >  -3) ao4 += lda; else ao4 += 2;

      b[ 0] = data01;
      b[ 1] = data02;
      b[ 2] = data03;
      b[ 3] = data04;

      b += 4;

      offset --;
      i --;
    }

    posX += 4;
  }

  if (n & 2) {
    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) {
      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 += lda; else ao1 += 2;
      if (offset >  -1) ao2 += lda; else ao2 += 2;

      b[ 0] = data01;
      b[ 1] = data02;

      b += 2;

      offset --;
      i --;
    }

    posX += 2;
  }

  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) {
      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 += lda; else ao1 += 2;

      b[ 0] = data01;

      b ++;

      offset --;
      i --;
    }

  }

  return 0;
}
