/*********************************************************************/
/* 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.                                                  */
/*                                                                   */
/*   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   */
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/*********************************************************************/

#include <stdio.h>
#include "common.h"

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

  BLASLONG i, j;
  FLOAT *a_offset, *a_offset1, *a_offset2;
  FLOAT *b_offset, *b_offset1, *b_offset2;
  FLOAT  ctemp1,  ctemp2,  ctemp3,  ctemp4;
  FLOAT  ctemp5,  ctemp6,  ctemp7,  ctemp8;
  FLOAT  ctemp9, ctemp10, ctemp11, ctemp12;
  FLOAT ctemp13, ctemp14, ctemp15, ctemp16;

  a_offset = a;
  b_offset = b;

  b_offset2 = b + m * (n & ~1) * 2;

  lda *= 2;

  j = (m >> 1);
  if (j > 0){
    do{
      a_offset1 = a_offset;
      a_offset2 = a_offset1 + lda;
      a_offset += 2 * lda;

      b_offset1 = b_offset;
      b_offset += 8;

      i = (n >> 2);
      if (i > 0){
	do{
	  ctemp1  = *(a_offset1 +  0);
	  ctemp2  = *(a_offset1 +  1);
	  ctemp3  = *(a_offset1 +  2);
	  ctemp4  = *(a_offset1 +  3);

	  ctemp5  = *(a_offset1 +  4);
	  ctemp6  = *(a_offset1 +  5);
	  ctemp7  = *(a_offset1 +  6);
	  ctemp8  = *(a_offset1 +  7);

	  ctemp9  = *(a_offset2 +  0);
	  ctemp10 = *(a_offset2 +  1);
	  ctemp11 = *(a_offset2 +  2);
	  ctemp12 = *(a_offset2 +  3);

	  ctemp13 = *(a_offset2 +  4);
	  ctemp14 = *(a_offset2 +  5);
	  ctemp15 = *(a_offset2 +  6);
	  ctemp16 = *(a_offset2 +  7);

	  *(b_offset1 + 0) = -ctemp1;
	  *(b_offset1 + 1) = -ctemp2;
	  *(b_offset1 + 2) = -ctemp3;
	  *(b_offset1 + 3) = -ctemp4;

	  *(b_offset1 + 4) = -ctemp9;
	  *(b_offset1 + 5) = -ctemp10;
	  *(b_offset1 + 6) = -ctemp11;
	  *(b_offset1 + 7) = -ctemp12;

	  b_offset1 += m * 4;

	  *(b_offset1 + 0) = -ctemp5;
	  *(b_offset1 + 1) = -ctemp6;
	  *(b_offset1 + 2) = -ctemp7;
	  *(b_offset1 + 3) = -ctemp8;

	  *(b_offset1 + 4) = -ctemp13;
	  *(b_offset1 + 5) = -ctemp14;
	  *(b_offset1 + 6) = -ctemp15;
	  *(b_offset1 + 7) = -ctemp16;

	  b_offset1 += m * 4;

	  a_offset1 += 8;
	  a_offset2 += 8;
	  i --;
	} while(i>0);
      }

      if (n & 2){
	ctemp1  = *(a_offset1 +  0);
	ctemp2  = *(a_offset1 +  1);
	ctemp3  = *(a_offset1 +  2);
	ctemp4  = *(a_offset1 +  3);

	ctemp9  = *(a_offset2 +  0);
	ctemp10 = *(a_offset2 +  1);
	ctemp11 = *(a_offset2 +  2);
	ctemp12 = *(a_offset2 +  3);

	*(b_offset1 + 0) = -ctemp1;
	*(b_offset1 + 1) = -ctemp2;
	*(b_offset1 + 2) = -ctemp3;
	*(b_offset1 + 3) = -ctemp4;

	*(b_offset1 + 4) = -ctemp9;
	*(b_offset1 + 5) = -ctemp10;
	*(b_offset1 + 6) = -ctemp11;
	*(b_offset1 + 7) = -ctemp12;

	// b_offset1 += m * 4;
	a_offset1 += 4;
	a_offset2 += 4;
      }

      if (n & 1){
	ctemp1  = *(a_offset1 +  0);
	ctemp2  = *(a_offset1 +  1);
	ctemp9  = *(a_offset2 +  0);
	ctemp10 = *(a_offset2 +  1);

	*(b_offset2 + 0) = -ctemp1;
	*(b_offset2 + 1) = -ctemp2;
	*(b_offset2 + 2) = -ctemp9;
	*(b_offset2 + 3) = -ctemp10;
	b_offset2 += 4;
      }
      j--;
    } while(j > 0);
  }

  if (m & 1){
    i = (n >> 2);
    if (i > 0){
      do{
	ctemp1  = *(a_offset +  0);
	ctemp2  = *(a_offset +  1);
	ctemp3  = *(a_offset +  2);
	ctemp4  = *(a_offset +  3);

	ctemp5  = *(a_offset +  4);
	ctemp6  = *(a_offset +  5);
	ctemp7  = *(a_offset +  6);
	ctemp8  = *(a_offset +  7);

	*(b_offset + 0) = -ctemp1;
	*(b_offset + 1) = -ctemp2;
	*(b_offset + 2) = -ctemp3;
	*(b_offset + 3) = -ctemp4;

	b_offset += m * 4;

	*(b_offset + 0) = -ctemp5;
	*(b_offset + 1) = -ctemp6;
	*(b_offset + 2) = -ctemp7;
	*(b_offset + 3) = -ctemp8;

	b_offset += m * 4;
	a_offset += 8;
	i --;
      } while(i > 0);
    }

    if (n & 2){
      ctemp1  = *(a_offset +  0);
      ctemp2  = *(a_offset +  1);
      ctemp3  = *(a_offset +  2);
      ctemp4  = *(a_offset +  3);

      *(b_offset + 0) = -ctemp1;
      *(b_offset + 1) = -ctemp2;
      *(b_offset + 2) = -ctemp3;
      *(b_offset + 3) = -ctemp4;

      // b_offset += m * 4;
      a_offset += 4;
    }

    if (n & 1){
      ctemp1  = *(a_offset +  0);
      ctemp2  = *(a_offset +  1);
      *(b_offset2 + 0) = -ctemp1;
      *(b_offset2 + 1) = -ctemp2;
    }
  }

  return 0;
}
