/*********************************************************************/
/* 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,    */
/*    INCLUDING, BUT  NOT LIMITED  TO, THE IMPLIED  WARRANTIES OF    */
/*    MERCHANTABILITY  AND FITNESS FOR  A PARTICULAR  PURPOSE ARE    */
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/* interpreted as representing official policies, either expressed   */
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/*********************************************************************/

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

static FLOAT dp1 = 1.;

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

  BLASLONG i, is, min_i;
#if (TRANSA == 2) || (TRANSA == 4)
  FLOAT _Complex temp;
#endif
#ifndef UNIT
  FLOAT atemp1, atemp2, btemp1, btemp2;
#endif
  FLOAT *gemvbuffer = (FLOAT *)buffer;
  FLOAT *B = b;

  if (incb != 1) {
    B = buffer;
    gemvbuffer = (FLOAT *)(((BLASLONG)buffer + m * sizeof(FLOAT) * 2 + 4095) & ~4095);
    COPY_K(m, b, incb, buffer, 1);
  }

  for (is = m; is > 0; is -= DTB_ENTRIES){

    min_i = MIN(is, DTB_ENTRIES);

#if (TRANSA == 1) || (TRANSA == 3)
    if (m - is > 0){
#if   TRANSA == 1
      GEMV_N(m - is, min_i, 0, dp1, ZERO,
	      a + (is + (is - min_i) * lda) * 2, lda,
	      B + (is - min_i) * 2, 1,
	      B + is * 2, 1, gemvbuffer);
#else
      GEMV_R(m - is, min_i, 0, dp1, ZERO,
	      a + (is + (is - min_i) * lda) * 2, lda,
	      B + (is - min_i) * 2, 1,
	      B + is * 2, 1, gemvbuffer);
#endif
    }
#endif

    for (i = 0; i < min_i; i++) {
      FLOAT *AA = a + ((is - i - 1) + (is - i - 1) * lda) * 2;
      FLOAT *BB = B + (is - i - 1) * 2;

#if (TRANSA == 1) || (TRANSA == 3)
#if TRANSA == 1
      if (i > 0) AXPYU_K (i, 0, 0, BB[0], BB[1], AA + 2, 1, BB + 2, 1, NULL, 0);
#else
      if (i > 0) AXPYC_K(i, 0, 0, BB[0], BB[1], AA + 2, 1, BB + 2, 1, NULL, 0);
#endif
#endif

#ifndef UNIT
      atemp1 = AA[0];
      atemp2 = AA[1];

      btemp1 = BB[0];
      btemp2 = BB[1];

#if (TRANSA == 1) || (TRANSA == 2)
      BB[0] = atemp1 * btemp1 - atemp2 * btemp2;
      BB[1] = atemp1 * btemp2 + atemp2 * btemp1;
#else
      BB[0] = atemp1 * btemp1 + atemp2 * btemp2;
      BB[1] = atemp1 * btemp2 - atemp2 * btemp1;
#endif
#endif

#if (TRANSA == 2) || (TRANSA == 4)
      if (i < min_i - 1) {
#if   TRANSA == 2
	temp = DOTU_K(min_i - i - 1, AA - (min_i - i - 1) * 2, 1, BB - (min_i - i - 1) * 2, 1);
#else
	temp = DOTC_K(min_i - i - 1, AA - (min_i - i - 1) * 2, 1, BB - (min_i - i - 1) * 2, 1);
#endif

      BB[0] += CREAL(temp);
      BB[1] += CIMAG(temp);
      }
#endif

    }
    
#if (TRANSA == 2) || (TRANSA == 4)
    if (is - min_i > 0){
#if TRANSA == 2
      GEMV_T(is - min_i, min_i, 0, dp1, ZERO,
	      a + (is - min_i) * lda * 2, lda,
	      B,              1,
	      B + (is - min_i) * 2, 1, gemvbuffer);
#else
      GEMV_C(is - min_i, min_i, 0, dp1, ZERO,
	      a + (is - min_i) * lda * 2, lda,
	      B,              1,
	      B + (is - min_i) * 2, 1, gemvbuffer);
#endif
    }
#endif
  }

  if (incb != 1) {
    COPY_K(m, buffer, 1, b, incb);
  }

  return 0;
}