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

/* 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    */

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/*                                                                   */

/* 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 <ctype.h></ctype.h>

#include "common.h"

const static FLOAT dm1 = -1.;

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

  BLASLONG i, is, min_i;

#if (TRANSA == 2) || (TRANSA == 4)

  FLOAT _Complex result;

#endif

#ifndef UNIT

  FLOAT ar, ai, br, bi, ratio, den;

#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 == 2) || (TRANSA == 4)

    if (m - is > 0){

#if TRANSA == 2

      GEMV_T(m - is, min_i, 0, dm1, ZERO,

	      a + (is + (is - min_i)  * lda) * COMPSIZE, lda,

	      B +  is          * COMPSIZE, 1,

	      B + (is - min_i) * COMPSIZE, 1, gemvbuffer);

#else

      GEMV_C(m - is, min_i, 0, dm1, ZERO,

	      a + (is + (is - min_i)  * lda) * COMPSIZE, lda,

	      B +  is            * COMPSIZE, 1,

	      B + (is - min_i)  * COMPSIZE, 1, gemvbuffer);

#endif

    }

#endif

    for (i = 0; i < min_i; i++) {

      FLOAT *AA = a + ((is - i - 1) + (is - i - 1) * lda) * COMPSIZE;

      FLOAT *BB = B + (is - i - 1) * COMPSIZE;

#if (TRANSA == 2) || (TRANSA == 4)

      if (i > 0) {

#if TRANSA == 2

	result = DOTU_K(i, AA + 2, 1, BB + 2, 1);

#else

	result = DOTC_K(i, AA + 2, 1, BB + 2, 1);

#endif

      BB[0] -= CREAL(result);

      BB[1] -= CIMAG(result);

      }

#endif

#ifndef UNIT

      ar = AA[0];

      ai = AA[1];

      if (fabs(ar) >= fabs(ai)){

	ratio = ai / ar;

	den = 1./(ar * ( 1 + ratio * ratio));

	ar =  den;

#if TRANSA < 3

	ai = -ratio * den;

#else

	ai =  ratio * den;

#endif

      } else {

	ratio = ar / ai;

	den = 1./(ai * ( 1 + ratio * ratio));

	ar =  ratio * den;

#if TRANSA < 3

	ai = -den;

#else

	ai =  den;

#endif

    }

      br = BB[0];

      bi = BB[1];

      BB[0] = ar*br - ai*bi;

      BB[1] = ar*bi + ai*br;

#endif

#if (TRANSA == 1) || (TRANSA == 3)

      if (i < min_i - 1) {

#if TRANSA == 1

	AXPYU_K (min_i - i - 1, 0, 0, - BB[0], -BB[1],

		 AA - (min_i - i - 1) * COMPSIZE, 1, BB - (min_i - i - 1) * COMPSIZE, 1, NULL, 0);

#else

	AXPYC_K(min_i - i - 1, 0, 0, - BB[0], -BB[1],

		 AA - (min_i - i - 1) * COMPSIZE, 1, BB - (min_i - i - 1) * COMPSIZE, 1, NULL, 0);

#endif

      }

#endif

    }

#if (TRANSA == 1) || (TRANSA == 3)

    if (is - min_i > 0){

#if   TRANSA == 1

      GEMV_N(is - min_i, min_i, 0, dm1, ZERO,

	      a +  (is - min_i) * lda * COMPSIZE, lda,

	      B +  (is - min_i)       * COMPSIZE, 1,

	      B,                                  1, gemvbuffer);

#else

      GEMV_R(is - min_i, min_i, 0, dm1, ZERO,

	      a +  (is - min_i) * lda * COMPSIZE, lda,

	      B +  (is - min_i)       * COMPSIZE, 1,

	      B,                                  1, gemvbuffer);

#endif

    }

#endif

  }

  if (incb != 1) {

    COPY_K(m, buffer, 1, b, incb);

  }

  return 0;

}