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

/* 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    */

/*    (INCLUDING, BUT  NOT LIMITED TO,  PROCUREMENT OF SUBSTITUTE    */

/*    GOODS  OR  SERVICES; LOSS  OF  USE,  DATA,  OR PROFITS;  OR    */

/*    BUSINESS INTERRUPTION) HOWEVER CAUSED  AND ON ANY THEORY OF    */

/*    LIABILITY, WHETHER  IN CONTRACT, STRICT  LIABILITY, OR TORT    */

/*    (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING IN ANY WAY OUT    */

/*    OF  THE  USE OF  THIS  SOFTWARE,  EVEN  IF ADVISED  OF  THE    */

/*    POSSIBILITY OF SUCH DAMAGE.                                    */

/*                                                                   */

/* 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"

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

  BLASLONG 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);

  }

  a += (m + 1) * m - 2;

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

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

    if (i > 0) {

#if TRANSA == 2

      result = DOTU_K(i, a + 2, 1, B + (m - i) * 2, 1);

#else

      result = DOTC_K(i, a + 2, 1, B + (m - i) * 2, 1);

#endif

      B[(m - i - 1) * 2 + 0] -= CREAL(result);

      B[(m - i - 1) * 2 + 1] -= CIMAG(result);

    }

#endif

#ifndef UNIT

    ar = a[0];

    ai = a[1];

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

      ratio = ai / ar;

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

      ar =  den;

#if (TRANSA == 1) || (TRANSA == 2)

      ai = -ratio * den;

#else

      ai =  ratio * den;

#endif

    } else {

      ratio = ar / ai;

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

      ar =  ratio * den;

#if (TRANSA == 1) || (TRANSA == 2)

      ai = -den;

#else

      ai =  den;

#endif

    }

    br = B[(m - i - 1) * 2 + 0];

    bi = B[(m - i - 1) * 2 + 1];

    B[(m - i - 1) * 2 + 0] = ar*br - ai*bi;

    B[(m - i - 1) * 2 + 1] = ar*bi + ai*br;

#endif

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

    if (i < m - 1) {

#if TRANSA == 1

      AXPYU_K (m - i - 1, 0, 0, - B[(m - i - 1) * 2 + 0], -B[(m - i - 1) * 2 + 1],

	       a - (m - i - 1) * COMPSIZE, 1, B, 1, NULL, 0);

#else

      AXPYC_K (m - i - 1, 0, 0, - B[(m - i - 1) * 2 + 0], -B[(m - i - 1) * 2 + 1],

	       a - (m - i - 1) * COMPSIZE, 1, B, 1, NULL, 0);

#endif

    }

#endif

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

    a -= (m - i) * 2;

#else

    a -= (i + 2) * 2;

#endif

  }

  if (incb != 1) {

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

  }

  return 0;

}