/*********************************************************************/
/* 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>
#include <stdlib.h>
#include "common.h"

#if   !defined(CONJ) && !defined(XCONJ)
#define MYAXPY	AXPYU_K
#define MYDOT	DOTU_K
#elif  defined(CONJ) && !defined(XCONJ)
#define MYAXPY	AXPYC_K
#define MYDOT	DOTC_K
#elif !defined(CONJ) &&  defined(XCONJ)
#define MYAXPY	AXPYU_K
#define MYDOT	DOTC_K
#else
#define MYAXPY	AXPYC_K
#define MYDOT	DOTU_K
#endif

static int gbmv_kernel(blas_arg_t *args, BLASLONG *range_m, BLASLONG *range_n, FLOAT *dummy1, FLOAT *buffer, BLASLONG pos){

  FLOAT *a, *x, *y;
  BLASLONG lda, incx;
  BLASLONG n_from, n_to;
  BLASLONG i, offset_l, offset_u, uu, ll, ku, kl;
#ifdef TRANSA
#ifndef COMPLEX
  FLOAT result;
#else
  FLOAT _Complex result;
#endif
#endif

  a = (FLOAT *)args -> a;
  x = (FLOAT *)args -> b;
  y = (FLOAT *)args -> c;

  lda  = args -> lda;
  incx = args -> ldb;
  ku   = args -> ldc;
  kl   = args -> ldd;

  n_from = 0;
  n_to   = args -> n;

  if (range_m) y += *range_m * COMPSIZE;

  if (range_n) {
    n_from = *(range_n + 0);
    n_to   = *(range_n + 1);

    a += n_from * lda  * COMPSIZE;
  }

  n_to = MIN(n_to, args -> m + ku);

#ifdef TRANSA
  if (incx != 1) {
    COPY_K(args -> m, x, incx, buffer, 1);

    x = buffer;
    buffer += ((COMPSIZE * args -> m  + 1023) & ~1023);
  }
#endif

  SCAL_K(
#ifndef TRANSA
	 args -> m,
#else
	 args -> n,
#endif	 
	 0, 0, ZERO, 
#ifdef COMPLEX
	 ZERO,
#endif
	 y, 1, NULL, 0, NULL, 0);  
  
  offset_u = ku - n_from;
  offset_l = ku - n_from + args -> m;

#ifndef TRANSA
  x += n_from * incx * COMPSIZE;
  y -= offset_u      * COMPSIZE;
#else
  x -= offset_u      * COMPSIZE;
  y += n_from        * COMPSIZE;
#endif

  for (i = n_from; i < n_to; i++) {

    uu = MAX(offset_u, 0);
    ll = MIN(offset_l, ku + kl + 1);

#ifndef TRANSA
    MYAXPY(ll - uu, 0, 0,
	    *(x + 0),
#ifdef COMPLEX
#ifndef XCONJ
	     *(x + 1),
#else
	    -*(x + 1),
#endif
#endif
	    a + uu * COMPSIZE, 1, y + uu * COMPSIZE, 1, NULL, 0);

    x += incx * COMPSIZE;
#else
    result = MYDOT(ll - uu, a + uu * COMPSIZE, 1, x + uu * COMPSIZE, 1);

#ifndef COMPLEX
    *y = result;
#else
    *(y + 0) += CREAL(result);
#ifndef XCONJ
    *(y + 1) += CIMAG(result);
#else
    *(y + 1) -= CIMAG(result);
#endif
#endif

    x += COMPSIZE;
#endif
    
    y += COMPSIZE;

    offset_u --;
    offset_l --;

    a += lda * COMPSIZE;
  }

  return 0;
}

#ifndef COMPLEX
int CNAME(BLASLONG m, BLASLONG n, BLASLONG ku, BLASLONG kl, FLOAT  alpha, FLOAT *a, BLASLONG lda, FLOAT *x, BLASLONG incx, FLOAT *y, BLASLONG incy, FLOAT *buffer, int nthreads){
#else
int CNAME(BLASLONG m, BLASLONG n, BLASLONG ku, BLASLONG kl, FLOAT *alpha, FLOAT *a, BLASLONG lda, FLOAT *x, BLASLONG incx, FLOAT *y, BLASLONG incy, FLOAT *buffer, int nthreads){
#endif

  blas_arg_t args;
  blas_queue_t queue[MAX_CPU_NUMBER];
  BLASLONG range_m[MAX_CPU_NUMBER];
  BLASLONG range_n[MAX_CPU_NUMBER + 1];

  BLASLONG width, i, num_cpu;

#ifdef SMP
#ifndef COMPLEX
#ifdef XDOUBLE
  int mode  =  BLAS_XDOUBLE | BLAS_REAL;
#elif defined(DOUBLE)
  int mode  =  BLAS_DOUBLE  | BLAS_REAL;
#else
  int mode  =  BLAS_SINGLE  | BLAS_REAL;
#endif  
#else
#ifdef XDOUBLE
  int mode  =  BLAS_XDOUBLE | BLAS_COMPLEX;
#elif defined(DOUBLE)
  int mode  =  BLAS_DOUBLE  | BLAS_COMPLEX;
#else
  int mode  =  BLAS_SINGLE  | BLAS_COMPLEX;
#endif  
#endif
#endif

  args.m = m;
  args.n = n;
  
  args.a = (void *)a;
  args.b = (void *)x;
  args.c = (void *)buffer;
    
  args.lda = lda;
  args.ldb = incx;
  args.ldc = ku;
  args.ldd = kl;

  num_cpu  = 0;
  
  range_n[0] = 0;
  i          = n;
    
  while (i > 0){

    width  = blas_quickdivide(i + nthreads - num_cpu - 1, nthreads - num_cpu);

    if (width < 4) width = 4;
    if (i < width) width = i;

    range_n[num_cpu + 1] = range_n[num_cpu] + width;
      
#ifndef TRANSA
    range_m[num_cpu] = num_cpu * ((m + 15) & ~15);
#else
    range_m[num_cpu] = num_cpu * ((n + 15) & ~15);
#endif

    queue[num_cpu].mode    = mode;
    queue[num_cpu].routine = gbmv_kernel;
    queue[num_cpu].args    = &args;
    queue[num_cpu].range_m = &range_m[num_cpu];
    queue[num_cpu].range_n = &range_n[num_cpu];
    queue[num_cpu].sa      = NULL;
    queue[num_cpu].sb      = NULL;
    queue[num_cpu].next    = &queue[num_cpu + 1];
    
    num_cpu ++;
    i -= width;
  }

  if (num_cpu) {
    queue[0].sa = NULL;
#ifndef TRANSA
    queue[0].sb = buffer + num_cpu * (((m + 255) & ~255) + 16) * COMPSIZE;
#else
    queue[0].sb = buffer + num_cpu * (((n + 255) & ~255) + 16) * COMPSIZE;
#endif
    
    queue[num_cpu - 1].next = NULL;
    
    exec_blas(num_cpu, queue);
  }
  
  for (i = 1; i < num_cpu; i ++) {
    AXPYU_K(
#ifndef TRANSA
	    m,
#else
	    n,
#endif
	    0, 0,
#ifndef COMPLEX
	    ONE,
#else
	    ONE, ZERO,
#endif
	    buffer + range_m[i] * COMPSIZE, 1, buffer, 1, NULL, 0);
  }

  AXPYU_K(
#ifndef TRANSA
	    m,
#else
	    n,
#endif
	    0, 0,
#ifndef COMPLEX
	    alpha,
#else
	    alpha[0], alpha[1],
#endif
	    buffer, 1, y, incy, NULL, 0);

  return 0;
}