/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
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/* without modification, are permitted provided that the following   */
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/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
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/*********************************************************************/

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

int CNAME(int mode, blas_arg_t *arg, BLASLONG *range_m, BLASLONG *range_n, int (*function)(), void *sa, void *sb, BLASLONG nthreads) {

  blas_queue_t queue[MAX_CPU_NUMBER];
  BLASLONG range[MAX_CPU_NUMBER + 1];

  BLASLONG width, i;
  BLASLONG n_from, n_to;
  double dnum, nf, nt, di;

  int num_cpu;
  int mask = 0;
  
  if (!(mode & BLAS_COMPLEX)) {

    switch (mode & BLAS_PREC) {
    case BLAS_SINGLE:
      mask = MAX(SGEMM_UNROLL_M, SGEMM_UNROLL_N) - 1;
      break;
    case BLAS_DOUBLE:
      mask = MAX(DGEMM_UNROLL_M, DGEMM_UNROLL_N) - 1;
      break;
#ifdef EXPRECISION
    case BLAS_XDOUBLE:
      mask = MAX(QGEMM_UNROLL_M, QGEMM_UNROLL_N) - 1;
      break;
#endif
    }
  } else {
    switch (mode & BLAS_PREC) {
    case BLAS_SINGLE:
      mask = MAX(CGEMM_UNROLL_M, CGEMM_UNROLL_N) - 1;
      break;
    case BLAS_DOUBLE:
      mask = MAX(ZGEMM_UNROLL_M, ZGEMM_UNROLL_N) - 1;
      break;
#ifdef EXPRECISION
    case BLAS_XDOUBLE:
      mask = MAX(XGEMM_UNROLL_M, XGEMM_UNROLL_N) - 1;
      break;
#endif
    }
  }
  
  n_from = 0;
  n_to   = arg -> n;

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

  if (!(mode & BLAS_UPLO)) {

    nf = (double)(n_from);
    nt = (double)(n_to);
    
    dnum = (nt * nt - nf * nf) / (double)nthreads;
    
    num_cpu  = 0;
    
    range[0] = n_from;
    i        = n_from;
    
    while (i < n_to){
      
      if (nthreads - num_cpu > 1) {
	
	di = (double)i;
	width = ((BLASLONG)( sqrt(di * di + dnum) - di) + mask) & ~mask;
	
	if ((width <= 0) || (width > n_to - i)) width = n_to - i;
	
      } else {
	width = n_to - i;
      }
      
      range[num_cpu + 1] = range[num_cpu] + width;
      
      queue[num_cpu].mode    = mode;
      queue[num_cpu].routine = function;
      queue[num_cpu].args    = arg;
      queue[num_cpu].range_m = range_m;
      queue[num_cpu].range_n = &range[num_cpu];
      queue[num_cpu].sa      = NULL;
      queue[num_cpu].sb      = NULL;
      queue[num_cpu].next    = &queue[num_cpu + 1];
      
      num_cpu ++;
      i += width;
    }
  
  } else {

    nf = (double)(arg -> n - n_from);
    nt = (double)(arg -> n - n_to);

    dnum = (nt * nt - nf * nf) / (double)nthreads;
    
    num_cpu  = 0;
    
    range[0] = n_from;
    i        = n_from;
    
    while (i < n_to){
      
      if (nthreads - num_cpu > 1) {
	
	di = (double)(arg -> n - i);
	width = ((BLASLONG)(-sqrt(di * di + dnum) + di) + mask) & ~mask;
	
	if ((width <= 0) || (width > n_to - i)) width = n_to - i;
	
      } else {
	width = n_to - i;
      }
      
      range[num_cpu + 1] = range[num_cpu] + width;
      
      queue[num_cpu].mode    = mode;
      queue[num_cpu].routine = function;
      queue[num_cpu].args    = arg;
      queue[num_cpu].range_m = range_m;
      queue[num_cpu].range_n = &range[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 = sa;
    queue[0].sb = sb;
    queue[num_cpu - 1].next = NULL;
   
    exec_blas(num_cpu, queue);
  }
  
  return 0;
}
