View of xos/include/misc.h

/* Copyright (C) 2008  Emmanuel Varoquaux
 
   This file is part of XOS.
 
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 
#ifndef _MISC_H
#define _MISC_H
 
static inline unsigned long exp2(unsigned int k)
{
  return 1UL << k;
}
 
static inline unsigned int ulog2(unsigned long n)
{
  unsigned int k;
 
  k = 0;
  while (exp2(k) < n)
    k++;
  return k;
}
 
#endif