Subversion Repositories openrisc_2011-10-31

/* misc.c -- Misc. routines that just don't fit anywhere else
 
   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
   Copyright (C) 2002 Marko Mlinar, markom@opencores.org
   Copyright (C) 2008 Embecosm Limited
 
   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
 
   This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
 
   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/>.  */
 
/* This program is commented throughout in a fashion suitable for processing
   with Doxygen. */
 
 
/* Autoconf and/or portability configuration */
#include "config.h"
 
 
/* returns log2(x) */
/* Call this log2_int, because there is a library function named log2 */
int
log2_int (unsigned long x)
{
  int c = 0;
  if (!x)
    return 0;			/* not by the book, but practical */
  while (x != 1)
    x >>= 1, c++;
  return c;
}
 
int
is_power2 (int x)
{
  if (!x)
    return 0;
  while (!(x & 1))
    x >>= 1;
  return x == 1;
}