Subversion Repositories or1k

/* 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

This file is part of 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 2 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, write to the Free Software

Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

/* 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;

}