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[/] [openrisc/] [trunk/] [or1ksim/] [support/] [misc.c] - Blame information for rev 762

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Line No. Rev Author Line
1 19 jeremybenn
/* misc.c -- Misc. routines that just don't fit anywhere else
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   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
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   Copyright (C) 2002 Marko Mlinar, markom@opencores.org
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   Copyright (C) 2008 Embecosm Limited
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   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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   This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
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   This program is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by the Free
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   Software Foundation; either version 3 of the License, or (at your option)
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   any later version.
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   This program is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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   more details.
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   You should have received a copy of the GNU General Public License along
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   with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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/* This program is commented throughout in a fashion suitable for processing
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   with Doxygen. */
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/* Autoconf and/or portability configuration */
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#include "config.h"
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/* returns log2(x) */
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/* Call this log2_int, because there is a library function named log2 */
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int
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log2_int (unsigned long x)
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{
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  int c = 0;
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  if (!x)
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    return 0;                    /* not by the book, but practical */
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  while (x != 1)
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    x >>= 1, c++;
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  return c;
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}
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int
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is_power2 (int x)
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{
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  if (!x)
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    return 0;
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  while (!(x & 1))
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    x >>= 1;
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  return x == 1;
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}

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