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/* misc.c -- Misc. routines that just don't fit anywhere else
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/* 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) 1999 Damjan Lampret, lampret@opencores.org
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Copyright (C) 2002 Marko Mlinar, markom@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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This file is part of OpenRISC 1000 Architectural Simulator.
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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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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* returns log2(x) */
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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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/* Call this log2_int, because there is a library function named log2 */
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int log2_int (unsigned long x)
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int
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log2_int (unsigned long x)
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{
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{
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int c = 0;
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int c = 0;
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if (!x) return 0; /* not by the book, but practical */
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if (!x)
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while (x != 1) x >>= 1, c++;
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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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return c;
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}
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}
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int is_power2 (int x)
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int
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is_power2 (int x)
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{
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{
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if(!x)
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if(!x)
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return 0;
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return 0;
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while (!(x & 1))
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while (!(x & 1))
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x >>= 1;
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x >>= 1;
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return x == 1;
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return x == 1;
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}
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}
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