/* misc.c -- Misc. routines that just don't fit anywhere else
|
/* misc.c -- Misc. routines that just don't fit anywhere else
|
|
|
Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
|
Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
|
Copyright (C) 2002 Marko Mlinar, markom@opencores.org
|
Copyright (C) 2002 Marko Mlinar, markom@opencores.org
|
Copyright (C) 2008 Embecosm Limited
|
Copyright (C) 2008 Embecosm Limited
|
|
|
Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
|
Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
|
|
|
This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
|
This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
|
|
|
This program is free software; you can redistribute it and/or modify it
|
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
|
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)
|
Software Foundation; either version 3 of the License, or (at your option)
|
any later version.
|
any later version.
|
|
|
This program is distributed in the hope that it will be useful, but WITHOUT
|
This program is distributed in the hope that it will be useful, but WITHOUT
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
more details.
|
more details.
|
|
|
You should have received a copy of the GNU General Public License along
|
You should have received a copy of the GNU General Public License along
|
with this program. If not, see <http://www.gnu.org/licenses/>. */
|
with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
/* This program is commented throughout in a fashion suitable for processing
|
/* This program is commented throughout in a fashion suitable for processing
|
with Doxygen. */
|
with Doxygen. */
|
|
|
|
|
/* Autoconf and/or portability configuration */
|
/* Autoconf and/or portability configuration */
|
#include "config.h"
|
#include "config.h"
|
|
|
|
|
/* returns log2(x) */
|
/* returns log2(x) */
|
/* Call this log2_int, because there is a library function named log2 */
|
/* Call this log2_int, because there is a library function named log2 */
|
int
|
int
|
log2_int (unsigned long x)
|
log2_int (unsigned long x)
|
{
|
{
|
int c = 0;
|
int c = 0;
|
if (!x)
|
if (!x)
|
return 0; /* not by the book, but practical */
|
return 0; /* not by the book, but practical */
|
while (x != 1)
|
while (x != 1)
|
x >>= 1, c++;
|
x >>= 1, c++;
|
return c;
|
return c;
|
}
|
}
|
|
|
int
|
int
|
is_power2 (int x)
|
is_power2 (int x)
|
{
|
{
|
if (!x)
|
if (!x)
|
return 0;
|
return 0;
|
while (!(x & 1))
|
while (!(x & 1))
|
x >>= 1;
|
x >>= 1;
|
return x == 1;
|
return x == 1;
|
}
|
}
|
|
|
