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/*
* Copyright (c) 2003-2005 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <cstdlib>
#include <cmath>
#include "sim/param.hh"
#include "base/random.hh"
#include "base/trace.hh"
using namespace std;
class RandomContext : public ParamContext
{
public:
RandomContext(const string &_iniSection)
: ::ParamContext(_iniSection) {}
~RandomContext() {}
void checkParams();
};
RandomContext paramContext("random");
Param<unsigned>
seed(¶mContext, "seed", "seed to random number generator", 1);
void
RandomContext::checkParams()
{
::srand48(seed);
}
long
getLong()
{
return mrand48();
}
int64_t
getUniform(int64_t maxmin)
{
double r;
r = (drand48() - 0.500) * 2 * maxmin;
return (int64_t)round(r);
}
uint64_t
getUniformPos(uint64_t max)
{
double r;
r = drand48() * 2 * max;
return (uint64_t)round(r);
}
// idea for generating a double from erand48
double
getDouble()
{
union {
uint32_t _long[2];
uint16_t _short[4];
};
_long[0] = mrand48();
_long[1] = mrand48();
return ldexp((double) _short[0], -48) +
ldexp((double) _short[1], -32) +
ldexp((double) _short[2], -16);
}
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