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Add HighPrecision class used for external Time bookkeeping

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This commit is contained in:
Mathieu Lacage
2006-11-03 09:05:58 +01:00
parent 72d9b91ce5
commit e24d630008
3 changed files with 251 additions and 0 deletions
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2
SConstruct
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@@ -48,6 +48,7 @@ simu = build.Ns3Module('simulator', 'src/simulator')
ns3.add(simu)
simu.add_dep('core')
simu.add_sources([
'high-precision.cc',
'time.cc',
'event-id.cc',
'scheduler.cc',
@@ -64,6 +65,7 @@ simu.add_headers([
'scheduler-list.h'
])
simu.add_inst_headers([
'high-precision.h',
'nstime.h',
'event-id.h',
'event-impl.h',

158
src/simulator/high-precision.cc Normal file
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@@ -0,0 +1,158 @@
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2006 INRIA
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
*/
#include "high-precision.h"
#ifdef HIGH_PRECISION_I128
HighPrecision::HighPrecision ()
: m_high (0),
m_low (0)
{}
HighPrecision::HighPrecision (int64_t high, int64_t low)
: m_high (high),
m_low (low)
{}
HighPrecision::HighPrecision (double value)
: m_high (0), // XXX
m_low (0) // XXX
{}
int64_t
HighPrecision::GetHigh (void) const
{
return m_high;
}
uint32_t
HighPrecision::GetLow (void) const
{
return m_low;
}
double
HighPrecision::GetDouble (void) const
{
return 0.0;
}
bool
HighPrecision::Add (HighPrecision const &o)
{
return false;
}
bool
HighPrecision::Sub (HighPrecision const &o)
{
return false;
}
bool
HighPrecision::Mul (HighPrecision const &o)
{
return false;
}
bool
HighPrecision::Div (HighPrecision const &o)
{
return false;
}
int
HighPrecision::Compare (HighPrecision const &o) const
{
return 0;
}
HighPrecision
HighPrecision::Zero (void)
{
return HighPrecision (0,0);
}
#else /* HIGH_PRECISION_I128 */
#include <cmath>
#include <cassert>
const double HighPrecision::MAX_64 = 18446744073709551615.0;
HighPrecision::HighPrecision ()
: m_value (0.0)
{}
HighPrecision::HighPrecision (int64_t high, int64_t low)
: m_value (((double)high) + (((double)low)/MAX_64))
{}
HighPrecision::HighPrecision (double value)
: m_value (value)
{}
int64_t
HighPrecision::GetHigh (void) const
{
return (int64_t)floor (m_value);
}
int64_t
HighPrecision::GetLow (void) const
{
return (int64_t)((m_value - floor (m_value)) * MAX_64);
}
double
HighPrecision::GetDouble (void) const
{
return m_value;
}
bool
HighPrecision::Add (HighPrecision const &o)
{
m_value += o.m_value;
return false;
}
bool
HighPrecision::Sub (HighPrecision const &o)
{
m_value -= o.m_value;
return false;
}
bool
HighPrecision::Mul (HighPrecision const &o)
{
m_value *= o.m_value;
return false;
}
bool
HighPrecision::Div (HighPrecision const &o)
{
m_value /= o.m_value;
return false;
}
int
HighPrecision::Compare (HighPrecision const &o) const
{
return 0;
}
HighPrecision
HighPrecision::Zero (void)
{
return HighPrecision (0,0);
}
#endif /* HIGH_PRECISION_I128 */

91
src/simulator/high-precision.h Normal file
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@@ -0,0 +1,91 @@
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2006 INRIA
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
*/
#ifndef HIGH_PRECISION_H
#define HIGH_PRECISION_H
#include <stdint.h>
#ifdef HIGH_PRECISION_I128
/**
* This should be a high-precision 128bit integer version of
* HighPrecision class. It should also be able to report
* overflow and underflow.
*/
class HighPrecision
{
public:
HighPrecision ();
HighPrecision (int64_t high, int64_t low);
HighPrecision (double value);
int64_t GetHigh (void) const;
int64_t GetLow (void) const;
double GetDouble (void) const;
bool Add (HighPrecision const &o);
bool Sub (HighPrecision const &o);
bool Mul (HighPrecision const &o);
bool Div (HighPrecision const &o);
int Compare (HighPrecision const &o) const;
static HighPrecision Zero (void);
private:
int64_t m_high;
int64_t m_low;
};
#else /* HIGH_PRECISION_I128 */
/**
* Obviously, this implementation of the HighPrecision class does
* not provide the 128 bits accuracy since it uses a an IEEE754 double
* to store the value. It also does not report overflows.
* So, it is a nice shortcut but in no way a complete solution.
*/
class HighPrecision
{
public:
HighPrecision ();
HighPrecision (int64_t high, int64_t low);
HighPrecision (double value);
int64_t GetHigh (void) const;
int64_t GetLow (void) const;
double GetDouble (void) const;
bool Add (HighPrecision const &o);
bool Sub (HighPrecision const &o);
bool Mul (HighPrecision const &o);
bool Div (HighPrecision const &o);
int Compare (HighPrecision const &o) const;
static HighPrecision Zero (void);
private:
static const double MAX_64;
double m_value;
};
#endif /* HIGH_PRECISION_I128 */
#endif /* HIGH_PRECISION_H */