1a6f21b8d2
cpu/SConscript:
Remove sat_counter.cc and push its functions into the .hh file (all functions were 3 or less lines).
cpu/o3/sat_counter.hh:
Incorporate .cc code into this file.
--HG--
extra : convert_revision : d75b1319292b00b00af1ce377cc0215fd06e6916
113 lines
3.4 KiB
C++
113 lines
3.4 KiB
C++
/*
|
|
* Copyright (c) 2005-2006 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.
|
|
*/
|
|
|
|
#ifndef __CPU_O3_SAT_COUNTER_HH__
|
|
#define __CPU_O3_SAT_COUNTER_HH__
|
|
|
|
#include "sim/host.hh"
|
|
|
|
/**
|
|
* Private counter class for the internal saturating counters.
|
|
* Implements an n bit saturating counter and provides methods to
|
|
* increment, decrement, and read it.
|
|
* @todo Consider making this something that more closely mimics a
|
|
* built in class so you can use ++ or --.
|
|
*/
|
|
class SatCounter
|
|
{
|
|
public:
|
|
/**
|
|
* Constructor for the counter.
|
|
*/
|
|
SatCounter()
|
|
: initialVal(0), counter(0)
|
|
{ }
|
|
|
|
/**
|
|
* Constructor for the counter.
|
|
* @param bits How many bits the counter will have.
|
|
*/
|
|
SatCounter(unsigned bits)
|
|
: initialVal(0), maxVal((1 << bits) - 1), counter(0)
|
|
{ }
|
|
|
|
/**
|
|
* Constructor for the counter.
|
|
* @param bits How many bits the counter will have.
|
|
* @param initial_val Starting value for each counter.
|
|
*/
|
|
SatCounter(unsigned bits, uint8_t initial_val)
|
|
: initialVal(initialVal), maxVal((1 << bits) - 1), counter(initial_val)
|
|
{
|
|
// Check to make sure initial value doesn't exceed the max
|
|
// counter value.
|
|
if (initial_val > maxVal) {
|
|
fatal("BP: Initial counter value exceeds max size.");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sets the number of bits.
|
|
*/
|
|
void setBits(unsigned bits) { maxVal = (1 << bits) - 1; }
|
|
|
|
void reset() { counter = initialVal; }
|
|
|
|
/**
|
|
* Increments the counter's current value.
|
|
*/
|
|
void increment()
|
|
{
|
|
if (counter < maxVal) {
|
|
++counter;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Decrements the counter's current value.
|
|
*/
|
|
void decrement()
|
|
{
|
|
if (counter > 0) {
|
|
--counter;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Read the counter's value.
|
|
*/
|
|
const uint8_t read() const
|
|
{ return counter; }
|
|
|
|
private:
|
|
uint8_t initialVal;
|
|
uint8_t maxVal;
|
|
uint8_t counter;
|
|
};
|
|
|
|
#endif // __CPU_O3_SAT_COUNTER_HH__
|