71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
/*
|
|
* Copyright (c) 2004-2005 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 "base/misc.hh"
|
|
#include "cpu/beta_cpu/sat_counter.hh"
|
|
|
|
SatCounter::SatCounter()
|
|
: maxVal(0), counter(0)
|
|
{
|
|
}
|
|
|
|
SatCounter::SatCounter(unsigned bits)
|
|
: maxVal((1 << bits) - 1), counter(0)
|
|
{
|
|
}
|
|
|
|
SatCounter::SatCounter(unsigned bits, unsigned initial_val)
|
|
: maxVal((1 << bits) - 1), counter(initial_val)
|
|
{
|
|
// Check to make sure initial value doesn't exceed the max counter value.
|
|
if (initial_val > maxVal) {
|
|
panic("BP: Initial counter value exceeds max size.");
|
|
}
|
|
}
|
|
|
|
void
|
|
SatCounter::setBits(unsigned bits)
|
|
{
|
|
maxVal = (1 << bits) - 1;
|
|
}
|
|
|
|
void
|
|
SatCounter::increment()
|
|
{
|
|
if(counter < maxVal) {
|
|
++counter;
|
|
}
|
|
}
|
|
|
|
void
|
|
SatCounter::decrement()
|
|
{
|
|
if(counter > 0) {
|
|
--counter;
|
|
}
|
|
}
|