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/*
* 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/trace.hh"
#include "cpu/o3/free_list.hh"
SimpleFreeList::SimpleFreeList(unsigned _numLogicalIntRegs,
unsigned _numPhysicalIntRegs,
unsigned _numLogicalFloatRegs,
unsigned _numPhysicalFloatRegs)
: numLogicalIntRegs(_numLogicalIntRegs),
numPhysicalIntRegs(_numPhysicalIntRegs),
numLogicalFloatRegs(_numLogicalFloatRegs),
numPhysicalFloatRegs(_numPhysicalFloatRegs),
numPhysicalRegs(numPhysicalIntRegs + numPhysicalFloatRegs)
{
DPRINTF(FreeList, "FreeList: Creating new free list object.\n");
// DEBUG stuff.
freeIntRegsScoreboard.resize(numPhysicalIntRegs);
freeFloatRegsScoreboard.resize(numPhysicalRegs);
for (PhysRegIndex i = 0; i < numLogicalIntRegs; ++i) {
freeIntRegsScoreboard[i] = 0;
}
// Put all of the extra physical registers onto the free list. This
// means excluding all of the base logical registers.
for (PhysRegIndex i = numLogicalIntRegs;
i < numPhysicalIntRegs; ++i)
{
freeIntRegs.push(i);
freeIntRegsScoreboard[i] = 1;
}
for (PhysRegIndex i = 0; i < numPhysicalIntRegs + numLogicalFloatRegs;
++i)
{
freeFloatRegsScoreboard[i] = 0;
}
// Put all of the extra physical registers onto the free list. This
// means excluding all of the base logical registers. Because the
// float registers' indices start where the physical registers end,
// some math must be done to determine where the free registers start.
for (PhysRegIndex i = numPhysicalIntRegs + numLogicalFloatRegs;
i < numPhysicalRegs; ++i)
{
freeFloatRegs.push(i);
freeFloatRegsScoreboard[i] = 1;
}
}
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