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/*
* Copyright (c) 2004-2005 The Regents of The University of Michigan
* Copyright (c) 2013 Advanced Micro Devices, Inc.
* 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.
*
* Authors: Kevin Lim
* Gabe Black
* Steve Reinhardt
*/
#include "cpu/o3/regfile.hh"
#include "cpu/o3/free_list.hh"
PhysRegFile::PhysRegFile(unsigned _numPhysicalIntRegs,
unsigned _numPhysicalFloatRegs,
unsigned _numPhysicalCCRegs)
: intRegFile(_numPhysicalIntRegs),
floatRegFile(_numPhysicalFloatRegs),
ccRegFile(_numPhysicalCCRegs),
numPhysicalIntRegs(_numPhysicalIntRegs),
numPhysicalFloatRegs(_numPhysicalFloatRegs),
numPhysicalCCRegs(_numPhysicalCCRegs),
totalNumRegs(_numPhysicalIntRegs
+ _numPhysicalFloatRegs
+ _numPhysicalCCRegs)
{
PhysRegIndex phys_reg;
PhysRegIndex flat_reg_idx = 0;
if (TheISA::NumCCRegs == 0 && _numPhysicalCCRegs != 0) {
// Just make this a warning and go ahead and allocate them
// anyway, to keep from having to add checks everywhere
warn("Non-zero number of physical CC regs specified, even though\n"
" ISA does not use them.\n");
}
// The initial batch of registers are the integer ones
for (phys_reg = 0; phys_reg < numPhysicalIntRegs; phys_reg++) {
intRegIds.emplace_back(IntRegClass, phys_reg, flat_reg_idx++);
}
// The next batch of the registers are the floating-point physical
// registers; put them onto the floating-point free list.
for (phys_reg = 0; phys_reg < numPhysicalFloatRegs; phys_reg++) {
floatRegIds.emplace_back(FloatRegClass, phys_reg, flat_reg_idx++);
}
// The rest of the registers are the condition-code physical
// registers; put them onto the condition-code free list.
for (phys_reg = 0; phys_reg < numPhysicalCCRegs; phys_reg++) {
ccRegIds.emplace_back(CCRegClass, phys_reg, flat_reg_idx++);
}
// Misc regs have a fixed mapping but still need PhysRegIds.
for (phys_reg = 0; phys_reg < TheISA::NumMiscRegs; phys_reg++) {
miscRegIds.emplace_back(MiscRegClass, phys_reg, 0);
}
}
void
PhysRegFile::initFreeList(UnifiedFreeList *freeList)
{
// Initialize the free lists.
int reg_idx = 0;
// The initial batch of registers are the integer ones
for (reg_idx = 0; reg_idx < numPhysicalIntRegs; reg_idx++) {
assert(intRegIds[reg_idx].index() == reg_idx);
freeList->addIntReg(&intRegIds[reg_idx]);
}
// The next batch of the registers are the floating-point physical
// registers; put them onto the floating-point free list.
for (reg_idx = 0; reg_idx < numPhysicalFloatRegs; reg_idx++) {
assert(floatRegIds[reg_idx].index() == reg_idx);
freeList->addFloatReg(&floatRegIds[reg_idx]);
}
// The rest of the registers are the condition-code physical
// registers; put them onto the condition-code free list.
for (reg_idx = 0; reg_idx < numPhysicalCCRegs; reg_idx++) {
assert(ccRegIds[reg_idx].index() == reg_idx);
freeList->addCCReg(&ccRegIds[reg_idx]);
}
}
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