blob: d8083ea31a41bc6cf317c586c8d2f39155a4ce6b [file] [log] [blame]
/*
* Copyright (c) 2015-2017 Advanced Micro Devices, Inc.
* All rights reserved.
*
* For use for simulation and test purposes only
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder 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 HOLDER 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: John Kalamatianos,
* Mark Wyse
*/
#include "gpu-compute/scalar_register_file.hh"
#include "base/logging.hh"
#include "debug/GPUSRF.hh"
#include "gpu-compute/compute_unit.hh"
#include "gpu-compute/gpu_dyn_inst.hh"
#include "gpu-compute/shader.hh"
#include "gpu-compute/wavefront.hh"
#include "params/ScalarRegisterFile.hh"
ScalarRegisterFile::ScalarRegisterFile(const ScalarRegisterFileParams &p)
: RegisterFile(p)
{
regFile.resize(numRegs(), 0);
}
bool
ScalarRegisterFile::operandsReady(Wavefront *w, GPUDynInstPtr ii) const
{
for (int i = 0; i < ii->getNumOperands(); ++i) {
if (ii->isScalarRegister(i) && ii->isSrcOperand(i)) {
int sgprIdx = ii->getRegisterIndex(i, ii);
int nRegs = ii->getOperandSize(i) <= 4 ? 1 :
ii->getOperandSize(i) / 4;
for (int j = 0; j < nRegs; ++j) {
int pSgpr =
computeUnit->registerManager->mapSgpr(w, sgprIdx + j);
if (regBusy(pSgpr)) {
if (ii->isDstOperand(i)) {
w->numTimesBlockedDueWAXDependencies++;
} else if (ii->isSrcOperand(i)) {
DPRINTF(GPUSRF, "RAW stall: WV[%d]: %s: physReg[%d]\n",
w->wfDynId, ii->disassemble(), pSgpr);
w->numTimesBlockedDueRAWDependencies++;
}
return false;
}
} // nRegs
} // isScalar
} // operand
return true;
}
void
ScalarRegisterFile::scheduleWriteOperands(Wavefront *w, GPUDynInstPtr ii)
{
// iterate over all register destination operands
for (int i = 0; i < ii->getNumOperands(); ++i) {
if (ii->isScalarRegister(i) && ii->isDstOperand(i)) {
int sgprIdx = ii->getRegisterIndex(i, ii);
int nRegs = ii->getOperandSize(i) <= 4 ? 1 :
ii->getOperandSize(i) / 4;
for (int j = 0; j < nRegs; ++j) {
int physReg =
computeUnit->registerManager->mapSgpr(w, sgprIdx + j);
// mark the destination scalar register as busy
markReg(physReg, true);
}
}
}
}
void
ScalarRegisterFile::waveExecuteInst(Wavefront *w, GPUDynInstPtr ii)
{
for (int i = 0; i < ii->getNumOperands(); i++) {
if (ii->isScalarRegister(i) && ii->isSrcOperand(i)) {
int DWORDs = ii->getOperandSize(i) <= 4 ? 1
: ii->getOperandSize(i) / 4;
registerReads += DWORDs;
}
}
if (!ii->isLoad() && !(ii->isAtomic() || ii->isMemSync())) {
Cycles delay(computeUnit->scalarPipeLength());
Tick tickDelay = computeUnit->cyclesToTicks(delay);
for (int i = 0; i < ii->getNumOperands(); i++) {
if (ii->isScalarRegister(i) && ii->isDstOperand(i)) {
int sgprIdx = ii->getRegisterIndex(i, ii);
int nRegs = ii->getOperandSize(i) <= 4 ? 1
: ii->getOperandSize(i) / 4;
for (int j = 0; j < nRegs; j++) {
int physReg = computeUnit->registerManager->
mapSgpr(w, sgprIdx + j);
enqRegFreeEvent(physReg, tickDelay);
}
registerWrites += nRegs;
}
}
}
}
void
ScalarRegisterFile::scheduleWriteOperandsFromLoad(Wavefront *w,
GPUDynInstPtr ii)
{
assert(ii->isLoad() || ii->isAtomicRet());
for (int i = 0; i < ii->getNumOperands(); ++i) {
if (ii->isScalarRegister(i) && ii->isDstOperand(i)) {
int sgprIdx = ii->getRegisterIndex(i, ii);
int nRegs = ii->getOperandSize(i) <= 4 ? 1 :
ii->getOperandSize(i) / 4;
for (int j = 0; j < nRegs; ++j) {
int physReg = computeUnit->registerManager->
mapSgpr(w, sgprIdx + j);
enqRegFreeEvent(physReg, computeUnit->clockPeriod());
}
registerWrites += nRegs;
}
}
}