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VecRegs.cpp
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VecRegs.cpp
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// Copyright 2020 Western Digital Corporation or its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <iostream>
#include <cmath>
#include <string.h>
#include "VecRegs.hpp"
using namespace WdRiscv;
VecRegs::VecRegs()
{
// Intialize structure (vector of vectors) defining legal
// element-width/group-multiplier combinations to all false: No
// combination is supported. Configuration code will later change
// this.
legalConfigs_.resize(size_t(VecEnums::WidthLimit));
for (auto& groupFlags : legalConfigs_)
groupFlags.resize(size_t(VecEnums::GroupLimit));
// Start by making all combinations of width/grouping legal. This
// gets adjusted when config method is called.
for (auto& groupFlags : legalConfigs_)
groupFlags.assign(groupFlags.size(), true);
// Operands effective group multiplier is used for tracing/logging.
// Worst case we have 3 vector operands.
opsEmul_.resize(3);
opsEmul_.assign(opsEmul_.size(), 1);
}
VecRegs::~VecRegs()
{
regCount_ = 0;
bytesPerReg_ = 0;
bytesInRegFile_ = 0;
delete [] data_;
data_ = nullptr;
}
void
VecRegs::config(unsigned bytesPerReg, unsigned minBytesPerElem,
unsigned maxBytesPerElem)
{
if (bytesPerReg > 4096)
{
std::cerr << "VecRegs::configure: bytes-per-register too large (" << bytesPerReg
<< ") -- using 4096\n";
bytesPerReg = 4096;
}
if (bytesPerReg <= 4)
{
std::cerr << "VecRegs::configure: bytes-per-register too small (" << bytesPerReg
<< ") -- using 4\n";
bytesPerReg = 4;
}
unsigned l2BytesPerReg = std::log2(bytesPerReg);
unsigned p2BytesPerReg = uint32_t(1) << l2BytesPerReg;
if (p2BytesPerReg != bytesPerReg)
{
std::cerr << "VecRegs::configure: bytes-per-register (" << bytesPerReg
<< ") not a power of 2 -- using " << p2BytesPerReg << "\n";
bytesPerReg = p2BytesPerReg;
}
if (minBytesPerElem < 1)
{
std:: cerr << "VecRegd::configure: zero min-bytes-per-element -- using 1\n";
minBytesPerElem = 1;
}
if (maxBytesPerElem < 1)
{
std:: cerr << "VecRegd::configure: zero max-bytes-per-element -- using 1\n";
maxBytesPerElem = 1;
}
if (minBytesPerElem > maxBytesPerElem)
{
std:: cerr << "VecRegd::configure: min-bytes-per-elem larger than max -- using max\n";
minBytesPerElem = maxBytesPerElem;
}
unsigned l2BytesPerElem = std::log2(maxBytesPerElem);
unsigned p2BytesPerElem = uint32_t(1) << l2BytesPerElem;
if (p2BytesPerElem != maxBytesPerElem)
{
std::cerr << "VecRegs::configure: max-bytes-per-element (" << maxBytesPerElem
<< ") not a power of 2 -- using " << p2BytesPerElem << "\n";
maxBytesPerElem = p2BytesPerElem;
}
if (maxBytesPerElem > bytesPerReg)
{
std::cerr << "VecRegs::configure: max-bytes-per-element (" << maxBytesPerElem
<< ") is greater than the bytes-per-register (" << bytesPerReg
<< " -- using " << bytesPerReg << "\n";
maxBytesPerElem = bytesPerReg;
}
l2BytesPerElem = std::log2(minBytesPerElem);
p2BytesPerElem = uint32_t(1) << l2BytesPerElem;
if (p2BytesPerElem != minBytesPerElem)
{
std::cerr << "VecRegs::configure: min-bytes-per-element (" << minBytesPerElem
<< ") not a power of 2 -- using " << p2BytesPerElem << "\n";
minBytesPerElem = p2BytesPerElem;
}
if (minBytesPerElem > bytesPerReg)
{
std::cerr << "VecRegs::configure: min-bytes-per-element (" << minBytesPerElem
<< ") is greater than the bytes-per-register (" << bytesPerReg
<< " -- using " << bytesPerReg << "\n";
minBytesPerElem = bytesPerReg;
}
regCount_ = 32;
bytesPerReg_ = bytesPerReg;
minBytesPerElem_ = minBytesPerElem;
maxBytesPerElem_ = maxBytesPerElem;
bytesInRegFile_ = regCount_ * bytesPerReg_;
// Make illegal all group entries for element-widths greater than
// the max-element-width (which is in bytesPerElem_) or smaller
// than the min-element-width.
for (unsigned i = 0; i <= unsigned(ElementWidth::Word32); ++i)
{
ElementWidth ew = ElementWidth(i);
unsigned bytes = VecRegs::elementWidthInBytes(ew);
if (bytes > maxBytesPerElem_ or bytes < minBytesPerElem_ )
{
auto& groupFlags = legalConfigs_.at(size_t(ew));
groupFlags.assign(groupFlags.size(), false);
}
}
delete [] data_;
data_ = new uint8_t[bytesInRegFile_];
memset(data_, 0, bytesInRegFile_);
}
void
VecRegs::reset()
{
if (data_)
memset(data_, 0, bytesInRegFile_);
lastWrittenReg_ = -1;
lastGroupX8_ = 8;
}