mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
108 lines
3.2 KiB
C++
108 lines
3.2 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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// SPDX-License-Identifier: GPL-3.0
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#include <tools/yulPhaser/PairSelections.h>
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#include <tools/yulPhaser/Selections.h>
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#include <tools/yulPhaser/SimulationRNG.h>
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#include <cmath>
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using namespace std;
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using namespace solidity::phaser;
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vector<tuple<size_t, size_t>> RandomPairSelection::materialise(size_t _poolSize) const
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{
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if (_poolSize < 2)
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return {};
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auto count = static_cast<size_t>(round(_poolSize * m_selectionSize));
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vector<tuple<size_t, size_t>> selection;
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for (size_t i = 0; i < count; ++i)
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{
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size_t index1 = SimulationRNG::uniformInt(0, _poolSize - 1);
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size_t index2;
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do
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{
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index2 = SimulationRNG::uniformInt(0, _poolSize - 1);
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} while (index1 == index2);
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selection.emplace_back(index1, index2);
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}
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return selection;
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}
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vector<tuple<size_t, size_t>> PairsFromRandomSubset::materialise(size_t _poolSize) const
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{
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vector<size_t> selectedIndices = RandomSubset(m_selectionChance).materialise(_poolSize);
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if (selectedIndices.size() % 2 != 0)
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{
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if (selectedIndices.size() < _poolSize && SimulationRNG::bernoulliTrial(0.5))
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{
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do
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{
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size_t extraIndex = SimulationRNG::uniformInt(0, selectedIndices.size() - 1);
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if (find(selectedIndices.begin(), selectedIndices.end(), extraIndex) == selectedIndices.end())
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selectedIndices.push_back(extraIndex);
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} while (selectedIndices.size() % 2 != 0);
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}
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else
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selectedIndices.erase(
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selectedIndices.begin() +
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static_cast<ptrdiff_t>(SimulationRNG::uniformInt(0, selectedIndices.size() - 1))
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);
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}
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assert(selectedIndices.size() % 2 == 0);
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vector<tuple<size_t, size_t>> selectedPairs;
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for (size_t i = selectedIndices.size() / 2; i > 0; --i)
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{
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size_t position1 = SimulationRNG::uniformInt(0, selectedIndices.size() - 1);
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size_t value1 = selectedIndices[position1];
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selectedIndices.erase(selectedIndices.begin() + static_cast<ptrdiff_t>(position1));
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size_t position2 = SimulationRNG::uniformInt(0, selectedIndices.size() - 1);
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size_t value2 = selectedIndices[position2];
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selectedIndices.erase(selectedIndices.begin() + static_cast<ptrdiff_t>(position2));
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selectedPairs.emplace_back(value1, value2);
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}
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assert(selectedIndices.empty());
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return selectedPairs;
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}
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vector<tuple<size_t, size_t>> PairMosaicSelection::materialise(size_t _poolSize) const
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{
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if (_poolSize < 2)
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return {};
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size_t count = static_cast<size_t>(round(_poolSize * m_selectionSize));
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vector<tuple<size_t, size_t>> selection;
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for (size_t i = 0; i < count; ++i)
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{
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tuple<size_t, size_t> pair = m_pattern[i % m_pattern.size()];
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selection.emplace_back(min(get<0>(pair), _poolSize - 1), min(get<1>(pair), _poolSize - 1));
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}
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return selection;
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}
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