mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
59 lines
1.6 KiB
C++
59 lines
1.6 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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#pragma once
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#include <libsmtutil/SolverInterface.h>
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namespace solidity::smtutil
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{
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/// Signed division in SMTLIB2 rounds differently than EVM.
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/// This does not check for division by zero!
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inline Expression signedDivisionEVM(Expression _left, Expression _right)
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{
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return Expression::ite(
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_left >= 0,
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Expression::ite(_right >= 0, _left / _right, 0 - (_left / (0 - _right))),
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Expression::ite(_right >= 0, 0 - ((0 - _left) / _right), (0 - _left) / (0 - _right))
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);
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}
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inline Expression abs(Expression _value)
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{
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return Expression::ite(_value >= 0, _value, 0 - _value);
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}
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/// Signed modulo in SMTLIB2 behaves differently with regards
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/// to the sign than EVM.
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/// This does not check for modulo by zero!
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inline Expression signedModuloEVM(Expression _left, Expression _right)
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{
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return Expression::ite(
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_left >= 0,
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_left % _right,
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Expression::ite(
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(_left % _right) == 0,
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0,
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(_left % _right) - abs(_right)
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)
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);
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}
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}
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