mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
41 lines
1.2 KiB
C++
41 lines
1.2 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 <libsolutil/Numeric.h>
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#include <liblangutil/Exceptions.h>
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using namespace solidity;
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bool solidity::fitsPrecisionBaseX(bigint const& _mantissa, double _log2OfBase, uint32_t _exp)
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{
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if (_mantissa == 0)
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return true;
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solAssert(_mantissa > 0, "");
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size_t const bitsMax = 4096;
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unsigned mostSignificantMantissaBit = boost::multiprecision::msb(_mantissa);
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if (mostSignificantMantissaBit > bitsMax) // _mantissa >= 2 ^ 4096
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return false;
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bigint bitsNeeded = mostSignificantMantissaBit + bigint(floor(double(_exp) * _log2OfBase)) + 1;
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return bitsNeeded <= bitsMax;
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}
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