33 lines
953 B
Solidity
33 lines
953 B
Solidity
pragma solidity 0.5.13;
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library Math {
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function add512(uint x0, uint x1, uint y0, uint y1) internal pure returns (uint z0, uint z1) {
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assembly { // solium-disable-line security/no-inline-assembly
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z0 := add(x0, y0)
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z1 := add(add(x1, y1), lt(z0, x0))
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}
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}
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function mul512(uint x, uint y) internal pure returns (uint z0, uint z1) {
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assembly { // solium-disable-line security/no-inline-assembly
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z0 := mul(x, y)
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let mm := mulmod(x, y, not(0))
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z1 := sub(sub(mm, z0), lt(mm, z0))
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}
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}
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function min(uint x, uint y) internal pure returns (uint z) {
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return x <= y ? x : y;
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}
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function sqrt(uint y) internal pure returns (uint z) {
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if (y == 0) return 0;
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else if (y <= 3) return 1;
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uint x = (y + 1) / 2;
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z = y;
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while (x < z) {
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z = x;
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x = (y / x + x) / 2;
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}
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}
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}
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