33 lines
861 B
Solidity
33 lines
861 B
Solidity
pragma solidity 0.5.13;
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library Math {
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function add512(uint x0, uint64 x1, uint y0, uint64 y1) internal pure returns (uint z0, uint64 z1) {
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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, uint64 y) internal pure returns (uint z0, uint64 z1) {
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assembly {
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let mm := mulmod(x, y, not(0))
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z0 := mul(x, y)
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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 x) internal pure returns (uint y) {
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if (x == 0) return 0;
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else if (x <= 3) return 1;
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uint z = (x + 1) / 2;
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y = x;
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while (z < y) {
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y = z;
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z = (x / z + z) / 2;
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}
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}
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}
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