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Documentation Index

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This library provides functionality for computing bit properties of an unsigned integer

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Functions

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mostSignificantBit

  function mostSignificantBit(
    uint256 x
  ) internal pure returns (uint8 r)
Returns the index of the most significant bit of the number, where the least significant bit is at index 0 and the most significant bit is at index 255 The function satisfies the property: x >= 2mostSignificantBit(x) and x < 2(mostSignificantBit(x)+1)

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Parameters:

NameTypeDescription
xuint256the value for which to compute the most significant bit, must be greater than 0

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Return Values:

NameTypeDescription
ruint8the index of the most significant bit

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leastSignificantBit

  function leastSignificantBit(
    uint256 x
  ) internal pure returns (uint8 r)
Returns the index of the least significant bit of the number, where the least significant bit is at index 0 and the most significant bit is at index 255 The function satisfies the property: (x & 2leastSignificantBit(x)) != 0 and (x & (2(leastSignificantBit(x)) - 1)) == 0)

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Parameters:

NameTypeDescription
xuint256the value for which to compute the least significant bit, must be greater than 0

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Return Values:

NameTypeDescription
ruint8the index of the least significant bit