BitMath
This library provides functionality for computing bit properties of an unsigned integer
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Functions#
mostSignificantBitReturns 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:Name | Type | Description |
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x | uint256 | the value for which to compute the most significant bit, must be greater than 0 |
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Return Values:Name | Type | Description |
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r | unit8 | the index of the most significant bit |
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leastSignificantBitReturns 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:Name | Type | Description |
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x | uint256 | the value for which to compute the least significant bit, must be greater than 0 |
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Return Values:Name | Type | Description |
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r | unit8 | the index of the least significant bit |