bsf()

constexpr std::uint8_t Chusov::Memory::bsf ( T  val )

constexprnoexcept

Returns an index of the rightmost (least significant) nonzero bit of an integer.

Template Parameters

T	A deduced integral type of the parameter.

Parameters

val	The integral value in which the function scans the least significant nonzero bit.

Returns

An index of the least significant nonzero bit within the integer val. If val is zero, i.e. all bits of it are reset, the function returns a size of an object of the type T in bits.

Assuming that val = x, \(x \ne 0\) and \(x = x'\cdot 2^f\), where \(x, x'\in\mathbb{Z}\), and \(x'\) is odd, the function returns the value \(f = \log_2\frac{x}{x'}\).

The function requires that a size of a byte is exactly eight bits.

See also

bsr.