Count number of 0's from the most significant bit to the least stopping at the first 1.

Synopsis

Declared in <llvm/ADT/bit.h>

template<typename T>
[[nodiscard]]
constexpr
int
countl_zero_constexpr(T Val);

Description

A constexpr version of countl_zero.

Only unsigned integral types are allowed.

Returns std::numeric_limits<T>::digits on an input of 0.

Return Value

Note

The return value should not be discarded.

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