Count the number of ones from the most significant bit to the first zero bit.
Synopsis
Declared in <llvm/ADT/bit.h>
template<typename T>
[[nodiscard]]
int
countl_one(T Value);Description
Ex. countl_one(0xFF0FFF00) == 8. Only unsigned integral types are allowed.
Returns std::numeric_limits<T>::digits on an input of all ones.
Return Value
Leading one count, or std::numeric_limits<T>::digits if all bits are set.
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Note
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The return value should not be discarded. |
Parameters
Name |
Description |
Value |
Unsigned value to scan from the most significant bit. |
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