Function std::intrinsics::cttz

pub unsafe extern "rust-intrinsic" fn cttz<T>(x: T) -> T

Returns the number of trailing unset bits (zeroes) in an integer type T.

Examples

#![feature(core_intrinsics)]

use std::intrinsics::cttz;

let x = 0b0011_1000_u8;
let num_trailing = unsafe { cttz(x) };
assert_eq!(num_trailing, 3);

An x with value 0 will return the bit width of T:

#![feature(core_intrinsics)]

use std::intrinsics::cttz;

let x = 0u16;
let num_trailing = unsafe { cttz(x) };
assert_eq!(num_trailing, 16);