Function core::intrinsics::cttz

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

🔬 This is a nightly-only experimental API. (core_intrinsics)

intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library

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

Note that, unlike most intrinsics, this is safe to call; it does not require an unsafe block. Therefore, implementations must not require the user to uphold any safety invariants.

The stabilized versions of this intrinsic are available on the integer primitives via the trailing_zeros method. For example, u32::trailing_zeros

Examples

#![feature(core_intrinsics)]

use std::intrinsics::cttz;

let x = 0b0011_1000_u8;
let num_trailing = 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 = cttz(x);
assert_eq!(num_trailing, 16);