Function bitwise::word::align_down

pub fn align_down<T: Word, U: UnsignedWord>(x: T, alignment: U) -> T

Align x down to alignment.

Returns n, where n is the greatest number <= x and is_aligned(n, alignment).

Panics

alignment must be a power of two.

Examples

use bitwise::word::*;

assert_eq!(2.align_down(1u8), 2);
assert_eq!(align_down(2, 2u8), 2);
assert_eq!(2.align_down(4u8), 0);
assert_eq!(2.align_down(8u8), 0);

assert_eq!(3.align_down(1u8), 3);
assert_eq!(3.align_down(2u8), 2);
assert_eq!(3.align_down(4u8), 0);
assert_eq!(3.align_down(8u8), 0);

assert_eq!(4.align_down(1u8), 4);
assert_eq!(4.align_down(2u8), 4);
assert_eq!(4.align_down(4u8), 4);
assert_eq!(4.align_down(8u8), 0);