Function bitwise::word::count_leading_zeros [−] [src]

pub fn count_leading_zeros<T: Word>(x: T) -> T

Counts the number of leading zeros in the binary representation of x.

Keywords:

Count leading zeros.

Intrinsics:

  • ABM: lzcnt.
  • BMI 1.0: lzcnt.
  • ARMv5: clz.
  • PowerPC: cntlzd.
  • gcc/llvm builtin: x == 0 ? mem::size_of(x) * 8 : __builtin_clz(x).

Examples

use bitwise::word::*;

let n = 0b0010_1000u16;

assert_eq!(n.count_leading_zeros(), 10);
assert_eq!(count_leading_zeros(n), 10);