Count leading zeros

clz.js

/**
 * Count leading zeros in binary representation
 * @param {number} m
 * @return {number} 0-32
 */
export default function clz(m) {
  let c = 1 << 31, i;
  for (let i = 0; i < 32; i += 1) {
    if (c & m) return i;
    c >>>= 1;
  }
  return 32;
}