Function clz32Fallback

packages/react-reconciler/src/clz32.js:21–27

(x: number)

const log = Math.log;
const LN2 = Math.LN2;
function clz32Fallback(x: number): number {
  const asUint = x >>> 0;
  if (asUint === 0) {
    return 32;
  }
  return (31 - ((log(asUint) / LN2) | 0)) | 0;
}