es7.math.umulh.js 440 B

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  1. // https://gist.github.com/BrendanEich/4294d5c212a6d2254703
  2. var $export = require('./_export');
  3. $export($export.S, 'Math', {
  4. umulh: function umulh(u, v){
  5. var UINT16 = 0xffff
  6. , $u = +u
  7. , $v = +v
  8. , u0 = $u & UINT16
  9. , v0 = $v & UINT16
  10. , u1 = $u >>> 16
  11. , v1 = $v >>> 16
  12. , t = (u1 * v0 >>> 0) + (u0 * v0 >>> 16);
  13. return u1 * v1 + (t >>> 16) + ((u0 * v1 >>> 0) + (t & UINT16) >>> 16);
  14. }
  15. });