git.r.bdr.sh - rbdr/dotfiles/blob - atom/packages/vim-mode/node_modules/grim/node_modules/emissary/node_modules/es6-weak-map/node_modules/es5-ext/math/imul/shim.js

   1 // Thanks: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference
   2 //         /Global_Objects/Math/imul
   3
   4 'use strict';
   5
   6 module.exports = function (x, y) {
   7         var xh  = (x >>> 16) & 0xffff, xl = x & 0xffff
   8           , yh  = (y >>> 16) & 0xffff, yl = y & 0xffff;
   9
  10         // the shift by 0 fixes the sign on the high part
  11         // the final |0 converts the unsigned value into a signed value
  12         return ((xl * yl) + (((xh * yl + xl * yh) << 16) >>> 0) | 0);
  13 };