You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
18 lines
499 B
18 lines
499 B
4 years ago
|
/* eslint no-bitwise: "off" */
|
||
|
|
|
||
|
|
// Thanks: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference
|
||
|
|
// /Global_Objects/Math/imul
|
||
|
|
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
module.exports = function (val1, val2) {
|
||
|
|
var xh = (val1 >>> 16) & 0xffff
|
||
|
|
, xl = val1 & 0xffff
|
||
|
|
, yh = (val2 >>> 16) & 0xffff
|
||
|
|
, yl = val2 & 0xffff;
|
||
|
|
|
||
|
|
// The shift by 0 fixes the sign on the high part
|
||
|
|
// the final |0 converts the unsigned value into a signed value
|
||
|
|
return (xl * yl + (((xh * yl + xl * yh) << 16) >>> 0)) | 0;
|
||
|
|
};
|