17 lines
499 B
JavaScript
17 lines
499 B
JavaScript
/* eslint no-bitwise: "off" */
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// Thanks: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference
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// /Global_Objects/Math/imul
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"use strict";
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module.exports = function (val1, val2) {
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var xh = (val1 >>> 16) & 0xffff
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, xl = val1 & 0xffff
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, yh = (val2 >>> 16) & 0xffff
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, yl = val2 & 0xffff;
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// The shift by 0 fixes the sign on the high part
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// the final |0 converts the unsigned value into a signed value
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return (xl * yl + (((xh * yl + xl * yh) << 16) >>> 0)) | 0;
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};
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