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14 lines
445 B
14 lines
445 B
10 years ago
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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 (x, y) {
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var xh = (x >>> 16) & 0xffff, xl = x & 0xffff
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, yh = (y >>> 16) & 0xffff, yl = y & 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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