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17 lines
499 B
17 lines
499 B
/* 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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