22 lines
654 B
JavaScript
22 lines
654 B
JavaScript
var $ = require('../internals/export');
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var fails = require('../internals/fails');
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var nativeImul = Math.imul;
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var FORCED = fails(function () {
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return nativeImul(0xFFFFFFFF, 5) != -5 || nativeImul.length != 2;
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});
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// `Math.imul` method
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// https://tc39.github.io/ecma262/#sec-math.imul
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// some WebKit versions fails with big numbers, some has wrong arity
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$({ target: 'Math', stat: true, forced: FORCED }, {
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imul: function imul(x, y) {
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var UINT16 = 0xFFFF;
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var xn = +x;
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var yn = +y;
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var xl = UINT16 & xn;
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var yl = UINT16 & yn;
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return 0 | xl * yl + ((UINT16 & xn >>> 16) * yl + xl * (UINT16 & yn >>> 16) << 16 >>> 0);
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}
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});
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