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Last change
on this file since e29cc2e was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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100644
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File size:
700 bytes
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| 1 | var $ = require('../internals/export');
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| 2 | var fails = require('../internals/fails');
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| 3 |
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| 4 | // eslint-disable-next-line es/no-math-imul -- required for testing
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| 5 | var $imul = Math.imul;
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| 6 |
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| 7 | var FORCED = fails(function () {
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| 8 | return $imul(0xFFFFFFFF, 5) != -5 || $imul.length != 2;
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| 9 | });
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| 10 |
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| 11 | // `Math.imul` method
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| 12 | // https://tc39.es/ecma262/#sec-math.imul
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| 13 | // some WebKit versions fails with big numbers, some has wrong arity
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| 14 | $({ target: 'Math', stat: true, forced: FORCED }, {
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| 15 | imul: function imul(x, y) {
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| 16 | var UINT16 = 0xFFFF;
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| 17 | var xn = +x;
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| 18 | var yn = +y;
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| 19 | var xl = UINT16 & xn;
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| 20 | var yl = UINT16 & yn;
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| 21 | return 0 | xl * yl + ((UINT16 & xn >>> 16) * yl + xl * (UINT16 & yn >>> 16) << 16 >>> 0);
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| 22 | }
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| 23 | });
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