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Last change
on this file since 1ad8e64 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:
864 bytes
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| 1 | var sign = require('../internals/math-sign');
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| 2 |
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| 3 | var abs = Math.abs;
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| 4 | var pow = Math.pow;
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| 5 | var EPSILON = pow(2, -52);
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| 6 | var EPSILON32 = pow(2, -23);
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| 7 | var MAX32 = pow(2, 127) * (2 - EPSILON32);
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| 8 | var MIN32 = pow(2, -126);
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| 9 |
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| 10 | var roundTiesToEven = function (n) {
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| 11 | return n + 1 / EPSILON - 1 / EPSILON;
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| 12 | };
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| 13 |
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| 14 | // `Math.fround` method implementation
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| 15 | // https://tc39.es/ecma262/#sec-math.fround
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| 16 | // eslint-disable-next-line es/no-math-fround -- safe
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| 17 | module.exports = Math.fround || function fround(x) {
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| 18 | var $abs = abs(x);
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| 19 | var $sign = sign(x);
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| 20 | var a, result;
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| 21 | if ($abs < MIN32) return $sign * roundTiesToEven($abs / MIN32 / EPSILON32) * MIN32 * EPSILON32;
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| 22 | a = (1 + EPSILON32 / EPSILON) * $abs;
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| 23 | result = a - (a - $abs);
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| 24 | // eslint-disable-next-line no-self-compare -- NaN check
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| 25 | if (result > MAX32 || result != result) return $sign * Infinity;
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| 26 | return $sign * result;
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| 27 | };
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