23 lines
716 B
JavaScript
23 lines
716 B
JavaScript
// 20.2.2.16 Math.fround(x)
|
|
var sign = require('./_math-sign');
|
|
var pow = Math.pow;
|
|
var EPSILON = pow(2, -52);
|
|
var EPSILON32 = pow(2, -23);
|
|
var MAX32 = pow(2, 127) * (2 - EPSILON32);
|
|
var MIN32 = pow(2, -126);
|
|
|
|
var roundTiesToEven = function (n) {
|
|
return n + 1 / EPSILON - 1 / EPSILON;
|
|
};
|
|
|
|
module.exports = Math.fround || function fround(x) {
|
|
var $abs = Math.abs(x);
|
|
var $sign = sign(x);
|
|
var a, result;
|
|
if ($abs < MIN32) return $sign * roundTiesToEven($abs / MIN32 / EPSILON32) * MIN32 * EPSILON32;
|
|
a = (1 + EPSILON32 / EPSILON) * $abs;
|
|
result = a - (a - $abs);
|
|
// eslint-disable-next-line no-self-compare
|
|
if (result > MAX32 || result != result) return $sign * Infinity;
|
|
return $sign * result;
|
|
};
|