mirror of https://github.com/jkjoy/sunpeiwen.git
18 lines
539 B
JavaScript
18 lines
539 B
JavaScript
// 20.2.2.18 Math.imul(x, y)
|
|
var $export = require('./_export');
|
|
var $imul = Math.imul;
|
|
|
|
// some WebKit versions fails with big numbers, some has wrong arity
|
|
$export($export.S + $export.F * require('./_fails')(function () {
|
|
return $imul(0xffffffff, 5) != -5 || $imul.length != 2;
|
|
}), 'Math', {
|
|
imul: function imul(x, y) {
|
|
var UINT16 = 0xffff;
|
|
var xn = +x;
|
|
var yn = +y;
|
|
var xl = UINT16 & xn;
|
|
var yl = UINT16 & yn;
|
|
return 0 | xl * yl + ((UINT16 & xn >>> 16) * yl + xl * (UINT16 & yn >>> 16) << 16 >>> 0);
|
|
}
|
|
});
|