17 lines
534 B
JavaScript
17 lines
534 B
JavaScript
// 20.2.2.18 Math.imul(x, y)
|
|
var $export = require('./$.export')
|
|
, $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
|
|
, xn = +x
|
|
, yn = +y
|
|
, xl = UINT16 & xn
|
|
, yl = UINT16 & yn;
|
|
return 0 | xl * yl + ((UINT16 & xn >>> 16) * yl + xl * (UINT16 & yn >>> 16) << 16 >>> 0);
|
|
}
|
|
}); |