| var $ = require('../internals/export'); |
| var fails = require('../internals/fails'); |
| |
| var nativeImul = Math.imul; |
| |
| var FORCED = fails(function () { |
| return nativeImul(0xFFFFFFFF, 5) != -5 || nativeImul.length != 2; |
| }); |
| |
| // `Math.imul` method |
| // https://tc39.github.io/ecma262/#sec-math.imul |
| // some WebKit versions fails with big numbers, some has wrong arity |
| $({ target: 'Math', stat: true, forced: FORCED }, { |
| 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); |
| } |
| }); |