OLD | NEW |
1 // Copyright 2015 the V8 project authors. All rights reserved. | 1 // Copyright 2015 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 var stdlib = { Math: Math }; | 5 var stdlib = { Math: Math }; |
6 | 6 |
7 var f = (function Module(stdlib) { | 7 var f = (function Module(stdlib) { |
8 "use asm"; | 8 "use asm"; |
9 | 9 |
10 var clz32 = stdlib.Math.clz32; | 10 var clz32 = stdlib.Math.clz32; |
11 | 11 |
12 function f(a) { | 12 function f(a) { |
13 a = a >>> 0; | 13 a = a | 0; |
14 return clz32(a)|0; | 14 return clz32(a >>> 0) | 0; |
15 } | 15 } |
16 | 16 |
17 return f; | 17 return f; |
18 })(stdlib); | 18 })(stdlib); |
19 | 19 |
20 assertEquals(32, f(0)); | 20 assertEquals(32, f(0)); |
21 assertEquals(32, f(NaN)); | 21 assertEquals(32, f(NaN)); |
22 assertEquals(32, f(undefined)); | 22 assertEquals(32, f(undefined)); |
23 for (var i = 0; i < 32; ++i) { | 23 for (var i = 0; i < 32; ++i) { |
24 assertEquals(i, f((-1) >>> i)); | 24 assertEquals(i, f((-1) >>> i)); |
25 } | 25 } |
26 for (var i = -2147483648; i < 2147483648; i += 3999773) { | 26 for (var i = -2147483648; i < 2147483648; i += 3999773) { |
27 assertEquals(Math.clz32(i), f(i)); | 27 assertEquals(Math.clz32(i), f(i)); |
28 } | 28 } |
OLD | NEW |