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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 // Flags: --allow-natives-syntax | 5 // Flags: --allow-natives-syntax |
6 | 6 |
7 var stdlib = { Math: Math }; | 7 var stdlib = { Math: Math }; |
8 | 8 |
9 var f = (function Module(stdlib) { | 9 var f = (function Module(stdlib) { |
10 "use asm"; | 10 "use asm"; |
11 | 11 |
12 var clz32 = stdlib.Math.clz32; | 12 var clz32 = stdlib.Math.clz32; |
13 | 13 |
14 function f(a) { | 14 function f(a) { |
15 a = a >>> 0; | 15 a = a >>> 0; |
16 return clz32(a)|0; | 16 return clz32(a)|0; |
17 } | 17 } |
18 | 18 |
19 return f; | 19 return f; |
20 })(stdlib); | 20 })(stdlib); |
21 | 21 |
22 assertEquals(32, f(0)); | 22 assertEquals(32, f(0)); |
23 assertEquals(32, f(NaN)); | 23 assertEquals(32, f(NaN)); |
24 assertEquals(32, f(undefined)); | 24 assertEquals(32, f(undefined)); |
25 for (var i = 0; i < 32; ++i) { | 25 for (var i = 0; i < 32; ++i) { |
26 assertEquals(i, f((-1) >>> i)); | 26 assertEquals(i, f((-1) >>> i)); |
27 } | 27 } |
28 for (var i = -2147483648; i < 2147483648; i += 3999773) { | 28 for (var i = -2147483648; i < 2147483648; i += 3999773) { |
29 assertEquals(%MathClz32(i), f(i)); | 29 assertEquals(%MathClz32(i), f(i)); |
30 assertEquals(%_MathClz32(i), f(i)); | 30 assertEquals(%MathClz32(i), %_MathClz32(i >>> 0)); |
31 } | 31 } |
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