1 // Copyright 2014 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Flags: --allow-natives-syntax 6 7 [NaN, Infinity, -Infinity, 0, -0, "abc", "Infinity", "-Infinity", {}].forEach( 8 function(x) { 9 assertEquals(32, Math.clz32(x)); 10 } 11 ); 12 13 function testclz(x) { 14 for (var i = 0; i < 33; i++) { 15 if (x & 0x80000000) return i; 16 x <<= 1; 17 } 18 return 32; 19 } 20 21 22 function f(e) { 23 var max = Math.pow(2, e); 24 for (var x = 0; x < max; x = x * 1.01 + 1) { 25 assertEquals(testclz(x), Math.clz32(x)); 26 assertEquals(testclz(-x), Math.clz32(-x)); 27 assertEquals(testclz(x), Math.clz32({ valueOf: function() { return x; } })); 28 assertEquals(testclz(-x), 29 Math.clz32({ toString: function() { return -x; } })); 30 } 31 } 32 33 f(5); 34 f(5); 35 %OptimizeFunctionOnNextCall(f); 36 f(40); 37
