be7b023a5c
R=dslomov@chromium.org, svenpanne@chromium.org BUG=v8:2938 LOG=N Review URL: https://codereview.chromium.org/169783002 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19435 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
29 lines
795 B
JavaScript
29 lines
795 B
JavaScript
// Copyright 2014 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --harmony-maths
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[NaN, Infinity, -Infinity, 0, -0, "abc", "Infinity", "-Infinity", {}].forEach(
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function(x) {
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assertEquals(32, Math.clz32(x));
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}
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);
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function testclz(x) {
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for (var i = 0; i < 33; i++) {
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if (x & 0x80000000) return i;
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x <<= 1;
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}
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return 32;
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}
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var max = Math.pow(2, 40);
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for (var x = 0; x < max; x = x * 1.01 + 1) {
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assertEquals(testclz(x), Math.clz32(x));
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assertEquals(testclz(-x), Math.clz32(-x));
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assertEquals(testclz(x), Math.clz32({ valueOf: function() { return x; } }));
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assertEquals(testclz(-x),
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Math.clz32({ toString: function() { return -x; } }));
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}
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