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2dcc3665ab
PR-URL: https://github.com/nodejs/node/pull/28016 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Refael Ackermann (רפאל פלחי) <refack@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
38 lines
924 B
JavaScript
38 lines
924 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: --allow-natives-syntax
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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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function f(e) {
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var max = Math.pow(2, e);
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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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}
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%PrepareFunctionForOptimization(f);
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f(5);
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f(5);
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%OptimizeFunctionOnNextCall(f);
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f(40);
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