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Edit File: math-abs.js
// Copyright 2010 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // Flags: --max-new-space-size=256 --allow-natives-syntax function zero() { var x = 0.5; return (function() { return x - 0.5; })(); } function test() { assertEquals(0, Math.abs(0)); assertEquals(0, Math.abs(zero())); assertEquals(0, Math.abs(-0)); assertEquals(Infinity, Math.abs(Infinity)); assertEquals(Infinity, Math.abs(-Infinity)); assertEquals(NaN, Math.abs(NaN)); assertEquals(NaN, Math.abs(-NaN)); assertEquals('Infinity', Math.abs(Number('+Infinity')).toString()); assertEquals('Infinity', Math.abs(Number('-Infinity')).toString()); assertEquals('NaN', Math.abs(NaN).toString()); assertEquals('NaN', Math.abs(-NaN).toString()); assertEquals(0.1, Math.abs(0.1)); assertEquals(0.5, Math.abs(0.5)); assertEquals(0.1, Math.abs(-0.1)); assertEquals(0.5, Math.abs(-0.5)); assertEquals(1, Math.abs(1)); assertEquals(1.1, Math.abs(1.1)); assertEquals(1.5, Math.abs(1.5)); assertEquals(1, Math.abs(-1)); assertEquals(1.1, Math.abs(-1.1)); assertEquals(1.5, Math.abs(-1.5)); assertEquals(Number.MIN_VALUE, Math.abs(Number.MIN_VALUE)); assertEquals(Number.MIN_VALUE, Math.abs(-Number.MIN_VALUE)); assertEquals(Number.MAX_VALUE, Math.abs(Number.MAX_VALUE)); assertEquals(Number.MAX_VALUE, Math.abs(-Number.MAX_VALUE)); // 2^30 is a smi boundary on arm and ia32. var two_30 = 1 << 30; assertEquals(two_30, Math.abs(two_30)); assertEquals(two_30, Math.abs(-two_30)); assertEquals(two_30 + 1, Math.abs(two_30 + 1)); assertEquals(two_30 + 1, Math.abs(-two_30 - 1)); assertEquals(two_30 - 1, Math.abs(two_30 - 1)); assertEquals(two_30 - 1, Math.abs(-two_30 + 1)); // 2^31 is a smi boundary on x64. var two_31 = 2 * two_30; assertEquals(two_31, Math.abs(two_31)); assertEquals(two_31, Math.abs(-two_31)); assertEquals(two_31 + 1, Math.abs(two_31 + 1)); assertEquals(two_31 + 1, Math.abs(-two_31 - 1)); assertEquals(two_31 - 1, Math.abs(two_31 - 1)); assertEquals(two_31 - 1, Math.abs(-two_31 + 1)); assertEquals(NaN, Math.abs("not a number")); assertEquals(NaN, Math.abs([1, 2, 3])); assertEquals(42, Math.abs({valueOf: function() { return 42; } })); assertEquals(42, Math.abs({valueOf: function() { return -42; } })); } // Test in a loop to cover the custom IC and GC-related issues. for (var i = 0; i < 500; i++) { test(); } // Regression test for optimized version of Math.abs, see: // http://codereview.chromium.org/6875002. function foo(x) { return Math.abs(x); } // Get some smi type feedback. for(var i = 0; i < 1000; i++) { foo(-i); } assertEquals(42, foo(-42)); %OptimizeFunctionOnNextCall(foo) assertEquals(42, foo(-42));