1// Copyright 2013 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28// Flags: --allow-natives-syntax 29 30// Helper to determine endian - returns true on little endian platforms 31function isLittleEndian() { 32 return ((new Uint32Array((new Uint8Array([4,3,2,1])).buffer))[0]) 33 == 0x01020304; 34} 35 36// Test that both kinds of NaNs (signaling or quiet) do not signal 37 38function TestAllModes(f) { 39 f(); // Runtime 40 f(); // IC 41 f(); // IC second time 42 %OptimizeFunctionOnNextCall(f); 43 f(); // hydrogen 44} 45 46function TestDoubleSignalingNan() { 47 // NaN with signal bit set 48 function f() { 49 if(isLittleEndian()) { 50 var bytes = new Uint32Array([1, 0x7FF00000]); 51 } else { 52 var bytes = new Uint32Array([0x7FF00000, 1]); 53 } 54 var doubles = new Float64Array(bytes.buffer); 55 assertTrue(isNaN(doubles[0])); 56 assertTrue(isNaN(doubles[0]*2.0)); 57 assertTrue(isNaN(doubles[0] + 0.5)); 58 } 59 60 TestAllModes(f); 61} 62 63TestDoubleSignalingNan(); 64 65function TestDoubleQuietNan() { 66 // NaN with signal bit cleared 67 function f() { 68 if(isLittleEndian()) { 69 var bytes = new Uint32Array([0, 0x7FF80000]); 70 } else { 71 var bytes = new Uint32Array([0x7FF80000, 0]); 72 } 73 var doubles = new Float64Array(bytes.buffer); 74 assertTrue(isNaN(doubles[0])); 75 assertTrue(isNaN(doubles[0]*2.0)); 76 assertTrue(isNaN(doubles[0] + 0.5)); 77 } 78 79 TestAllModes(f); 80} 81 82TestDoubleQuietNan(); 83 84function TestFloatSignalingNan() { 85 // NaN with signal bit set 86 function f() { 87 var bytes = new Uint32Array([0x7F800001]); 88 var floats = new Float32Array(bytes.buffer); 89 assertTrue(isNaN(floats[0])); 90 assertTrue(isNaN(floats[0]*2.0)); 91 assertTrue(isNaN(floats[0] + 0.5)); 92 } 93 94 TestAllModes(f); 95} 96 97TestFloatSignalingNan(); 98 99function TestFloatQuietNan() { 100 // NaN with signal bit cleared 101 function f() { 102 var bytes = new Uint32Array([0x7FC00000]); 103 var floats = new Float32Array(bytes.buffer); 104 assertTrue(isNaN(floats[0])); 105 assertTrue(isNaN(floats[0]*2.0)); 106 assertTrue(isNaN(floats[0] + 0.5)); 107 } 108 109 TestAllModes(f); 110} 111 112TestFloatQuietNan(); 113