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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