Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 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 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 30 | // Helper to determine endian - returns true on little endian platforms |
| 31 | function isLittleEndian() { |
| 32 | return ((new Uint32Array((new Uint8Array([4,3,2,1])).buffer))[0]) |
| 33 | == 0x01020304; |
| 34 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 35 | |
| 36 | // Test that both kinds of NaNs (signaling or quiet) do not signal |
| 37 | |
| 38 | function TestAllModes(f) { |
| 39 | f(); // Runtime |
| 40 | f(); // IC |
| 41 | f(); // IC second time |
| 42 | %OptimizeFunctionOnNextCall(f); |
| 43 | f(); // hydrogen |
| 44 | } |
| 45 | |
| 46 | function TestDoubleSignalingNan() { |
| 47 | // NaN with signal bit set |
| 48 | function f() { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 49 | if(isLittleEndian()) { |
| 50 | var bytes = new Uint32Array([1, 0x7FF00000]); |
| 51 | } else { |
| 52 | var bytes = new Uint32Array([0x7FF00000, 1]); |
| 53 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 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 | |
| 63 | TestDoubleSignalingNan(); |
| 64 | |
| 65 | function TestDoubleQuietNan() { |
| 66 | // NaN with signal bit cleared |
| 67 | function f() { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 68 | if(isLittleEndian()) { |
| 69 | var bytes = new Uint32Array([0, 0x7FF80000]); |
| 70 | } else { |
| 71 | var bytes = new Uint32Array([0x7FF80000, 0]); |
| 72 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 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 | |
| 82 | TestDoubleQuietNan(); |
| 83 | |
| 84 | function 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 | |
| 97 | TestFloatSignalingNan(); |
| 98 | |
| 99 | function 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 | |
| 112 | TestFloatQuietNan(); |