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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
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     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 
     31 // Test that both kinds of NaNs (signaling or quiet) do not signal
     32 
     33 function TestAllModes(f) {
     34   f(); // Runtime
     35   f(); // IC
     36   f(); // IC second time
     37   %OptimizeFunctionOnNextCall(f);
     38   f(); // hydrogen
     39 }
     40 
     41 function TestDoubleSignalingNan() {
     42   // NaN with signal bit set
     43   function f() {
     44     var bytes = new Uint32Array([1, 0x7FF00000]);
     45     var doubles = new Float64Array(bytes.buffer);
     46     assertTrue(isNaN(doubles[0]));
     47     assertTrue(isNaN(doubles[0]*2.0));
     48     assertTrue(isNaN(doubles[0] + 0.5));
     49   }
     50 
     51   TestAllModes(f);
     52 }
     53 
     54 TestDoubleSignalingNan();
     55 
     56 function TestDoubleQuietNan() {
     57   // NaN with signal bit cleared
     58   function f() {
     59     var bytes = new Uint32Array([0, 0x7FF80000]);
     60     var doubles = new Float64Array(bytes.buffer);
     61     assertTrue(isNaN(doubles[0]));
     62     assertTrue(isNaN(doubles[0]*2.0));
     63     assertTrue(isNaN(doubles[0] + 0.5));
     64   }
     65 
     66   TestAllModes(f);
     67 }
     68 
     69 TestDoubleQuietNan();
     70 
     71 function TestFloatSignalingNan() {
     72   // NaN with signal bit set
     73   function f() {
     74     var bytes = new Uint32Array([0x7F800001]);
     75     var floats = new Float32Array(bytes.buffer);
     76     assertTrue(isNaN(floats[0]));
     77     assertTrue(isNaN(floats[0]*2.0));
     78     assertTrue(isNaN(floats[0] + 0.5));
     79   }
     80 
     81   TestAllModes(f);
     82 }
     83 
     84 TestFloatSignalingNan();
     85 
     86 function TestFloatQuietNan() {
     87   // NaN with signal bit cleared
     88   function f() {
     89     var bytes = new Uint32Array([0x7FC00000]);
     90     var floats = new Float32Array(bytes.buffer);
     91     assertTrue(isNaN(floats[0]));
     92     assertTrue(isNaN(floats[0]*2.0));
     93     assertTrue(isNaN(floats[0] + 0.5));
     94   }
     95 
     96   TestAllModes(f);
     97 }
     98 
     99 TestFloatQuietNan();
    100