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// Copyright 2013 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: --allow-natives-syntax
// Helper to determine endian - returns true on little endian platforms
function isLittleEndian() {
return ((new Uint32Array((new Uint8Array([4,3,2,1])).buffer))[0])
== 0x01020304;
}
// Test that both kinds of NaNs (signaling or quiet) do not signal
function TestAllModes(f) {
f(); // Runtime
f(); // IC
f(); // IC second time
%OptimizeFunctionOnNextCall(f);
f(); // hydrogen
}
function TestDoubleSignalingNan() {
// NaN with signal bit set
function f() {
if(isLittleEndian()) {
var bytes = new Uint32Array([1, 0x7FF00000]);
} else {
var bytes = new Uint32Array([0x7FF00000, 1]);
}
var doubles = new Float64Array(bytes.buffer);
assertTrue(isNaN(doubles[0]));
assertTrue(isNaN(doubles[0]*2.0));
assertTrue(isNaN(doubles[0] + 0.5));
}
TestAllModes(f);
}
TestDoubleSignalingNan();
function TestDoubleQuietNan() {
// NaN with signal bit cleared
function f() {
if(isLittleEndian()) {
var bytes = new Uint32Array([0, 0x7FF80000]);
} else {
var bytes = new Uint32Array([0x7FF80000, 0]);
}
var doubles = new Float64Array(bytes.buffer);
assertTrue(isNaN(doubles[0]));
assertTrue(isNaN(doubles[0]*2.0));
assertTrue(isNaN(doubles[0] + 0.5));
}
TestAllModes(f);
}
TestDoubleQuietNan();
function TestFloatSignalingNan() {
// NaN with signal bit set
function f() {
var bytes = new Uint32Array([0x7F800001]);
var floats = new Float32Array(bytes.buffer);
assertTrue(isNaN(floats[0]));
assertTrue(isNaN(floats[0]*2.0));
assertTrue(isNaN(floats[0] + 0.5));
}
TestAllModes(f);
}
TestFloatSignalingNan();
function TestFloatQuietNan() {
// NaN with signal bit cleared
function f() {
var bytes = new Uint32Array([0x7FC00000]);
var floats = new Float32Array(bytes.buffer);
assertTrue(isNaN(floats[0]));
assertTrue(isNaN(floats[0]*2.0));
assertTrue(isNaN(floats[0] + 0.5));
}
TestAllModes(f);
}
TestFloatQuietNan();
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