ab99a74ce8
Bug=v8:8801,v8:8394,v8:9183 Change-Id: I5bd3505938a49dab0299f1d1d022e8a31cc806c5 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1660479 Commit-Queue: Ross McIlroy <rmcilroy@chromium.org> Commit-Queue: Mythri Alle <mythria@chromium.org> Auto-Submit: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Mythri Alle <mythria@chromium.org> Cr-Commit-Position: refs/heads/master@{#62178}
114 lines
3.6 KiB
JavaScript
114 lines
3.6 KiB
JavaScript
// Copyright 2013 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --allow-natives-syntax
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// Helper to determine endian - returns true on little endian platforms
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function isLittleEndian() {
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return ((new Uint32Array((new Uint8Array([4,3,2,1])).buffer))[0])
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== 0x01020304;
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}
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// Test that both kinds of NaNs (signaling or quiet) do not signal
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function TestAllModes(f) {
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%PrepareFunctionForOptimization(f);
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f(); // Runtime
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f(); // IC
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f(); // IC second time
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%OptimizeFunctionOnNextCall(f);
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f(); // hydrogen
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}
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function TestDoubleSignalingNan() {
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// NaN with signal bit set
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function f() {
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if(isLittleEndian()) {
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var bytes = new Uint32Array([1, 0x7FF00000]);
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} else {
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var bytes = new Uint32Array([0x7FF00000, 1]);
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}
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var doubles = new Float64Array(bytes.buffer);
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assertTrue(isNaN(doubles[0]));
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assertTrue(isNaN(doubles[0]*2.0));
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assertTrue(isNaN(doubles[0] + 0.5));
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}
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TestAllModes(f);
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}
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TestDoubleSignalingNan();
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function TestDoubleQuietNan() {
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// NaN with signal bit cleared
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function f() {
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if(isLittleEndian()) {
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var bytes = new Uint32Array([0, 0x7FF80000]);
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} else {
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var bytes = new Uint32Array([0x7FF80000, 0]);
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}
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var doubles = new Float64Array(bytes.buffer);
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assertTrue(isNaN(doubles[0]));
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assertTrue(isNaN(doubles[0]*2.0));
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assertTrue(isNaN(doubles[0] + 0.5));
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}
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TestAllModes(f);
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}
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TestDoubleQuietNan();
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function TestFloatSignalingNan() {
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// NaN with signal bit set
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function f() {
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var bytes = new Uint32Array([0x7F800001]);
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var floats = new Float32Array(bytes.buffer);
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assertTrue(isNaN(floats[0]));
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assertTrue(isNaN(floats[0]*2.0));
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assertTrue(isNaN(floats[0] + 0.5));
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}
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TestAllModes(f);
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}
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TestFloatSignalingNan();
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function TestFloatQuietNan() {
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// NaN with signal bit cleared
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function f() {
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var bytes = new Uint32Array([0x7FC00000]);
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var floats = new Float32Array(bytes.buffer);
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assertTrue(isNaN(floats[0]));
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assertTrue(isNaN(floats[0]*2.0));
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assertTrue(isNaN(floats[0] + 0.5));
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}
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TestAllModes(f);
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}
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TestFloatQuietNan();
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