7709e41aec
Previously ChangeLowering would always box float64 values when going to tagged representation, but that introduces a lot of deoptimizer loops and polymorphism into TurboFan, which is unfortunate and unnecessary. This adds some logic to ChangeFloat64ToTagged to try harder to create a Smi when going from Float64 to Tagged, instead of always allocating a HeapNumber. This might need some additional tweaking, but at least it makes it possible to start comparing TurboFan and Crankshaft for some regular JavaScript. R=jarin@chromium.org Review URL: https://codereview.chromium.org/1420913003 Cr-Commit-Position: refs/heads/master@{#31609}
49 lines
2.0 KiB
JavaScript
49 lines
2.0 KiB
JavaScript
// Copyright 2011 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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function get_double_array() {
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var a = new Array(100000);
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var i = 0;
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while (!%HasFastDoubleElements(a)) {
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a[i] = i + 0.1;
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i += 1;
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}
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assertTrue(%HasFastDoubleElements(a));
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a.length = 1;
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a[0] = 1.5;
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a.length = 2;
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a[1] = 2.5;
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assertEquals(a[0], 1.5);
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assertEquals(a[1], 2.5);
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assertTrue(%HasFastDoubleElements(a));
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return a;
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}
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var a = get_double_array();
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