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45 lines
2.3 KiB
45 lines
2.3 KiB
// Copyright 2013 the V8 project authors. All rights reserved.
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// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
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//
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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
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// are met:
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// 1. 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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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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// ANY 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 OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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description(
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"This tests that integer addition optimizations in the DFG are not performed too overzealously."
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);
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function doAdd(a,b) {
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// The point of this test is to see if the DFG CSE's the second (a + b) against the first, after
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// optimizing the first to be an integer addition. The first one certainly is an integer addition,
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// but the second one isn't - it must either be an integer addition with overflow checking, or a
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// double addition.
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return {a:((a + b) | 0), b:(a + b)};
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}
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for (var i = 0; i < 1000; ++i) {
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// Create numbers big enough that we'll start seeing doubles only after about 200 invocations.
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var a = i * 1000 * 1000 * 10;
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var b = i * 1000 * 1000 * 10 + 1;
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var result = doAdd(a, b);
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// Use eval() for computing the correct result, to force execution to happen outside the DFG.
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shouldBe("result.a", "" + eval("((" + a + " + " + b + ") | 0)"))
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shouldBe("result.b", "" + eval(a + " + " + b))
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}
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