1// Copyright 2013 the V8 project authors. All rights reserved.
2// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
3//
4// Redistribution and use in source and binary forms, with or without
5// modification, are permitted provided that the following conditions
6// are met:
7// 1.  Redistributions of source code must retain the above copyright
8//     notice, this list of conditions and the following disclaimer.
9// 2.  Redistributions in binary form must reproduce the above copyright
10//     notice, this list of conditions and the following disclaimer in the
11//     documentation and/or other materials provided with the distribution.
12//
13// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
14// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16// DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23
24description(
25"This tests that integer addition optimizations in the DFG are not performed too overzealously."
26);
27
28function doAdd(a,b) {
29    // The point of this test is to see if the DFG CSE's the second (a + b) against the first, after
30    // optimizing the first to be an integer addition. The first one certainly is an integer addition,
31    // but the second one isn't - it must either be an integer addition with overflow checking, or a
32    // double addition.
33    return {a:((a + b) | 0), b:(a + b)};
34}
35
36for (var i = 0; i < 1000; ++i) {
37    // Create numbers big enough that we'll start seeing doubles only after about 200 invocations.
38    var a = i * 1000 * 1000 * 10;
39    var b = i * 1000 * 1000 * 10 + 1;
40    var result = doAdd(a, b);
41
42    // Use eval() for computing the correct result, to force execution to happen outside the DFG.
43    shouldBe("result.a", "" + eval("((" + a + " + " + b + ") | 0)"))
44    shouldBe("result.b", "" + eval(a + " + " + b))
45}
46