1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
// 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 --store-elimination
// Test local elimination of unobservable stores.
function B(x, y) {
this.x = x;
this.y = y;
return this;
}
function test_store_store() {
var a = new B(1, 2);
a.x = 3; // eliminatable.
a.x = 4;
return a.x;
}
function test_store_load_store1() {
var a = new B(6, 7);
a.x = 3; // eliminatable.
var r = a.y;
a.x = 4;
return r;
}
function test_store_load_store2() {
var a = new B(6, 8);
a.x = 3; // not eliminatable, unless next load is eliminated.
var r = a.x;
a.x = 4;
return r;
}
function test_store_call_store() {
var a = new B(2, 9);
a.x = 3; // not eliminatable.
killall();
a.x = 4;
return a.y;
}
function test_store_deopt_store() {
var a = new B(2, 1);
a.x = 3; // not eliminatable (implicit ValueOf following)
var c = a + 2;
a.x = 4;
return a.y;
}
function killall() {
try { } catch(e) { }
}
%NeverOptimizeFunction(killall);
function test(x, f) {
assertEquals(x, f());
assertEquals(x, f());
%OptimizeFunctionOnNextCall(f);
assertEquals(x, f());
}
test(4, test_store_store);
test(7, test_store_load_store1);
test(3, test_store_load_store2);
test(9, test_store_call_store);
test(1, test_store_deopt_store);
|
