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1 // Copyright 2008 the V8 project authors. All rights reserved. | 1 // Copyright 2013 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
11 // with the distribution. | 11 // with the distribution. |
12 // * Neither the name of Google Inc. nor the names of its | 12 // * Neither the name of Google Inc. nor the names of its |
13 // contributors may be used to endorse or promote products derived | 13 // contributors may be used to endorse or promote products derived |
14 // from this software without specific prior written permission. | 14 // from this software without specific prior written permission. |
15 // | 15 // |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | 27 |
28 // Flags: --allow-natives-syntax | 28 // Flags: --allow-natives-syntax |
29 // Test some dead code elimination scenarios | |
30 | 29 |
31 function dead1(x, y) { | 30 function dead1(a, b) { |
32 var a = x | 0, b = y | 0; | 31 var x = %_StringCharFromCode(a); |
33 a * b; | 32 return a; // x is dead code |
34 a << b; | |
35 a >> b; | |
36 a >>> b; | |
37 a | b; | |
38 a & b; | |
39 a ^ b; | |
40 return x; | |
41 } | 33 } |
42 | 34 |
43 function dead2(x, y) { | 35 function dead2(a, b) { |
44 var a = x | 0, b = y | 0; | 36 var x = %_StringCharFromCode(a); |
45 (a | 0) * b; | 37 var y = %_StringCharFromCode(b); |
46 (a | 0) << b; | 38 return a; // x and y are both dead |
47 (a | 0) >> b; | |
48 (a | 0) >>> b; | |
49 (a | 0) | b; | |
50 (a | 0) & b; | |
51 (a | 0) ^ b; | |
52 return x; | |
53 } | 39 } |
54 | 40 |
55 function dead3(a, b) { | 41 function dead3(a, b) { |
56 a == 2 ? (a * b) : (b * a); // dead | 42 a = a ? 11 : 12; |
57 return a; | 43 b = b ? 13 : 14; |
| 44 var x = %_StringCharFromCode(a); |
| 45 var y = %_StringCharFromCode(b); |
| 46 return a; // x and y are both dead |
58 } | 47 } |
59 | 48 |
60 assertTrue(dead1(33, 32) == 33); | 49 function test() { |
61 assertTrue(dead1(33, 32) == 33); | 50 assertTrue(dead1(33, 32) == 33); |
| 51 assertTrue(dead2(33, 32) == 33); |
| 52 assertTrue(dead3(33, 32) == 11); |
| 53 |
| 54 assertTrue(dead1(31, 30) == 31); |
| 55 assertTrue(dead2(31, 30) == 31); |
| 56 assertTrue(dead3(31, 32) == 11); |
| 57 |
| 58 assertTrue(dead1(0, 30) == 0); |
| 59 assertTrue(dead2(0, 30) == 0); |
| 60 assertTrue(dead3(0, 32) == 12); |
| 61 |
| 62 assertTrue(dead1(true, 0) == true); |
| 63 assertTrue(dead2(true, 0) == true); |
| 64 assertTrue(dead3(true, 0) == 11); |
| 65 |
| 66 assertTrue(dead1("true", 0) == "true"); |
| 67 assertTrue(dead2("true", 0) == "true"); |
| 68 assertTrue(dead3("true", 0) == 11); |
| 69 } |
| 70 |
| 71 test(); |
| 72 test(); |
62 %OptimizeFunctionOnNextCall(dead1); | 73 %OptimizeFunctionOnNextCall(dead1); |
63 assertTrue(dead1(33, 32) == 33); | |
64 | |
65 assertTrue(dead2(34, 11) == 34); | |
66 assertTrue(dead2(34, 11) == 34); | |
67 %OptimizeFunctionOnNextCall(dead2); | 74 %OptimizeFunctionOnNextCall(dead2); |
68 assertTrue(dead2(34, 11) == 34); | |
69 | |
70 assertTrue(dead3(35, 12) == 35); | |
71 assertTrue(dead3(35, 12) == 35); | |
72 %OptimizeFunctionOnNextCall(dead3); | 75 %OptimizeFunctionOnNextCall(dead3); |
73 assertTrue(dead3(35, 12) == 35); | 76 test(); |
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