Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 1 | // Copyright 2008 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
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| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 28 | // Flags: --allow-natives-syntax |
| 29 | // Test some dead code elimination scenarios |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 30 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 31 | function dead1(x, y) { |
| 32 | var a = x | 0, b = y | 0; |
| 33 | a * b; |
| 34 | a << b; |
| 35 | a >> b; |
| 36 | a >>> b; |
| 37 | a | b; |
| 38 | a & b; |
| 39 | a ^ b; |
| 40 | return x; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 41 | } |
| 42 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 43 | function dead2(x, y) { |
| 44 | var a = x | 0, b = y | 0; |
| 45 | (a | 0) * b; |
| 46 | (a | 0) << b; |
| 47 | (a | 0) >> b; |
| 48 | (a | 0) >>> b; |
| 49 | (a | 0) | b; |
| 50 | (a | 0) & b; |
| 51 | (a | 0) ^ b; |
| 52 | return x; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 53 | } |
| 54 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 55 | function dead3(a, b) { |
| 56 | a == 2 ? (a * b) : (b * a); // dead |
| 57 | return a; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 58 | } |
| 59 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 60 | assertTrue(dead1(33, 32) == 33); |
| 61 | assertTrue(dead1(33, 32) == 33); |
| 62 | %OptimizeFunctionOnNextCall(dead1); |
| 63 | assertTrue(dead1(33, 32) == 33); |
| 64 | |
| 65 | assertTrue(dead2(34, 11) == 34); |
| 66 | assertTrue(dead2(34, 11) == 34); |
| 67 | %OptimizeFunctionOnNextCall(dead2); |
| 68 | assertTrue(dead2(34, 11) == 34); |
| 69 | |
| 70 | assertTrue(dead3(35, 12) == 35); |
| 71 | assertTrue(dead3(35, 12) == 35); |
| 72 | %OptimizeFunctionOnNextCall(dead3); |
| 73 | assertTrue(dead3(35, 12) == 35); |