projects / apple / javascriptcore.git / blame
| Commit | Line | Data |
|---|---|---|
| f9bf01c6 | 1 | /* |
| ed1e77d3 | 2 | * Copyright (C) 2011, 2014 Apple Inc. All rights reserved. |
| f9bf01c6 A |
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. ``AS IS'' AND ANY | |
| 14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR | |
| 17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 | */ | |
| 25 | ||
| 6fe7ccc8 A |
26 | #ifndef DFGCSEPhase_h |
| 27 | #define DFGCSEPhase_h | |
| f9bf01c6 | 28 | |
| 6fe7ccc8 | 29 | #if ENABLE(DFG_JIT) |
| f9bf01c6 | 30 | |
| 93a37866 A |
31 | #include "DFGCommon.h" |
| 32 | ||
| 6fe7ccc8 | 33 | namespace JSC { namespace DFG { |
| f9bf01c6 | 34 | |
| 6fe7ccc8 | 35 | class Graph; |
| f9bf01c6 | 36 | |
| ed1e77d3 A |
37 | // Block-local common subexpression elimination. It uses clobberize() for heap |
| 38 | // modeling, which is quite precise. This phase is known to produce big wins on | |
| 39 | // a few benchmarks, and is relatively cheap to run. | |
| 40 | // | |
| 41 | // Note that this phase also gets rid of Identity nodes, which means that it's | |
| 42 | // currently not an optional phase. Basically, DFG IR doesn't have use-lists, | |
| 43 | // so there is no instantaneous replaceAllUsesWith operation. Instead, you turn | |
| 44 | // a node into an Identity and wait for CSE to clean it up. | |
| 45 | bool performLocalCSE(Graph&); | |
| 46 | ||
| 47 | // Same, but global. Only works for SSA. This will find common subexpressions | |
| 48 | // both in the same block and in any block that dominates the current block. It | |
| 49 | // has no limits on how far it will look for load-elimination opportunities. | |
| 50 | bool performGlobalCSE(Graph&); | |
| 14957cd0 | 51 | |
| 6fe7ccc8 | 52 | } } // namespace JSC::DFG |
| f9bf01c6 | 53 | |
| 6fe7ccc8 | 54 | #endif // ENABLE(DFG_JIT) |
| f9bf01c6 | 55 | |
| 6fe7ccc8 | 56 | #endif // DFGCSEPhase_h |
| 14957cd0 | 57 |