projects / apple / javascriptcore.git / blame
| Commit | Line | Data |
|---|---|---|
| f9bf01c6 | 1 | /* |
| 81345200 | 2 | * Copyright (C) 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 | ||
| 81345200 A |
26 | #ifndef DFGStaticExecutionCountEstimationPhase_h |
| 27 | #define DFGStaticExecutionCountEstimationPhase_h | |
| f9bf01c6 | 28 | |
| 81345200 | 29 | #if ENABLE(DFG_JIT) |
| f9bf01c6 | 30 | |
| 81345200 | 31 | namespace JSC { namespace DFG { |
| f9bf01c6 | 32 | |
| 81345200 | 33 | class Graph; |
| f9bf01c6 | 34 | |
| 81345200 A |
35 | // Estimate execution counts (branch execution counts, in particular) based on |
| 36 | // presently available static information. This phase is important because | |
| 37 | // subsequent CFG transformations, such as OSR entrypoint creation, perturb our | |
| 38 | // ability to do accurate static estimations. Hence we lock in the estimates early. | |
| 39 | // Ideally, we would have dynamic information, but we don't right now, so this is as | |
| 40 | // good as it gets. | |
| 41 | // | |
| 42 | // It's worth noting that if we didn't have this phase, then the static estimation | |
| 43 | // would be perfomed by LLVM instead. It's worth trying to make this phase perform | |
| 44 | // the estimates using the same heuristics that LLVM would use. | |
| 93a37866 | 45 | |
| 81345200 | 46 | bool performStaticExecutionCountEstimation(Graph&); |
| f9bf01c6 | 47 | |
| 81345200 | 48 | } } // namespace JSC::DFG |
| f9bf01c6 | 49 | |
| 81345200 A |
50 | #endif // ENABLE(DFG_JIT) |
| 51 | ||
| 52 | #endif // DFGStaticExecutionCountEstimationPhase_h | |
| 93a37866 | 53 |