mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
54 lines
2.3 KiB
C++
54 lines
2.3 KiB
C++
/*
|
|
* Copyright (C) 2011, 2014 Apple Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#if ENABLE(DFG_JIT)
|
|
|
|
#include "DFGCommon.h"
|
|
|
|
namespace JSC { namespace DFG {
|
|
|
|
class Graph;
|
|
|
|
// Block-local common subexpression elimination. It uses clobberize() for heap
|
|
// modeling, which is quite precise. This phase is known to produce big wins on
|
|
// a few benchmarks, and is relatively cheap to run.
|
|
//
|
|
// Note that this phase also gets rid of Identity nodes, which means that it's
|
|
// currently not an optional phase. Basically, DFG IR doesn't have use-lists,
|
|
// so there is no instantaneous replaceAllUsesWith operation. Instead, you turn
|
|
// a node into an Identity and wait for CSE to clean it up.
|
|
bool performLocalCSE(Graph&);
|
|
|
|
// Same, but global. Only works for SSA. This will find common subexpressions
|
|
// both in the same block and in any block that dominates the current block. It
|
|
// has no limits on how far it will look for load-elimination opportunities.
|
|
bool performGlobalCSE(Graph&);
|
|
|
|
} } // namespace JSC::DFG
|
|
|
|
#endif // ENABLE(DFG_JIT)
|