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DFGCSEPhase.h
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53 lines (44 loc) · 2.25 KB
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/*
* 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)