mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-07 09:21:41 +00:00
125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
/*
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* Copyright (C) 2016-2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "B3PureCSE.h"
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#if ENABLE(B3_JIT)
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#include "B3Dominators.h"
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#include "B3PhaseScope.h"
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#include "B3Value.h"
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#include "B3ValueInlines.h"
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namespace JSC { namespace B3 {
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PureCSE::PureCSE()
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{
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}
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PureCSE::~PureCSE()
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{
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}
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void PureCSE::clear()
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{
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m_map.clear();
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}
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Value* PureCSE::findMatch(const ValueKey& key, BasicBlock* block, Dominators& dominators)
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{
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if (!key)
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return nullptr;
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auto iter = m_map.find(key);
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if (iter == m_map.end())
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return nullptr;
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for (Value* match : iter->value) {
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// Value is invalidated.
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if (!match->owner)
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continue;
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// Value is moved to a new BasicBlock which is not inserted yet.
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// In that case, we should just ignore it. PureCSE will be recomputed after new BasicBlocks are actually inserted.
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if (!match->owner->isInserted())
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continue;
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if (dominators.dominates(match->owner, block))
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return match;
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}
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return nullptr;
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}
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bool PureCSE::process(Value* value, Dominators& dominators)
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{
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if (value->opcode() == Identity || value->isConstant())
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return false;
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ValueKey key = value->key();
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if (!key)
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return false;
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Matches& matches = m_map.add(key, Matches()).iterator->value;
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for (Value* match : matches) {
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// Value is invalidated.
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if (!match->owner)
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continue;
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// Value is moved to a new BasicBlock which is not inserted yet.
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// In that case, we should just ignore it. PureCSE will be recomputed after new BasicBlocks are actually inserted.
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if (!match->owner->isInserted())
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continue;
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if (dominators.dominates(match->owner, value->owner)) {
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value->replaceWithIdentity(match);
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return true;
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}
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}
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matches.append(value);
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return false;
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}
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bool pureCSE(Procedure& proc)
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{
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PhaseScope phaseScope(proc, "pureCSE");
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Dominators& dominators = proc.dominators();
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PureCSE pureCSE;
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bool result = false;
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for (BasicBlock* block : proc.blocksInPreOrder()) {
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for (Value* value : *block) {
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result |= value->performSubstitution();
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result |= pureCSE.process(value, dominators);
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}
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}
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return result;
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}
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} } // namespace JSC::B3
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#endif // ENABLE(B3_JIT)
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