mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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85 lines
3.0 KiB
C++
85 lines
3.0 KiB
C++
/*
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* Copyright (C) 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 "B3EnsureLoopPreHeaders.h"
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#if ENABLE(B3_JIT)
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#include "B3BasicBlockInlines.h"
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#include "B3BlockInsertionSet.h"
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#include "B3NaturalLoops.h"
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#include "B3ValueInlines.h"
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namespace JSC { namespace B3 {
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bool ensureLoopPreHeaders(Procedure& proc)
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{
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NaturalLoops& loops = proc.naturalLoops();
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BlockInsertionSet insertionSet(proc);
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for (unsigned loopIndex = loops.numLoops(); loopIndex--;) {
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const NaturalLoop& loop = loops.loop(loopIndex);
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Vector<BasicBlock*, 4> outOfBodyPredecessors;
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double totalFrequency = 0;
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for (BasicBlock* predecessor : loop.header()->predecessors()) {
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if (loops.belongsTo(predecessor, loop))
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continue;
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outOfBodyPredecessors.append(predecessor);
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totalFrequency += predecessor->frequency();
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}
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if (outOfBodyPredecessors.size() <= 1)
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continue;
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BasicBlock* preHeader = insertionSet.insertBefore(loop.header(), totalFrequency);
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preHeader->appendNew<Value>(proc, Jump, loop.header()->at(0)->origin());
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preHeader->setSuccessors(FrequentedBlock(loop.header()));
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for (BasicBlock* predecessor : outOfBodyPredecessors) {
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predecessor->replaceSuccessor(loop.header(), preHeader);
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preHeader->addPredecessor(predecessor);
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loop.header()->removePredecessor(predecessor);
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}
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loop.header()->addPredecessor(preHeader);
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}
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if (insertionSet.execute()) {
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proc.invalidateCFG();
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return true;
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}
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return false;
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}
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} } // namespace JSC::B3
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#endif // ENABLE(B3_JIT)
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