mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
/*
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* Copyright (C) 2014, 2016 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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#pragma once
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#if ENABLE(FTL_JIT)
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#include "FTLAbbreviatedTypes.h"
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#include "FTLWeight.h"
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namespace JSC { namespace FTL {
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class WeightedTarget {
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public:
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WeightedTarget()
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: m_target(nullptr)
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{
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}
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WeightedTarget(LBasicBlock target, Weight weight)
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: m_target(target)
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, m_weight(weight)
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{
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}
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WeightedTarget(LBasicBlock target, float weight)
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: m_target(target)
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, m_weight(weight)
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{
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}
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LBasicBlock target() const { return m_target; }
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Weight weight() const { return m_weight; }
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B3::FrequentedBlock frequentedBlock() const
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{
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return B3::FrequentedBlock(target(), weight().frequencyClass());
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}
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private:
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LBasicBlock m_target;
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Weight m_weight;
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};
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// Helpers for creating weighted targets for statically known (or unknown) branch
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// profiles.
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inline WeightedTarget usually(LBasicBlock block)
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{
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return WeightedTarget(block, 1);
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}
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inline WeightedTarget rarely(LBasicBlock block)
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{
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return WeightedTarget(block, 0);
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}
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// Currently in B3 this is the equivalent of "usually", but we like to make the distinction in
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// case we ever make B3 support proper branch weights. We used to do that in LLVM.
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inline WeightedTarget unsure(LBasicBlock block)
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{
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return WeightedTarget(block, Weight());
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}
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} } // namespace JSC::FTL
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#endif // ENABLE(FTL_JIT)
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