59 lines
2 KiB
C++
59 lines
2 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_COMPILER_OPTIMIZING_NODES_ARM_H_
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#define ART_COMPILER_OPTIMIZING_NODES_ARM_H_
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namespace art {
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class HArmDexCacheArraysBase : public HExpression<0> {
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public:
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explicit HArmDexCacheArraysBase(const DexFile& dex_file)
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: HExpression(Primitive::kPrimInt, SideEffects::None(), kNoDexPc),
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dex_file_(&dex_file),
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element_offset_(static_cast<size_t>(-1)) { }
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void UpdateElementOffset(size_t element_offset) {
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// Use the lowest offset from the requested elements so that all offsets from
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// this base are non-negative because our assemblers emit negative-offset loads
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// as a sequence of two or more instructions. (However, positive offsets beyond
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// 4KiB also require two or more instructions, so this simple heuristic could
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// be improved for cases where there is a dense cluster of elements far from
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// the lowest offset. This is expected to be rare enough though, so we choose
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// not to spend compile time on elaborate calculations.)
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element_offset_ = std::min(element_offset_, element_offset);
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}
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const DexFile& GetDexFile() const {
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return *dex_file_;
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}
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size_t GetElementOffset() const {
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return element_offset_;
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}
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DECLARE_INSTRUCTION(ArmDexCacheArraysBase);
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private:
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const DexFile* dex_file_;
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size_t element_offset_;
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DISALLOW_COPY_AND_ASSIGN(HArmDexCacheArraysBase);
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};
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} // namespace art
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#endif // ART_COMPILER_OPTIMIZING_NODES_ARM_H_
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