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https://github.com/KhronosGroup/SPIRV-Tools
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74 lines
2.7 KiB
C++
74 lines
2.7 KiB
C++
// Copyright (c) 2018 Google LLC
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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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#ifndef SOURCE_OPT_REDUCE_LOAD_SIZE_H_
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#define SOURCE_OPT_REDUCE_LOAD_SIZE_H_
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#include <unordered_map>
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#include "source/opt/ir_context.h"
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#include "source/opt/module.h"
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#include "source/opt/pass.h"
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namespace spvtools {
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namespace opt {
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// See optimizer.hpp for documentation.
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class ReduceLoadSize : public Pass {
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public:
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explicit ReduceLoadSize(double replacement_threshold)
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: replacement_threshold_(replacement_threshold) {}
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const char* name() const override { return "reduce-load-size"; }
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Status Process() override;
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// Return the mask of preserved Analyses.
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IRContext::Analysis GetPreservedAnalyses() override {
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return IRContext::kAnalysisDefUse |
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IRContext::kAnalysisInstrToBlockMapping |
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IRContext::kAnalysisCombinators | IRContext::kAnalysisCFG |
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IRContext::kAnalysisDominatorAnalysis |
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IRContext::kAnalysisLoopAnalysis | IRContext::kAnalysisNameMap |
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IRContext::kAnalysisConstants | IRContext::kAnalysisTypes;
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}
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private:
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// Replaces |inst|, which must be an OpCompositeExtract instruction, with
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// an OpAccessChain and a load if possible. This happens only if it is a load
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// feeding |inst|. Returns true if the substitution happened. The position
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// of the new instructions will be in the same place as the load feeding the
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// extract.
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bool ReplaceExtract(Instruction* inst);
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// Returns true if the OpCompositeExtract instruction |inst| should be replace
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// or not. This is determined by looking at the load that feeds |inst| if
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// it is a load. |should_replace_cache_| is used to cache the results based
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// on the load feeding |inst|.
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bool ShouldReplaceExtract(Instruction* inst);
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// Threshold to determine whether we have to replace the load or not. If the
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// ratio of the used components of the load is less than the threshold, we
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// replace the load.
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double replacement_threshold_;
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// Maps the result id of an OpLoad instruction to the result of whether or
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// not the OpCompositeExtract that use the id should be replaced.
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std::unordered_map<uint32_t, bool> should_replace_cache_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_REDUCE_LOAD_SIZE_H_
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