mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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85 lines
3.0 KiB
C
85 lines
3.0 KiB
C
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// Copyright (c) 2019 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_DESC_SROA_H_
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#define SOURCE_OPT_DESC_SROA_H_
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#include <cstdio>
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#include <memory>
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#include <queue>
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#include <unordered_map>
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#include <unordered_set>
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#include <vector>
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#include "source/opt/function.h"
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#include "source/opt/pass.h"
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#include "source/opt/type_manager.h"
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namespace spvtools {
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namespace opt {
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// Documented in optimizer.hpp
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class DescriptorScalarReplacement : public Pass {
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public:
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DescriptorScalarReplacement() {}
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const char* name() const override { return "descriptor-scalar-replacement"; }
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Status Process() override;
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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::kAnalysisConstants | IRContext::kAnalysisTypes;
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}
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private:
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// Returns true if |var| is an OpVariable instruction that represents a
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// descriptor array. These are the variables that we want to replace.
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bool IsCandidate(Instruction* var);
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// Replaces all references to |var| by new variables, one for each element of
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// the array |var|. The binding for the new variables corresponding to
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// element i will be the binding of |var| plus i. Returns true if successful.
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bool ReplaceCandidate(Instruction* var);
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// Replaces the base address |var| in the OpAccessChain or
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// OpInBoundsAccessChain instruction |use| by the variable that the access
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// chain accesses. The first index in |use| must be an |OpConstant|. Returns
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// |true| if successful.
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bool ReplaceAccessChain(Instruction* var, Instruction* use);
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// Returns the id of the variable that will be used to replace the |idx|th
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// element of |var|. The variable is created if it has not already been
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// created.
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uint32_t GetReplacementVariable(Instruction* var, uint32_t idx);
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// Returns the id of a new variable that can be used to replace the |idx|th
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// element of |var|.
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uint32_t CreateReplacementVariable(Instruction* var, uint32_t idx);
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// A map from an OpVariable instruction to the set of variables that will be
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// used to replace it. The entry |replacement_variables_[var][i]| is the id of
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// a variable that will be used in the place of the the ith element of the
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// array |var|. If the entry is |0|, then the variable has not been
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// created yet.
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std::map<Instruction*, std::vector<uint32_t>> replacement_variables_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_DESC_SROA_H_
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