113 lines
4.5 KiB
C++
113 lines
4.5 KiB
C++
// 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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// Replaces the given compososite variable |var| loaded by OpLoad |value| with
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// replacement variables, one for each component that's accessed in the
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// shader. Assumes that |value| is only used by OpCompositeExtract
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// instructions, one index at a time. Returns true on success, and false
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// otherwise.
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bool ReplaceLoadedValue(Instruction* var, Instruction* value);
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// Replaces the given OpCompositeExtract |extract| and all of its references
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// with an OpLoad of a replacement variable. |var| is the variable with
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// composite type whose value is being used by |extract|. Assumes that
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// |extract| is extracting one index only. Returns true on success, and false
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// otherwise.
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bool ReplaceCompositeExtract(Instruction* var, Instruction* extract);
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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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// Returns the number of bindings used by the given |type_id|.
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// All types are considered to use 1 binding slot, except:
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// 1- A pointer type consumes as many binding numbers as its pointee.
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// 2- An array of size N consumes N*M binding numbers, where M is the number
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// of bindings used by each array element.
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// 3- The number of bindings consumed by a structure is the sum of the
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// bindings used by its members.
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uint32_t GetNumBindingsUsedByType(uint32_t type_id);
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// Returns true if |type| is a type that could be used for a structured buffer
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// as opposed to a type that would be used for a structure of resource
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// descriptors.
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bool IsTypeOfStructuredBuffer(const Instruction* type) const;
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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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