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https://github.com/KhronosGroup/SPIRV-Tools
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76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
// Copyright (c) 2022 The Khronos Group Inc.
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// Copyright (c) 2022 LunarG Inc.
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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_ELIMINATE_DEAD_INPUT_COMPONENTS_H_
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#define SOURCE_OPT_ELIMINATE_DEAD_INPUT_COMPONENTS_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 EliminateDeadIOComponentsPass : public Pass {
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public:
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explicit EliminateDeadIOComponentsPass(spv::StorageClass elim_sclass,
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bool safe_mode = true)
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: elim_sclass_(elim_sclass), safe_mode_(safe_mode) {}
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const char* name() const override {
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return "eliminate-dead-input-components";
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}
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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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// Find the max constant used to index the variable declared by |var|
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// through OpAccessChain or OpInBoundsAccessChain. If any non-constant
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// indices or non-Op*AccessChain use of |var|, return |original_max|.
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unsigned FindMaxIndex(const Instruction& var, const unsigned original_max,
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const bool skip_first_index = false);
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// Change the length of the array |inst| to |length|
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void ChangeArrayLength(Instruction& inst, unsigned length);
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// Change the length of the struct in |io_var| to |length|. |io_var|
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// is either the struct or a per-vertex-array of the struct.
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void ChangeIOVarStructLength(Instruction& io_var, unsigned length);
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// Storage class to be optimized. Must be Input or Output.
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spv::StorageClass elim_sclass_;
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// Only make changes that will not cause interface incompatibility if done
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// standalone. Currently this is only Input variables in vertex shaders.
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bool safe_mode_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_ELIMINATE_DEAD_INPUT_COMPONENTS_H_
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