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https://github.com/KhronosGroup/SPIRV-Tools
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b31baff4ee
This pass allows to re-assign offset layout decorations to tightly pack a struct according to its packing rules.
82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
// Copyright (c) 2024 Epic Games, 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_STRUCT_PACKING_PASS_
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#define SOURCE_OPT_STRUCT_PACKING_PASS_
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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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// This pass re-assigns all field offsets under the specified packing rules.
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class StructPackingPass final : public Pass {
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public:
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enum class PackingRules {
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Undefined,
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Std140,
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Std140EnhancedLayout,
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Std430,
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Std430EnhancedLayout,
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HlslCbuffer,
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HlslCbufferPackOffset,
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Scalar,
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ScalarEnhancedLayout,
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};
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static PackingRules ParsePackingRuleFromString(const std::string& s);
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StructPackingPass(const char* structToPack, PackingRules rules);
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const char* name() const override { return "struct-packing"; }
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Status Process() override;
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IRContext::Analysis GetPreservedAnalyses() override {
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return IRContext::kAnalysisCombinators | IRContext::kAnalysisCFG |
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IRContext::kAnalysisDominatorAnalysis |
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IRContext::kAnalysisLoopAnalysis | IRContext::kAnalysisNameMap |
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IRContext::kAnalysisScalarEvolution |
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IRContext::kAnalysisStructuredCFG | IRContext::kAnalysisConstants |
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IRContext::kAnalysisDebugInfo | IRContext::kAnalysisLiveness;
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}
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private:
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void buildConstantsMap();
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uint32_t findStructIdByName(const char* structName) const;
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std::vector<const analysis::Type*> findStructMemberTypes(
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const Instruction& structDef) const;
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Status assignStructMemberOffsets(
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uint32_t structIdToPack,
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const std::vector<const analysis::Type*>& structMemberTypes);
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uint32_t getPackedAlignment(const analysis::Type& type) const;
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uint32_t getPackedSize(const analysis::Type& type) const;
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uint32_t getPackedArrayStride(const analysis::Array& arrayType) const;
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uint32_t getArrayLength(const analysis::Array& arrayType) const;
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uint32_t getConstantInt(spv::Id id) const;
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private:
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std::string structToPack_;
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PackingRules packingRules_ = PackingRules::Undefined;
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std::unordered_map<spv::Id, Instruction*> constantsMap_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_STRUCT_PACKING_PASS_
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