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https://github.com/KhronosGroup/SPIRV-Tools
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755e5c9420
* Combines OpAccessChain, OpInBoundsAccessChain, OpPtrAccessChain and OpInBoundsPtrAccessChain * New folding rule to fold add with 0 for integers * Converts to a bitcast if the result type does not match the operand type V
81 lines
3.0 KiB
C++
81 lines
3.0 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 LIBSPIRV_OPT_COMBINE_ACCESS_CHAINS_H_
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#define LIBSPIRV_OPT_COMBINE_ACCESS_CHAINS_H_
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#include "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 CombineAccessChains : public Pass {
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public:
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const char* name() const override { return "combine-access-chains"; }
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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::kAnalysisDecorations | IRContext::kAnalysisCombinators |
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IRContext::kAnalysisCFG | IRContext::kAnalysisDominatorAnalysis |
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IRContext::kAnalysisNameMap;
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}
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private:
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// Combine access chains in |function|. Blocks are processed in reverse
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// post-order. Returns true if the function is modified.
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bool ProcessFunction(Function& function);
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// Combines an access chain (normal, in bounds or pointer) |inst| if its base
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// pointer is another access chain. Returns true if the access chain was
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// modified.
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bool CombineAccessChain(Instruction* inst);
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// Returns the value of |constant_inst| as a uint32_t.
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uint32_t GetConstantValue(const analysis::Constant* constant_inst);
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// Returns the array stride of |inst|'s type.
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uint32_t GetArrayStride(const Instruction* inst);
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// Returns the type by resolving the index operands |inst|. |inst| must be an
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// access chain instruction.
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const analysis::Type* GetIndexedType(Instruction* inst);
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// Populates |new_operands| with the operands for the combined access chain.
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// Returns false if the access chains cannot be combined.
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bool CreateNewInputOperands(Instruction* ptr_input, Instruction* inst,
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std::vector<Operand>* new_operands);
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// Combines the last index of |ptr_input| with the element operand of |inst|.
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// Adds the combined operand to |new_operands|.
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bool CombineIndices(Instruction* ptr_input, Instruction* inst,
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std::vector<Operand>* new_operands);
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// Returns the opcode to use for the combined access chain.
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SpvOp UpdateOpcode(SpvOp base_opcode, SpvOp input_opcode);
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// Returns true if |opcode| is a pointer access chain.
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bool IsPtrAccessChain(SpvOp opcode);
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// Returns true if |inst| (an access chain) has 64-bit indices.
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bool Has64BitIndices(Instruction* inst);
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};
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_COMBINE_ACCESS_CHAINS_H_
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