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// Copyright (c) 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SOURCE_OPT_COMBINE_ACCESS_CHAINS_H_
#define SOURCE_OPT_COMBINE_ACCESS_CHAINS_H_
#include <vector>
#include "source/opt/pass.h"
namespace spvtools {
namespace opt {
// See optimizer.hpp for documentation.
class CombineAccessChains : public Pass {
public:
const char* name() const override { return "combine-access-chains"; }
Status Process() override;
IRContext::Analysis GetPreservedAnalyses() override {
return IRContext::kAnalysisDefUse |
IRContext::kAnalysisInstrToBlockMapping |
IRContext::kAnalysisDecorations | IRContext::kAnalysisCombinators |
IRContext::kAnalysisCFG | IRContext::kAnalysisDominatorAnalysis |
IRContext::kAnalysisNameMap | IRContext::kAnalysisConstants |
IRContext::kAnalysisTypes;
}
private:
// Combine access chains in |function|. Blocks are processed in reverse
// post-order. Returns true if the function is modified.
bool ProcessFunction(Function& function);
// Combines an access chain (normal, in bounds or pointer) |inst| if its base
// pointer is another access chain. Returns true if the access chain was
// modified.
bool CombineAccessChain(Instruction* inst);
// Returns the value of |constant_inst| as a uint32_t.
uint32_t GetConstantValue(const analysis::Constant* constant_inst);
// Returns the array stride of |inst|'s type.
uint32_t GetArrayStride(const Instruction* inst);
// Returns the type by resolving the index operands |inst|. |inst| must be an
// access chain instruction.
const analysis::Type* GetIndexedType(Instruction* inst);
// Populates |new_operands| with the operands for the combined access chain.
// Returns false if the access chains cannot be combined.
bool CreateNewInputOperands(Instruction* ptr_input, Instruction* inst,
std::vector<Operand>* new_operands);
// Combines the last index of |ptr_input| with the element operand of |inst|.
// Adds the combined operand to |new_operands|.
bool CombineIndices(Instruction* ptr_input, Instruction* inst,
std::vector<Operand>* new_operands);
// Returns the opcode to use for the combined access chain.
spv::Op UpdateOpcode(spv::Op base_opcode, spv::Op input_opcode);
// Returns true if |opcode| is a pointer access chain.
bool IsPtrAccessChain(spv::Op opcode);
// Returns true if |inst| (an access chain) has 64-bit indices.
bool Has64BitIndices(Instruction* inst);
};
} // namespace opt
} // namespace spvtools
#endif // SOURCE_OPT_COMBINE_ACCESS_CHAINS_H_
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