90 lines
3.7 KiB
C++
90 lines
3.7 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 SOURCE_OPT_IF_CONVERSION_H_
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#define SOURCE_OPT_IF_CONVERSION_H_
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#include "source/opt/basic_block.h"
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#include "source/opt/ir_builder.h"
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#include "source/opt/pass.h"
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#include "source/opt/types.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 IfConversion : public Pass {
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public:
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const char* name() const override { return "if-conversion"; }
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Status Process() override;
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IRContext::Analysis GetPreservedAnalyses() override {
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return IRContext::kAnalysisDefUse | IRContext::kAnalysisDominatorAnalysis |
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IRContext::kAnalysisInstrToBlockMapping | IRContext::kAnalysisCFG |
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IRContext::kAnalysisNameMap | IRContext::kAnalysisConstants |
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IRContext::kAnalysisTypes;
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}
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private:
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// Returns true if |id| is a valid type for use with OpSelect. OpSelect only
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// allows scalars, vectors and pointers as valid inputs.
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bool CheckType(uint32_t id);
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// Returns the basic block containing |id|.
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BasicBlock* GetBlock(uint32_t id);
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// Returns the basic block for the |predecessor|'th index predecessor of
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// |phi|.
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BasicBlock* GetIncomingBlock(Instruction* phi, uint32_t predecessor);
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// Returns the instruction defining the |predecessor|'th index of |phi|.
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Instruction* GetIncomingValue(Instruction* phi, uint32_t predecessor);
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// Returns the id of a OpCompositeConstruct boolean vector. The composite has
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// the same number of elements as |vec_data_ty| and each member is |cond|.
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// |where| indicates the location in |block| to insert the composite
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// construct. If necessary, this function will also construct the necessary
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// type instructions for the boolean vector.
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uint32_t SplatCondition(analysis::Vector* vec_data_ty, uint32_t cond,
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InstructionBuilder* builder);
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// Returns true if none of |phi|'s users are in |block|.
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bool CheckPhiUsers(Instruction* phi, BasicBlock* block);
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// Returns |false| if |block| is not appropriate to transform. Only
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// transforms blocks with two predecessors. Neither incoming block can be
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// dominated by |block|. Both predecessors must share a common dominator that
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// is terminated by a conditional branch.
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bool CheckBlock(BasicBlock* block, DominatorAnalysis* dominators,
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BasicBlock** common);
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// Moves |inst| to |target_block| if it does not already dominate the block.
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// Any instructions that |inst| depends on are move if necessary. It is
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// assumed that |inst| can be hoisted to |target_block| as defined by
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// |CanHoistInstruction|. |dominators| is the dominator analysis for the
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// function that contains |target_block|.
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void HoistInstruction(Instruction* inst, BasicBlock* target_block,
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DominatorAnalysis* dominators);
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// Returns true if it is legal to move |inst| and the instructions it depends
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// on to |target_block| if they do not already dominate |target_block|.
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bool CanHoistInstruction(Instruction* inst, BasicBlock* target_block,
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DominatorAnalysis* dominators);
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};
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_IF_CONVERSION_H_
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