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https://github.com/KhronosGroup/SPIRV-Tools
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71aa48f91d
* Add OperandToUndefReductionPass. Fixes #2115. Also added some tests that are similar to those in OperandToConstantReductionPassTest. In addition, refactor FindOrCreateGlobalUndef into reduction_util.cpp. Fixes #2184. Removed many documentation comments that were identical or very similar to the overridden function's documentation comment.
60 lines
2.3 KiB
C++
60 lines
2.3 KiB
C++
// Copyright (c) 2018 Google 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_REDUCE_OPERAND_TO_DOMINATING_ID_REDUCTION_PASS_H_
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#define SOURCE_REDUCE_OPERAND_TO_DOMINATING_ID_REDUCTION_PASS_H_
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#include "reduction_pass.h"
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namespace spvtools {
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namespace reduce {
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// A reduction pass that aims to bring to SPIR-V (and generalize) the idea from
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// human-readable languages of e.g. replacing an expression with one of its
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// arguments, (x + y) -> x, or with a reference to an identifier that was
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// assigned to higher up in the program. The generalization of this is to
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// replace an id with a different id of the same type defined in some
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// dominating instruction.
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//
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// If id x is defined and then used several times, changing each use of x to
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// some dominating definition may eventually allow the statement defining x
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// to be eliminated by another pass.
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class OperandToDominatingIdReductionPass : public ReductionPass {
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public:
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// Creates the reduction pass in the context of the given target environment
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// |target_env|
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explicit OperandToDominatingIdReductionPass(const spv_target_env target_env)
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: ReductionPass(target_env) {}
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~OperandToDominatingIdReductionPass() override = default;
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std::string GetName() const final;
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protected:
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std::vector<std::unique_ptr<ReductionOpportunity>> GetAvailableOpportunities(
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opt::IRContext* context) const final;
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private:
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void GetOpportunitiesForDominatingInst(
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std::vector<std::unique_ptr<ReductionOpportunity>>* opportunities,
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opt::Instruction* dominating_instruction,
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opt::Function::iterator candidate_dominator_block,
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opt::Function* function, opt::IRContext* context) const;
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};
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} // namespace reduce
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} // namespace spvtools
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#endif // SOURCE_REDUCE_OPERAND_TO_DOMINATING_ID_REDUCTION_PASS_H_
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