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https://github.com/KhronosGroup/SPIRV-Tools
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74 lines
3.1 KiB
C++
74 lines
3.1 KiB
C++
// Copyright (c) 2017 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_OPT_PRIVATE_TO_LOCAL_PASS_H_
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#define SOURCE_OPT_PRIVATE_TO_LOCAL_PASS_H_
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#include "source/opt/ir_context.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 implements total redundancy elimination. This is the same as
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// local redundancy elimination except it looks across basic block boundaries.
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// An instruction, inst, is totally redundant if there is another instruction
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// that dominates inst, and also computes the same value.
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class PrivateToLocalPass : public Pass {
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public:
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const char* name() const override { return "private-to-local"; }
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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 | IRContext::kAnalysisConstants |
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IRContext::kAnalysisTypes;
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}
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private:
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// Moves |variable| from the private storage class to the function storage
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// class of |function|. Returns false if the variable could not be moved.
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bool MoveVariable(Instruction* variable, Function* function);
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// |inst| is an instruction declaring a varible. If that variable is
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// referenced in a single function and all of uses are valid as defined by
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// |IsValidUse|, then that function is returned. Otherwise, the return
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// value is |nullptr|.
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Function* FindLocalFunction(const Instruction& inst) const;
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// Returns true is |inst| is a valid use of a pointer. In this case, a
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// valid use is one where the transformation is able to rewrite the type to
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// match a change in storage class of the original variable.
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bool IsValidUse(const Instruction* inst) const;
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// Given the result id of a pointer type, |old_type_id|, this function
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// returns the id of a the same pointer type except the storage class has
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// been changed to function. If the type does not already exist, it will be
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// created. Returns 0 if the new type could not be found or generated.
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uint32_t GetNewType(uint32_t old_type_id);
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// Updates |inst|, and any instruction dependent on |inst|, to reflect the
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// change of the base pointer now pointing to the function storage class.
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bool UpdateUse(Instruction* inst, Instruction* user);
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bool UpdateUses(Instruction* inst);
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};
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_PRIVATE_TO_LOCAL_PASS_H_
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