73 lines
2.6 KiB
C++
73 lines
2.6 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_LICM_PASS_H_
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#define SOURCE_OPT_LICM_PASS_H_
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#include <queue>
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#include <vector>
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#include "source/opt/basic_block.h"
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#include "source/opt/instruction.h"
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#include "source/opt/loop_descriptor.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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class LICMPass : public Pass {
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public:
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LICMPass() {}
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const char* name() const override { return "loop-invariant-code-motion"; }
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Status Process() override;
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private:
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// Searches the IRContext for functions and processes each, moving invariants
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// outside loops within the function where possible.
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// Returns the status depending on whether or not there was a failure or
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// change.
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Pass::Status ProcessIRContext();
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// Checks the function for loops, calling ProcessLoop on each one found.
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// Returns the status depending on whether or not there was a failure or
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// change.
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Pass::Status ProcessFunction(Function* f);
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// Checks for invariants in the loop and attempts to move them to the loops
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// preheader. Works from inner loop to outer when nested loops are found.
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// Returns the status depending on whether or not there was a failure or
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// change.
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Pass::Status ProcessLoop(Loop* loop, Function* f);
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// Analyses each instruction in |bb|, hoisting invariants to |pre_header_bb|.
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// Each child of |bb| wrt to |dom_tree| is pushed to |loop_bbs|
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// Returns the status depending on whether or not there was a failure or
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// change.
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Pass::Status AnalyseAndHoistFromBB(Loop* loop, Function* f, BasicBlock* bb,
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std::vector<BasicBlock*>* loop_bbs);
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// Returns true if |bb| is immediately contained in |loop|
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bool IsImmediatelyContainedInLoop(Loop* loop, Function* f, BasicBlock* bb);
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// Move the instruction to the preheader of |loop|.
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// This method will update the instruction to block mapping for the context
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bool HoistInstruction(Loop* loop, 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_LICM_PASS_H_
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