mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-22 19:50:05 +00:00
73 lines
2.6 KiB
C++
73 lines
2.6 KiB
C++
// 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_LICM_PASS_H_
|
|
#define SOURCE_OPT_LICM_PASS_H_
|
|
|
|
#include <queue>
|
|
#include <vector>
|
|
|
|
#include "source/opt/basic_block.h"
|
|
#include "source/opt/instruction.h"
|
|
#include "source/opt/loop_descriptor.h"
|
|
#include "source/opt/pass.h"
|
|
|
|
namespace spvtools {
|
|
namespace opt {
|
|
|
|
class LICMPass : public Pass {
|
|
public:
|
|
LICMPass() {}
|
|
|
|
const char* name() const override { return "loop-invariant-code-motion"; }
|
|
Status Process() override;
|
|
|
|
private:
|
|
// Searches the IRContext for functions and processes each, moving invariants
|
|
// outside loops within the function where possible.
|
|
// Returns the status depending on whether or not there was a failure or
|
|
// change.
|
|
Pass::Status ProcessIRContext();
|
|
|
|
// Checks the function for loops, calling ProcessLoop on each one found.
|
|
// Returns the status depending on whether or not there was a failure or
|
|
// change.
|
|
Pass::Status ProcessFunction(Function* f);
|
|
|
|
// Checks for invariants in the loop and attempts to move them to the loops
|
|
// preheader. Works from inner loop to outer when nested loops are found.
|
|
// Returns the status depending on whether or not there was a failure or
|
|
// change.
|
|
Pass::Status ProcessLoop(Loop* loop, Function* f);
|
|
|
|
// Analyses each instruction in |bb|, hoisting invariants to |pre_header_bb|.
|
|
// Each child of |bb| wrt to |dom_tree| is pushed to |loop_bbs|
|
|
// Returns the status depending on whether or not there was a failure or
|
|
// change.
|
|
Pass::Status AnalyseAndHoistFromBB(Loop* loop, Function* f, BasicBlock* bb,
|
|
std::vector<BasicBlock*>* loop_bbs);
|
|
|
|
// Returns true if |bb| is immediately contained in |loop|
|
|
bool IsImmediatelyContainedInLoop(Loop* loop, Function* f, BasicBlock* bb);
|
|
|
|
// Move the instruction to the preheader of |loop|.
|
|
// This method will update the instruction to block mapping for the context
|
|
bool HoistInstruction(Loop* loop, Instruction* inst);
|
|
};
|
|
|
|
} // namespace opt
|
|
} // namespace spvtools
|
|
|
|
#endif // SOURCE_OPT_LICM_PASS_H_
|