mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-25 13:00:04 +00:00
79 lines
2.7 KiB
C++
79 lines
2.7 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_LOOP_FISSION_H_
|
|
#define SOURCE_OPT_LOOP_FISSION_H_
|
|
|
|
#include <algorithm>
|
|
#include <cstdint>
|
|
#include <map>
|
|
#include <utility>
|
|
#include <vector>
|
|
|
|
#include "source/opt/cfg.h"
|
|
#include "source/opt/loop_dependence.h"
|
|
#include "source/opt/loop_utils.h"
|
|
#include "source/opt/module.h"
|
|
#include "source/opt/pass.h"
|
|
#include "source/opt/tree_iterator.h"
|
|
|
|
namespace spvtools {
|
|
namespace opt {
|
|
|
|
class LoopFissionPass : public Pass {
|
|
public:
|
|
// Function used to determine if a given loop should be split. Takes register
|
|
// pressure region for that loop as a parameter and returns true if the loop
|
|
// should be split.
|
|
using FissionCriteriaFunction =
|
|
std::function<bool(const RegisterLiveness::RegionRegisterLiveness&)>;
|
|
|
|
// Pass built with this constructor will split all loops regardless of
|
|
// register pressure. Will not split loops more than once.
|
|
LoopFissionPass();
|
|
|
|
// Split the loop if the number of registers used in the loop exceeds
|
|
// |register_threshold_to_split|. |split_multiple_times| flag determines
|
|
// whether or not the pass should split loops after already splitting them
|
|
// once.
|
|
LoopFissionPass(size_t register_threshold_to_split,
|
|
bool split_multiple_times = true);
|
|
|
|
// Split loops whose register pressure meets the criteria of |functor|.
|
|
LoopFissionPass(FissionCriteriaFunction functor,
|
|
bool split_multiple_times = true)
|
|
: split_criteria_(functor), split_multiple_times_(split_multiple_times) {}
|
|
|
|
const char* name() const override { return "loop-fission"; }
|
|
|
|
Pass::Status Process() override;
|
|
|
|
// Checks if |loop| meets the register pressure criteria to be split.
|
|
bool ShouldSplitLoop(const Loop& loop, IRContext* context);
|
|
|
|
private:
|
|
// Functor to run in ShouldSplitLoop to determine if the register pressure
|
|
// criteria is met for splitting the loop.
|
|
FissionCriteriaFunction split_criteria_;
|
|
|
|
// Flag designating whether or not we should also split the result of
|
|
// previously split loops if they meet the register presure criteria.
|
|
bool split_multiple_times_;
|
|
};
|
|
|
|
} // namespace opt
|
|
} // namespace spvtools
|
|
|
|
#endif // SOURCE_OPT_LOOP_FISSION_H_
|