76 lines
3.0 KiB
C++
76 lines
3.0 KiB
C++
//==- RegAllocScore.h - evaluate regalloc policy quality ----------*-C++-*-==//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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/// Calculate a measure of the register allocation policy quality. This is used
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/// to construct a reward for the training of the ML-driven allocation policy.
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/// Currently, the score is the sum of the machine basic block frequency-weighed
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/// number of loads, stores, copies, and remat instructions, each factored with
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/// a relative weight.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_REGALLOCSCORE_H_
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#define LLVM_CODEGEN_REGALLOCSCORE_H_
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#include "llvm/ADT/STLFunctionalExtras.h"
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namespace llvm {
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class AAResults;
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class MachineBasicBlock;
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class MachineBlockFrequencyInfo;
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class MachineFunction;
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class MachineInstr;
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/// Regalloc score.
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class RegAllocScore final {
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double CopyCounts = 0.0;
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double LoadCounts = 0.0;
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double StoreCounts = 0.0;
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double CheapRematCounts = 0.0;
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double LoadStoreCounts = 0.0;
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double ExpensiveRematCounts = 0.0;
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public:
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RegAllocScore() = default;
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RegAllocScore(const RegAllocScore &) = default;
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double copyCounts() const { return CopyCounts; }
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double loadCounts() const { return LoadCounts; }
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double storeCounts() const { return StoreCounts; }
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double loadStoreCounts() const { return LoadStoreCounts; }
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double expensiveRematCounts() const { return ExpensiveRematCounts; }
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double cheapRematCounts() const { return CheapRematCounts; }
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void onCopy(double Freq) { CopyCounts += Freq; }
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void onLoad(double Freq) { LoadCounts += Freq; }
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void onStore(double Freq) { StoreCounts += Freq; }
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void onLoadStore(double Freq) { LoadStoreCounts += Freq; }
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void onExpensiveRemat(double Freq) { ExpensiveRematCounts += Freq; }
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void onCheapRemat(double Freq) { CheapRematCounts += Freq; }
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RegAllocScore &operator+=(const RegAllocScore &Other);
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bool operator==(const RegAllocScore &Other) const;
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bool operator!=(const RegAllocScore &Other) const;
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double getScore() const;
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};
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/// Calculate a score. When comparing 2 scores for the same function but
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/// different policies, the better policy would have a smaller score.
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/// The implementation is the overload below (which is also easily unittestable)
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RegAllocScore calculateRegAllocScore(const MachineFunction &MF,
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const MachineBlockFrequencyInfo &MBFI,
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AAResults &AAResults);
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/// Implementation of the above, which is also more easily unittestable.
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RegAllocScore calculateRegAllocScore(
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const MachineFunction &MF,
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llvm::function_ref<double(const MachineBasicBlock &)> GetBBFreq,
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llvm::function_ref<bool(const MachineInstr &)> IsTriviallyRematerializable);
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} // end namespace llvm
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#endif // LLVM_CODEGEN_REGALLOCSCORE_H_
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