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//===--------------------- RegisterFileStatistics.h -------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This view collects and prints register file usage statistics.
///
/// Example (-mcpu=btver2):
/// ========================
///
/// Register File statistics:
/// Total number of mappings created: 6
/// Max number of mappings used: 3
///
/// * Register File #1 -- FpuPRF:
/// Number of physical registers: 72
/// Total number of mappings created: 0
/// Max number of mappings used: 0
/// Number of optimizable moves: 200
/// Number of moves eliminated: 200 (100.0%)
/// Number of zero moves: 200 (100.0%)
/// Max moves eliminated per cycle: 2
///
/// * Register File #2 -- IntegerPRF:
/// Number of physical registers: 64
/// Total number of mappings created: 6
/// Max number of mappings used: 3
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLVM_MCA_REGISTERFILESTATISTICS_H
#define LLVM_TOOLS_LLVM_MCA_REGISTERFILESTATISTICS_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MCA/View.h"
namespace llvm {
namespace mca {
class RegisterFileStatistics : public View {
const llvm::MCSubtargetInfo &STI;
// Used to track the number of physical registers used in a register file.
struct RegisterFileUsage {
unsigned TotalMappings;
unsigned MaxUsedMappings;
unsigned CurrentlyUsedMappings;
};
struct MoveEliminationInfo {
unsigned TotalMoveEliminationCandidates;
unsigned TotalMovesEliminated;
unsigned TotalMovesThatPropagateZero;
unsigned MaxMovesEliminatedPerCycle;
unsigned CurrentMovesEliminated;
};
// There is one entry for each register file implemented by the processor.
llvm::SmallVector<RegisterFileUsage, 4> PRFUsage;
llvm::SmallVector<MoveEliminationInfo, 4> MoveElimInfo;
void updateRegisterFileUsage(ArrayRef<unsigned> UsedPhysRegs);
void updateMoveElimInfo(const Instruction &Inst);
public:
RegisterFileStatistics(const llvm::MCSubtargetInfo &sti);
void onCycleEnd() override;
void onEvent(const HWInstructionEvent &Event) override;
void printView(llvm::raw_ostream &OS) const override;
StringRef getNameAsString() const override {
return "RegisterFileStatistics";
}
bool isSerializable() const override { return false; }
};
} // namespace mca
} // namespace llvm
#endif
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