| //===--------------------- 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 "Views/View.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/MC/MCSubtargetInfo.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; |
| }; |
| } // namespace mca |
| } // namespace llvm |
| |
| #endif |