1 //===--------------------- RegisterFileStatistics.h -------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 /// \file 9 /// 10 /// This view collects and prints register file usage statistics. 11 /// 12 /// Example (-mcpu=btver2): 13 /// ======================== 14 /// 15 /// Register File statistics: 16 /// Total number of mappings created: 6 17 /// Max number of mappings used: 3 18 /// 19 /// * Register File #1 -- FpuPRF: 20 /// Number of physical registers: 72 21 /// Total number of mappings created: 0 22 /// Max number of mappings used: 0 23 /// Number of optimizable moves: 200 24 /// Number of moves eliminated: 200 (100.0%) 25 /// Number of zero moves: 200 (100.0%) 26 /// Max moves eliminated per cycle: 2 27 /// 28 /// * Register File #2 -- IntegerPRF: 29 /// Number of physical registers: 64 30 /// Total number of mappings created: 6 31 /// Max number of mappings used: 3 32 // 33 //===----------------------------------------------------------------------===// 34 35 #ifndef LLVM_TOOLS_LLVM_MCA_REGISTERFILESTATISTICS_H 36 #define LLVM_TOOLS_LLVM_MCA_REGISTERFILESTATISTICS_H 37 38 #include "llvm/ADT/SmallVector.h" 39 #include "llvm/MC/MCSubtargetInfo.h" 40 #include "llvm/MCA/View.h" 41 42 namespace llvm { 43 namespace mca { 44 45 class RegisterFileStatistics : public View { 46 const llvm::MCSubtargetInfo &STI; 47 48 // Used to track the number of physical registers used in a register file. 49 struct RegisterFileUsage { 50 unsigned TotalMappings; 51 unsigned MaxUsedMappings; 52 unsigned CurrentlyUsedMappings; 53 }; 54 55 struct MoveEliminationInfo { 56 unsigned TotalMoveEliminationCandidates; 57 unsigned TotalMovesEliminated; 58 unsigned TotalMovesThatPropagateZero; 59 unsigned MaxMovesEliminatedPerCycle; 60 unsigned CurrentMovesEliminated; 61 }; 62 63 // There is one entry for each register file implemented by the processor. 64 llvm::SmallVector<RegisterFileUsage, 4> PRFUsage; 65 llvm::SmallVector<MoveEliminationInfo, 4> MoveElimInfo; 66 67 void updateRegisterFileUsage(ArrayRef<unsigned> UsedPhysRegs); 68 void updateMoveElimInfo(const Instruction &Inst); 69 70 public: 71 RegisterFileStatistics(const llvm::MCSubtargetInfo &sti); 72 73 void onCycleEnd() override; 74 void onEvent(const HWInstructionEvent &Event) override; 75 void printView(llvm::raw_ostream &OS) const override; getNameAsString()76 StringRef getNameAsString() const override { 77 return "RegisterFileStatistics"; 78 } isSerializable()79 bool isSerializable() const override { return false; } 80 }; 81 } // namespace mca 82 } // namespace llvm 83 84 #endif 85