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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
//===--------------------- RegisterFileStatistics.h -------------*- 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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/// \file
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///
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/// This view collects and prints register file usage statistics.
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///
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/// Example (-mcpu=btver2):
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/// ========================
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///
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/// Register File statistics:
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/// Total number of mappings created: 6
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/// Max number of mappings used: 3
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///
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/// * Register File #1 -- FpuPRF:
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/// Number of physical registers: 72
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/// Total number of mappings created: 0
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/// Max number of mappings used: 0
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/// Number of optimizable moves: 200
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/// Number of moves eliminated: 200 (100.0%)
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/// Number of zero moves: 200 (100.0%)
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/// Max moves eliminated per cycle: 2
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///
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/// * Register File #2 -- IntegerPRF:
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/// Number of physical registers: 64
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/// Total number of mappings created: 6
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/// Max number of mappings used: 3
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_MCA_REGISTERFILESTATISTICS_H
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#define LLVM_TOOLS_LLVM_MCA_REGISTERFILESTATISTICS_H
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#include "Views/View.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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namespace llvm {
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namespace mca {
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class RegisterFileStatistics : public View {
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const llvm::MCSubtargetInfo &STI;
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// Used to track the number of physical registers used in a register file.
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struct RegisterFileUsage {
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unsigned TotalMappings;
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unsigned MaxUsedMappings;
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unsigned CurrentlyUsedMappings;
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};
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struct MoveEliminationInfo {
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unsigned TotalMoveEliminationCandidates;
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unsigned TotalMovesEliminated;
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unsigned TotalMovesThatPropagateZero;
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unsigned MaxMovesEliminatedPerCycle;
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unsigned CurrentMovesEliminated;
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};
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// There is one entry for each register file implemented by the processor.
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llvm::SmallVector<RegisterFileUsage, 4> PRFUsage;
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llvm::SmallVector<MoveEliminationInfo, 4> MoveElimInfo;
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void updateRegisterFileUsage(ArrayRef<unsigned> UsedPhysRegs);
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void updateMoveElimInfo(const Instruction &Inst);
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public:
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RegisterFileStatistics(const llvm::MCSubtargetInfo &sti);
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void onCycleEnd() override;
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void onEvent(const HWInstructionEvent &Event) override;
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void printView(llvm::raw_ostream &OS) const override;
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};
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} // namespace mca
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} // namespace llvm
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#endif
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