mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-01-07 11:51:13 +00:00
e2bef9a902
Before this patch, the "BackendStatistics" view was responsible for printing the register file usage (as well as many other statistics). Now users can enable register file usage statistics using the command line flag `-register-file-stats`. By default, the tool doesn't print register file statistics. llvm-svn: 329083
148 lines
4.8 KiB
C++
148 lines
4.8 KiB
C++
//===--------------------- BackendStatistics.h ------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
/// \file
|
|
///
|
|
/// This file implements a printer class for printing generic Backend
|
|
/// statistics related to the dispatch logic, scheduler and retire unit.
|
|
///
|
|
/// Example:
|
|
/// ========
|
|
///
|
|
/// Dynamic Dispatch Stall Cycles:
|
|
/// RAT - Register unavailable: 0
|
|
/// RCU - Retire tokens unavailable: 0
|
|
/// SCHEDQ - Scheduler full: 42
|
|
/// LQ - Load queue full: 0
|
|
/// SQ - Store queue full: 0
|
|
/// GROUP - Static restrictions on the dispatch group: 0
|
|
///
|
|
///
|
|
/// Dispatch Logic - number of cycles where we saw N instructions dispatched:
|
|
/// [# dispatched], [# cycles]
|
|
/// 0, 15 (11.5%)
|
|
/// 5, 4 (3.1%)
|
|
///
|
|
/// Schedulers - number of cycles where we saw N instructions issued:
|
|
/// [# issued], [# cycles]
|
|
/// 0, 7 (5.4%)
|
|
/// 1, 4 (3.1%)
|
|
/// 2, 8 (6.2%)
|
|
///
|
|
/// Retire Control Unit - number of cycles where we saw N instructions retired:
|
|
/// [# retired], [# cycles]
|
|
/// 0, 9 (6.9%)
|
|
/// 1, 6 (4.6%)
|
|
/// 2, 1 (0.8%)
|
|
/// 4, 3 (2.3%)
|
|
///
|
|
///
|
|
/// Scheduler's queue usage:
|
|
/// JALU01, 0/20
|
|
/// JFPU01, 18/18
|
|
/// JLSAGU, 0/12
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_TOOLS_LLVM_MCA_BACKENDSTATISTICS_H
|
|
#define LLVM_TOOLS_LLVM_MCA_BACKENDSTATISTICS_H
|
|
|
|
#include "View.h"
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/ADT/DenseMap.h"
|
|
#include "llvm/MC/MCSubtargetInfo.h"
|
|
|
|
namespace mca {
|
|
|
|
class BackendStatistics : public View {
|
|
const llvm::MCSubtargetInfo &STI;
|
|
|
|
using Histogram = llvm::DenseMap<unsigned, unsigned>;
|
|
Histogram DispatchGroupSizePerCycle;
|
|
Histogram RetiredPerCycle;
|
|
Histogram IssuedPerCycle;
|
|
|
|
unsigned NumDispatched;
|
|
unsigned NumIssued;
|
|
unsigned NumRetired;
|
|
unsigned NumCycles;
|
|
|
|
// Counts dispatch stall events caused by unavailability of resources. There
|
|
// is one counter for every generic stall kind (see class HWStallEvent).
|
|
llvm::SmallVector<unsigned, 8> HWStalls;
|
|
|
|
// Tracks the usage of a scheduler's queue.
|
|
struct BufferUsage {
|
|
unsigned SlotsInUse;
|
|
unsigned MaxUsedSlots;
|
|
};
|
|
|
|
// There is a map entry for each buffered resource in the scheduling model.
|
|
// Every time a buffer is consumed/freed, this view updates the corresponding
|
|
// entry.
|
|
llvm::DenseMap<unsigned, BufferUsage> BufferedResources;
|
|
|
|
void updateHistograms() {
|
|
DispatchGroupSizePerCycle[NumDispatched]++;
|
|
IssuedPerCycle[NumIssued]++;
|
|
RetiredPerCycle[NumRetired]++;
|
|
NumDispatched = 0;
|
|
NumIssued = 0;
|
|
NumRetired = 0;
|
|
}
|
|
|
|
void printRetireUnitStatistics(llvm::raw_ostream &OS) const;
|
|
void printDispatchUnitStatistics(llvm::raw_ostream &OS) const;
|
|
void printSchedulerStatistics(llvm::raw_ostream &OS) const;
|
|
|
|
void printDispatchStalls(llvm::raw_ostream &OS) const;
|
|
void printRCUStatistics(llvm::raw_ostream &OS, const Histogram &Histogram,
|
|
unsigned Cycles) const;
|
|
void printDispatchUnitUsage(llvm::raw_ostream &OS, const Histogram &Stats,
|
|
unsigned Cycles) const;
|
|
void printIssuePerCycle(const Histogram &IssuePerCycle,
|
|
unsigned TotalCycles) const;
|
|
void printSchedulerUsage(llvm::raw_ostream &OS,
|
|
const llvm::MCSchedModel &SM) const;
|
|
|
|
public:
|
|
BackendStatistics(const llvm::MCSubtargetInfo &sti)
|
|
: STI(sti), NumDispatched(0), NumIssued(0), NumRetired(0), NumCycles(0),
|
|
HWStalls(HWStallEvent::LastGenericEvent) { }
|
|
|
|
void onInstructionEvent(const HWInstructionEvent &Event) override;
|
|
|
|
void onCycleBegin(unsigned Cycle) override { NumCycles++; }
|
|
|
|
void onCycleEnd(unsigned Cycle) override { updateHistograms(); }
|
|
|
|
void onStallEvent(const HWStallEvent &Event) override {
|
|
if (Event.Type < HWStallEvent::LastGenericEvent)
|
|
HWStalls[Event.Type]++;
|
|
}
|
|
|
|
// Increases the number of used scheduler queue slots of every buffered
|
|
// resource in the Buffers set.
|
|
void onReservedBuffers(llvm::ArrayRef<unsigned> Buffers) override;
|
|
|
|
// Decreases by one the number of used scheduler queue slots of every
|
|
// buffered resource in the Buffers set.
|
|
void onReleasedBuffers(llvm::ArrayRef<unsigned> Buffers) override;
|
|
|
|
void printView(llvm::raw_ostream &OS) const override {
|
|
printDispatchStalls(OS);
|
|
printDispatchUnitStatistics(OS);
|
|
printSchedulerStatistics(OS);
|
|
printRetireUnitStatistics(OS);
|
|
printSchedulerUsage(OS, STI.getSchedModel());
|
|
}
|
|
};
|
|
} // namespace mca
|
|
|
|
#endif
|