86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
//===--------------------- DispatchStatistics.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 file implements a view that prints a few statistics related to the
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/// dispatch logic. It collects and analyzes instruction dispatch events as
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/// well as static/dynamic dispatch stall events.
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///
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/// Example:
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/// ========
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///
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/// Dynamic Dispatch Stall Cycles:
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/// RAT - Register unavailable: 0
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/// RCU - Retire tokens unavailable: 0
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/// SCHEDQ - Scheduler full: 42
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/// LQ - Load queue full: 0
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/// SQ - Store queue full: 0
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/// GROUP - Static restrictions on the dispatch group: 0
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///
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///
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/// Dispatch Logic - number of cycles where we saw N micro opcodes dispatched:
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/// [# dispatched], [# cycles]
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/// 0, 15 (11.5%)
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/// 2, 4 (3.1%)
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_MCA_DISPATCHVIEW_H
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#define LLVM_TOOLS_LLVM_MCA_DISPATCHVIEW_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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#include <map>
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namespace llvm {
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namespace mca {
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class DispatchStatistics : public View {
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unsigned NumDispatched;
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unsigned NumCycles;
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// Counts dispatch stall events caused by unavailability of resources. There
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// is one counter for every generic stall kind (see class HWStallEvent).
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llvm::SmallVector<unsigned, 8> HWStalls;
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using Histogram = std::map<unsigned, unsigned>;
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Histogram DispatchGroupSizePerCycle;
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void updateHistograms() {
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DispatchGroupSizePerCycle[NumDispatched]++;
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NumDispatched = 0;
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}
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void printDispatchHistogram(llvm::raw_ostream &OS) const;
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void printDispatchStalls(llvm::raw_ostream &OS) const;
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public:
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DispatchStatistics()
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: NumDispatched(0), NumCycles(0),
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HWStalls(HWStallEvent::LastGenericEvent) {}
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void onEvent(const HWStallEvent &Event) override;
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void onEvent(const HWInstructionEvent &Event) override;
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void onCycleBegin() override { NumCycles++; }
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void onCycleEnd() override { updateHistograms(); }
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void printView(llvm::raw_ostream &OS) const override {
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printDispatchStalls(OS);
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printDispatchHistogram(OS);
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}
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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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