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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
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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