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112 lines
4.0 KiB
C++
112 lines
4.0 KiB
C++
//===--------------------- ResourcePressureView.h ---------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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/// \file
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///
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/// This file define class ResourcePressureView.
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/// Class ResourcePressureView observes hardware events generated by
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/// the Backend object and collects statistics related to resource usage at
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/// instruction granularity.
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/// Resource pressure information is then printed out to a stream in the
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/// form of a table like the one from the example below:
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///
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/// Resources:
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/// [0] - JALU0
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/// [1] - JALU1
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/// [2] - JDiv
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/// [3] - JFPM
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/// [4] - JFPU0
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/// [5] - JFPU1
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/// [6] - JLAGU
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/// [7] - JSAGU
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/// [8] - JSTC
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/// [9] - JVIMUL
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///
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/// Resource pressure per iteration:
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/// [0] [1] [2] [3] [4] [5] [6] [7] [8] [9]
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/// 0.00 0.00 0.00 0.00 2.00 2.00 0.00 0.00 0.00 0.00
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///
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/// Resource pressure by instruction:
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/// [0] [1] [2] [3] [4] [5] [6] [7] [8] [9] Instructions:
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/// - - - - - 1.00 - - - - vpermilpd $1, %xmm0,
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/// %xmm1
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/// - - - - 1.00 - - - - - vaddps %xmm0, %xmm1,
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/// %xmm2
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/// - - - - - 1.00 - - - - vmovshdup %xmm2, %xmm3
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/// - - - - 1.00 - - - - - vaddss %xmm2, %xmm3,
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/// %xmm4
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///
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/// In this example, we have AVX code executed on AMD Jaguar (btver2).
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/// Both shuffles and vector floating point add operations on XMM registers have
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/// a reciprocal throughput of 1cy.
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/// Each add is issued to pipeline JFPU0, while each shuffle is issued to
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/// pipeline JFPU1. The overall pressure per iteration is reported by two
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/// tables: the first smaller table is the resource pressure per iteration;
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/// the second table reports resource pressure per instruction. Values are the
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/// average resource cycles consumed by an instruction.
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/// Every vector add from the example uses resource JFPU0 for an average of 1cy
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/// per iteration. Consequently, the resource pressure on JFPU0 is of 2cy per
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/// iteration.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_MCA_RESOURCEPRESSUREVIEW_H
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#define LLVM_TOOLS_LLVM_MCA_RESOURCEPRESSUREVIEW_H
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#include "SourceMgr.h"
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#include "View.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/MC/MCInstPrinter.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include <map>
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namespace mca {
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class Backend;
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/// This class collects resource pressure statistics and it is able to print
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/// out all the collected information as a table to an output stream.
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class ResourcePressureView : public View {
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const llvm::MCSubtargetInfo &STI;
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llvm::MCInstPrinter &MCIP;
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const SourceMgr &Source;
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// Map to quickly obtain the ResourceUsage column index from a processor
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// resource ID.
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llvm::DenseMap<unsigned, unsigned> Resource2VecIndex;
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// Table of resources used by instructions.
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std::vector<double> ResourceUsage;
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unsigned NumResourceUnits;
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const llvm::MCInst &GetMCInstFromIndex(unsigned Index) const;
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void printResourcePressurePerIteration(llvm::raw_ostream &OS,
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unsigned Executions) const;
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void printResourcePressurePerInstruction(llvm::raw_ostream &OS,
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unsigned Executions) const;
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void initialize();
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public:
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ResourcePressureView(const llvm::MCSubtargetInfo &sti,
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llvm::MCInstPrinter &Printer, const SourceMgr &SM)
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: STI(sti), MCIP(Printer), Source(SM) {
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initialize();
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}
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void onInstructionEvent(const HWInstructionEvent &Event) override;
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void printView(llvm::raw_ostream &OS) const override {
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unsigned Executions = Source.getNumIterations();
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printResourcePressurePerIteration(OS, Executions);
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printResourcePressurePerInstruction(OS, Executions);
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}
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};
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} // namespace mca
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#endif
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