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12a71b7b2e
Summary: This change renames the Backend and BackendPrinter to Pipeline and PipelinePrinter respectively. Variables and comments have also been updated to reflect this change. The reason for this rename, is to be slightly more correct about what MCA is modeling. MCA models a Pipeline, which implies some logical sequence of stages. Reviewers: andreadb, courbet, RKSimon Reviewed By: andreadb, courbet Subscribers: mgorny, javed.absar, tschuett, gbedwell, llvm-commits Differential Revision: https://reviews.llvm.org/D48496 llvm-svn: 335496
110 lines
4.0 KiB
C++
110 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 Pipeline 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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/// 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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