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104 lines
3.8 KiB
C++
104 lines
3.8 KiB
C++
//===--------------------- ResourcePressureView.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 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 "Views/View.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstPrinter.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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namespace llvm {
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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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llvm::ArrayRef<llvm::MCInst> Source;
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unsigned LastInstructionIdx;
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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<ResourceCycles> ResourceUsage;
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unsigned NumResourceUnits;
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void printResourcePressurePerIter(llvm::raw_ostream &OS) const;
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void printResourcePressurePerInst(llvm::raw_ostream &OS) const;
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public:
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ResourcePressureView(const llvm::MCSubtargetInfo &sti,
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llvm::MCInstPrinter &Printer,
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llvm::ArrayRef<llvm::MCInst> S);
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void onEvent(const HWInstructionEvent &Event) override;
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void printView(llvm::raw_ostream &OS) const override {
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printResourcePressurePerIter(OS);
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printResourcePressurePerInst(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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