tools/llvm-mca/Views/SummaryView.cpp

   1 //===--------------------- SummaryView.cpp -------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 /// \file
   9 ///
  10 /// This file implements the functionalities used by the SummaryView to print
  11 /// the report information.
  12 ///
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "Views/SummaryView.h"
  16 #include "llvm/ADT/SmallVector.h"
  17 #include "llvm/MCA/Support.h"
  18 #include "llvm/Support/Format.h"
  19
  20 namespace llvm {
  21 namespace mca {
  22
  23 #define DEBUG_TYPE "llvm-mca"
  24
  25 SummaryView::SummaryView(const MCSchedModel &Model, ArrayRef<MCInst> S,
  26                          unsigned Width)
  27     : SM(Model), Source(S), DispatchWidth(Width?Width: Model.IssueWidth),
  28       LastInstructionIdx(0),
  29       TotalCycles(0), NumMicroOps(0),
  30       ProcResourceUsage(Model.getNumProcResourceKinds(), 0),
  31       ProcResourceMasks(Model.getNumProcResourceKinds()),
  32       ResIdx2ProcResID(Model.getNumProcResourceKinds(), 0) {
  33   computeProcResourceMasks(SM, ProcResourceMasks);
  34   for (unsigned I = 1, E = SM.getNumProcResourceKinds(); I < E; ++I) {
  35     unsigned Index = getResourceStateIndex(ProcResourceMasks[I]);
  36     ResIdx2ProcResID[Index] = I;
  37   }
  38 }
  39
  40 void SummaryView::onEvent(const HWInstructionEvent &Event) {
  41   if (Event.Type == HWInstructionEvent::Dispatched)
  42     LastInstructionIdx = Event.IR.getSourceIndex();
  43
  44   // We are only interested in the "instruction retired" events generated by
  45   // the retire stage for instructions that are part of iteration #0.
  46   if (Event.Type != HWInstructionEvent::Retired ||
  47       Event.IR.getSourceIndex() >= Source.size())
  48     return;
  49
  50   // Update the cumulative number of resource cycles based on the processor
  51   // resource usage information available from the instruction descriptor. We
  52   // need to compute the cumulative number of resource cycles for every
  53   // processor resource which is consumed by an instruction of the block.
  54   const Instruction &Inst = *Event.IR.getInstruction();
  55   const InstrDesc &Desc = Inst.getDesc();
  56   NumMicroOps += Desc.NumMicroOps;
  57   for (const std::pair<uint64_t, const ResourceUsage> &RU : Desc.Resources) {
  58     if (RU.second.size()) {
  59       unsigned ProcResID = ResIdx2ProcResID[getResourceStateIndex(RU.first)];
  60       ProcResourceUsage[ProcResID] += RU.second.size();
  61     }
  62   }
  63 }
  64
  65 void SummaryView::printView(raw_ostream &OS) const {
  66   unsigned Instructions = Source.size();
  67   unsigned Iterations = (LastInstructionIdx / Instructions) + 1;
  68   unsigned TotalInstructions = Instructions * Iterations;
  69   unsigned TotalUOps = NumMicroOps * Iterations;
  70   double IPC = (double)TotalInstructions / TotalCycles;
  71   double UOpsPerCycle = (double)TotalUOps / TotalCycles;
  72   double BlockRThroughput = computeBlockRThroughput(
  73       SM, DispatchWidth, NumMicroOps, ProcResourceUsage);
  74
  75   std::string Buffer;
  76   raw_string_ostream TempStream(Buffer);
  77   TempStream << "Iterations:        " << Iterations;
  78   TempStream << "\nInstructions:      " << TotalInstructions;
  79   TempStream << "\nTotal Cycles:      " << TotalCycles;
  80   TempStream << "\nTotal uOps:        " << TotalUOps << '\n';
  81   TempStream << "\nDispatch Width:    " << DispatchWidth;
  82   TempStream << "\nuOps Per Cycle:    "
  83              << format("%.2f", floor((UOpsPerCycle * 100) + 0.5) / 100);
  84   TempStream << "\nIPC:               "
  85              << format("%.2f", floor((IPC * 100) + 0.5) / 100);
  86   TempStream << "\nBlock RThroughput: "
  87              << format("%.1f", floor((BlockRThroughput * 10) + 0.5) / 10)
  88              << '\n';
  89   TempStream.flush();
  90   OS << Buffer;
  91 }
  92
  93 } // namespace mca.
  94 } // namespace llvm