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e2bef9a902
Before this patch, the "BackendStatistics" view was responsible for printing the register file usage (as well as many other statistics). Now users can enable register file usage statistics using the command line flag `-register-file-stats`. By default, the tool doesn't print register file statistics. llvm-svn: 329083
109 lines
3.9 KiB
C++
109 lines
3.9 KiB
C++
//===--------------------- RegisterFileStatistics.cpp -----------*- 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 implements the RegisterFileStatistics interface.
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///
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//===----------------------------------------------------------------------===//
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#include "RegisterFileStatistics.h"
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#include "llvm/Support/Format.h"
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using namespace llvm;
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namespace mca {
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void RegisterFileStatistics::initializeRegisterFileInfo() {
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const MCSchedModel &SM = STI.getSchedModel();
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RegisterFileUsage Empty = {0, 0, 0};
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if (!SM.hasExtraProcessorInfo()) {
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// Assume a single register file.
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RegisterFiles.emplace_back(Empty);
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return;
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}
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// Initialize a RegisterFileUsage for every user defined register file, plus
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// the default register file which is always at index #0.
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const MCExtraProcessorInfo &PI = SM.getExtraProcessorInfo();
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// There is always an "InvalidRegisterFile" entry in tablegen. That entry can
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// be skipped. If there are no user defined register files, then reserve a
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// single entry for the default register file at index #0.
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unsigned NumRegFiles = std::max(PI.NumRegisterFiles, 1U);
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RegisterFiles.resize(NumRegFiles);
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std::fill(RegisterFiles.begin(), RegisterFiles.end(), Empty);
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}
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void RegisterFileStatistics::onInstructionEvent(
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const HWInstructionEvent &Event) {
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switch (Event.Type) {
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default:
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break;
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case HWInstructionEvent::Retired: {
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const auto &RE = static_cast<const HWInstructionRetiredEvent &>(Event);
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for (unsigned I = 0, E = RegisterFiles.size(); I < E; ++I)
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RegisterFiles[I].CurrentlyUsedMappings -= RE.FreedPhysRegs[I];
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break;
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}
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case HWInstructionEvent::Dispatched: {
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const auto &DE = static_cast<const HWInstructionDispatchedEvent &>(Event);
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for (unsigned I = 0, E = RegisterFiles.size(); I < E; ++I) {
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RegisterFileUsage &RFU = RegisterFiles[I];
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unsigned NumUsedPhysRegs = DE.UsedPhysRegs[I];
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RFU.CurrentlyUsedMappings += NumUsedPhysRegs;
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RFU.TotalMappings += NumUsedPhysRegs;
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RFU.MaxUsedMappings =
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std::max(RFU.MaxUsedMappings, RFU.CurrentlyUsedMappings);
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}
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}
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}
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}
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void RegisterFileStatistics::printView(raw_ostream &OS) const {
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std::string Buffer;
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raw_string_ostream TempStream(Buffer);
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TempStream << "\n\nRegister File statistics:";
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const RegisterFileUsage &GlobalUsage = RegisterFiles[0];
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TempStream << "\nTotal number of mappings created: "
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<< GlobalUsage.TotalMappings;
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TempStream << "\nMax number of mappings used: "
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<< GlobalUsage.MaxUsedMappings << '\n';
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for (unsigned I = 1, E = RegisterFiles.size(); I < E; ++I) {
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const RegisterFileUsage &RFU = RegisterFiles[I];
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// Obtain the register file descriptor from the scheduling model.
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assert(STI.getSchedModel().hasExtraProcessorInfo() &&
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"Unable to find register file info!");
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const MCExtraProcessorInfo &PI =
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STI.getSchedModel().getExtraProcessorInfo();
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assert(I <= PI.NumRegisterFiles && "Unexpected register file index!");
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const MCRegisterFileDesc &RFDesc = PI.RegisterFiles[I];
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// Skip invalid register files.
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if (!RFDesc.NumPhysRegs)
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continue;
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TempStream << "\n* Register File #" << I;
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TempStream << " -- " << StringRef(RFDesc.Name) << ':';
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TempStream << "\n Number of physical registers: ";
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if (!RFDesc.NumPhysRegs)
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TempStream << "unbounded";
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else
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TempStream << RFDesc.NumPhysRegs;
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TempStream << "\n Total number of mappings created: "
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<< RFU.TotalMappings;
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TempStream << "\n Max number of mappings used: "
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<< RFU.MaxUsedMappings << '\n';
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}
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TempStream.flush();
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OS << Buffer;
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}
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} // namespace mca
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