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FU per CPU arch to 32 per intinerary allowing precise modelling of quite complex pipelines in the future. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101754 91177308-0d34-0410-b5e6-96231b3b80d8
606 lines
19 KiB
C++
606 lines
19 KiB
C++
//===- SubtargetEmitter.cpp - Generate subtarget enumerations -------------===//
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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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//
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// This tablegen backend emits subtarget enumerations.
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//
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//===----------------------------------------------------------------------===//
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#include "SubtargetEmitter.h"
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#include "CodeGenTarget.h"
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#include "Record.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/Debug.h"
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#include <algorithm>
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using namespace llvm;
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//
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// Enumeration - Emit the specified class as an enumeration.
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//
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void SubtargetEmitter::Enumeration(raw_ostream &OS,
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const char *ClassName,
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bool isBits) {
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// Get all records of class and sort
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std::vector<Record*> DefList = Records.getAllDerivedDefinitions(ClassName);
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std::sort(DefList.begin(), DefList.end(), LessRecord());
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// Open enumeration
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OS << "enum {\n";
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// For each record
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for (unsigned i = 0, N = DefList.size(); i < N;) {
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// Next record
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Record *Def = DefList[i];
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// Get and emit name
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OS << " " << Def->getName();
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// If bit flags then emit expression (1 << i)
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if (isBits) OS << " = " << " 1 << " << i;
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// Depending on 'if more in the list' emit comma
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if (++i < N) OS << ",";
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OS << "\n";
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}
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// Close enumeration
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OS << "};\n";
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}
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//
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// FeatureKeyValues - Emit data of all the subtarget features. Used by the
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// command line.
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//
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void SubtargetEmitter::FeatureKeyValues(raw_ostream &OS) {
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// Gather and sort all the features
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std::vector<Record*> FeatureList =
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Records.getAllDerivedDefinitions("SubtargetFeature");
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std::sort(FeatureList.begin(), FeatureList.end(), LessRecordFieldName());
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// Begin feature table
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OS << "// Sorted (by key) array of values for CPU features.\n"
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<< "static const llvm::SubtargetFeatureKV FeatureKV[] = {\n";
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// For each feature
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for (unsigned i = 0, N = FeatureList.size(); i < N; ++i) {
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// Next feature
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Record *Feature = FeatureList[i];
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const std::string &Name = Feature->getName();
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const std::string &CommandLineName = Feature->getValueAsString("Name");
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const std::string &Desc = Feature->getValueAsString("Desc");
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if (CommandLineName.empty()) continue;
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// Emit as { "feature", "description", featureEnum, i1 | i2 | ... | in }
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OS << " { "
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<< "\"" << CommandLineName << "\", "
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<< "\"" << Desc << "\", "
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<< Name << ", ";
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const std::vector<Record*> &ImpliesList =
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Feature->getValueAsListOfDefs("Implies");
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if (ImpliesList.empty()) {
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OS << "0";
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} else {
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for (unsigned j = 0, M = ImpliesList.size(); j < M;) {
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OS << ImpliesList[j]->getName();
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if (++j < M) OS << " | ";
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}
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}
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OS << " }";
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// Depending on 'if more in the list' emit comma
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if ((i + 1) < N) OS << ",";
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OS << "\n";
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}
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// End feature table
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OS << "};\n";
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// Emit size of table
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OS<<"\nenum {\n";
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OS<<" FeatureKVSize = sizeof(FeatureKV)/sizeof(llvm::SubtargetFeatureKV)\n";
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OS<<"};\n";
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}
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//
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// CPUKeyValues - Emit data of all the subtarget processors. Used by command
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// line.
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//
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void SubtargetEmitter::CPUKeyValues(raw_ostream &OS) {
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// Gather and sort processor information
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std::vector<Record*> ProcessorList =
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Records.getAllDerivedDefinitions("Processor");
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std::sort(ProcessorList.begin(), ProcessorList.end(), LessRecordFieldName());
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// Begin processor table
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OS << "// Sorted (by key) array of values for CPU subtype.\n"
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<< "static const llvm::SubtargetFeatureKV SubTypeKV[] = {\n";
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// For each processor
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for (unsigned i = 0, N = ProcessorList.size(); i < N;) {
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// Next processor
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Record *Processor = ProcessorList[i];
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const std::string &Name = Processor->getValueAsString("Name");
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const std::vector<Record*> &FeatureList =
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Processor->getValueAsListOfDefs("Features");
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// Emit as { "cpu", "description", f1 | f2 | ... fn },
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OS << " { "
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<< "\"" << Name << "\", "
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<< "\"Select the " << Name << " processor\", ";
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if (FeatureList.empty()) {
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OS << "0";
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} else {
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for (unsigned j = 0, M = FeatureList.size(); j < M;) {
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OS << FeatureList[j]->getName();
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if (++j < M) OS << " | ";
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}
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}
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// The "0" is for the "implies" section of this data structure.
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OS << ", 0 }";
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// Depending on 'if more in the list' emit comma
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if (++i < N) OS << ",";
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OS << "\n";
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}
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// End processor table
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OS << "};\n";
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// Emit size of table
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OS<<"\nenum {\n";
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OS<<" SubTypeKVSize = sizeof(SubTypeKV)/sizeof(llvm::SubtargetFeatureKV)\n";
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OS<<"};\n";
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}
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//
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// CollectAllItinClasses - Gathers and enumerates all the itinerary classes.
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// Returns itinerary class count.
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//
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unsigned SubtargetEmitter::CollectAllItinClasses(raw_ostream &OS,
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std::map<std::string, unsigned> &ItinClassesMap) {
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// Gather and sort all itinerary classes
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std::vector<Record*> ItinClassList =
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Records.getAllDerivedDefinitions("InstrItinClass");
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std::sort(ItinClassList.begin(), ItinClassList.end(), LessRecord());
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// For each itinerary class
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unsigned N = ItinClassList.size();
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for (unsigned i = 0; i < N; i++) {
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// Next itinerary class
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const Record *ItinClass = ItinClassList[i];
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// Get name of itinerary class
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// Assign itinerary class a unique number
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ItinClassesMap[ItinClass->getName()] = i;
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}
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// Emit size of table
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OS<<"\nenum {\n";
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OS<<" ItinClassesSize = " << N << "\n";
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OS<<"};\n";
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// Return itinerary class count
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return N;
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}
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//
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// FormItineraryStageString - Compose a string containing the stage
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// data initialization for the specified itinerary. N is the number
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// of stages.
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//
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void SubtargetEmitter::FormItineraryStageString(const std::string &Name,
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Record *ItinData,
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std::string &ItinString,
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unsigned &NStages) {
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// Get states list
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const std::vector<Record*> &StageList =
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ItinData->getValueAsListOfDefs("Stages");
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// For each stage
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unsigned N = NStages = StageList.size();
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for (unsigned i = 0; i < N;) {
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// Next stage
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const Record *Stage = StageList[i];
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// Form string as ,{ cycles, u1 | u2 | ... | un, timeinc, kind }
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int Cycles = Stage->getValueAsInt("Cycles");
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ItinString += " { " + itostr(Cycles) + ", ";
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// Get unit list
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const std::vector<Record*> &UnitList = Stage->getValueAsListOfDefs("Units");
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// For each unit
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for (unsigned j = 0, M = UnitList.size(); j < M;) {
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// Add name and bitwise or
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ItinString += Name + "FU::" + UnitList[j]->getName();
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if (++j < M) ItinString += " | ";
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}
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int TimeInc = Stage->getValueAsInt("TimeInc");
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ItinString += ", " + itostr(TimeInc);
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int Kind = Stage->getValueAsInt("Kind");
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ItinString += ", (llvm::InstrStage::ReservationKinds)" + itostr(Kind);
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// Close off stage
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ItinString += " }";
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if (++i < N) ItinString += ", ";
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}
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}
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//
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// FormItineraryOperandCycleString - Compose a string containing the
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// operand cycle initialization for the specified itinerary. N is the
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// number of operands that has cycles specified.
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//
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void SubtargetEmitter::FormItineraryOperandCycleString(Record *ItinData,
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std::string &ItinString, unsigned &NOperandCycles) {
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// Get operand cycle list
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const std::vector<int64_t> &OperandCycleList =
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ItinData->getValueAsListOfInts("OperandCycles");
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// For each operand cycle
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unsigned N = NOperandCycles = OperandCycleList.size();
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for (unsigned i = 0; i < N;) {
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// Next operand cycle
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const int OCycle = OperandCycleList[i];
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ItinString += " " + itostr(OCycle);
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if (++i < N) ItinString += ", ";
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}
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}
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//
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// EmitStageAndOperandCycleData - Generate unique itinerary stages and
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// operand cycle tables. Record itineraries for processors.
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//
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void SubtargetEmitter::EmitStageAndOperandCycleData(raw_ostream &OS,
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unsigned NItinClasses,
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std::map<std::string, unsigned> &ItinClassesMap,
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std::vector<std::vector<InstrItinerary> > &ProcList) {
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// Gather processor iteraries
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std::vector<Record*> ProcItinList =
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Records.getAllDerivedDefinitions("ProcessorItineraries");
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// If just no itinerary then don't bother
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if (ProcItinList.size() < 2) return;
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// Emit functional units for all the itineraries.
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for (unsigned i = 0, N = ProcItinList.size(); i < N; ++i) {
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// Next record
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Record *Proc = ProcItinList[i];
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std::vector<Record*> FUs = Proc->getValueAsListOfDefs("FU");
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if (FUs.empty())
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continue;
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const std::string &Name = Proc->getName();
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OS << "\n// Functional units for itineraries \"" << Name << "\"\n"
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<< "namespace " << Name << "FU {\n";
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for (unsigned j = 0, FUN = FUs.size(); j < FUN; ++j)
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OS << " const unsigned " << FUs[j]->getName()
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<< " = 1 << " << j << ";\n";
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OS << "}\n";
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}
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// Begin stages table
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std::string StageTable = "\nstatic const llvm::InstrStage Stages[] = {\n";
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StageTable += " { 0, 0, 0, llvm::InstrStage::Required }, // No itinerary\n";
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// Begin operand cycle table
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std::string OperandCycleTable = "static const unsigned OperandCycles[] = {\n";
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OperandCycleTable += " 0, // No itinerary\n";
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unsigned StageCount = 1, OperandCycleCount = 1;
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unsigned ItinStageEnum = 1, ItinOperandCycleEnum = 1;
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std::map<std::string, unsigned> ItinStageMap, ItinOperandCycleMap;
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for (unsigned i = 0, N = ProcItinList.size(); i < N; i++) {
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// Next record
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Record *Proc = ProcItinList[i];
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// Get processor itinerary name
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const std::string &Name = Proc->getName();
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// Skip default
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if (Name == "NoItineraries") continue;
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// Create and expand processor itinerary to cover all itinerary classes
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std::vector<InstrItinerary> ItinList;
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ItinList.resize(NItinClasses);
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// Get itinerary data list
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std::vector<Record*> ItinDataList = Proc->getValueAsListOfDefs("IID");
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// For each itinerary data
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for (unsigned j = 0, M = ItinDataList.size(); j < M; j++) {
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// Next itinerary data
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Record *ItinData = ItinDataList[j];
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// Get string and stage count
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std::string ItinStageString;
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unsigned NStages;
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FormItineraryStageString(Name, ItinData, ItinStageString, NStages);
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// Get string and operand cycle count
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std::string ItinOperandCycleString;
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unsigned NOperandCycles;
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FormItineraryOperandCycleString(ItinData, ItinOperandCycleString,
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NOperandCycles);
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// Check to see if stage already exists and create if it doesn't
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unsigned FindStage = 0;
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if (NStages > 0) {
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FindStage = ItinStageMap[ItinStageString];
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if (FindStage == 0) {
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// Emit as { cycles, u1 | u2 | ... | un, timeinc }, // index
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StageTable += ItinStageString + ", // " + itostr(ItinStageEnum) + "\n";
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// Record Itin class number.
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ItinStageMap[ItinStageString] = FindStage = StageCount;
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StageCount += NStages;
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ItinStageEnum++;
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}
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}
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// Check to see if operand cycle already exists and create if it doesn't
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unsigned FindOperandCycle = 0;
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if (NOperandCycles > 0) {
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FindOperandCycle = ItinOperandCycleMap[ItinOperandCycleString];
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if (FindOperandCycle == 0) {
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// Emit as cycle, // index
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OperandCycleTable += ItinOperandCycleString + ", // " +
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itostr(ItinOperandCycleEnum) + "\n";
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// Record Itin class number.
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ItinOperandCycleMap[ItinOperandCycleString] =
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FindOperandCycle = OperandCycleCount;
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OperandCycleCount += NOperandCycles;
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ItinOperandCycleEnum++;
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}
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}
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// Set up itinerary as location and location + stage count
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InstrItinerary Intinerary = { FindStage, FindStage + NStages,
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FindOperandCycle, FindOperandCycle + NOperandCycles};
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// Locate where to inject into processor itinerary table
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const std::string &Name = ItinData->getValueAsDef("TheClass")->getName();
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unsigned Find = ItinClassesMap[Name];
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// Inject - empty slots will be 0, 0
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ItinList[Find] = Intinerary;
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}
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// Add process itinerary to list
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ProcList.push_back(ItinList);
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}
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// Closing stage
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StageTable += " { 0, 0, 0, llvm::InstrStage::Required } // End itinerary\n";
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StageTable += "};\n";
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// Closing operand cycles
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OperandCycleTable += " 0 // End itinerary\n";
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OperandCycleTable += "};\n";
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// Emit tables.
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OS << StageTable;
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OS << OperandCycleTable;
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// Emit size of tables
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OS<<"\nenum {\n";
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OS<<" StagesSize = sizeof(Stages)/sizeof(llvm::InstrStage),\n";
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OS<<" OperandCyclesSize = sizeof(OperandCycles)/sizeof(unsigned)\n";
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OS<<"};\n";
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}
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//
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// EmitProcessorData - Generate data for processor itineraries.
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//
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void SubtargetEmitter::EmitProcessorData(raw_ostream &OS,
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std::vector<std::vector<InstrItinerary> > &ProcList) {
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// Get an iterator for processor itinerary stages
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std::vector<std::vector<InstrItinerary> >::iterator
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ProcListIter = ProcList.begin();
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// For each processor itinerary
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std::vector<Record*> Itins =
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Records.getAllDerivedDefinitions("ProcessorItineraries");
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for (unsigned i = 0, N = Itins.size(); i < N; i++) {
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// Next record
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Record *Itin = Itins[i];
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// Get processor itinerary name
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const std::string &Name = Itin->getName();
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// Skip default
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if (Name == "NoItineraries") continue;
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// Begin processor itinerary table
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OS << "\n";
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OS << "static const llvm::InstrItinerary " << Name << "[] = {\n";
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// For each itinerary class
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std::vector<InstrItinerary> &ItinList = *ProcListIter++;
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for (unsigned j = 0, M = ItinList.size(); j < M; ++j) {
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InstrItinerary &Intinerary = ItinList[j];
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// Emit in the form of
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// { firstStage, lastStage, firstCycle, lastCycle } // index
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if (Intinerary.FirstStage == 0) {
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OS << " { 0, 0, 0, 0 }";
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} else {
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OS << " { " << Intinerary.FirstStage << ", " <<
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Intinerary.LastStage << ", " <<
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Intinerary.FirstOperandCycle << ", " <<
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Intinerary.LastOperandCycle << " }";
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}
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OS << ", // " << j << "\n";
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}
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// End processor itinerary table
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OS << " { ~0U, ~0U, ~0U, ~0U } // end marker\n";
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OS << "};\n";
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}
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}
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//
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// EmitProcessorLookup - generate cpu name to itinerary lookup table.
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//
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void SubtargetEmitter::EmitProcessorLookup(raw_ostream &OS) {
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// Gather and sort processor information
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std::vector<Record*> ProcessorList =
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Records.getAllDerivedDefinitions("Processor");
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std::sort(ProcessorList.begin(), ProcessorList.end(), LessRecordFieldName());
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// Begin processor table
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OS << "\n";
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OS << "// Sorted (by key) array of itineraries for CPU subtype.\n"
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<< "static const llvm::SubtargetInfoKV ProcItinKV[] = {\n";
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// For each processor
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for (unsigned i = 0, N = ProcessorList.size(); i < N;) {
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// Next processor
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Record *Processor = ProcessorList[i];
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const std::string &Name = Processor->getValueAsString("Name");
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const std::string &ProcItin =
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Processor->getValueAsDef("ProcItin")->getName();
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// Emit as { "cpu", procinit },
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OS << " { "
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<< "\"" << Name << "\", "
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<< "(void *)&" << ProcItin;
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OS << " }";
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// Depending on ''if more in the list'' emit comma
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if (++i < N) OS << ",";
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OS << "\n";
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}
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// End processor table
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OS << "};\n";
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// Emit size of table
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OS<<"\nenum {\n";
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OS<<" ProcItinKVSize = sizeof(ProcItinKV)/"
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"sizeof(llvm::SubtargetInfoKV)\n";
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OS<<"};\n";
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}
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//
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// EmitData - Emits all stages and itineries, folding common patterns.
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//
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void SubtargetEmitter::EmitData(raw_ostream &OS) {
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std::map<std::string, unsigned> ItinClassesMap;
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std::vector<std::vector<InstrItinerary> > ProcList;
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// Enumerate all the itinerary classes
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unsigned NItinClasses = CollectAllItinClasses(OS, ItinClassesMap);
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// Make sure the rest is worth the effort
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HasItineraries = NItinClasses != 1; // Ignore NoItinerary.
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if (HasItineraries) {
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// Emit the stage data
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EmitStageAndOperandCycleData(OS, NItinClasses, ItinClassesMap, ProcList);
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// Emit the processor itinerary data
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EmitProcessorData(OS, ProcList);
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// Emit the processor lookup data
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EmitProcessorLookup(OS);
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}
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}
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//
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// ParseFeaturesFunction - Produces a subtarget specific function for parsing
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// the subtarget features string.
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//
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void SubtargetEmitter::ParseFeaturesFunction(raw_ostream &OS) {
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std::vector<Record*> Features =
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Records.getAllDerivedDefinitions("SubtargetFeature");
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std::sort(Features.begin(), Features.end(), LessRecord());
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OS << "// ParseSubtargetFeatures - Parses features string setting specified\n"
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<< "// subtarget options.\n"
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<< "std::string llvm::";
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OS << Target;
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OS << "Subtarget::ParseSubtargetFeatures(const std::string &FS,\n"
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<< " const std::string &CPU) {\n"
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<< " DEBUG(dbgs() << \"\\nFeatures:\" << FS);\n"
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<< " DEBUG(dbgs() << \"\\nCPU:\" << CPU);\n"
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<< " SubtargetFeatures Features(FS);\n"
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<< " Features.setCPUIfNone(CPU);\n"
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<< " uint32_t Bits = Features.getBits(SubTypeKV, SubTypeKVSize,\n"
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<< " FeatureKV, FeatureKVSize);\n";
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for (unsigned i = 0; i < Features.size(); i++) {
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// Next record
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Record *R = Features[i];
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const std::string &Instance = R->getName();
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const std::string &Value = R->getValueAsString("Value");
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const std::string &Attribute = R->getValueAsString("Attribute");
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if (Value=="true" || Value=="false")
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OS << " if ((Bits & " << Instance << ") != 0) "
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<< Attribute << " = " << Value << ";\n";
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else
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OS << " if ((Bits & " << Instance << ") != 0 && " << Attribute <<
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" < " << Value << ") " << Attribute << " = " << Value << ";\n";
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}
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if (HasItineraries) {
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OS << "\n"
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<< " InstrItinerary *Itinerary = (InstrItinerary *)"
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<< "Features.getInfo(ProcItinKV, ProcItinKVSize);\n"
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<< " InstrItins = InstrItineraryData(Stages, OperandCycles, Itinerary);\n";
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}
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OS << " return Features.getCPU();\n"
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<< "}\n";
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}
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//
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// SubtargetEmitter::run - Main subtarget enumeration emitter.
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//
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void SubtargetEmitter::run(raw_ostream &OS) {
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Target = CodeGenTarget().getName();
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EmitSourceFileHeader("Subtarget Enumeration Source Fragment", OS);
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OS << "#include \"llvm/Support/Debug.h\"\n";
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OS << "#include \"llvm/Support/raw_ostream.h\"\n";
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OS << "#include \"llvm/Target/SubtargetFeature.h\"\n";
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OS << "#include \"llvm/Target/TargetInstrItineraries.h\"\n\n";
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// Enumeration(OS, "FuncUnit", true);
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// OS<<"\n";
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// Enumeration(OS, "InstrItinClass", false);
|
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// OS<<"\n";
|
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Enumeration(OS, "SubtargetFeature", true);
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OS<<"\n";
|
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FeatureKeyValues(OS);
|
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OS<<"\n";
|
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CPUKeyValues(OS);
|
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OS<<"\n";
|
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EmitData(OS);
|
|
OS<<"\n";
|
|
ParseFeaturesFunction(OS);
|
|
}
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