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llvm-project/llvm/utils/TableGen/SubtargetEmitter.cpp

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//===- SubtargetEmitter.cpp - Generate subtarget enumerations -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This tablegen backend emits subtarget enumerations.
//
//===----------------------------------------------------------------------===//
#include "SubtargetEmitter.h"
#include "CodeGenTarget.h"
#include "Record.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Debug.h"
#include <algorithm>
using namespace llvm;
//
// Enumeration - Emit the specified class as an enumeration.
//
void SubtargetEmitter::Enumeration(raw_ostream &OS,
const char *ClassName,
bool isBits) {
// Get all records of class and sort
std::vector<Record*> DefList = Records.getAllDerivedDefinitions(ClassName);
std::sort(DefList.begin(), DefList.end(), LessRecord());
// Open enumeration
OS << "enum {\n";
// For each record
unsigned N = DefList.size();
if (N > 64) {
errs() << "Too many (> 64) subtarget features!\n";
exit(1);
}
for (unsigned i = 0; i < N;) {
// Next record
Record *Def = DefList[i];
// Get and emit name
OS << " " << Def->getName();
// If bit flags then emit expression (1 << i)
if (isBits) OS << " = " << " 1ULL << " << i;
// Depending on 'if more in the list' emit comma
if (++i < N) OS << ",";
OS << "\n";
}
// Close enumeration
OS << "};\n";
}
//
// FeatureKeyValues - Emit data of all the subtarget features. Used by the
// command line.
//
void SubtargetEmitter::FeatureKeyValues(raw_ostream &OS) {
// Gather and sort all the features
std::vector<Record*> FeatureList =
Records.getAllDerivedDefinitions("SubtargetFeature");
std::sort(FeatureList.begin(), FeatureList.end(), LessRecordFieldName());
// Begin feature table
OS << "// Sorted (by key) array of values for CPU features.\n"
<< "static const llvm::SubtargetFeatureKV FeatureKV[] = {\n";
// For each feature
for (unsigned i = 0, N = FeatureList.size(); i < N; ++i) {
// Next feature
Record *Feature = FeatureList[i];
const std::string &Name = Feature->getName();
const std::string &CommandLineName = Feature->getValueAsString("Name");
const std::string &Desc = Feature->getValueAsString("Desc");
if (CommandLineName.empty()) continue;
// Emit as { "feature", "description", featureEnum, i1 | i2 | ... | in }
OS << " { "
<< "\"" << CommandLineName << "\", "
<< "\"" << Desc << "\", "
<< Name << ", ";
const std::vector<Record*> &ImpliesList =
Feature->getValueAsListOfDefs("Implies");
if (ImpliesList.empty()) {
OS << "0ULL";
} else {
for (unsigned j = 0, M = ImpliesList.size(); j < M;) {
OS << ImpliesList[j]->getName();
if (++j < M) OS << " | ";
}
}
OS << " }";
// Depending on 'if more in the list' emit comma
if ((i + 1) < N) OS << ",";
OS << "\n";
}
// End feature table
OS << "};\n";
// Emit size of table
OS<<"\nenum {\n";
OS<<" FeatureKVSize = sizeof(FeatureKV)/sizeof(llvm::SubtargetFeatureKV)\n";
OS<<"};\n";
}
//
// CPUKeyValues - Emit data of all the subtarget processors. Used by command
// line.
//
void SubtargetEmitter::CPUKeyValues(raw_ostream &OS) {
// Gather and sort processor information
std::vector<Record*> ProcessorList =
Records.getAllDerivedDefinitions("Processor");
std::sort(ProcessorList.begin(), ProcessorList.end(), LessRecordFieldName());
// Begin processor table
OS << "// Sorted (by key) array of values for CPU subtype.\n"
<< "static const llvm::SubtargetFeatureKV SubTypeKV[] = {\n";
// For each processor
for (unsigned i = 0, N = ProcessorList.size(); i < N;) {
// Next processor
Record *Processor = ProcessorList[i];
const std::string &Name = Processor->getValueAsString("Name");
const std::vector<Record*> &FeatureList =
Processor->getValueAsListOfDefs("Features");
// Emit as { "cpu", "description", f1 | f2 | ... fn },
OS << " { "
<< "\"" << Name << "\", "
<< "\"Select the " << Name << " processor\", ";
if (FeatureList.empty()) {
OS << "0ULL";
} else {
for (unsigned j = 0, M = FeatureList.size(); j < M;) {
OS << FeatureList[j]->getName();
if (++j < M) OS << " | ";
}
}
// The "0" is for the "implies" section of this data structure.
OS << ", 0ULL }";
// Depending on 'if more in the list' emit comma
if (++i < N) OS << ",";
OS << "\n";
}
// End processor table
OS << "};\n";
// Emit size of table
OS<<"\nenum {\n";
OS<<" SubTypeKVSize = sizeof(SubTypeKV)/sizeof(llvm::SubtargetFeatureKV)\n";
OS<<"};\n";
}
//
// CollectAllItinClasses - Gathers and enumerates all the itinerary classes.
// Returns itinerary class count.
//
unsigned SubtargetEmitter::
CollectAllItinClasses(raw_ostream &OS,
std::map<std::string, unsigned> &ItinClassesMap,
std::vector<Record*> &ItinClassList) {
// For each itinerary class
unsigned N = ItinClassList.size();
for (unsigned i = 0; i < N; i++) {
// Next itinerary class
const Record *ItinClass = ItinClassList[i];
// Get name of itinerary class
// Assign itinerary class a unique number
ItinClassesMap[ItinClass->getName()] = i;
}
// Emit size of table
OS<<"\nenum {\n";
OS<<" ItinClassesSize = " << N << "\n";
OS<<"};\n";
// Return itinerary class count
return N;
}
//
// FormItineraryStageString - Compose a string containing the stage
// data initialization for the specified itinerary. N is the number
// of stages.
//
void SubtargetEmitter::FormItineraryStageString(const std::string &Name,
Record *ItinData,
std::string &ItinString,
unsigned &NStages) {
// Get states list
const std::vector<Record*> &StageList =
ItinData->getValueAsListOfDefs("Stages");
// For each stage
unsigned N = NStages = StageList.size();
for (unsigned i = 0; i < N;) {
// Next stage
const Record *Stage = StageList[i];
// Form string as ,{ cycles, u1 | u2 | ... | un, timeinc, kind }
int Cycles = Stage->getValueAsInt("Cycles");
ItinString += " { " + itostr(Cycles) + ", ";
// Get unit list
const std::vector<Record*> &UnitList = Stage->getValueAsListOfDefs("Units");
// For each unit
for (unsigned j = 0, M = UnitList.size(); j < M;) {
// Add name and bitwise or
ItinString += Name + "FU::" + UnitList[j]->getName();
if (++j < M) ItinString += " | ";
}
int TimeInc = Stage->getValueAsInt("TimeInc");
ItinString += ", " + itostr(TimeInc);
int Kind = Stage->getValueAsInt("Kind");
ItinString += ", (llvm::InstrStage::ReservationKinds)" + itostr(Kind);
// Close off stage
ItinString += " }";
if (++i < N) ItinString += ", ";
}
}
//
// FormItineraryOperandCycleString - Compose a string containing the
// operand cycle initialization for the specified itinerary. N is the
// number of operands that has cycles specified.
//
void SubtargetEmitter::FormItineraryOperandCycleString(Record *ItinData,
std::string &ItinString, unsigned &NOperandCycles) {
// Get operand cycle list
const std::vector<int64_t> &OperandCycleList =
ItinData->getValueAsListOfInts("OperandCycles");
// For each operand cycle
unsigned N = NOperandCycles = OperandCycleList.size();
for (unsigned i = 0; i < N;) {
// Next operand cycle
const int OCycle = OperandCycleList[i];
ItinString += " " + itostr(OCycle);
if (++i < N) ItinString += ", ";
}
}
void SubtargetEmitter::FormItineraryBypassString(const std::string &Name,
Record *ItinData,
std::string &ItinString,
unsigned NOperandCycles) {
const std::vector<Record*> &BypassList =
ItinData->getValueAsListOfDefs("Bypasses");
unsigned N = BypassList.size();
unsigned i = 0;
for (; i < N;) {
ItinString += Name + "Bypass::" + BypassList[i]->getName();
if (++i < NOperandCycles) ItinString += ", ";
}
for (; i < NOperandCycles;) {
ItinString += " 0";
if (++i < NOperandCycles) ItinString += ", ";
}
}
//
// EmitStageAndOperandCycleData - Generate unique itinerary stages and
// operand cycle tables. Record itineraries for processors.
//
void SubtargetEmitter::EmitStageAndOperandCycleData(raw_ostream &OS,
unsigned NItinClasses,
std::map<std::string, unsigned> &ItinClassesMap,
std::vector<Record*> &ItinClassList,
std::vector<std::vector<InstrItinerary> > &ProcList) {
// Gather processor iteraries
std::vector<Record*> ProcItinList =
Records.getAllDerivedDefinitions("ProcessorItineraries");
// If just no itinerary then don't bother
if (ProcItinList.size() < 2) return;
// Emit functional units for all the itineraries.
for (unsigned i = 0, N = ProcItinList.size(); i < N; ++i) {
// Next record
Record *Proc = ProcItinList[i];
std::vector<Record*> FUs = Proc->getValueAsListOfDefs("FU");
if (FUs.empty())
continue;
const std::string &Name = Proc->getName();
OS << "\n// Functional units for itineraries \"" << Name << "\"\n"
<< "namespace " << Name << "FU {\n";
for (unsigned j = 0, FUN = FUs.size(); j < FUN; ++j)
OS << " const unsigned " << FUs[j]->getName()
<< " = 1 << " << j << ";\n";
OS << "}\n";
std::vector<Record*> BPs = Proc->getValueAsListOfDefs("BP");
if (BPs.size()) {
OS << "\n// Pipeline forwarding pathes for itineraries \"" << Name
<< "\"\n" << "namespace " << Name << "Bypass {\n";
OS << " const unsigned NoBypass = 0;\n";
for (unsigned j = 0, BPN = BPs.size(); j < BPN; ++j)
OS << " const unsigned " << BPs[j]->getName()
<< " = 1 << " << j << ";\n";
OS << "}\n";
}
}
// Begin stages table
std::string StageTable = "\nstatic const llvm::InstrStage Stages[] = {\n";
StageTable += " { 0, 0, 0, llvm::InstrStage::Required }, // No itinerary\n";
// Begin operand cycle table
std::string OperandCycleTable = "static const unsigned OperandCycles[] = {\n";
OperandCycleTable += " 0, // No itinerary\n";
// Begin pipeline bypass table
std::string BypassTable = "static const unsigned ForwardingPathes[] = {\n";
BypassTable += " 0, // No itinerary\n";
unsigned StageCount = 1, OperandCycleCount = 1;
std::map<std::string, unsigned> ItinStageMap, ItinOperandMap;
for (unsigned i = 0, N = ProcItinList.size(); i < N; i++) {
// Next record
Record *Proc = ProcItinList[i];
// Get processor itinerary name
const std::string &Name = Proc->getName();
// Skip default
if (Name == "NoItineraries") continue;
// Create and expand processor itinerary to cover all itinerary classes
std::vector<InstrItinerary> ItinList;
ItinList.resize(NItinClasses);
// Get itinerary data list
std::vector<Record*> ItinDataList = Proc->getValueAsListOfDefs("IID");
// For each itinerary data
for (unsigned j = 0, M = ItinDataList.size(); j < M; j++) {
// Next itinerary data
Record *ItinData = ItinDataList[j];
// Get string and stage count
std::string ItinStageString;
unsigned NStages;
FormItineraryStageString(Name, ItinData, ItinStageString, NStages);
// Get string and operand cycle count
std::string ItinOperandCycleString;
unsigned NOperandCycles;
FormItineraryOperandCycleString(ItinData, ItinOperandCycleString,
NOperandCycles);
std::string ItinBypassString;
FormItineraryBypassString(Name, ItinData, ItinBypassString,
NOperandCycles);
// Check to see if stage already exists and create if it doesn't
unsigned FindStage = 0;
if (NStages > 0) {
FindStage = ItinStageMap[ItinStageString];
if (FindStage == 0) {
// Emit as { cycles, u1 | u2 | ... | un, timeinc }, // indices
StageTable += ItinStageString + ", // " + itostr(StageCount);
if (NStages > 1)
StageTable += "-" + itostr(StageCount + NStages - 1);
StageTable += "\n";
// Record Itin class number.
ItinStageMap[ItinStageString] = FindStage = StageCount;
StageCount += NStages;
}
}
// Check to see if operand cycle already exists and create if it doesn't
unsigned FindOperandCycle = 0;
if (NOperandCycles > 0) {
std::string ItinOperandString = ItinOperandCycleString+ItinBypassString;
FindOperandCycle = ItinOperandMap[ItinOperandString];
if (FindOperandCycle == 0) {
// Emit as cycle, // index
OperandCycleTable += ItinOperandCycleString + ", // ";
std::string OperandIdxComment = itostr(OperandCycleCount);
if (NOperandCycles > 1)
OperandIdxComment += "-"
+ itostr(OperandCycleCount + NOperandCycles - 1);
OperandCycleTable += OperandIdxComment + "\n";
// Record Itin class number.
ItinOperandMap[ItinOperandCycleString] =
FindOperandCycle = OperandCycleCount;
// Emit as bypass, // index
BypassTable += ItinBypassString + ", // " + OperandIdxComment + "\n";
OperandCycleCount += NOperandCycles;
}
}
// Locate where to inject into processor itinerary table
const std::string &Name = ItinData->getValueAsDef("TheClass")->getName();
unsigned Find = ItinClassesMap[Name];
// Set up itinerary as location and location + stage count
unsigned NumUOps = ItinClassList[Find]->getValueAsInt("NumMicroOps");
InstrItinerary Intinerary = { NumUOps, FindStage, FindStage + NStages,
FindOperandCycle,
FindOperandCycle + NOperandCycles};
// Inject - empty slots will be 0, 0
ItinList[Find] = Intinerary;
}
// Add process itinerary to list
ProcList.push_back(ItinList);
}
// Closing stage
StageTable += " { 0, 0, 0, llvm::InstrStage::Required } // End itinerary\n";
StageTable += "};\n";
// Closing operand cycles
OperandCycleTable += " 0 // End itinerary\n";
OperandCycleTable += "};\n";
BypassTable += " 0 // End itinerary\n";
BypassTable += "};\n";
// Emit tables.
OS << StageTable;
OS << OperandCycleTable;
OS << BypassTable;
// Emit size of tables
OS<<"\nenum {\n";
OS<<" StagesSize = sizeof(Stages)/sizeof(llvm::InstrStage),\n";
OS<<" OperandCyclesSize = sizeof(OperandCycles)/sizeof(unsigned)\n";
OS<<"};\n";
}
//
// EmitProcessorData - Generate data for processor itineraries.
//
void SubtargetEmitter::
EmitProcessorData(raw_ostream &OS,
std::vector<Record*> &ItinClassList,
std::vector<std::vector<InstrItinerary> > &ProcList) {
// Get an iterator for processor itinerary stages
std::vector<std::vector<InstrItinerary> >::iterator
ProcListIter = ProcList.begin();
// For each processor itinerary
std::vector<Record*> Itins =
Records.getAllDerivedDefinitions("ProcessorItineraries");
for (unsigned i = 0, N = Itins.size(); i < N; i++) {
// Next record
Record *Itin = Itins[i];
// Get processor itinerary name
const std::string &Name = Itin->getName();
// Skip default
if (Name == "NoItineraries") continue;
// Begin processor itinerary table
OS << "\n";
OS << "static const llvm::InstrItinerary " << Name << "[] = {\n";
// For each itinerary class
std::vector<InstrItinerary> &ItinList = *ProcListIter++;
assert(ItinList.size() == ItinClassList.size() && "bad itinerary");
for (unsigned j = 0, M = ItinList.size(); j < M; ++j) {
InstrItinerary &Intinerary = ItinList[j];
// Emit in the form of
// { firstStage, lastStage, firstCycle, lastCycle } // index
if (Intinerary.FirstStage == 0) {
OS << " { 1, 0, 0, 0, 0 }";
} else {
OS << " { " <<
Intinerary.NumMicroOps << ", " <<
Intinerary.FirstStage << ", " <<
Intinerary.LastStage << ", " <<
Intinerary.FirstOperandCycle << ", " <<
Intinerary.LastOperandCycle << " }";
}
OS << ", // " << j << " " << ItinClassList[j]->getName() << "\n";
}
// End processor itinerary table
OS << " { 1, ~0U, ~0U, ~0U, ~0U } // end marker\n";
OS << "};\n";
}
}
//
// EmitProcessorLookup - generate cpu name to itinerary lookup table.
//
void SubtargetEmitter::EmitProcessorLookup(raw_ostream &OS) {
// Gather and sort processor information
std::vector<Record*> ProcessorList =
Records.getAllDerivedDefinitions("Processor");
std::sort(ProcessorList.begin(), ProcessorList.end(), LessRecordFieldName());
// Begin processor table
OS << "\n";
OS << "// Sorted (by key) array of itineraries for CPU subtype.\n"
<< "static const llvm::SubtargetInfoKV ProcItinKV[] = {\n";
// For each processor
for (unsigned i = 0, N = ProcessorList.size(); i < N;) {
// Next processor
Record *Processor = ProcessorList[i];
const std::string &Name = Processor->getValueAsString("Name");
const std::string &ProcItin =
Processor->getValueAsDef("ProcItin")->getName();
// Emit as { "cpu", procinit },
OS << " { "
<< "\"" << Name << "\", "
<< "(void *)&" << ProcItin;
OS << " }";
// Depending on ''if more in the list'' emit comma
if (++i < N) OS << ",";
OS << "\n";
}
// End processor table
OS << "};\n";
// Emit size of table
OS<<"\nenum {\n";
OS<<" ProcItinKVSize = sizeof(ProcItinKV)/"
"sizeof(llvm::SubtargetInfoKV)\n";
OS<<"};\n";
}
//
// EmitData - Emits all stages and itineries, folding common patterns.
//
void SubtargetEmitter::EmitData(raw_ostream &OS) {
std::map<std::string, unsigned> ItinClassesMap;
// Gather and sort all itinerary classes
std::vector<Record*> ItinClassList =
Records.getAllDerivedDefinitions("InstrItinClass");
std::sort(ItinClassList.begin(), ItinClassList.end(), LessRecord());
// Enumerate all the itinerary classes
unsigned NItinClasses = CollectAllItinClasses(OS, ItinClassesMap,
ItinClassList);
// Make sure the rest is worth the effort
HasItineraries = NItinClasses != 1; // Ignore NoItinerary.
if (HasItineraries) {
std::vector<std::vector<InstrItinerary> > ProcList;
// Emit the stage data
EmitStageAndOperandCycleData(OS, NItinClasses, ItinClassesMap,
ItinClassList, ProcList);
// Emit the processor itinerary data
EmitProcessorData(OS, ItinClassList, ProcList);
// Emit the processor lookup data
EmitProcessorLookup(OS);
}
}
//
// ParseFeaturesFunction - Produces a subtarget specific function for parsing
// the subtarget features string.
//
void SubtargetEmitter::ParseFeaturesFunction(raw_ostream &OS) {
std::vector<Record*> Features =
Records.getAllDerivedDefinitions("SubtargetFeature");
std::sort(Features.begin(), Features.end(), LessRecord());
OS << "// ParseSubtargetFeatures - Parses features string setting specified\n"
<< "// subtarget options.\n"
<< "std::string llvm::";
OS << Target;
OS << "Subtarget::ParseSubtargetFeatures(const std::string &FS,\n"
<< " const std::string &CPU) {\n"
<< " DEBUG(dbgs() << \"\\nFeatures:\" << FS);\n"
<< " DEBUG(dbgs() << \"\\nCPU:\" << CPU);\n"
<< " SubtargetFeatures Features(FS);\n"
<< " Features.setCPUIfNone(CPU);\n"
<< " uint64_t Bits = Features.getBits(SubTypeKV, SubTypeKVSize,\n"
<< " FeatureKV, FeatureKVSize);\n";
for (unsigned i = 0; i < Features.size(); i++) {
// Next record
Record *R = Features[i];
const std::string &Instance = R->getName();
const std::string &Value = R->getValueAsString("Value");
const std::string &Attribute = R->getValueAsString("Attribute");
if (Value=="true" || Value=="false")
OS << " if ((Bits & " << Instance << ") != 0) "
<< Attribute << " = " << Value << ";\n";
else
OS << " if ((Bits & " << Instance << ") != 0 && " << Attribute <<
" < " << Value << ") " << Attribute << " = " << Value << ";\n";
}
if (HasItineraries) {
OS << "\n"
<< " InstrItinerary *Itinerary = (InstrItinerary *)"
<< "Features.getInfo(ProcItinKV, ProcItinKVSize);\n"
<< " InstrItins = InstrItineraryData(Stages, OperandCycles, "
<< "ForwardingPathes, Itinerary);\n";
}
OS << " return Features.getCPU();\n"
<< "}\n";
}
//
// SubtargetEmitter::run - Main subtarget enumeration emitter.
//
void SubtargetEmitter::run(raw_ostream &OS) {
Target = CodeGenTarget(Records).getName();
EmitSourceFileHeader("Subtarget Enumeration Source Fragment", OS);
OS << "#include \"llvm/Support/Debug.h\"\n";
OS << "#include \"llvm/Support/raw_ostream.h\"\n";
OS << "#include \"llvm/Target/SubtargetFeature.h\"\n";
OS << "#include \"llvm/Target/TargetInstrItineraries.h\"\n\n";
// Enumeration(OS, "FuncUnit", true);
// OS<<"\n";
// Enumeration(OS, "InstrItinClass", false);
// OS<<"\n";
Enumeration(OS, "SubtargetFeature", true);
OS<<"\n";
FeatureKeyValues(OS);
OS<<"\n";
CPUKeyValues(OS);
OS<<"\n";
EmitData(OS);
OS<<"\n";
ParseFeaturesFunction(OS);
}
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