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llvm-mirror/utils/TableGen/InstrInfoEmitter.cpp
Evan Cheng 8ea3f4a592 Add instruction flags: hasExtraSrcRegAllocReq and hasExtraDefRegAllocReq. When 
set, these flags indicate the instructions source / def operands have special
register allocation requirement that are not captured in their register classes.
Post-allocation passes (e.g. post-alloc scheduler) should not change their
allocations. e.g. ARM::LDRD require the two definitions to be allocated
even / odd register pair.

llvm-svn: 83196
2009-10-01 08:21:18 +00:00

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//===- InstrInfoEmitter.cpp - Generate a Instruction Set Desc. ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This tablegen backend is responsible for emitting a description of the target
// instruction set for the code generator.
//
//===----------------------------------------------------------------------===//
#include "InstrInfoEmitter.h"
#include "CodeGenTarget.h"
#include "Record.h"
#include "llvm/ADT/StringExtras.h"
#include <algorithm>
using namespace llvm;
static void PrintDefList(const std::vector<Record*> &Uses,
unsigned Num, raw_ostream &OS) {
OS << "static const unsigned ImplicitList" << Num << "[] = { ";
for (unsigned i = 0, e = Uses.size(); i != e; ++i)
OS << getQualifiedName(Uses[i]) << ", ";
OS << "0 };\n";
}
static void PrintBarriers(std::vector<Record*> &Barriers,
unsigned Num, raw_ostream &OS) {
OS << "static const TargetRegisterClass* Barriers" << Num << "[] = { ";
for (unsigned i = 0, e = Barriers.size(); i != e; ++i)
OS << "&" << getQualifiedName(Barriers[i]) << "RegClass, ";
OS << "NULL };\n";
}
//===----------------------------------------------------------------------===//
// Instruction Itinerary Information.
//===----------------------------------------------------------------------===//
struct RecordNameComparator {
bool operator()(const Record *Rec1, const Record *Rec2) const {
return Rec1->getName() < Rec2->getName();
}
};
void InstrInfoEmitter::GatherItinClasses() {
std::vector<Record*> DefList =
Records.getAllDerivedDefinitions("InstrItinClass");
std::sort(DefList.begin(), DefList.end(), RecordNameComparator());
for (unsigned i = 0, N = DefList.size(); i < N; i++)
ItinClassMap[DefList[i]->getName()] = i;
}
unsigned InstrInfoEmitter::getItinClassNumber(const Record *InstRec) {
return ItinClassMap[InstRec->getValueAsDef("Itinerary")->getName()];
}
//===----------------------------------------------------------------------===//
// Operand Info Emission.
//===----------------------------------------------------------------------===//
std::vector<std::string>
InstrInfoEmitter::GetOperandInfo(const CodeGenInstruction &Inst) {
std::vector<std::string> Result;
for (unsigned i = 0, e = Inst.OperandList.size(); i != e; ++i) {
// Handle aggregate operands and normal operands the same way by expanding
// either case into a list of operands for this op.
std::vector<CodeGenInstruction::OperandInfo> OperandList;
// This might be a multiple operand thing. Targets like X86 have
// registers in their multi-operand operands. It may also be an anonymous
// operand, which has a single operand, but no declared class for the
// operand.
DagInit *MIOI = Inst.OperandList[i].MIOperandInfo;
if (!MIOI || MIOI->getNumArgs() == 0) {
// Single, anonymous, operand.
OperandList.push_back(Inst.OperandList[i]);
} else {
for (unsigned j = 0, e = Inst.OperandList[i].MINumOperands; j != e; ++j) {
OperandList.push_back(Inst.OperandList[i]);
Record *OpR = dynamic_cast<DefInit*>(MIOI->getArg(j))->getDef();
OperandList.back().Rec = OpR;
}
}
for (unsigned j = 0, e = OperandList.size(); j != e; ++j) {
Record *OpR = OperandList[j].Rec;
std::string Res;
if (OpR->isSubClassOf("RegisterClass"))
Res += getQualifiedName(OpR) + "RegClassID, ";
else if (OpR->isSubClassOf("PointerLikeRegClass"))
Res += utostr(OpR->getValueAsInt("RegClassKind")) + ", ";
else
Res += "0, ";
// Fill in applicable flags.
Res += "0";
// Ptr value whose register class is resolved via callback.
if (OpR->isSubClassOf("PointerLikeRegClass"))
Res += "|(1<<TOI::LookupPtrRegClass)";
// Predicate operands. Check to see if the original unexpanded operand
// was of type PredicateOperand.
if (Inst.OperandList[i].Rec->isSubClassOf("PredicateOperand"))
Res += "|(1<<TOI::Predicate)";
// Optional def operands. Check to see if the original unexpanded operand
// was of type OptionalDefOperand.
if (Inst.OperandList[i].Rec->isSubClassOf("OptionalDefOperand"))
Res += "|(1<<TOI::OptionalDef)";
// Fill in constraint info.
Res += ", " + Inst.OperandList[i].Constraints[j];
Result.push_back(Res);
}
}
return Result;
}
void InstrInfoEmitter::EmitOperandInfo(raw_ostream &OS,
OperandInfoMapTy &OperandInfoIDs) {
// ID #0 is for no operand info.
unsigned OperandListNum = 0;
OperandInfoIDs[std::vector<std::string>()] = ++OperandListNum;
OS << "\n";
const CodeGenTarget &Target = CDP.getTargetInfo();
for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
E = Target.inst_end(); II != E; ++II) {
std::vector<std::string> OperandInfo = GetOperandInfo(II->second);
unsigned &N = OperandInfoIDs[OperandInfo];
if (N != 0) continue;
N = ++OperandListNum;
OS << "static const TargetOperandInfo OperandInfo" << N << "[] = { ";
for (unsigned i = 0, e = OperandInfo.size(); i != e; ++i)
OS << "{ " << OperandInfo[i] << " }, ";
OS << "};\n";
}
}
void InstrInfoEmitter::DetectRegisterClassBarriers(std::vector<Record*> &Defs,
const std::vector<CodeGenRegisterClass> &RCs,
std::vector<Record*> &Barriers) {
std::set<Record*> DefSet;
unsigned NumDefs = Defs.size();
for (unsigned i = 0; i < NumDefs; ++i)
DefSet.insert(Defs[i]);
for (unsigned i = 0, e = RCs.size(); i != e; ++i) {
const CodeGenRegisterClass &RC = RCs[i];
unsigned NumRegs = RC.Elements.size();
if (NumRegs > NumDefs)
continue; // Can't possibly clobber this RC.
bool Clobber = true;
for (unsigned j = 0; j < NumRegs; ++j) {
Record *Reg = RC.Elements[j];
if (!DefSet.count(Reg)) {
Clobber = false;
break;
}
}
if (Clobber)
Barriers.push_back(RC.TheDef);
}
}
//===----------------------------------------------------------------------===//
// Main Output.
//===----------------------------------------------------------------------===//
// run - Emit the main instruction description records for the target...
void InstrInfoEmitter::run(raw_ostream &OS) {
GatherItinClasses();
EmitSourceFileHeader("Target Instruction Descriptors", OS);
OS << "namespace llvm {\n\n";
CodeGenTarget &Target = CDP.getTargetInfo();
const std::string &TargetName = Target.getName();
Record *InstrInfo = Target.getInstructionSet();
const std::vector<CodeGenRegisterClass> &RCs = Target.getRegisterClasses();
// Keep track of all of the def lists we have emitted already.
std::map<std::vector<Record*>, unsigned> EmittedLists;
unsigned ListNumber = 0;
std::map<std::vector<Record*>, unsigned> EmittedBarriers;
unsigned BarrierNumber = 0;
std::map<Record*, unsigned> BarriersMap;
// Emit all of the instruction's implicit uses and defs.
for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
E = Target.inst_end(); II != E; ++II) {
Record *Inst = II->second.TheDef;
std::vector<Record*> Uses = Inst->getValueAsListOfDefs("Uses");
if (!Uses.empty()) {
unsigned &IL = EmittedLists[Uses];
if (!IL) PrintDefList(Uses, IL = ++ListNumber, OS);
}
std::vector<Record*> Defs = Inst->getValueAsListOfDefs("Defs");
if (!Defs.empty()) {
std::vector<Record*> RCBarriers;
DetectRegisterClassBarriers(Defs, RCs, RCBarriers);
if (!RCBarriers.empty()) {
unsigned &IB = EmittedBarriers[RCBarriers];
if (!IB) PrintBarriers(RCBarriers, IB = ++BarrierNumber, OS);
BarriersMap.insert(std::make_pair(Inst, IB));
}
unsigned &IL = EmittedLists[Defs];
if (!IL) PrintDefList(Defs, IL = ++ListNumber, OS);
}
}
OperandInfoMapTy OperandInfoIDs;
// Emit all of the operand info records.
EmitOperandInfo(OS, OperandInfoIDs);
// Emit all of the TargetInstrDesc records in their ENUM ordering.
//
OS << "\nstatic const TargetInstrDesc " << TargetName
<< "Insts[] = {\n";
std::vector<const CodeGenInstruction*> NumberedInstructions;
Target.getInstructionsByEnumValue(NumberedInstructions);
for (unsigned i = 0, e = NumberedInstructions.size(); i != e; ++i)
emitRecord(*NumberedInstructions[i], i, InstrInfo, EmittedLists,
BarriersMap, OperandInfoIDs, OS);
OS << "};\n";
OS << "} // End llvm namespace \n";
}
void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num,
Record *InstrInfo,
std::map<std::vector<Record*>, unsigned> &EmittedLists,
std::map<Record*, unsigned> &BarriersMap,
const OperandInfoMapTy &OpInfo,
raw_ostream &OS) {
int MinOperands = 0;
if (!Inst.OperandList.empty())
// Each logical operand can be multiple MI operands.
MinOperands = Inst.OperandList.back().MIOperandNo +
Inst.OperandList.back().MINumOperands;
OS << " { ";
OS << Num << ",\t" << MinOperands << ",\t"
<< Inst.NumDefs << ",\t" << getItinClassNumber(Inst.TheDef)
<< ",\t\"" << Inst.TheDef->getName() << "\", 0";
// Emit all of the target indepedent flags...
if (Inst.isReturn) OS << "|(1<<TID::Return)";
if (Inst.isBranch) OS << "|(1<<TID::Branch)";
if (Inst.isIndirectBranch) OS << "|(1<<TID::IndirectBranch)";
if (Inst.isBarrier) OS << "|(1<<TID::Barrier)";
if (Inst.hasDelaySlot) OS << "|(1<<TID::DelaySlot)";
if (Inst.isCall) OS << "|(1<<TID::Call)";
if (Inst.canFoldAsLoad) OS << "|(1<<TID::FoldableAsLoad)";
if (Inst.mayLoad) OS << "|(1<<TID::MayLoad)";
if (Inst.mayStore) OS << "|(1<<TID::MayStore)";
if (Inst.isPredicable) OS << "|(1<<TID::Predicable)";
if (Inst.isConvertibleToThreeAddress) OS << "|(1<<TID::ConvertibleTo3Addr)";
if (Inst.isCommutable) OS << "|(1<<TID::Commutable)";
if (Inst.isTerminator) OS << "|(1<<TID::Terminator)";
if (Inst.isReMaterializable) OS << "|(1<<TID::Rematerializable)";
if (Inst.isNotDuplicable) OS << "|(1<<TID::NotDuplicable)";
if (Inst.hasOptionalDef) OS << "|(1<<TID::HasOptionalDef)";
if (Inst.usesCustomDAGSchedInserter)
OS << "|(1<<TID::UsesCustomDAGSchedInserter)";
if (Inst.isVariadic) OS << "|(1<<TID::Variadic)";
if (Inst.hasSideEffects) OS << "|(1<<TID::UnmodeledSideEffects)";
if (Inst.isAsCheapAsAMove) OS << "|(1<<TID::CheapAsAMove)";
if (Inst.hasExtraSrcRegAllocReq) OS << "|(1<<TID::ExtraSrcRegAllocReq)";
if (Inst.hasExtraDefRegAllocReq) OS << "|(1<<TID::ExtraDefRegAllocReq)";
OS << ", 0";
// Emit all of the target-specific flags...
ListInit *LI = InstrInfo->getValueAsListInit("TSFlagsFields");
ListInit *Shift = InstrInfo->getValueAsListInit("TSFlagsShifts");
if (LI->getSize() != Shift->getSize())
throw "Lengths of " + InstrInfo->getName() +
":(TargetInfoFields, TargetInfoPositions) must be equal!";
for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
emitShiftedValue(Inst.TheDef, dynamic_cast<StringInit*>(LI->getElement(i)),
dynamic_cast<IntInit*>(Shift->getElement(i)), OS);
OS << ", ";
// Emit the implicit uses and defs lists...
std::vector<Record*> UseList = Inst.TheDef->getValueAsListOfDefs("Uses");
if (UseList.empty())
OS << "NULL, ";
else
OS << "ImplicitList" << EmittedLists[UseList] << ", ";
std::vector<Record*> DefList = Inst.TheDef->getValueAsListOfDefs("Defs");
if (DefList.empty())
OS << "NULL, ";
else
OS << "ImplicitList" << EmittedLists[DefList] << ", ";
std::map<Record*, unsigned>::iterator BI = BarriersMap.find(Inst.TheDef);
if (BI == BarriersMap.end())
OS << "NULL, ";
else
OS << "Barriers" << BI->second << ", ";
// Emit the operand info.
std::vector<std::string> OperandInfo = GetOperandInfo(Inst);
if (OperandInfo.empty())
OS << "0";
else
OS << "OperandInfo" << OpInfo.find(OperandInfo)->second;
OS << " }, // Inst #" << Num << " = " << Inst.TheDef->getName() << "\n";
}
void InstrInfoEmitter::emitShiftedValue(Record *R, StringInit *Val,
IntInit *ShiftInt, raw_ostream &OS) {
if (Val == 0 || ShiftInt == 0)
throw std::string("Illegal value or shift amount in TargetInfo*!");
RecordVal *RV = R->getValue(Val->getValue());
int Shift = ShiftInt->getValue();
if (RV == 0 || RV->getValue() == 0) {
// This isn't an error if this is a builtin instruction.
if (R->getName() != "PHI" &&
R->getName() != "INLINEASM" &&
R->getName() != "DBG_LABEL" &&
R->getName() != "EH_LABEL" &&
R->getName() != "GC_LABEL" &&
R->getName() != "KILL" &&
R->getName() != "EXTRACT_SUBREG" &&
R->getName() != "INSERT_SUBREG" &&
R->getName() != "IMPLICIT_DEF" &&
R->getName() != "SUBREG_TO_REG" &&
R->getName() != "COPY_TO_REGCLASS")
throw R->getName() + " doesn't have a field named '" +
Val->getValue() + "'!";
return;
}
Init *Value = RV->getValue();
if (BitInit *BI = dynamic_cast<BitInit*>(Value)) {
if (BI->getValue()) OS << "|(1<<" << Shift << ")";
return;
} else if (BitsInit *BI = dynamic_cast<BitsInit*>(Value)) {
// Convert the Bits to an integer to print...
Init *I = BI->convertInitializerTo(new IntRecTy());
if (I)
if (IntInit *II = dynamic_cast<IntInit*>(I)) {
if (II->getValue()) {
if (Shift)
OS << "|(" << II->getValue() << "<<" << Shift << ")";
else
OS << "|" << II->getValue();
}
return;
}
} else if (IntInit *II = dynamic_cast<IntInit*>(Value)) {
if (II->getValue()) {
if (Shift)
OS << "|(" << II->getValue() << "<<" << Shift << ")";
else
OS << II->getValue();
}
return;
}
errs() << "Unhandled initializer: " << *Val << "\n";
throw "In record '" + R->getName() + "' for TSFlag emission.";
}
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