X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=utils%2FTableGen%2FFastISelEmitter.cpp;h=3ce764259898e39887f7286b812eba9696ec9254;hb=b2a14325079f64debd7df6d5a8ed2037b3128154;hp=ae12201600059832afa88a951692c1c7334ca9ba;hpb=04b7dfb233de210cd1c7d846f9fbde85f6824d5e;p=oota-llvm.git diff --git a/utils/TableGen/FastISelEmitter.cpp b/utils/TableGen/FastISelEmitter.cpp index ae122016000..3ce76425989 100644 --- a/utils/TableGen/FastISelEmitter.cpp +++ b/utils/TableGen/FastISelEmitter.cpp @@ -7,32 +7,14 @@ // //===----------------------------------------------------------------------===// // -// This tablegen backend emits a "fast" instruction selector. +// This tablegen backend emits code for use by the "fast" instruction +// selection algorithm. See the comments at the top of +// lib/CodeGen/SelectionDAG/FastISel.cpp for background. // -// This instruction selection method is designed to emit very poor code -// quickly. Also, it is not designed to do much lowering, so most illegal -// types (e.g. i64 on 32-bit targets) and operations (e.g. calls) are not -// supported and cannot easily be added. Blocks containing operations -// that are not supported need to be handled by a more capable selector, -// such as the SelectionDAG selector. +// This file scans through the target's tablegen instruction-info files +// and extracts instructions with obvious-looking patterns, and it emits +// code to look up these instructions by type and operator. // -// The intended use for "fast" instruction selection is "-O0" mode -// compilation, where the quality of the generated code is irrelevant when -// weighed against the speed at which the code can be generated. -// -// If compile time is so important, you might wonder why we don't just -// skip codegen all-together, emit LLVM bytecode files, and execute them -// with an interpreter. The answer is that it would complicate linking and -// debugging, and also because that isn't how a compiler is expected to -// work in some circles. -// -// If you need better generated code or more lowering than what this -// instruction selector provides, use the SelectionDAG (DAGISel) instruction -// selector instead. If you're looking here because SelectionDAG isn't fast -// enough, consider looking into improving the SelectionDAG infastructure -// instead. At the time of this writing there remain several major -// opportunities for improvement. -// //===----------------------------------------------------------------------===// #include "FastISelEmitter.h" @@ -44,6 +26,16 @@ using namespace llvm; namespace { +/// InstructionMemo - This class holds additional information about an +/// instruction needed to emit code for it. +/// +struct InstructionMemo { + std::string Name; + const CodeGenRegisterClass *RC; + unsigned char SubRegNo; + std::vector* PhysRegs; +}; + /// OperandsSignature - This class holds a description of a list of operand /// types. It has utility methods for emitting text based on the operands. /// @@ -56,10 +48,85 @@ struct OperandsSignature { bool empty() const { return Operands.empty(); } + /// initialize - Examine the given pattern and initialize the contents + /// of the Operands array accordingly. Return true if all the operands + /// are supported, false otherwise. + /// + bool initialize(TreePatternNode *InstPatNode, + const CodeGenTarget &Target, + MVT::SimpleValueType VT) { + if (!InstPatNode->isLeaf() && + InstPatNode->getOperator()->getName() == "imm") { + Operands.push_back("i"); + return true; + } + if (!InstPatNode->isLeaf() && + InstPatNode->getOperator()->getName() == "fpimm") { + Operands.push_back("f"); + return true; + } + + const CodeGenRegisterClass *DstRC = 0; + + for (unsigned i = 0, e = InstPatNode->getNumChildren(); i != e; ++i) { + TreePatternNode *Op = InstPatNode->getChild(i); + // For now, filter out any operand with a predicate. + if (!Op->getPredicateFns().empty()) + return false; + // For now, filter out any operand with multiple values. + if (Op->getExtTypes().size() != 1) + return false; + // For now, all the operands must have the same type. + if (Op->getTypeNum(0) != VT) + return false; + if (!Op->isLeaf()) { + if (Op->getOperator()->getName() == "imm") { + Operands.push_back("i"); + return true; + } + if (Op->getOperator()->getName() == "fpimm") { + Operands.push_back("f"); + return true; + } + // For now, ignore other non-leaf nodes. + return false; + } + DefInit *OpDI = dynamic_cast(Op->getLeafValue()); + if (!OpDI) + return false; + Record *OpLeafRec = OpDI->getDef(); + // For now, the only other thing we accept is register operands. + + const CodeGenRegisterClass *RC = 0; + if (OpLeafRec->isSubClassOf("RegisterClass")) + RC = &Target.getRegisterClass(OpLeafRec); + else if (OpLeafRec->isSubClassOf("Register")) + RC = Target.getRegisterClassForRegister(OpLeafRec); + else + return false; + // For now, require the register operands' register classes to all + // be the same. + if (!RC) + return false; + // For now, all the operands must have the same register class. + if (DstRC) { + if (DstRC != RC) + return false; + } else + DstRC = RC; + Operands.push_back("r"); + } + return true; + } + void PrintParameters(std::ostream &OS) const { for (unsigned i = 0, e = Operands.size(); i != e; ++i) { if (Operands[i] == "r") { OS << "unsigned Op" << i; + } else if (Operands[i] == "i") { + OS << "uint64_t imm" << i; + } else if (Operands[i] == "f") { + OS << "ConstantFP *f" << i; } else { assert("Unknown operand kind!"); abort(); @@ -69,10 +136,41 @@ struct OperandsSignature { } } + void PrintArguments(std::ostream &OS, + const std::vector& PR) const { + assert(PR.size() == Operands.size()); + bool PrintedArg = false; + for (unsigned i = 0, e = Operands.size(); i != e; ++i) { + if (PR[i] != "") + // Implicit physical register operand. + continue; + + if (PrintedArg) + OS << ", "; + if (Operands[i] == "r") { + OS << "Op" << i; + PrintedArg = true; + } else if (Operands[i] == "i") { + OS << "imm" << i; + PrintedArg = true; + } else if (Operands[i] == "f") { + OS << "f" << i; + PrintedArg = true; + } else { + assert("Unknown operand kind!"); + abort(); + } + } + } + void PrintArguments(std::ostream &OS) const { for (unsigned i = 0, e = Operands.size(); i != e; ++i) { if (Operands[i] == "r") { OS << "Op" << i; + } else if (Operands[i] == "i") { + OS << "imm" << i; + } else if (Operands[i] == "f") { + OS << "f" << i; } else { assert("Unknown operand kind!"); abort(); @@ -82,6 +180,21 @@ struct OperandsSignature { } } + + void PrintManglingSuffix(std::ostream &OS, + const std::vector& PR) const { + for (unsigned i = 0, e = Operands.size(); i != e; ++i) { + if (PR[i] != "") + // Implicit physical register operand. e.g. Instruction::Mul expect to + // select to a binary op. On x86, mul may take a single operand with + // the other operand being implicit. We must emit something that looks + // like a binary instruction except for the very inner FastEmitInst_* + // call. + continue; + OS << Operands[i]; + } + } + void PrintManglingSuffix(std::ostream &OS) const { for (unsigned i = 0, e = Operands.size(); i != e; ++i) { OS << Operands[i]; @@ -89,12 +202,23 @@ struct OperandsSignature { } }; -/// InstructionMemo - This class holds additional information about an -/// instruction needed to emit code for it. -/// -struct InstructionMemo { - std::string Name; - const CodeGenRegisterClass *RC; +class FastISelMap { + typedef std::map PredMap; + typedef std::map RetPredMap; + typedef std::map TypeRetPredMap; + typedef std::map OpcodeTypeRetPredMap; + typedef std::map OperandsOpcodeTypeRetPredMap; + + OperandsOpcodeTypeRetPredMap SimplePatterns; + + std::string InstNS; + +public: + explicit FastISelMap(std::string InstNS); + + void CollectPatterns(CodeGenDAGPatterns &CGP); + void PrintClass(std::ostream &OS); + void PrintFunctionDefinitions(std::ostream &OS); }; } @@ -110,45 +234,18 @@ static std::string getLegalCName(std::string OpName) { return OpName; } -void FastISelEmitter::run(std::ostream &OS) { - EmitSourceFileHeader("\"Fast\" Instruction Selector for the " + - CGP.getTargetInfo().getName() + " target", OS); - - const CodeGenTarget &Target = CGP.getTargetInfo(); - - // Get the namespace to insert instructions into. Make sure not to pick up - // "TargetInstrInfo" by accidentally getting the namespace off the PHI - // instruction or something. - std::string InstNS; - for (CodeGenTarget::inst_iterator i = Target.inst_begin(), - e = Target.inst_end(); i != e; ++i) { - InstNS = i->second.Namespace; - if (InstNS != "TargetInstrInfo") - break; - } - - OS << "namespace llvm {\n"; - OS << "namespace " << InstNS << " {\n"; - OS << "class FastISel;\n"; - OS << "}\n"; - OS << "}\n"; - OS << "\n"; - - if (!InstNS.empty()) InstNS += "::"; +FastISelMap::FastISelMap(std::string instns) + : InstNS(instns) { +} - typedef std::map TypeMap; - typedef std::map OpcodeTypeMap; - typedef std::map OperandsOpcodeTypeMap; - OperandsOpcodeTypeMap SimplePatterns; +void FastISelMap::CollectPatterns(CodeGenDAGPatterns &CGP) { + const CodeGenTarget &Target = CGP.getTargetInfo(); - // Create the supported type signatures. - OperandsSignature KnownOperands; - SimplePatterns[KnownOperands] = OpcodeTypeMap(); - KnownOperands.Operands.push_back("r"); - SimplePatterns[KnownOperands] = OpcodeTypeMap(); - KnownOperands.Operands.push_back("r"); - SimplePatterns[KnownOperands] = OpcodeTypeMap(); + // Determine the target's namespace name. + InstNS = Target.getInstNamespace() + "::"; + assert(InstNS.size() > 2 && "Can't determine target-specific namespace!"); + // Scan through all the patterns and record the simple ones. for (CodeGenDAGPatterns::ptm_iterator I = CGP.ptm_begin(), E = CGP.ptm_end(); I != E; ++I) { const PatternToMatch &Pattern = *I; @@ -163,13 +260,37 @@ void FastISelEmitter::run(std::ostream &OS) { CodeGenInstruction &II = CGP.getTargetInfo().getInstruction(Op->getName()); if (II.OperandList.empty()) continue; - Record *Op0Rec = II.OperandList[0].Rec; - if (!Op0Rec->isSubClassOf("RegisterClass")) - continue; - const CodeGenRegisterClass *DstRC = &Target.getRegisterClass(Op0Rec); - if (!DstRC) + + // For now, ignore multi-instruction patterns. + bool MultiInsts = false; + for (unsigned i = 0, e = Dst->getNumChildren(); i != e; ++i) { + TreePatternNode *ChildOp = Dst->getChild(i); + if (ChildOp->isLeaf()) + continue; + if (ChildOp->getOperator()->isSubClassOf("Instruction")) { + MultiInsts = true; + break; + } + } + if (MultiInsts) continue; + // For now, ignore instructions where the first operand is not an + // output register. + const CodeGenRegisterClass *DstRC = 0; + unsigned SubRegNo = ~0; + if (Op->getName() != "EXTRACT_SUBREG") { + Record *Op0Rec = II.OperandList[0].Rec; + if (!Op0Rec->isSubClassOf("RegisterClass")) + continue; + DstRC = &Target.getRegisterClass(Op0Rec); + if (!DstRC) + continue; + } else { + SubRegNo = static_cast( + Dst->getChild(1)->getLeafValue())->getValue(); + } + // Inspect the pattern. TreePatternNode *InstPatNode = Pattern.getSrcPattern(); if (!InstPatNode) continue; @@ -177,155 +298,279 @@ void FastISelEmitter::run(std::ostream &OS) { Record *InstPatOp = InstPatNode->getOperator(); std::string OpcodeName = getOpcodeName(InstPatOp, CGP); - MVT::SimpleValueType VT = InstPatNode->getTypeNum(0); + MVT::SimpleValueType RetVT = InstPatNode->getTypeNum(0); + MVT::SimpleValueType VT = RetVT; + if (InstPatNode->getNumChildren()) + VT = InstPatNode->getChild(0)->getTypeNum(0); // For now, filter out instructions which just set a register to - // an Operand, like MOV32ri. + // an Operand or an immediate, like MOV32ri. if (InstPatOp->isSubClassOf("Operand")) continue; - // Check all the operands. For now only accept register operands. - OperandsSignature Operands; - for (unsigned i = 0, e = InstPatNode->getNumChildren(); i != e; ++i) { - TreePatternNode *Op = InstPatNode->getChild(i); - if (!Op->isLeaf()) - goto continue_label; - DefInit *OpDI = dynamic_cast(Op->getLeafValue()); - if (!OpDI) - goto continue_label; - Record *OpLeafRec = OpDI->getDef(); - if (!OpLeafRec->isSubClassOf("RegisterClass")) - goto continue_label; - const CodeGenRegisterClass *RC = &Target.getRegisterClass(OpLeafRec); - if (!RC) - goto continue_label; - if (Op->getTypeNum(0) != VT) - goto continue_label; - Operands.Operands.push_back("r"); - } - - // If it's not a known signature, ignore it. - if (!SimplePatterns.count(Operands)) + // For now, filter out any instructions with predicates. + if (!InstPatNode->getPredicateFns().empty()) continue; - // Ok, we found a pattern that we can handle. Remember it. - { - InstructionMemo Memo = { Pattern.getDstPattern()->getOperator()->getName(), - DstRC }; - SimplePatterns[Operands][OpcodeName][VT] = Memo; - } - - continue_label:; - } - - OS << "#include \"llvm/CodeGen/FastISel.h\"\n"; - OS << "\n"; - OS << "namespace llvm {\n"; - OS << "\n"; - - // Declare the target FastISel class. - OS << "class " << InstNS << "FastISel : public llvm::FastISel {\n"; - for (OperandsOpcodeTypeMap::const_iterator OI = SimplePatterns.begin(), - OE = SimplePatterns.end(); OI != OE; ++OI) { - const OperandsSignature &Operands = OI->first; - const OpcodeTypeMap &OTM = OI->second; - - for (OpcodeTypeMap::const_iterator I = OTM.begin(), E = OTM.end(); - I != E; ++I) { - const std::string &Opcode = I->first; - const TypeMap &TM = I->second; - - for (TypeMap::const_iterator TI = TM.begin(), TE = TM.end(); - TI != TE; ++TI) { - MVT::SimpleValueType VT = TI->first; - - OS << " unsigned FastEmit_" << getLegalCName(Opcode) - << "_" << getLegalCName(getName(VT)) << "("; - Operands.PrintParameters(OS); - OS << ");\n"; + // Check all the operands. + OperandsSignature Operands; + if (!Operands.initialize(InstPatNode, Target, VT)) + continue; + + std::vector* PhysRegInputs = new std::vector(); + if (!InstPatNode->isLeaf() && + (InstPatNode->getOperator()->getName() == "imm" || + InstPatNode->getOperator()->getName() == "fpimmm")) + PhysRegInputs->push_back(""); + else if (!InstPatNode->isLeaf()) { + for (unsigned i = 0, e = InstPatNode->getNumChildren(); i != e; ++i) { + TreePatternNode *Op = InstPatNode->getChild(i); + if (!Op->isLeaf()) { + PhysRegInputs->push_back(""); + continue; + } + + DefInit *OpDI = dynamic_cast(Op->getLeafValue()); + Record *OpLeafRec = OpDI->getDef(); + std::string PhysReg; + if (OpLeafRec->isSubClassOf("Register")) { + PhysReg += static_cast(OpLeafRec->getValue( \ + "Namespace")->getValue())->getValue(); + PhysReg += "::"; + + std::vector Regs = Target.getRegisters(); + for (unsigned i = 0; i < Regs.size(); ++i) { + if (Regs[i].TheDef == OpLeafRec) { + PhysReg += Regs[i].getName(); + break; + } + } + } + + PhysRegInputs->push_back(PhysReg); } + } else + PhysRegInputs->push_back(""); - OS << " unsigned FastEmit_" << getLegalCName(Opcode) - << "(MVT::SimpleValueType VT"; - if (!Operands.empty()) - OS << ", "; - Operands.PrintParameters(OS); - OS << ");\n"; - } + // Get the predicate that guards this pattern. + std::string PredicateCheck = Pattern.getPredicateCheck(); - OS << "unsigned FastEmit_"; - Operands.PrintManglingSuffix(OS); - OS << "(MVT::SimpleValueType VT, ISD::NodeType Opcode"; - if (!Operands.empty()) - OS << ", "; - Operands.PrintParameters(OS); - OS << ");\n"; + // Ok, we found a pattern that we can handle. Remember it. + InstructionMemo Memo = { + Pattern.getDstPattern()->getOperator()->getName(), + DstRC, + SubRegNo, + PhysRegInputs + }; + assert(!SimplePatterns[Operands][OpcodeName][VT][RetVT].count(PredicateCheck) && + "Duplicate pattern!"); + SimplePatterns[Operands][OpcodeName][VT][RetVT][PredicateCheck] = Memo; } - OS << "public:\n"; - OS << " FastISel(MachineBasicBlock *mbb, MachineFunction *mf, "; - OS << "const TargetInstrInfo *tii) : llvm::FastISel(mbb, mf, tii) {}\n"; - OS << "};\n"; - OS << "\n"; - - // Define the target FastISel creation function. - OS << "llvm::FastISel *" << InstNS - << "createFastISel(MachineBasicBlock *mbb, MachineFunction *mf, "; - OS << "const TargetInstrInfo *tii) {\n"; - OS << " return new " << InstNS << "FastISel(mbb, mf, tii);\n"; - OS << "}\n"; - OS << "\n"; +} +void FastISelMap::PrintFunctionDefinitions(std::ostream &OS) { // Now emit code for all the patterns that we collected. - for (OperandsOpcodeTypeMap::const_iterator OI = SimplePatterns.begin(), + for (OperandsOpcodeTypeRetPredMap::const_iterator OI = SimplePatterns.begin(), OE = SimplePatterns.end(); OI != OE; ++OI) { const OperandsSignature &Operands = OI->first; - const OpcodeTypeMap &OTM = OI->second; + const OpcodeTypeRetPredMap &OTM = OI->second; - for (OpcodeTypeMap::const_iterator I = OTM.begin(), E = OTM.end(); + for (OpcodeTypeRetPredMap::const_iterator I = OTM.begin(), E = OTM.end(); I != E; ++I) { const std::string &Opcode = I->first; - const TypeMap &TM = I->second; + const TypeRetPredMap &TM = I->second; OS << "// FastEmit functions for " << Opcode << ".\n"; OS << "\n"; // Emit one function for each opcode,type pair. - for (TypeMap::const_iterator TI = TM.begin(), TE = TM.end(); + for (TypeRetPredMap::const_iterator TI = TM.begin(), TE = TM.end(); TI != TE; ++TI) { MVT::SimpleValueType VT = TI->first; - const InstructionMemo &Memo = TI->second; + const RetPredMap &RM = TI->second; + if (RM.size() != 1) { + for (RetPredMap::const_iterator RI = RM.begin(), RE = RM.end(); + RI != RE; ++RI) { + MVT::SimpleValueType RetVT = RI->first; + const PredMap &PM = RI->second; + bool HasPred = false; + + OS << "unsigned FastEmit_" + << getLegalCName(Opcode) + << "_" << getLegalCName(getName(VT)) + << "_" << getLegalCName(getName(RetVT)) << "_"; + Operands.PrintManglingSuffix(OS); + OS << "("; + Operands.PrintParameters(OS); + OS << ") {\n"; + + // Emit code for each possible instruction. There may be + // multiple if there are subtarget concerns. + for (PredMap::const_iterator PI = PM.begin(), PE = PM.end(); + PI != PE; ++PI) { + std::string PredicateCheck = PI->first; + const InstructionMemo &Memo = PI->second; - OS << "unsigned " << InstNS << "FastISel::FastEmit_" - << getLegalCName(Opcode) - << "_" << getLegalCName(getName(VT)) << "("; - Operands.PrintParameters(OS); - OS << ") {\n"; - OS << " return FastEmitInst_"; - Operands.PrintManglingSuffix(OS); - OS << "(" << InstNS << Memo.Name << ", "; - OS << InstNS << Memo.RC->getName() << "RegisterClass"; - if (!Operands.empty()) - OS << ", "; - Operands.PrintArguments(OS); - OS << ");\n"; - OS << "}\n"; - OS << "\n"; + if (PredicateCheck.empty()) { + assert(!HasPred && + "Multiple instructions match, at least one has " + "a predicate and at least one doesn't!"); + } else { + OS << " if (" + PredicateCheck + ") {\n"; + OS << " "; + HasPred = true; + } + + for (unsigned i = 0; i < Memo.PhysRegs->size(); ++i) { + if ((*Memo.PhysRegs)[i] != "") + OS << " TII.copyRegToReg(*MBB, MBB->end(), " + << (*Memo.PhysRegs)[i] << ", Op" << i << ", " + << "TM.getRegisterInfo()->getPhysicalRegisterRegClass(" + << (*Memo.PhysRegs)[i] << "), " + << "MRI.getRegClass(Op" << i << "));\n"; + } + + OS << " return FastEmitInst_"; + if (Memo.SubRegNo == (unsigned char)~0) { + Operands.PrintManglingSuffix(OS, *Memo.PhysRegs); + OS << "(" << InstNS << Memo.Name << ", "; + OS << InstNS << Memo.RC->getName() << "RegisterClass"; + if (!Operands.empty()) + OS << ", "; + Operands.PrintArguments(OS, *Memo.PhysRegs); + OS << ");\n"; + } else { + OS << "extractsubreg(Op0, "; + OS << (unsigned)Memo.SubRegNo; + OS << ");\n"; + } + + if (HasPred) + OS << " }\n"; + + } + // Return 0 if none of the predicates were satisfied. + if (HasPred) + OS << " return 0;\n"; + OS << "}\n"; + OS << "\n"; + } + + // Emit one function for the type that demultiplexes on return type. + OS << "unsigned FastEmit_" + << getLegalCName(Opcode) << "_" + << getLegalCName(getName(VT)) << "_"; + Operands.PrintManglingSuffix(OS); + OS << "(MVT::SimpleValueType RetVT"; + if (!Operands.empty()) + OS << ", "; + Operands.PrintParameters(OS); + OS << ") {\nswitch (RetVT) {\n"; + for (RetPredMap::const_iterator RI = RM.begin(), RE = RM.end(); + RI != RE; ++RI) { + MVT::SimpleValueType RetVT = RI->first; + OS << " case " << getName(RetVT) << ": return FastEmit_" + << getLegalCName(Opcode) << "_" << getLegalCName(getName(VT)) + << "_" << getLegalCName(getName(RetVT)) << "_"; + Operands.PrintManglingSuffix(OS); + OS << "("; + Operands.PrintArguments(OS); + OS << ");\n"; + } + OS << " default: return 0;\n}\n}\n\n"; + + } else { + // Non-variadic return type. + OS << "unsigned FastEmit_" + << getLegalCName(Opcode) << "_" + << getLegalCName(getName(VT)) << "_"; + Operands.PrintManglingSuffix(OS); + OS << "(MVT::SimpleValueType RetVT"; + if (!Operands.empty()) + OS << ", "; + Operands.PrintParameters(OS); + OS << ") {\n"; + + OS << " if (RetVT != " << getName(RM.begin()->first) + << ")\n return 0;\n"; + + const PredMap &PM = RM.begin()->second; + bool HasPred = false; + + // Emit code for each possible instruction. There may be + // multiple if there are subtarget concerns. + for (PredMap::const_iterator PI = PM.begin(), PE = PM.end(); PI != PE; + ++PI) { + std::string PredicateCheck = PI->first; + const InstructionMemo &Memo = PI->second; + + if (PredicateCheck.empty()) { + assert(!HasPred && + "Multiple instructions match, at least one has " + "a predicate and at least one doesn't!"); + } else { + OS << " if (" + PredicateCheck + ") {\n"; + OS << " "; + HasPred = true; + } + + for (unsigned i = 0; i < Memo.PhysRegs->size(); ++i) { + if ((*Memo.PhysRegs)[i] != "") + OS << " TII.copyRegToReg(*MBB, MBB->end(), " + << (*Memo.PhysRegs)[i] << ", Op" << i << ", " + << "TM.getRegisterInfo()->getPhysicalRegisterRegClass(" + << (*Memo.PhysRegs)[i] << "), " + << "MRI.getRegClass(Op" << i << "));\n"; + } + + OS << " return FastEmitInst_"; + + if (Memo.SubRegNo == (unsigned char)~0) { + Operands.PrintManglingSuffix(OS, *Memo.PhysRegs); + OS << "(" << InstNS << Memo.Name << ", "; + OS << InstNS << Memo.RC->getName() << "RegisterClass"; + if (!Operands.empty()) + OS << ", "; + Operands.PrintArguments(OS, *Memo.PhysRegs); + OS << ");\n"; + } else { + OS << "extractsubreg(Op0, "; + OS << (unsigned)Memo.SubRegNo; + OS << ");\n"; + } + + if (HasPred) + OS << " }\n"; + } + + // Return 0 if none of the predicates were satisfied. + if (HasPred) + OS << " return 0;\n"; + OS << "}\n"; + OS << "\n"; + } } // Emit one function for the opcode that demultiplexes based on the type. - OS << "unsigned " << InstNS << "FastISel::FastEmit_" - << getLegalCName(Opcode) << "(MVT::SimpleValueType VT"; + OS << "unsigned FastEmit_" + << getLegalCName(Opcode) << "_"; + Operands.PrintManglingSuffix(OS); + OS << "(MVT::SimpleValueType VT, MVT::SimpleValueType RetVT"; if (!Operands.empty()) OS << ", "; Operands.PrintParameters(OS); OS << ") {\n"; OS << " switch (VT) {\n"; - for (TypeMap::const_iterator TI = TM.begin(), TE = TM.end(); + for (TypeRetPredMap::const_iterator TI = TM.begin(), TE = TM.end(); TI != TE; ++TI) { MVT::SimpleValueType VT = TI->first; std::string TypeName = getName(VT); OS << " case " << TypeName << ": return FastEmit_" - << getLegalCName(Opcode) << "_" << getLegalCName(TypeName) << "("; + << getLegalCName(Opcode) << "_" << getLegalCName(TypeName) << "_"; + Operands.PrintManglingSuffix(OS); + OS << "(RetVT"; + if (!Operands.empty()) + OS << ", "; Operands.PrintArguments(OS); OS << ");\n"; } @@ -335,22 +580,27 @@ void FastISelEmitter::run(std::ostream &OS) { OS << "\n"; } + OS << "// Top-level FastEmit function.\n"; + OS << "\n"; + // Emit one function for the operand signature that demultiplexes based // on opcode and type. - OS << "unsigned " << InstNS << "FastISel::FastEmit_"; + OS << "unsigned FastEmit_"; Operands.PrintManglingSuffix(OS); - OS << "(MVT::SimpleValueType VT, ISD::NodeType Opcode"; + OS << "(MVT::SimpleValueType VT, MVT::SimpleValueType RetVT, ISD::NodeType Opcode"; if (!Operands.empty()) OS << ", "; Operands.PrintParameters(OS); OS << ") {\n"; OS << " switch (Opcode) {\n"; - for (OpcodeTypeMap::const_iterator I = OTM.begin(), E = OTM.end(); + for (OpcodeTypeRetPredMap::const_iterator I = OTM.begin(), E = OTM.end(); I != E; ++I) { const std::string &Opcode = I->first; OS << " case " << Opcode << ": return FastEmit_" - << getLegalCName(Opcode) << "(VT"; + << getLegalCName(Opcode) << "_"; + Operands.PrintManglingSuffix(OS); + OS << "(VT, RetVT"; if (!Operands.empty()) OS << ", "; Operands.PrintArguments(OS); @@ -361,8 +611,25 @@ void FastISelEmitter::run(std::ostream &OS) { OS << "}\n"; OS << "\n"; } +} + +void FastISelEmitter::run(std::ostream &OS) { + const CodeGenTarget &Target = CGP.getTargetInfo(); + + // Determine the target's namespace name. + std::string InstNS = Target.getInstNamespace() + "::"; + assert(InstNS.size() > 2 && "Can't determine target-specific namespace!"); + + EmitSourceFileHeader("\"Fast\" Instruction Selector for the " + + Target.getName() + " target", OS); + + FastISelMap F(InstNS); + F.CollectPatterns(CGP); + F.PrintFunctionDefinitions(OS); +} - OS << "}\n"; +FastISelEmitter::FastISelEmitter(RecordKeeper &R) + : Records(R), + CGP(R) { } -// todo: really filter out Constants