| //===- RISCVCompressInstEmitter.cpp - Generator for RISCV Compression -===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| // RISCVCompressInstEmitter implements a tablegen-driven CompressPat based |
| // RISCV Instruction Compression mechanism. |
| // |
| //===--------------------------------------------------------------===// |
| // |
| // RISCVCompressInstEmitter implements a tablegen-driven CompressPat Instruction |
| // Compression mechanism for generating RISCV compressed instructions |
| // (C ISA Extension) from the expanded instruction form. |
| |
| // This tablegen backend processes CompressPat declarations in a |
| // td file and generates all the required checks to validate the pattern |
| // declarations; validate the input and output operands to generate the correct |
| // compressed instructions. The checks include validating different types of |
| // operands; register operands, immediate operands, fixed register and fixed |
| // immediate inputs. |
| // |
| // Example: |
| // class CompressPat<dag input, dag output> { |
| // dag Input = input; |
| // dag Output = output; |
| // list<Predicate> Predicates = []; |
| // } |
| // |
| // let Predicates = [HasStdExtC] in { |
| // def : CompressPat<(ADD GPRNoX0:$rs1, GPRNoX0:$rs1, GPRNoX0:$rs2), |
| // (C_ADD GPRNoX0:$rs1, GPRNoX0:$rs2)>; |
| // } |
| // |
| // The result is an auto-generated header file |
| // 'RISCVGenCompressInstEmitter.inc' which exports two functions for |
| // compressing/uncompressing MCInst instructions, plus |
| // some helper functions: |
| // |
| // bool compressInst(MCInst& OutInst, const MCInst &MI, |
| // const MCSubtargetInfo &STI, |
| // MCContext &Context); |
| // |
| // bool uncompressInst(MCInst& OutInst, const MCInst &MI, |
| // const MCRegisterInfo &MRI, |
| // const MCSubtargetInfo &STI); |
| // |
| // The clients that include this auto-generated header file and |
| // invoke these functions can compress an instruction before emitting |
| // it in the target-specific ASM or ELF streamer or can uncompress |
| // an instruction before printing it when the expanded instruction |
| // format aliases is favored. |
| |
| //===----------------------------------------------------------------------===// |
| |
| #include "CodeGenInstruction.h" |
| #include "CodeGenTarget.h" |
| #include "llvm/ADT/IndexedMap.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/ADT/StringMap.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/TableGen/Error.h" |
| #include "llvm/TableGen/Record.h" |
| #include "llvm/TableGen/TableGenBackend.h" |
| #include <vector> |
| using namespace llvm; |
| |
| #define DEBUG_TYPE "compress-inst-emitter" |
| |
| namespace { |
| class RISCVCompressInstEmitter { |
| struct OpData { |
| enum MapKind { Operand, Imm, Reg }; |
| MapKind Kind; |
| union { |
| unsigned Operand; // Operand number mapped to. |
| uint64_t Imm; // Integer immediate value. |
| Record *Reg; // Physical register. |
| } Data; |
| int TiedOpIdx = -1; // Tied operand index within the instruction. |
| }; |
| struct CompressPat { |
| CodeGenInstruction Source; // The source instruction definition. |
| CodeGenInstruction Dest; // The destination instruction to transform to. |
| std::vector<Record *> |
| PatReqFeatures; // Required target features to enable pattern. |
| IndexedMap<OpData> |
| SourceOperandMap; // Maps operands in the Source Instruction to |
| // the corresponding Dest instruction operand. |
| IndexedMap<OpData> |
| DestOperandMap; // Maps operands in the Dest Instruction |
| // to the corresponding Source instruction operand. |
| CompressPat(CodeGenInstruction &S, CodeGenInstruction &D, |
| std::vector<Record *> RF, IndexedMap<OpData> &SourceMap, |
| IndexedMap<OpData> &DestMap) |
| : Source(S), Dest(D), PatReqFeatures(RF), SourceOperandMap(SourceMap), |
| DestOperandMap(DestMap) {} |
| }; |
| |
| RecordKeeper &Records; |
| CodeGenTarget Target; |
| SmallVector<CompressPat, 4> CompressPatterns; |
| |
| void addDagOperandMapping(Record *Rec, DagInit *Dag, CodeGenInstruction &Inst, |
| IndexedMap<OpData> &OperandMap, bool IsSourceInst); |
| void evaluateCompressPat(Record *Compress); |
| void emitCompressInstEmitter(raw_ostream &o, bool Compress); |
| bool validateTypes(Record *SubType, Record *Type, bool IsSourceInst); |
| bool validateRegister(Record *Reg, Record *RegClass); |
| void createDagOperandMapping(Record *Rec, StringMap<unsigned> &SourceOperands, |
| StringMap<unsigned> &DestOperands, |
| DagInit *SourceDag, DagInit *DestDag, |
| IndexedMap<OpData> &SourceOperandMap); |
| |
| void createInstOperandMapping(Record *Rec, DagInit *SourceDag, |
| DagInit *DestDag, |
| IndexedMap<OpData> &SourceOperandMap, |
| IndexedMap<OpData> &DestOperandMap, |
| StringMap<unsigned> &SourceOperands, |
| CodeGenInstruction &DestInst); |
| |
| public: |
| RISCVCompressInstEmitter(RecordKeeper &R) : Records(R), Target(R) {} |
| |
| void run(raw_ostream &o); |
| }; |
| } // End anonymous namespace. |
| |
| bool RISCVCompressInstEmitter::validateRegister(Record *Reg, Record *RegClass) { |
| assert(Reg->isSubClassOf("Register") && "Reg record should be a Register\n"); |
| assert(RegClass->isSubClassOf("RegisterClass") && "RegClass record should be" |
| " a RegisterClass\n"); |
| CodeGenRegisterClass RC = Target.getRegisterClass(RegClass); |
| const CodeGenRegister *R = Target.getRegisterByName(Reg->getName().lower()); |
| assert((R != nullptr) && |
| ("Register" + Reg->getName().str() + " not defined!!\n").c_str()); |
| return RC.contains(R); |
| } |
| |
| bool RISCVCompressInstEmitter::validateTypes(Record *DagOpType, |
| Record *InstOpType, |
| bool IsSourceInst) { |
| if (DagOpType == InstOpType) |
| return true; |
| // Only source instruction operands are allowed to not match Input Dag |
| // operands. |
| if (!IsSourceInst) |
| return false; |
| |
| if (DagOpType->isSubClassOf("RegisterClass") && |
| InstOpType->isSubClassOf("RegisterClass")) { |
| CodeGenRegisterClass RC = Target.getRegisterClass(InstOpType); |
| CodeGenRegisterClass SubRC = Target.getRegisterClass(DagOpType); |
| return RC.hasSubClass(&SubRC); |
| } |
| |
| // At this point either or both types are not registers, reject the pattern. |
| if (DagOpType->isSubClassOf("RegisterClass") || |
| InstOpType->isSubClassOf("RegisterClass")) |
| return false; |
| |
| // Let further validation happen when compress()/uncompress() functions are |
| // invoked. |
| LLVM_DEBUG(dbgs() << (IsSourceInst ? "Input" : "Output") |
| << " Dag Operand Type: '" << DagOpType->getName() |
| << "' and " |
| << "Instruction Operand Type: '" << InstOpType->getName() |
| << "' can't be checked at pattern validation time!\n"); |
| return true; |
| } |
| |
| /// The patterns in the Dag contain different types of operands: |
| /// Register operands, e.g.: GPRC:$rs1; Fixed registers, e.g: X1; Immediate |
| /// operands, e.g.: simm6:$imm; Fixed immediate operands, e.g.: 0. This function |
| /// maps Dag operands to its corresponding instruction operands. For register |
| /// operands and fixed registers it expects the Dag operand type to be contained |
| /// in the instantiated instruction operand type. For immediate operands and |
| /// immediates no validation checks are enforced at pattern validation time. |
| void RISCVCompressInstEmitter::addDagOperandMapping( |
| Record *Rec, DagInit *Dag, CodeGenInstruction &Inst, |
| IndexedMap<OpData> &OperandMap, bool IsSourceInst) { |
| // TiedCount keeps track of the number of operands skipped in Inst |
| // operands list to get to the corresponding Dag operand. This is |
| // necessary because the number of operands in Inst might be greater |
| // than number of operands in the Dag due to how tied operands |
| // are represented. |
| unsigned TiedCount = 0; |
| for (unsigned i = 0, e = Inst.Operands.size(); i != e; ++i) { |
| int TiedOpIdx = Inst.Operands[i].getTiedRegister(); |
| if (-1 != TiedOpIdx) { |
| // Set the entry in OperandMap for the tied operand we're skipping. |
| OperandMap[i].Kind = OperandMap[TiedOpIdx].Kind; |
| OperandMap[i].Data = OperandMap[TiedOpIdx].Data; |
| TiedCount++; |
| continue; |
| } |
| if (DefInit *DI = dyn_cast<DefInit>(Dag->getArg(i - TiedCount))) { |
| if (DI->getDef()->isSubClassOf("Register")) { |
| // Check if the fixed register belongs to the Register class. |
| if (!validateRegister(DI->getDef(), Inst.Operands[i].Rec)) |
| PrintFatalError(Rec->getLoc(), |
| "Error in Dag '" + Dag->getAsString() + |
| "'Register: '" + DI->getDef()->getName() + |
| "' is not in register class '" + |
| Inst.Operands[i].Rec->getName() + "'"); |
| OperandMap[i].Kind = OpData::Reg; |
| OperandMap[i].Data.Reg = DI->getDef(); |
| continue; |
| } |
| // Validate that Dag operand type matches the type defined in the |
| // corresponding instruction. Operands in the input Dag pattern are |
| // allowed to be a subclass of the type specified in corresponding |
| // instruction operand instead of being an exact match. |
| if (!validateTypes(DI->getDef(), Inst.Operands[i].Rec, IsSourceInst)) |
| PrintFatalError(Rec->getLoc(), |
| "Error in Dag '" + Dag->getAsString() + "'. Operand '" + |
| Dag->getArgNameStr(i - TiedCount) + "' has type '" + |
| DI->getDef()->getName() + |
| "' which does not match the type '" + |
| Inst.Operands[i].Rec->getName() + |
| "' in the corresponding instruction operand!"); |
| |
| OperandMap[i].Kind = OpData::Operand; |
| } else if (IntInit *II = dyn_cast<IntInit>(Dag->getArg(i - TiedCount))) { |
| // Validate that corresponding instruction operand expects an immediate. |
| if (Inst.Operands[i].Rec->isSubClassOf("RegisterClass")) |
| PrintFatalError( |
| Rec->getLoc(), |
| ("Error in Dag '" + Dag->getAsString() + "' Found immediate: '" + |
| II->getAsString() + |
| "' but corresponding instruction operand expected a register!")); |
| // No pattern validation check possible for values of fixed immediate. |
| OperandMap[i].Kind = OpData::Imm; |
| OperandMap[i].Data.Imm = II->getValue(); |
| LLVM_DEBUG( |
| dbgs() << " Found immediate '" << II->getValue() << "' at " |
| << (IsSourceInst ? "input " : "output ") |
| << "Dag. No validation time check possible for values of " |
| "fixed immediate.\n"); |
| } else |
| llvm_unreachable("Unhandled CompressPat argument type!"); |
| } |
| } |
| |
| // Verify the Dag operand count is enough to build an instruction. |
| static bool verifyDagOpCount(CodeGenInstruction &Inst, DagInit *Dag, |
| bool IsSource) { |
| if (Dag->getNumArgs() == Inst.Operands.size()) |
| return true; |
| // Source instructions are non compressed instructions and don't have tied |
| // operands. |
| if (IsSource) |
| PrintFatalError(Inst.TheDef->getLoc(), |
| "Input operands for Inst '" + Inst.TheDef->getName() + |
| "' and input Dag operand count mismatch"); |
| // The Dag can't have more arguments than the Instruction. |
| if (Dag->getNumArgs() > Inst.Operands.size()) |
| PrintFatalError(Inst.TheDef->getLoc(), |
| "Inst '" + Inst.TheDef->getName() + |
| "' and Dag operand count mismatch"); |
| |
| // The Instruction might have tied operands so the Dag might have |
| // a fewer operand count. |
| unsigned RealCount = Inst.Operands.size(); |
| for (unsigned i = 0; i < Inst.Operands.size(); i++) |
| if (Inst.Operands[i].getTiedRegister() != -1) |
| --RealCount; |
| |
| if (Dag->getNumArgs() != RealCount) |
| PrintFatalError(Inst.TheDef->getLoc(), |
| "Inst '" + Inst.TheDef->getName() + |
| "' and Dag operand count mismatch"); |
| return true; |
| } |
| |
| static bool validateArgsTypes(Init *Arg1, Init *Arg2) { |
| DefInit *Type1 = dyn_cast<DefInit>(Arg1); |
| DefInit *Type2 = dyn_cast<DefInit>(Arg2); |
| assert(Type1 && ("Arg1 type not found\n")); |
| assert(Type2 && ("Arg2 type not found\n")); |
| return Type1->getDef() == Type2->getDef(); |
| } |
| |
| // Creates a mapping between the operand name in the Dag (e.g. $rs1) and |
| // its index in the list of Dag operands and checks that operands with the same |
| // name have the same types. For example in 'C_ADD $rs1, $rs2' we generate the |
| // mapping $rs1 --> 0, $rs2 ---> 1. If the operand appears twice in the (tied) |
| // same Dag we use the last occurrence for indexing. |
| void RISCVCompressInstEmitter::createDagOperandMapping( |
| Record *Rec, StringMap<unsigned> &SourceOperands, |
| StringMap<unsigned> &DestOperands, DagInit *SourceDag, DagInit *DestDag, |
| IndexedMap<OpData> &SourceOperandMap) { |
| for (unsigned i = 0; i < DestDag->getNumArgs(); ++i) { |
| // Skip fixed immediates and registers, they were handled in |
| // addDagOperandMapping. |
| if ("" == DestDag->getArgNameStr(i)) |
| continue; |
| DestOperands[DestDag->getArgNameStr(i)] = i; |
| } |
| |
| for (unsigned i = 0; i < SourceDag->getNumArgs(); ++i) { |
| // Skip fixed immediates and registers, they were handled in |
| // addDagOperandMapping. |
| if ("" == SourceDag->getArgNameStr(i)) |
| continue; |
| |
| StringMap<unsigned>::iterator it = |
| SourceOperands.find(SourceDag->getArgNameStr(i)); |
| if (it != SourceOperands.end()) { |
| // Operand sharing the same name in the Dag should be mapped as tied. |
| SourceOperandMap[i].TiedOpIdx = it->getValue(); |
| if (!validateArgsTypes(SourceDag->getArg(it->getValue()), |
| SourceDag->getArg(i))) |
| PrintFatalError(Rec->getLoc(), |
| "Input Operand '" + SourceDag->getArgNameStr(i) + |
| "' has a mismatched tied operand!\n"); |
| } |
| it = DestOperands.find(SourceDag->getArgNameStr(i)); |
| if (it == DestOperands.end()) |
| PrintFatalError(Rec->getLoc(), "Operand " + SourceDag->getArgNameStr(i) + |
| " defined in Input Dag but not used in" |
| " Output Dag!\n"); |
| // Input Dag operand types must match output Dag operand type. |
| if (!validateArgsTypes(DestDag->getArg(it->getValue()), |
| SourceDag->getArg(i))) |
| PrintFatalError(Rec->getLoc(), "Type mismatch between Input and " |
| "Output Dag operand '" + |
| SourceDag->getArgNameStr(i) + "'!"); |
| SourceOperands[SourceDag->getArgNameStr(i)] = i; |
| } |
| } |
| |
| /// Map operand names in the Dag to their index in both corresponding input and |
| /// output instructions. Validate that operands defined in the input are |
| /// used in the output pattern while populating the maps. |
| void RISCVCompressInstEmitter::createInstOperandMapping( |
| Record *Rec, DagInit *SourceDag, DagInit *DestDag, |
| IndexedMap<OpData> &SourceOperandMap, IndexedMap<OpData> &DestOperandMap, |
| StringMap<unsigned> &SourceOperands, CodeGenInstruction &DestInst) { |
| // TiedCount keeps track of the number of operands skipped in Inst |
| // operands list to get to the corresponding Dag operand. |
| unsigned TiedCount = 0; |
| LLVM_DEBUG(dbgs() << " Operand mapping:\n Source Dest\n"); |
| for (unsigned i = 0, e = DestInst.Operands.size(); i != e; ++i) { |
| int TiedInstOpIdx = DestInst.Operands[i].getTiedRegister(); |
| if (TiedInstOpIdx != -1) { |
| ++TiedCount; |
| DestOperandMap[i].Data = DestOperandMap[TiedInstOpIdx].Data; |
| DestOperandMap[i].Kind = DestOperandMap[TiedInstOpIdx].Kind; |
| if (DestOperandMap[i].Kind == OpData::Operand) |
| // No need to fill the SourceOperandMap here since it was mapped to |
| // destination operand 'TiedInstOpIdx' in a previous iteration. |
| LLVM_DEBUG(dbgs() << " " << DestOperandMap[i].Data.Operand |
| << " ====> " << i |
| << " Dest operand tied with operand '" |
| << TiedInstOpIdx << "'\n"); |
| continue; |
| } |
| // Skip fixed immediates and registers, they were handled in |
| // addDagOperandMapping. |
| if (DestOperandMap[i].Kind != OpData::Operand) |
| continue; |
| |
| unsigned DagArgIdx = i - TiedCount; |
| StringMap<unsigned>::iterator SourceOp = |
| SourceOperands.find(DestDag->getArgNameStr(DagArgIdx)); |
| if (SourceOp == SourceOperands.end()) |
| PrintFatalError(Rec->getLoc(), |
| "Output Dag operand '" + |
| DestDag->getArgNameStr(DagArgIdx) + |
| "' has no matching input Dag operand."); |
| |
| assert(DestDag->getArgNameStr(DagArgIdx) == |
| SourceDag->getArgNameStr(SourceOp->getValue()) && |
| "Incorrect operand mapping detected!\n"); |
| DestOperandMap[i].Data.Operand = SourceOp->getValue(); |
| SourceOperandMap[SourceOp->getValue()].Data.Operand = i; |
| LLVM_DEBUG(dbgs() << " " << SourceOp->getValue() << " ====> " << i |
| << "\n"); |
| } |
| } |
| |
| /// Validates the CompressPattern and create operand mapping. |
| /// These are the checks to validate a CompressPat pattern declarations. |
| /// Error out with message under these conditions: |
| /// - Dag Input opcode is an expanded instruction and Dag Output opcode is a |
| /// compressed instruction. |
| /// - Operands in Dag Input must be all used in Dag Output. |
| /// Register Operand type in Dag Input Type must be contained in the |
| /// corresponding Source Instruction type. |
| /// - Register Operand type in Dag Input must be the same as in Dag Ouput. |
| /// - Register Operand type in Dag Output must be the same as the |
| /// corresponding Destination Inst type. |
| /// - Immediate Operand type in Dag Input must be the same as in Dag Ouput. |
| /// - Immediate Operand type in Dag Ouput must be the same as the corresponding |
| /// Destination Instruction type. |
| /// - Fixed register must be contained in the corresponding Source Instruction |
| /// type. |
| /// - Fixed register must be contained in the corresponding Destination |
| /// Instruction type. Warning message printed under these conditions: |
| /// - Fixed immediate in Dag Input or Dag Ouput cannot be checked at this time |
| /// and generate warning. |
| /// - Immediate operand type in Dag Input differs from the corresponding Source |
| /// Instruction type and generate a warning. |
| void RISCVCompressInstEmitter::evaluateCompressPat(Record *Rec) { |
| // Validate input Dag operands. |
| DagInit *SourceDag = Rec->getValueAsDag("Input"); |
| assert(SourceDag && "Missing 'Input' in compress pattern!"); |
| LLVM_DEBUG(dbgs() << "Input: " << *SourceDag << "\n"); |
| |
| DefInit *OpDef = dyn_cast<DefInit>(SourceDag->getOperator()); |
| if (!OpDef) |
| PrintFatalError(Rec->getLoc(), |
| Rec->getName() + " has unexpected operator type!"); |
| // Checking we are transforming from compressed to uncompressed instructions. |
| Record *Operator = OpDef->getDef(); |
| if (!Operator->isSubClassOf("RVInst")) |
| PrintFatalError(Rec->getLoc(), "Input instruction '" + Operator->getName() + |
| "' is not a 32 bit wide instruction!"); |
| CodeGenInstruction SourceInst(Operator); |
| verifyDagOpCount(SourceInst, SourceDag, true); |
| |
| // Validate output Dag operands. |
| DagInit *DestDag = Rec->getValueAsDag("Output"); |
| assert(DestDag && "Missing 'Output' in compress pattern!"); |
| LLVM_DEBUG(dbgs() << "Output: " << *DestDag << "\n"); |
| |
| DefInit *DestOpDef = dyn_cast<DefInit>(DestDag->getOperator()); |
| if (!DestOpDef) |
| PrintFatalError(Rec->getLoc(), |
| Rec->getName() + " has unexpected operator type!"); |
| |
| Record *DestOperator = DestOpDef->getDef(); |
| if (!DestOperator->isSubClassOf("RVInst16")) |
| PrintFatalError(Rec->getLoc(), "Output instruction '" + |
| DestOperator->getName() + |
| "' is not a 16 bit wide instruction!"); |
| CodeGenInstruction DestInst(DestOperator); |
| verifyDagOpCount(DestInst, DestDag, false); |
| |
| // Fill the mapping from the source to destination instructions. |
| |
| IndexedMap<OpData> SourceOperandMap; |
| SourceOperandMap.grow(SourceInst.Operands.size()); |
| // Create a mapping between source Dag operands and source Inst operands. |
| addDagOperandMapping(Rec, SourceDag, SourceInst, SourceOperandMap, |
| /*IsSourceInst*/ true); |
| |
| IndexedMap<OpData> DestOperandMap; |
| DestOperandMap.grow(DestInst.Operands.size()); |
| // Create a mapping between destination Dag operands and destination Inst |
| // operands. |
| addDagOperandMapping(Rec, DestDag, DestInst, DestOperandMap, |
| /*IsSourceInst*/ false); |
| |
| StringMap<unsigned> SourceOperands; |
| StringMap<unsigned> DestOperands; |
| createDagOperandMapping(Rec, SourceOperands, DestOperands, SourceDag, DestDag, |
| SourceOperandMap); |
| // Create operand mapping between the source and destination instructions. |
| createInstOperandMapping(Rec, SourceDag, DestDag, SourceOperandMap, |
| DestOperandMap, SourceOperands, DestInst); |
| |
| // Get the target features for the CompressPat. |
| std::vector<Record *> PatReqFeatures; |
| std::vector<Record *> RF = Rec->getValueAsListOfDefs("Predicates"); |
| copy_if(RF, std::back_inserter(PatReqFeatures), [](Record *R) { |
| return R->getValueAsBit("AssemblerMatcherPredicate"); |
| }); |
| |
| CompressPatterns.push_back(CompressPat(SourceInst, DestInst, PatReqFeatures, |
| SourceOperandMap, DestOperandMap)); |
| } |
| |
| static void getReqFeatures(std::map<StringRef, int> &FeaturesMap, |
| const std::vector<Record *> &ReqFeatures) { |
| for (auto &R : ReqFeatures) { |
| StringRef AsmCondString = R->getValueAsString("AssemblerCondString"); |
| |
| // AsmCondString has syntax [!]F(,[!]F)* |
| SmallVector<StringRef, 4> Ops; |
| SplitString(AsmCondString, Ops, ","); |
| assert(!Ops.empty() && "AssemblerCondString cannot be empty"); |
| |
| for (auto &Op : Ops) { |
| assert(!Op.empty() && "Empty operator"); |
| if (FeaturesMap.find(Op) == FeaturesMap.end()) |
| FeaturesMap[Op] = FeaturesMap.size(); |
| } |
| } |
| } |
| |
| unsigned getMCOpPredicate(DenseMap<const Record *, unsigned> &MCOpPredicateMap, |
| std::vector<const Record *> &MCOpPredicates, |
| Record *Rec) { |
| unsigned Entry = MCOpPredicateMap[Rec]; |
| if (Entry) |
| return Entry; |
| |
| if (!Rec->isValueUnset("MCOperandPredicate")) { |
| MCOpPredicates.push_back(Rec); |
| Entry = MCOpPredicates.size(); |
| MCOpPredicateMap[Rec] = Entry; |
| return Entry; |
| } |
| |
| PrintFatalError(Rec->getLoc(), |
| "No MCOperandPredicate on this operand at all: " + |
| Rec->getName().str() + "'"); |
| return 0; |
| } |
| |
| static std::string mergeCondAndCode(raw_string_ostream &CondStream, |
| raw_string_ostream &CodeStream) { |
| std::string S; |
| raw_string_ostream CombinedStream(S); |
| CombinedStream.indent(4) |
| << "if (" |
| << CondStream.str().substr( |
| 6, CondStream.str().length() - |
| 10) // remove first indentation and last '&&'. |
| << ") {\n"; |
| CombinedStream << CodeStream.str(); |
| CombinedStream.indent(4) << " return true;\n"; |
| CombinedStream.indent(4) << "} // if\n"; |
| return CombinedStream.str(); |
| } |
| |
| void RISCVCompressInstEmitter::emitCompressInstEmitter(raw_ostream &o, |
| bool Compress) { |
| Record *AsmWriter = Target.getAsmWriter(); |
| if (!AsmWriter->getValueAsInt("PassSubtarget")) |
| PrintFatalError(AsmWriter->getLoc(), |
| "'PassSubtarget' is false. SubTargetInfo object is needed " |
| "for target features.\n"); |
| |
| std::string Namespace = Target.getName(); |
| |
| // Sort entries in CompressPatterns to handle instructions that can have more |
| // than one candidate for compression\uncompression, e.g ADD can be |
| // transformed to a C_ADD or a C_MV. When emitting 'uncompress()' function the |
| // source and destination are flipped and the sort key needs to change |
| // accordingly. |
| std::stable_sort(CompressPatterns.begin(), CompressPatterns.end(), |
| [Compress](const CompressPat &LHS, const CompressPat &RHS) { |
| if (Compress) |
| return (LHS.Source.TheDef->getName().str() < |
| RHS.Source.TheDef->getName().str()); |
| else |
| return (LHS.Dest.TheDef->getName().str() < |
| RHS.Dest.TheDef->getName().str()); |
| }); |
| |
| // A list of MCOperandPredicates for all operands in use, and the reverse map. |
| std::vector<const Record *> MCOpPredicates; |
| DenseMap<const Record *, unsigned> MCOpPredicateMap; |
| |
| std::string F; |
| std::string FH; |
| raw_string_ostream Func(F); |
| raw_string_ostream FuncH(FH); |
| bool NeedMRI = false; |
| |
| if (Compress) |
| o << "\n#ifdef GEN_COMPRESS_INSTR\n" |
| << "#undef GEN_COMPRESS_INSTR\n\n"; |
| else |
| o << "\n#ifdef GEN_UNCOMPRESS_INSTR\n" |
| << "#undef GEN_UNCOMPRESS_INSTR\n\n"; |
| |
| if (Compress) { |
| FuncH << "static bool compressInst(MCInst& OutInst,\n"; |
| FuncH.indent(25) << "const MCInst &MI,\n"; |
| FuncH.indent(25) << "const MCSubtargetInfo &STI,\n"; |
| FuncH.indent(25) << "MCContext &Context) {\n"; |
| } else { |
| FuncH << "static bool uncompressInst(MCInst& OutInst,\n"; |
| FuncH.indent(27) << "const MCInst &MI,\n"; |
| FuncH.indent(27) << "const MCRegisterInfo &MRI,\n"; |
| FuncH.indent(27) << "const MCSubtargetInfo &STI) {\n"; |
| } |
| |
| if (CompressPatterns.empty()) { |
| o << FuncH.str(); |
| o.indent(2) << "return false;\n}\n"; |
| if (Compress) |
| o << "\n#endif //GEN_COMPRESS_INSTR\n"; |
| else |
| o << "\n#endif //GEN_UNCOMPRESS_INSTR\n\n"; |
| return; |
| } |
| |
| std::string CaseString(""); |
| raw_string_ostream CaseStream(CaseString); |
| std::string PrevOp(""); |
| std::string CurOp(""); |
| CaseStream << " switch (MI.getOpcode()) {\n"; |
| CaseStream << " default: return false;\n"; |
| |
| for (auto &CompressPat : CompressPatterns) { |
| std::string CondString; |
| std::string CodeString; |
| raw_string_ostream CondStream(CondString); |
| raw_string_ostream CodeStream(CodeString); |
| CodeGenInstruction &Source = |
| Compress ? CompressPat.Source : CompressPat.Dest; |
| CodeGenInstruction &Dest = Compress ? CompressPat.Dest : CompressPat.Source; |
| IndexedMap<OpData> SourceOperandMap = |
| Compress ? CompressPat.SourceOperandMap : CompressPat.DestOperandMap; |
| IndexedMap<OpData> &DestOperandMap = |
| Compress ? CompressPat.DestOperandMap : CompressPat.SourceOperandMap; |
| |
| CurOp = Source.TheDef->getName().str(); |
| // Check current and previous opcode to decide to continue or end a case. |
| if (CurOp != PrevOp) { |
| if (PrevOp != "") |
| CaseStream.indent(6) << "break;\n } // case " + PrevOp + "\n"; |
| CaseStream.indent(4) << "case " + Namespace + "::" + CurOp + ": {\n"; |
| } |
| |
| std::map<StringRef, int> FeaturesMap; |
| // Add CompressPat required features. |
| getReqFeatures(FeaturesMap, CompressPat.PatReqFeatures); |
| |
| // Add Dest instruction required features. |
| std::vector<Record *> ReqFeatures; |
| std::vector<Record *> RF = Dest.TheDef->getValueAsListOfDefs("Predicates"); |
| copy_if(RF, std::back_inserter(ReqFeatures), [](Record *R) { |
| return R->getValueAsBit("AssemblerMatcherPredicate"); |
| }); |
| getReqFeatures(FeaturesMap, ReqFeatures); |
| |
| // Emit checks for all required features. |
| for (auto &F : FeaturesMap) { |
| StringRef Op = F.first; |
| if (Op[0] == '!') |
| CondStream.indent(6) << ("!STI.getFeatureBits()[" + Namespace + |
| "::" + Op.substr(1) + "]") |
| .str() + |
| " &&\n"; |
| else |
| CondStream.indent(6) |
| << ("STI.getFeatureBits()[" + Namespace + "::" + Op + "]").str() + |
| " &&\n"; |
| } |
| |
| // Start Source Inst operands validation. |
| unsigned OpNo = 0; |
| for (OpNo = 0; OpNo < Source.Operands.size(); ++OpNo) { |
| if (SourceOperandMap[OpNo].TiedOpIdx != -1) { |
| if (Source.Operands[OpNo].Rec->isSubClassOf("RegisterClass")) |
| CondStream.indent(6) |
| << "(MI.getOperand(" |
| << std::to_string(OpNo) + ").getReg() == MI.getOperand(" |
| << std::to_string(SourceOperandMap[OpNo].TiedOpIdx) |
| << ").getReg()) &&\n"; |
| else |
| PrintFatalError("Unexpected tied operand types!\n"); |
| } |
| // Check for fixed immediates\registers in the source instruction. |
| switch (SourceOperandMap[OpNo].Kind) { |
| case OpData::Operand: |
| // We don't need to do anything for source instruction operand checks. |
| break; |
| case OpData::Imm: |
| CondStream.indent(6) |
| << "(MI.getOperand(" + std::to_string(OpNo) + ").isImm()) &&\n" + |
| " (MI.getOperand(" + std::to_string(OpNo) + |
| ").getImm() == " + |
| std::to_string(SourceOperandMap[OpNo].Data.Imm) + ") &&\n"; |
| break; |
| case OpData::Reg: { |
| Record *Reg = SourceOperandMap[OpNo].Data.Reg; |
| CondStream.indent(6) << "(MI.getOperand(" + std::to_string(OpNo) + |
| ").getReg() == " + Namespace + |
| "::" + Reg->getName().str() + ") &&\n"; |
| break; |
| } |
| } |
| } |
| CodeStream.indent(6) << "// " + Dest.AsmString + "\n"; |
| CodeStream.indent(6) << "OutInst.setOpcode(" + Namespace + |
| "::" + Dest.TheDef->getName().str() + ");\n"; |
| OpNo = 0; |
| for (const auto &DestOperand : Dest.Operands) { |
| CodeStream.indent(6) << "// Operand: " + DestOperand.Name + "\n"; |
| switch (DestOperandMap[OpNo].Kind) { |
| case OpData::Operand: { |
| unsigned OpIdx = DestOperandMap[OpNo].Data.Operand; |
| // Check that the operand in the Source instruction fits |
| // the type for the Dest instruction. |
| if (DestOperand.Rec->isSubClassOf("RegisterClass")) { |
| NeedMRI = true; |
| // This is a register operand. Check the register class. |
| // Don't check register class if this is a tied operand, it was done |
| // for the operand its tied to. |
| if (DestOperand.getTiedRegister() == -1) |
| CondStream.indent(6) |
| << "(MRI.getRegClass(" + Namespace + |
| "::" + DestOperand.Rec->getName().str() + |
| "RegClassID).contains(" + "MI.getOperand(" + |
| std::to_string(OpIdx) + ").getReg())) &&\n"; |
| |
| CodeStream.indent(6) << "OutInst.addOperand(MI.getOperand(" + |
| std::to_string(OpIdx) + "));\n"; |
| } else { |
| // Handling immediate operands. |
| unsigned Entry = getMCOpPredicate(MCOpPredicateMap, MCOpPredicates, |
| DestOperand.Rec); |
| CondStream.indent(6) << Namespace + "ValidateMCOperand(" + |
| "MI.getOperand(" + std::to_string(OpIdx) + |
| "), STI, " + std::to_string(Entry) + |
| ") &&\n"; |
| CodeStream.indent(6) << "OutInst.addOperand(MI.getOperand(" + |
| std::to_string(OpIdx) + "));\n"; |
| } |
| break; |
| } |
| case OpData::Imm: { |
| unsigned Entry = |
| getMCOpPredicate(MCOpPredicateMap, MCOpPredicates, DestOperand.Rec); |
| CondStream.indent(6) |
| << Namespace + "ValidateMCOperand(" + "MCOperand::createImm(" + |
| std::to_string(DestOperandMap[OpNo].Data.Imm) + "), STI, " + |
| std::to_string(Entry) + ") &&\n"; |
| CodeStream.indent(6) |
| << "OutInst.addOperand(MCOperand::createImm(" + |
| std::to_string(DestOperandMap[OpNo].Data.Imm) + "));\n"; |
| } break; |
| case OpData::Reg: { |
| // Fixed register has been validated at pattern validation time. |
| Record *Reg = DestOperandMap[OpNo].Data.Reg; |
| CodeStream.indent(6) << "OutInst.addOperand(MCOperand::createReg(" + |
| Namespace + "::" + Reg->getName().str() + |
| "));\n"; |
| } break; |
| } |
| ++OpNo; |
| } |
| CaseStream << mergeCondAndCode(CondStream, CodeStream); |
| PrevOp = CurOp; |
| } |
| Func << CaseStream.str() << "\n"; |
| // Close brace for the last case. |
| Func.indent(4) << "} // case " + CurOp + "\n"; |
| Func.indent(2) << "} // switch\n"; |
| Func.indent(2) << "return false;\n}\n"; |
| |
| if (!MCOpPredicates.empty()) { |
| o << "static bool " << Namespace |
| << "ValidateMCOperand(const MCOperand &MCOp,\n" |
| << " const MCSubtargetInfo &STI,\n" |
| << " unsigned PredicateIndex) {\n" |
| << " switch (PredicateIndex) {\n" |
| << " default:\n" |
| << " llvm_unreachable(\"Unknown MCOperandPredicate kind\");\n" |
| << " break;\n"; |
| |
| for (unsigned i = 0; i < MCOpPredicates.size(); ++i) { |
| Init *MCOpPred = MCOpPredicates[i]->getValueInit("MCOperandPredicate"); |
| if (CodeInit *SI = dyn_cast<CodeInit>(MCOpPred)) |
| o << " case " << i + 1 << ": {\n" |
| << " // " << MCOpPredicates[i]->getName().str() << SI->getValue() |
| << "\n" |
| << " }\n"; |
| else |
| llvm_unreachable("Unexpected MCOperandPredicate field!"); |
| } |
| o << " }\n" |
| << "}\n\n"; |
| } |
| |
| o << FuncH.str(); |
| if (NeedMRI && Compress) |
| o.indent(2) << "const MCRegisterInfo &MRI = *Context.getRegisterInfo();\n"; |
| o << Func.str(); |
| |
| if (Compress) |
| o << "\n#endif //GEN_COMPRESS_INSTR\n"; |
| else |
| o << "\n#endif //GEN_UNCOMPRESS_INSTR\n\n"; |
| } |
| |
| void RISCVCompressInstEmitter::run(raw_ostream &o) { |
| Record *CompressClass = Records.getClass("CompressPat"); |
| assert(CompressClass && "Compress class definition missing!"); |
| std::vector<Record *> Insts; |
| for (const auto &D : Records.getDefs()) { |
| if (D.second->isSubClassOf(CompressClass)) |
| Insts.push_back(D.second.get()); |
| } |
| |
| // Process the CompressPat definitions, validating them as we do so. |
| for (unsigned i = 0, e = Insts.size(); i != e; ++i) |
| evaluateCompressPat(Insts[i]); |
| |
| // Emit file header. |
| emitSourceFileHeader("Compress instruction Source Fragment", o); |
| // Generate compressInst() function. |
| emitCompressInstEmitter(o, true); |
| // Generate uncompressInst() function. |
| emitCompressInstEmitter(o, false); |
| } |
| |
| namespace llvm { |
| |
| void EmitCompressInst(RecordKeeper &RK, raw_ostream &OS) { |
| RISCVCompressInstEmitter(RK).run(OS); |
| } |
| |
| } // namespace llvm |
