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//===------ MacroFusionPredicatorEmitter.cpp - Generator for Fusion ------===//
//
// 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
//
//===---------------------------------------------------------------------===//
//
// MacroFusionPredicatorEmitter implements a TableGen-driven predicators
// generator for macro-op fusions.
//
// This TableGen backend processes `Fusion` definitions and generates
// predicators for checking if input instructions can be fused. These
// predicators can used in `MacroFusion` DAG mutation.
//
// The generated header file contains two parts: one for predicator
// declarations and one for predicator implementations. The user can get them
// by defining macro `GET_<TargetName>_MACRO_FUSION_PRED_DECL` or
// `GET_<TargetName>_MACRO_FUSION_PRED_IMPL` and then including the generated
// header file.
//
// The generated predicator will be like:
//
// ```
// bool isNAME(const TargetInstrInfo &TII,
// const TargetSubtargetInfo &STI,
// const MachineInstr *FirstMI,
// const MachineInstr &SecondMI) {
// auto &MRI = SecondMI.getMF()->getRegInfo();
// /* Predicates */
// return true;
// }
// ```
//
// The `Predicates` part is generated from a list of `FusionPredicate`, which
// can be predefined predicates, a raw code string or `MCInstPredicate` defined
// in TargetInstrPredicate.td.
//
//===---------------------------------------------------------------------===//
#include "Common/CodeGenTarget.h"
#include "Common/PredicateExpander.h"
#include "llvm/Support/Debug.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/TableGenBackend.h"
#include <vector>
using namespace llvm;
#define DEBUG_TYPE "macro-fusion-predicator"
namespace {
class MacroFusionPredicatorEmitter {
RecordKeeper &Records;
CodeGenTarget Target;
void emitMacroFusionDecl(ArrayRef<Record *> Fusions, PredicateExpander &PE,
raw_ostream &OS);
void emitMacroFusionImpl(ArrayRef<Record *> Fusions, PredicateExpander &PE,
raw_ostream &OS);
void emitPredicates(ArrayRef<Record *> FirstPredicate, bool IsCommutable,
PredicateExpander &PE, raw_ostream &OS);
void emitFirstPredicate(Record *SecondPredicate, bool IsCommutable,
PredicateExpander &PE, raw_ostream &OS);
void emitSecondPredicate(Record *SecondPredicate, bool IsCommutable,
PredicateExpander &PE, raw_ostream &OS);
void emitBothPredicate(Record *Predicates, bool IsCommutable,
PredicateExpander &PE, raw_ostream &OS);
public:
MacroFusionPredicatorEmitter(RecordKeeper &R) : Records(R), Target(R) {}
void run(raw_ostream &OS);
};
} // End anonymous namespace.
void MacroFusionPredicatorEmitter::emitMacroFusionDecl(
ArrayRef<Record *> Fusions, PredicateExpander &PE, raw_ostream &OS) {
OS << "#ifdef GET_" << Target.getName() << "_MACRO_FUSION_PRED_DECL\n";
OS << "#undef GET_" << Target.getName() << "_MACRO_FUSION_PRED_DECL\n\n";
OS << "namespace llvm {\n";
for (Record *Fusion : Fusions) {
OS << "bool is" << Fusion->getName() << "(const TargetInstrInfo &, "
<< "const TargetSubtargetInfo &, "
<< "const MachineInstr *, "
<< "const MachineInstr &);\n";
}
OS << "} // end namespace llvm\n";
OS << "\n#endif\n";
}
void MacroFusionPredicatorEmitter::emitMacroFusionImpl(
ArrayRef<Record *> Fusions, PredicateExpander &PE, raw_ostream &OS) {
OS << "#ifdef GET_" << Target.getName() << "_MACRO_FUSION_PRED_IMPL\n";
OS << "#undef GET_" << Target.getName() << "_MACRO_FUSION_PRED_IMPL\n\n";
OS << "namespace llvm {\n";
for (Record *Fusion : Fusions) {
std::vector<Record *> Predicates =
Fusion->getValueAsListOfDefs("Predicates");
bool IsCommutable = Fusion->getValueAsBit("IsCommutable");
OS << "bool is" << Fusion->getName() << "(\n";
OS.indent(4) << "const TargetInstrInfo &TII,\n";
OS.indent(4) << "const TargetSubtargetInfo &STI,\n";
OS.indent(4) << "const MachineInstr *FirstMI,\n";
OS.indent(4) << "const MachineInstr &SecondMI) {\n";
OS.indent(2)
<< "[[maybe_unused]] auto &MRI = SecondMI.getMF()->getRegInfo();\n";
emitPredicates(Predicates, IsCommutable, PE, OS);
OS.indent(2) << "return true;\n";
OS << "}\n";
}
OS << "} // end namespace llvm\n";
OS << "\n#endif\n";
}
void MacroFusionPredicatorEmitter::emitPredicates(ArrayRef<Record *> Predicates,
bool IsCommutable,
PredicateExpander &PE,
raw_ostream &OS) {
for (Record *Predicate : Predicates) {
Record *Target = Predicate->getValueAsDef("Target");
if (Target->getName() == "first_fusion_target")
emitFirstPredicate(Predicate, IsCommutable, PE, OS);
else if (Target->getName() == "second_fusion_target")
emitSecondPredicate(Predicate, IsCommutable, PE, OS);
else if (Target->getName() == "both_fusion_target")
emitBothPredicate(Predicate, IsCommutable, PE, OS);
else
PrintFatalError(Target->getLoc(),
"Unsupported 'FusionTarget': " + Target->getName());
}
}
void MacroFusionPredicatorEmitter::emitFirstPredicate(Record *Predicate,
bool IsCommutable,
PredicateExpander &PE,
raw_ostream &OS) {
if (Predicate->isSubClassOf("WildcardPred")) {
OS.indent(2) << "if (!FirstMI)\n";
OS.indent(2) << " return "
<< (Predicate->getValueAsBit("ReturnValue") ? "true" : "false")
<< ";\n";
} else if (Predicate->isSubClassOf("OneUsePred")) {
OS.indent(2) << "{\n";
OS.indent(4) << "Register FirstDest = FirstMI->getOperand(0).getReg();\n";
OS.indent(4)
<< "if (FirstDest.isVirtual() && !MRI.hasOneNonDBGUse(FirstDest))\n";
OS.indent(4) << " return false;\n";
OS.indent(2) << "}\n";
} else if (Predicate->isSubClassOf("FusionPredicateWithMCInstPredicate")) {
OS.indent(2) << "{\n";
OS.indent(4) << "const MachineInstr *MI = FirstMI;\n";
OS.indent(4) << "if (";
PE.setNegatePredicate(true);
PE.setIndentLevel(3);
PE.expandPredicate(OS, Predicate->getValueAsDef("Predicate"));
OS << ")\n";
OS.indent(4) << " return false;\n";
OS.indent(2) << "}\n";
} else {
PrintFatalError(Predicate->getLoc(),
"Unsupported predicate for first instruction: " +
Predicate->getType()->getAsString());
}
}
void MacroFusionPredicatorEmitter::emitSecondPredicate(Record *Predicate,
bool IsCommutable,
PredicateExpander &PE,
raw_ostream &OS) {
if (Predicate->isSubClassOf("FusionPredicateWithMCInstPredicate")) {
OS.indent(2) << "{\n";
OS.indent(4) << "const MachineInstr *MI = &SecondMI;\n";
OS.indent(4) << "if (";
PE.setNegatePredicate(true);
PE.setIndentLevel(3);
PE.expandPredicate(OS, Predicate->getValueAsDef("Predicate"));
OS << ")\n";
OS.indent(4) << " return false;\n";
OS.indent(2) << "}\n";
} else if (Predicate->isSubClassOf("SameReg")) {
int FirstOpIdx = Predicate->getValueAsInt("FirstOpIdx");
int SecondOpIdx = Predicate->getValueAsInt("SecondOpIdx");
OS.indent(2) << "if (!SecondMI.getOperand(" << FirstOpIdx
<< ").getReg().isVirtual()) {\n";
OS.indent(4) << "if (SecondMI.getOperand(" << FirstOpIdx
<< ").getReg() != SecondMI.getOperand(" << SecondOpIdx
<< ").getReg())";
if (IsCommutable) {
OS << " {\n";
OS.indent(6) << "if (!SecondMI.getDesc().isCommutable())\n";
OS.indent(6) << " return false;\n";
OS.indent(6)
<< "unsigned SrcOpIdx1 = " << SecondOpIdx
<< ", SrcOpIdx2 = TargetInstrInfo::CommuteAnyOperandIndex;\n";
OS.indent(6)
<< "if (TII.findCommutedOpIndices(SecondMI, SrcOpIdx1, SrcOpIdx2))\n";
OS.indent(6)
<< " if (SecondMI.getOperand(" << FirstOpIdx
<< ").getReg() != SecondMI.getOperand(SrcOpIdx2).getReg())\n";
OS.indent(6) << " return false;\n";
OS.indent(4) << "}\n";
} else {
OS << "\n";
OS.indent(4) << " return false;\n";
}
OS.indent(2) << "}\n";
} else {
PrintFatalError(Predicate->getLoc(),
"Unsupported predicate for second instruction: " +
Predicate->getType()->getAsString());
}
}
void MacroFusionPredicatorEmitter::emitBothPredicate(Record *Predicate,
bool IsCommutable,
PredicateExpander &PE,
raw_ostream &OS) {
if (Predicate->isSubClassOf("FusionPredicateWithCode"))
OS << Predicate->getValueAsString("Predicate");
else if (Predicate->isSubClassOf("BothFusionPredicateWithMCInstPredicate")) {
emitFirstPredicate(Predicate, IsCommutable, PE, OS);
emitSecondPredicate(Predicate, IsCommutable, PE, OS);
} else if (Predicate->isSubClassOf("TieReg")) {
int FirstOpIdx = Predicate->getValueAsInt("FirstOpIdx");
int SecondOpIdx = Predicate->getValueAsInt("SecondOpIdx");
OS.indent(2) << "if (!(FirstMI->getOperand(" << FirstOpIdx
<< ").isReg() &&\n";
OS.indent(2) << " SecondMI.getOperand(" << SecondOpIdx
<< ").isReg() &&\n";
OS.indent(2) << " FirstMI->getOperand(" << FirstOpIdx
<< ").getReg() == SecondMI.getOperand(" << SecondOpIdx
<< ").getReg()))";
if (IsCommutable) {
OS << " {\n";
OS.indent(4) << "if (!SecondMI.getDesc().isCommutable())\n";
OS.indent(4) << " return false;\n";
OS.indent(4)
<< "unsigned SrcOpIdx1 = " << SecondOpIdx
<< ", SrcOpIdx2 = TargetInstrInfo::CommuteAnyOperandIndex;\n";
OS.indent(4)
<< "if (TII.findCommutedOpIndices(SecondMI, SrcOpIdx1, SrcOpIdx2))\n";
OS.indent(4)
<< " if (FirstMI->getOperand(" << FirstOpIdx
<< ").getReg() != SecondMI.getOperand(SrcOpIdx2).getReg())\n";
OS.indent(4) << " return false;\n";
OS.indent(2) << "}";
} else {
OS << "\n";
OS.indent(2) << " return false;";
}
OS << "\n";
} else
PrintFatalError(Predicate->getLoc(),
"Unsupported predicate for both instruction: " +
Predicate->getType()->getAsString());
}
void MacroFusionPredicatorEmitter::run(raw_ostream &OS) {
// Emit file header.
emitSourceFileHeader("Macro Fusion Predicators", OS);
PredicateExpander PE(Target.getName());
PE.setByRef(false);
PE.setExpandForMC(false);
std::vector<Record *> Fusions = Records.getAllDerivedDefinitions("Fusion");
// Sort macro fusions by name.
sort(Fusions, LessRecord());
emitMacroFusionDecl(Fusions, PE, OS);
OS << "\n";
emitMacroFusionImpl(Fusions, PE, OS);
}
static TableGen::Emitter::OptClass<MacroFusionPredicatorEmitter>
X("gen-macro-fusion-pred", "Generate macro fusion predicators.");
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