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GlobalISelEmitter.cpp
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//===- GlobalISelEmitter.cpp - Generate an instruction selector -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// \file
/// This tablegen backend emits code for use by the GlobalISel instruction
/// selector. See include/llvm/CodeGen/TargetGlobalISel.td.
///
/// This file analyzes the patterns recognized by the SelectionDAGISel tablegen
/// backend, filters out the ones that are unsupported, maps
/// SelectionDAG-specific constructs to their GlobalISel counterpart
/// (when applicable: MVT to LLT; SDNode to generic Instruction).
///
/// Not all patterns are supported: pass the tablegen invocation
/// "-warn-on-skipped-patterns" to emit a warning when a pattern is skipped,
/// as well as why.
///
/// The generated file defines a single method:
/// bool <Target>InstructionSelector::selectImpl(MachineInstr &I) const;
/// intended to be used in InstructionSelector::select as the first-step
/// selector for the patterns that don't require complex C++.
///
/// FIXME: We'll probably want to eventually define a base
/// "TargetGenInstructionSelector" class.
///
//===----------------------------------------------------------------------===//
#include "CodeGenDAGPatterns.h"
#include "SubtargetFeatureInfo.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineValueType.h"
#include "llvm/Support/CodeGenCoverage.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/LowLevelTypeImpl.h"
#include "llvm/Support/ScopedPrinter.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/TableGenBackend.h"
#include <numeric>
#include <string>
using namespace llvm;
#define DEBUG_TYPE "gisel-emitter"
STATISTIC(NumPatternTotal, "Total number of patterns");
STATISTIC(NumPatternImported, "Number of patterns imported from SelectionDAG");
STATISTIC(NumPatternImportsSkipped, "Number of SelectionDAG imports skipped");
STATISTIC(NumPatternsTested, "Number of patterns executed according to coverage information");
STATISTIC(NumPatternEmitted, "Number of patterns emitted");
cl::OptionCategory GlobalISelEmitterCat("Options for -gen-global-isel");
static cl::opt<bool> WarnOnSkippedPatterns(
"warn-on-skipped-patterns",
cl::desc("Explain why a pattern was skipped for inclusion "
"in the GlobalISel selector"),
cl::init(false), cl::cat(GlobalISelEmitterCat));
static cl::opt<bool> GenerateCoverage(
"instrument-gisel-coverage",
cl::desc("Generate coverage instrumentation for GlobalISel"),
cl::init(false), cl::cat(GlobalISelEmitterCat));
static cl::opt<std::string> UseCoverageFile(
"gisel-coverage-file", cl::init(""),
cl::desc("Specify file to retrieve coverage information from"),
cl::cat(GlobalISelEmitterCat));
static cl::opt<bool> OptimizeMatchTable(
"optimize-match-table",
cl::desc("Generate an optimized version of the match table"),
cl::init(true), cl::cat(GlobalISelEmitterCat));
namespace {
//===- Helper functions ---------------------------------------------------===//
/// Get the name of the enum value used to number the predicate function.
std::string getEnumNameForPredicate(const TreePredicateFn &Predicate) {
return "GIPFP_" + Predicate.getImmTypeIdentifier().str() + "_" +
Predicate.getFnName();
}
/// Get the opcode used to check this predicate.
std::string getMatchOpcodeForPredicate(const TreePredicateFn &Predicate) {
return "GIM_Check" + Predicate.getImmTypeIdentifier().str() + "ImmPredicate";
}
/// This class stands in for LLT wherever we want to tablegen-erate an
/// equivalent at compiler run-time.
class LLTCodeGen {
private:
LLT Ty;
public:
LLTCodeGen(const LLT &Ty) : Ty(Ty) {}
std::string getCxxEnumValue() const {
std::string Str;
raw_string_ostream OS(Str);
emitCxxEnumValue(OS);
return OS.str();
}
void emitCxxEnumValue(raw_ostream &OS) const {
if (Ty.isScalar()) {
OS << "GILLT_s" << Ty.getSizeInBits();
return;
}
if (Ty.isVector()) {
OS << "GILLT_v" << Ty.getNumElements() << "s" << Ty.getScalarSizeInBits();
return;
}
if (Ty.isPointer()) {
OS << "GILLT_p" << Ty.getAddressSpace();
if (Ty.getSizeInBits() > 0)
OS << "s" << Ty.getSizeInBits();
return;
}
llvm_unreachable("Unhandled LLT");
}
void emitCxxConstructorCall(raw_ostream &OS) const {
if (Ty.isScalar()) {
OS << "LLT::scalar(" << Ty.getSizeInBits() << ")";
return;
}
if (Ty.isVector()) {
OS << "LLT::vector(" << Ty.getNumElements() << ", "
<< Ty.getScalarSizeInBits() << ")";
return;
}
if (Ty.isPointer() && Ty.getSizeInBits() > 0) {
OS << "LLT::pointer(" << Ty.getAddressSpace() << ", "
<< Ty.getSizeInBits() << ")";
return;
}
llvm_unreachable("Unhandled LLT");
}
const LLT &get() const { return Ty; }
/// This ordering is used for std::unique() and std::sort(). There's no
/// particular logic behind the order but either A < B or B < A must be
/// true if A != B.
bool operator<(const LLTCodeGen &Other) const {
if (Ty.isValid() != Other.Ty.isValid())
return Ty.isValid() < Other.Ty.isValid();
if (!Ty.isValid())
return false;
if (Ty.isVector() != Other.Ty.isVector())
return Ty.isVector() < Other.Ty.isVector();
if (Ty.isScalar() != Other.Ty.isScalar())
return Ty.isScalar() < Other.Ty.isScalar();
if (Ty.isPointer() != Other.Ty.isPointer())
return Ty.isPointer() < Other.Ty.isPointer();
if (Ty.isPointer() && Ty.getAddressSpace() != Other.Ty.getAddressSpace())
return Ty.getAddressSpace() < Other.Ty.getAddressSpace();
if (Ty.isVector() && Ty.getNumElements() != Other.Ty.getNumElements())
return Ty.getNumElements() < Other.Ty.getNumElements();
return Ty.getSizeInBits() < Other.Ty.getSizeInBits();
}
bool operator==(const LLTCodeGen &B) const { return Ty == B.Ty; }
};
class InstructionMatcher;
/// Convert an MVT to an equivalent LLT if possible, or the invalid LLT() for
/// MVTs that don't map cleanly to an LLT (e.g., iPTR, *any, ...).
static Optional<LLTCodeGen> MVTToLLT(MVT::SimpleValueType SVT) {
MVT VT(SVT);
if (VT.isVector() && VT.getVectorNumElements() != 1)
return LLTCodeGen(
LLT::vector(VT.getVectorNumElements(), VT.getScalarSizeInBits()));
if (VT.isInteger() || VT.isFloatingPoint())
return LLTCodeGen(LLT::scalar(VT.getSizeInBits()));
return None;
}
static std::string explainPredicates(const TreePatternNode *N) {
std::string Explanation = "";
StringRef Separator = "";
for (const auto &P : N->getPredicateFns()) {
Explanation +=
(Separator + P.getOrigPatFragRecord()->getRecord()->getName()).str();
Separator = ", ";
if (P.isAlwaysTrue())
Explanation += " always-true";
if (P.isImmediatePattern())
Explanation += " immediate";
if (P.isUnindexed())
Explanation += " unindexed";
if (P.isNonExtLoad())
Explanation += " non-extload";
if (P.isAnyExtLoad())
Explanation += " extload";
if (P.isSignExtLoad())
Explanation += " sextload";
if (P.isZeroExtLoad())
Explanation += " zextload";
if (P.isNonTruncStore())
Explanation += " non-truncstore";
if (P.isTruncStore())
Explanation += " truncstore";
if (Record *VT = P.getMemoryVT())
Explanation += (" MemVT=" + VT->getName()).str();
if (Record *VT = P.getScalarMemoryVT())
Explanation += (" ScalarVT(MemVT)=" + VT->getName()).str();
if (P.isAtomicOrderingMonotonic())
Explanation += " monotonic";
if (P.isAtomicOrderingAcquire())
Explanation += " acquire";
if (P.isAtomicOrderingRelease())
Explanation += " release";
if (P.isAtomicOrderingAcquireRelease())
Explanation += " acq_rel";
if (P.isAtomicOrderingSequentiallyConsistent())
Explanation += " seq_cst";
if (P.isAtomicOrderingAcquireOrStronger())
Explanation += " >=acquire";
if (P.isAtomicOrderingWeakerThanAcquire())
Explanation += " <acquire";
if (P.isAtomicOrderingReleaseOrStronger())
Explanation += " >=release";
if (P.isAtomicOrderingWeakerThanRelease())
Explanation += " <release";
}
return Explanation;
}
std::string explainOperator(Record *Operator) {
if (Operator->isSubClassOf("SDNode"))
return (" (" + Operator->getValueAsString("Opcode") + ")").str();
if (Operator->isSubClassOf("Intrinsic"))
return (" (Operator is an Intrinsic, " + Operator->getName() + ")").str();
if (Operator->isSubClassOf("ComplexPattern"))
return (" (Operator is an unmapped ComplexPattern, " + Operator->getName() +
")")
.str();
return (" (Operator " + Operator->getName() + " not understood)").str();
}
/// Helper function to let the emitter report skip reason error messages.
static Error failedImport(const Twine &Reason) {
return make_error<StringError>(Reason, inconvertibleErrorCode());
}
static Error isTrivialOperatorNode(const TreePatternNode *N) {
std::string Explanation = "";
std::string Separator = "";
bool HasUnsupportedPredicate = false;
for (const auto &Predicate : N->getPredicateFns()) {
if (Predicate.isAlwaysTrue())
continue;
if (Predicate.isImmediatePattern())
continue;
if (Predicate.isNonExtLoad())
continue;
if (Predicate.isNonTruncStore())
continue;
if (Predicate.isLoad() || Predicate.isStore()) {
if (Predicate.isUnindexed())
continue;
}
if (Predicate.isAtomic() && Predicate.getMemoryVT())
continue;
if (Predicate.isAtomic() &&
(Predicate.isAtomicOrderingMonotonic() ||
Predicate.isAtomicOrderingAcquire() ||
Predicate.isAtomicOrderingRelease() ||
Predicate.isAtomicOrderingAcquireRelease() ||
Predicate.isAtomicOrderingSequentiallyConsistent() ||
Predicate.isAtomicOrderingAcquireOrStronger() ||
Predicate.isAtomicOrderingWeakerThanAcquire() ||
Predicate.isAtomicOrderingReleaseOrStronger() ||
Predicate.isAtomicOrderingWeakerThanRelease()))
continue;
HasUnsupportedPredicate = true;
Explanation = Separator + "Has a predicate (" + explainPredicates(N) + ")";
Separator = ", ";
Explanation += (Separator + "first-failing:" +
Predicate.getOrigPatFragRecord()->getRecord()->getName())
.str();
break;
}
if (N->getTransformFn()) {
Explanation += Separator + "Has a transform function";
Separator = ", ";
}
if (!HasUnsupportedPredicate && !N->getTransformFn())
return Error::success();
return failedImport(Explanation);
}
static Record *getInitValueAsRegClass(Init *V) {
if (DefInit *VDefInit = dyn_cast<DefInit>(V)) {
if (VDefInit->getDef()->isSubClassOf("RegisterOperand"))
return VDefInit->getDef()->getValueAsDef("RegClass");
if (VDefInit->getDef()->isSubClassOf("RegisterClass"))
return VDefInit->getDef();
}
return nullptr;
}
std::string
getNameForFeatureBitset(const std::vector<Record *> &FeatureBitset) {
std::string Name = "GIFBS";
for (const auto &Feature : FeatureBitset)
Name += ("_" + Feature->getName()).str();
return Name;
}
//===- MatchTable Helpers -------------------------------------------------===//
class MatchTable;
/// A record to be stored in a MatchTable.
///
/// This class represents any and all output that may be required to emit the
/// MatchTable. Instances are most often configured to represent an opcode or
/// value that will be emitted to the table with some formatting but it can also
/// represent commas, comments, and other formatting instructions.
struct MatchTableRecord {
enum RecordFlagsBits {
MTRF_None = 0x0,
/// Causes EmitStr to be formatted as comment when emitted.
MTRF_Comment = 0x1,
/// Causes the record value to be followed by a comma when emitted.
MTRF_CommaFollows = 0x2,
/// Causes the record value to be followed by a line break when emitted.
MTRF_LineBreakFollows = 0x4,
/// Indicates that the record defines a label and causes an additional
/// comment to be emitted containing the index of the label.
MTRF_Label = 0x8,
/// Causes the record to be emitted as the index of the label specified by
/// LabelID along with a comment indicating where that label is.
MTRF_JumpTarget = 0x10,
/// Causes the formatter to add a level of indentation before emitting the
/// record.
MTRF_Indent = 0x20,
/// Causes the formatter to remove a level of indentation after emitting the
/// record.
MTRF_Outdent = 0x40,
};
/// When MTRF_Label or MTRF_JumpTarget is used, indicates a label id to
/// reference or define.
unsigned LabelID;
/// The string to emit. Depending on the MTRF_* flags it may be a comment, a
/// value, a label name.
std::string EmitStr;
private:
/// The number of MatchTable elements described by this record. Comments are 0
/// while values are typically 1. Values >1 may occur when we need to emit
/// values that exceed the size of a MatchTable element.
unsigned NumElements;
public:
/// A bitfield of RecordFlagsBits flags.
unsigned Flags;
MatchTableRecord(Optional<unsigned> LabelID_, StringRef EmitStr,
unsigned NumElements, unsigned Flags)
: LabelID(LabelID_.hasValue() ? LabelID_.getValue() : ~0u),
EmitStr(EmitStr), NumElements(NumElements), Flags(Flags) {
assert((!LabelID_.hasValue() || LabelID != ~0u) &&
"This value is reserved for non-labels");
}
void emit(raw_ostream &OS, bool LineBreakNextAfterThis,
const MatchTable &Table) const;
unsigned size() const { return NumElements; }
};
/// Holds the contents of a generated MatchTable to enable formatting and the
/// necessary index tracking needed to support GIM_Try.
class MatchTable {
/// An unique identifier for the table. The generated table will be named
/// MatchTable${ID}.
unsigned ID;
/// The records that make up the table. Also includes comments describing the
/// values being emitted and line breaks to format it.
std::vector<MatchTableRecord> Contents;
/// The currently defined labels.
DenseMap<unsigned, unsigned> LabelMap;
/// Tracks the sum of MatchTableRecord::NumElements as the table is built.
unsigned CurrentSize;
/// A unique identifier for a MatchTable label.
static unsigned CurrentLabelID;
public:
static MatchTableRecord LineBreak;
static MatchTableRecord Comment(StringRef Comment) {
return MatchTableRecord(None, Comment, 0, MatchTableRecord::MTRF_Comment);
}
static MatchTableRecord Opcode(StringRef Opcode, int IndentAdjust = 0) {
unsigned ExtraFlags = 0;
if (IndentAdjust > 0)
ExtraFlags |= MatchTableRecord::MTRF_Indent;
if (IndentAdjust < 0)
ExtraFlags |= MatchTableRecord::MTRF_Outdent;
return MatchTableRecord(None, Opcode, 1,
MatchTableRecord::MTRF_CommaFollows | ExtraFlags);
}
static MatchTableRecord NamedValue(StringRef NamedValue) {
return MatchTableRecord(None, NamedValue, 1,
MatchTableRecord::MTRF_CommaFollows);
}
static MatchTableRecord NamedValue(StringRef Namespace,
StringRef NamedValue) {
return MatchTableRecord(None, (Namespace + "::" + NamedValue).str(), 1,
MatchTableRecord::MTRF_CommaFollows);
}
static MatchTableRecord IntValue(int64_t IntValue) {
return MatchTableRecord(None, llvm::to_string(IntValue), 1,
MatchTableRecord::MTRF_CommaFollows);
}
static MatchTableRecord Label(unsigned LabelID) {
return MatchTableRecord(LabelID, "Label " + llvm::to_string(LabelID), 0,
MatchTableRecord::MTRF_Label |
MatchTableRecord::MTRF_Comment |
MatchTableRecord::MTRF_LineBreakFollows);
}
static MatchTableRecord JumpTarget(unsigned LabelID) {
return MatchTableRecord(LabelID, "Label " + llvm::to_string(LabelID), 1,
MatchTableRecord::MTRF_JumpTarget |
MatchTableRecord::MTRF_Comment |
MatchTableRecord::MTRF_CommaFollows);
}
MatchTable(unsigned ID) : ID(ID), CurrentSize(0) {}
void push_back(const MatchTableRecord &Value) {
if (Value.Flags & MatchTableRecord::MTRF_Label)
defineLabel(Value.LabelID);
Contents.push_back(Value);
CurrentSize += Value.size();
}
unsigned allocateLabelID() const { return CurrentLabelID++; }
void defineLabel(unsigned LabelID) {
LabelMap.insert(std::make_pair(LabelID, CurrentSize));
}
unsigned getLabelIndex(unsigned LabelID) const {
const auto I = LabelMap.find(LabelID);
assert(I != LabelMap.end() && "Use of undeclared label");
return I->second;
}
void emitUse(raw_ostream &OS) const { OS << "MatchTable" << ID; }
void emitDeclaration(raw_ostream &OS) const {
unsigned Indentation = 4;
OS << " constexpr static int64_t MatchTable" << ID << "[] = {";
LineBreak.emit(OS, true, *this);
OS << std::string(Indentation, ' ');
for (auto I = Contents.begin(), E = Contents.end(); I != E;
++I) {
bool LineBreakIsNext = false;
const auto &NextI = std::next(I);
if (NextI != E) {
if (NextI->EmitStr == "" &&
NextI->Flags == MatchTableRecord::MTRF_LineBreakFollows)
LineBreakIsNext = true;
}
if (I->Flags & MatchTableRecord::MTRF_Indent)
Indentation += 2;
I->emit(OS, LineBreakIsNext, *this);
if (I->Flags & MatchTableRecord::MTRF_LineBreakFollows)
OS << std::string(Indentation, ' ');
if (I->Flags & MatchTableRecord::MTRF_Outdent)
Indentation -= 2;
}
OS << "};\n";
}
};
unsigned MatchTable::CurrentLabelID = 0;
MatchTableRecord MatchTable::LineBreak = {
None, "" /* Emit String */, 0 /* Elements */,
MatchTableRecord::MTRF_LineBreakFollows};
void MatchTableRecord::emit(raw_ostream &OS, bool LineBreakIsNextAfterThis,
const MatchTable &Table) const {
bool UseLineComment =
LineBreakIsNextAfterThis | (Flags & MTRF_LineBreakFollows);
if (Flags & (MTRF_JumpTarget | MTRF_CommaFollows))
UseLineComment = false;
if (Flags & MTRF_Comment)
OS << (UseLineComment ? "// " : "/*");
OS << EmitStr;
if (Flags & MTRF_Label)
OS << ": @" << Table.getLabelIndex(LabelID);
if (Flags & MTRF_Comment && !UseLineComment)
OS << "*/";
if (Flags & MTRF_JumpTarget) {
if (Flags & MTRF_Comment)
OS << " ";
OS << Table.getLabelIndex(LabelID);
}
if (Flags & MTRF_CommaFollows) {
OS << ",";
if (!LineBreakIsNextAfterThis && !(Flags & MTRF_LineBreakFollows))
OS << " ";
}
if (Flags & MTRF_LineBreakFollows)
OS << "\n";
}
MatchTable &operator<<(MatchTable &Table, const MatchTableRecord &Value) {
Table.push_back(Value);
return Table;
}
//===- Matchers -----------------------------------------------------------===//
class OperandMatcher;
class MatchAction;
class PredicateMatcher;
class RuleMatcher;
class Matcher {
public:
virtual ~Matcher() = default;
virtual void emit(MatchTable &Table) = 0;
virtual std::unique_ptr<PredicateMatcher> forgetFirstCondition() = 0;
};
class GroupMatcher : public Matcher {
SmallVector<std::unique_ptr<PredicateMatcher>, 8> Conditions;
SmallVector<Matcher *, 8> Rules;
public:
void addCondition(std::unique_ptr<PredicateMatcher> &&Predicate) {
Conditions.emplace_back(std::move(Predicate));
}
void addRule(Matcher &Rule) { Rules.push_back(&Rule); }
const std::unique_ptr<PredicateMatcher> &conditions_back() const {
return Conditions.back();
}
bool lastConditionMatches(const PredicateMatcher &Predicate) const;
bool conditions_empty() const { return Conditions.empty(); }
void clear() {
Conditions.clear();
Rules.clear();
}
void emit(MatchTable &Table) override;
std::unique_ptr<PredicateMatcher> forgetFirstCondition() override {
// We shouldn't need to mess up with groups, since we
// should have merged everything shareable upfront.
// If we start to look into reordering predicates,
// we may want to reconsider this.
assert(0 && "Groups should be formed maximal for now");
llvm_unreachable("No need for this for now");
}
};
/// Generates code to check that a match rule matches.
class RuleMatcher : public Matcher {
public:
using ActionVec = std::vector<std::unique_ptr<MatchAction>>;
using action_iterator = ActionVec::iterator;
protected:
/// A list of matchers that all need to succeed for the current rule to match.
/// FIXME: This currently supports a single match position but could be
/// extended to support multiple positions to support div/rem fusion or
/// load-multiple instructions.
std::vector<std::unique_ptr<InstructionMatcher>> Matchers;
/// A list of actions that need to be taken when all predicates in this rule
/// have succeeded.
ActionVec Actions;
using DefinedInsnVariablesMap =
std::map<const InstructionMatcher *, unsigned>;
/// A map of instruction matchers to the local variables created by
/// emitCaptureOpcodes().
DefinedInsnVariablesMap InsnVariableIDs;
using MutatableInsnSet = SmallPtrSet<const InstructionMatcher *, 4>;
// The set of instruction matchers that have not yet been claimed for mutation
// by a BuildMI.
MutatableInsnSet MutatableInsns;
/// A map of named operands defined by the matchers that may be referenced by
/// the renderers.
StringMap<OperandMatcher *> DefinedOperands;
/// ID for the next instruction variable defined with defineInsnVar()
unsigned NextInsnVarID;
/// ID for the next output instruction allocated with allocateOutputInsnID()
unsigned NextOutputInsnID;
/// ID for the next temporary register ID allocated with allocateTempRegID()
unsigned NextTempRegID;
std::vector<Record *> RequiredFeatures;
ArrayRef<SMLoc> SrcLoc;
typedef std::tuple<Record *, unsigned, unsigned>
DefinedComplexPatternSubOperand;
typedef StringMap<DefinedComplexPatternSubOperand>
DefinedComplexPatternSubOperandMap;
/// A map of Symbolic Names to ComplexPattern sub-operands.
DefinedComplexPatternSubOperandMap ComplexSubOperands;
uint64_t RuleID;
static uint64_t NextRuleID;
public:
RuleMatcher(ArrayRef<SMLoc> SrcLoc)
: Matchers(), Actions(), InsnVariableIDs(), MutatableInsns(),
DefinedOperands(), NextInsnVarID(0), NextOutputInsnID(0),
NextTempRegID(0), SrcLoc(SrcLoc), ComplexSubOperands(),
RuleID(NextRuleID++) {}
RuleMatcher(RuleMatcher &&Other) = default;
RuleMatcher &operator=(RuleMatcher &&Other) = default;
uint64_t getRuleID() const { return RuleID; }
InstructionMatcher &addInstructionMatcher(StringRef SymbolicName);
void addRequiredFeature(Record *Feature);
const std::vector<Record *> &getRequiredFeatures() const;
template <class Kind, class... Args> Kind &addAction(Args &&... args);
template <class Kind, class... Args>
action_iterator insertAction(action_iterator InsertPt, Args &&... args);
/// Define an instruction without emitting any code to do so.
/// This is used for the root of the match.
unsigned implicitlyDefineInsnVar(const InstructionMatcher &Matcher);
void clearImplicitMap() {
NextInsnVarID = 0;
InsnVariableIDs.clear();
};
/// Define an instruction and emit corresponding state-machine opcodes.
unsigned defineInsnVar(MatchTable &Table, const InstructionMatcher &Matcher,
unsigned InsnVarID, unsigned OpIdx);
unsigned getInsnVarID(const InstructionMatcher &InsnMatcher) const;
DefinedInsnVariablesMap::const_iterator defined_insn_vars_begin() const {
return InsnVariableIDs.begin();
}
DefinedInsnVariablesMap::const_iterator defined_insn_vars_end() const {
return InsnVariableIDs.end();
}
iterator_range<typename DefinedInsnVariablesMap::const_iterator>
defined_insn_vars() const {
return make_range(defined_insn_vars_begin(), defined_insn_vars_end());
}
MutatableInsnSet::const_iterator mutatable_insns_begin() const {
return MutatableInsns.begin();
}
MutatableInsnSet::const_iterator mutatable_insns_end() const {
return MutatableInsns.end();
}
iterator_range<typename MutatableInsnSet::const_iterator>
mutatable_insns() const {
return make_range(mutatable_insns_begin(), mutatable_insns_end());
}
void reserveInsnMatcherForMutation(const InstructionMatcher *InsnMatcher) {
bool R = MutatableInsns.erase(InsnMatcher);
assert(R && "Reserving a mutatable insn that isn't available");
(void)R;
}
action_iterator actions_begin() { return Actions.begin(); }
action_iterator actions_end() { return Actions.end(); }
iterator_range<action_iterator> actions() {
return make_range(actions_begin(), actions_end());
}
void defineOperand(StringRef SymbolicName, OperandMatcher &OM);
void defineComplexSubOperand(StringRef SymbolicName, Record *ComplexPattern,
unsigned RendererID, unsigned SubOperandID) {
assert(ComplexSubOperands.count(SymbolicName) == 0 && "Already defined");
ComplexSubOperands[SymbolicName] =
std::make_tuple(ComplexPattern, RendererID, SubOperandID);
}
Optional<DefinedComplexPatternSubOperand>
getComplexSubOperand(StringRef SymbolicName) const {
const auto &I = ComplexSubOperands.find(SymbolicName);
if (I == ComplexSubOperands.end())
return None;
return I->second;
}
const InstructionMatcher &getInstructionMatcher(StringRef SymbolicName) const;
const OperandMatcher &getOperandMatcher(StringRef Name) const;
void emitCaptureOpcodes(MatchTable &Table);
void emit(MatchTable &Table) override;
/// Compare the priority of this object and B.
///
/// Returns true if this object is more important than B.
bool isHigherPriorityThan(const RuleMatcher &B) const;
/// Report the maximum number of temporary operands needed by the rule
/// matcher.
unsigned countRendererFns() const;
std::unique_ptr<PredicateMatcher> forgetFirstCondition() override;
// FIXME: Remove this as soon as possible
InstructionMatcher &insnmatchers_front() const { return *Matchers.front(); }
unsigned allocateOutputInsnID() { return NextOutputInsnID++; }
unsigned allocateTempRegID() { return NextTempRegID++; }
bool insnmatchers_empty() const { return Matchers.empty(); }
void insnmatchers_pop_front() { Matchers.erase(Matchers.begin()); }
};
uint64_t RuleMatcher::NextRuleID = 0;
using action_iterator = RuleMatcher::action_iterator;
template <class PredicateTy> class PredicateListMatcher {
private:
typedef std::vector<std::unique_ptr<PredicateTy>> PredicateVec;
PredicateVec Predicates;
/// Template instantiations should specialize this to return a string to use
/// for the comment emitted when there are no predicates.
std::string getNoPredicateComment() const;
public:
/// Construct a new operand predicate and add it to the matcher.
template <class Kind, class... Args>
Optional<Kind *> addPredicate(Args&&... args) {
Predicates.emplace_back(
llvm::make_unique<Kind>(std::forward<Args>(args)...));
return static_cast<Kind *>(Predicates.back().get());
}
typename PredicateVec::const_iterator predicates_begin() const {
return Predicates.begin();
}
typename PredicateVec::const_iterator predicates_end() const {
return Predicates.end();
}
iterator_range<typename PredicateVec::const_iterator> predicates() const {
return make_range(predicates_begin(), predicates_end());
}
typename PredicateVec::size_type predicates_size() const {
return Predicates.size();
}
bool predicates_empty() const { return Predicates.empty(); }
std::unique_ptr<PredicateTy> predicates_pop_front() {
std::unique_ptr<PredicateTy> Front = std::move(Predicates.front());
Predicates.erase(Predicates.begin());
return Front;
}
/// Emit MatchTable opcodes that tests whether all the predicates are met.
template <class... Args>
void emitPredicateListOpcodes(MatchTable &Table, Args &&... args) const {
if (Predicates.empty()) {
Table << MatchTable::Comment(getNoPredicateComment())
<< MatchTable::LineBreak;
return;
}
unsigned OpIdx = (*predicates_begin())->getOpIdx();
(void)OpIdx;
for (const auto &Predicate : predicates()) {
assert(Predicate->getOpIdx() == OpIdx &&
"Checks touch different operands?");
Predicate->emitPredicateOpcodes(Table, std::forward<Args>(args)...);
}
}
};
class PredicateMatcher {
public:
/// This enum is used for RTTI and also defines the priority that is given to
/// the predicate when generating the matcher code. Kinds with higher priority
/// must be tested first.
///
/// The relative priority of OPM_LLT, OPM_RegBank, and OPM_MBB do not matter
/// but OPM_Int must have priority over OPM_RegBank since constant integers
/// are represented by a virtual register defined by a G_CONSTANT instruction.
///
/// Note: The relative priority between IPM_ and OPM_ does not matter, they
/// are currently not compared between each other.
enum PredicateKind {
IPM_Opcode,
IPM_ImmPredicate,
IPM_AtomicOrderingMMO,
OPM_SameOperand,
OPM_ComplexPattern,
OPM_IntrinsicID,
OPM_Instruction,
OPM_Int,
OPM_LiteralInt,
OPM_LLT,
OPM_PointerToAny,
OPM_RegBank,
OPM_MBB,
};
protected:
PredicateKind Kind;
unsigned InsnVarID;
unsigned OpIdx;
public:
PredicateMatcher(PredicateKind Kind, unsigned InsnVarID, unsigned OpIdx = ~0)
: Kind(Kind), InsnVarID(InsnVarID), OpIdx(OpIdx) {}
unsigned getOpIdx() const { return OpIdx; }
virtual ~PredicateMatcher() = default;
/// Emit MatchTable opcodes that check the predicate for the given operand.
virtual void emitPredicateOpcodes(MatchTable &Table,
RuleMatcher &Rule) const = 0;
PredicateKind getKind() const { return Kind; }
virtual bool isIdentical(const PredicateMatcher &B) const {
if (InsnVarID != 0 || OpIdx != (unsigned)~0) {
// We currently don't hoist the record of instruction properly.
// Therefore we can only work on the orig instruction (InsnVarID
// == 0).
DEBUG(dbgs() << "Non-zero instr ID not supported yet\n");
return false;
}
return B.getKind() == getKind() && InsnVarID == B.InsnVarID &&
OpIdx == B.OpIdx;
}
};
/// Generates code to check a predicate of an operand.
///
/// Typical predicates include:
/// * Operand is a particular register.
/// * Operand is assigned a particular register bank.
/// * Operand is an MBB.
class OperandPredicateMatcher : public PredicateMatcher {
public:
OperandPredicateMatcher(PredicateKind Kind, unsigned InsnVarID,
unsigned OpIdx)
: PredicateMatcher(Kind, InsnVarID, OpIdx) {}
virtual ~OperandPredicateMatcher() {}
/// Emit MatchTable opcodes to capture instructions into the MIs table.
///
/// Only InstructionOperandMatcher needs to do anything for this method the
/// rest just walk the tree.
virtual void emitCaptureOpcodes(MatchTable &Table, RuleMatcher &Rule) const {}
/// Compare the priority of this object and B.
///
/// Returns true if this object is more important than B.
virtual bool isHigherPriorityThan(const OperandPredicateMatcher &B) const;
/// Report the maximum number of temporary operands needed by the predicate
/// matcher.
virtual unsigned countRendererFns() const { return 0; }
};
template <>
std::string
PredicateListMatcher<OperandPredicateMatcher>::getNoPredicateComment() const {
return "No operand predicates";
}
/// Generates code to check that a register operand is defined by the same exact
/// one as another.
class SameOperandMatcher : public OperandPredicateMatcher {
std::string MatchingName;
public:
SameOperandMatcher(unsigned InsnVarID, unsigned OpIdx, StringRef MatchingName)
: OperandPredicateMatcher(OPM_SameOperand, InsnVarID, OpIdx),
MatchingName(MatchingName) {}
static bool classof(const OperandPredicateMatcher *P) {
return P->getKind() == OPM_SameOperand;
}
void emitPredicateOpcodes(MatchTable &Table,
RuleMatcher &Rule) const override;
};
/// Generates code to check that an operand is a particular LLT.
class LLTOperandMatcher : public OperandPredicateMatcher {
protected:
LLTCodeGen Ty;
public:
static std::set<LLTCodeGen> KnownTypes;
LLTOperandMatcher(unsigned InsnVarID, unsigned OpIdx, const LLTCodeGen &Ty)
: OperandPredicateMatcher(OPM_LLT, InsnVarID, OpIdx), Ty(Ty) {
KnownTypes.insert(Ty);
}
static bool classof(const PredicateMatcher *P) {
return P->getKind() == OPM_LLT;
}
bool isIdentical(const PredicateMatcher &B) const override {
return OperandPredicateMatcher::isIdentical(B) &&
Ty == cast<LLTOperandMatcher>(&B)->Ty;
}
void emitPredicateOpcodes(MatchTable &Table,
RuleMatcher &Rule) const override {
Table << MatchTable::Opcode("GIM_CheckType") << MatchTable::Comment("MI")
<< MatchTable::IntValue(InsnVarID) << MatchTable::Comment("Op")
<< MatchTable::IntValue(OpIdx) << MatchTable::Comment("Type")
<< MatchTable::NamedValue(Ty.getCxxEnumValue())
<< MatchTable::LineBreak;
}
};
std::set<LLTCodeGen> LLTOperandMatcher::KnownTypes;
/// Generates code to check that an operand is a pointer to any address space.
///
/// In SelectionDAG, the types did not describe pointers or address spaces. As a
/// result, iN is used to describe a pointer of N bits to any address space and
/// PatFrag predicates are typically used to constrain the address space. There's
/// no reliable means to derive the missing type information from the pattern so
/// imported rules must test the components of a pointer separately.
///
/// If SizeInBits is zero, then the pointer size will be obtained from the
/// subtarget.
class PointerToAnyOperandMatcher : public OperandPredicateMatcher {
protected:
unsigned SizeInBits;
public:
PointerToAnyOperandMatcher(unsigned InsnVarID, unsigned OpIdx,
unsigned SizeInBits)
: OperandPredicateMatcher(OPM_PointerToAny, InsnVarID, OpIdx),
SizeInBits(SizeInBits) {}
static bool classof(const OperandPredicateMatcher *P) {
return P->getKind() == OPM_PointerToAny;