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//===- SubtargetFeatureInfo.cpp - Helpers for subtarget features ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "SubtargetFeatureInfo.h"
#include "Types.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/TableGen/Record.h"
#include <map>
using namespace llvm;
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void SubtargetFeatureInfo::dump() const {
errs() << getEnumName() << " " << Index << "\n" << *TheDef;
}
#endif
std::vector<std::pair<Record *, SubtargetFeatureInfo>>
SubtargetFeatureInfo::getAll(const RecordKeeper &Records) {
std::vector<std::pair<Record *, SubtargetFeatureInfo>> SubtargetFeatures;
std::vector<Record *> AllPredicates =
Records.getAllDerivedDefinitions("Predicate");
for (Record *Pred : AllPredicates) {
// Ignore predicates that are not intended for the assembler.
//
// The "AssemblerMatcherPredicate" string should be promoted to an argument
// if we re-use the machinery for non-assembler purposes in future.
if (!Pred->getValueAsBit("AssemblerMatcherPredicate"))
continue;
if (Pred->getName().empty())
PrintFatalError(Pred->getLoc(), "Predicate has no name!");
SubtargetFeatures.emplace_back(
Pred, SubtargetFeatureInfo(Pred, SubtargetFeatures.size()));
}
return SubtargetFeatures;
}
void SubtargetFeatureInfo::emitSubtargetFeatureFlagEnumeration(
SubtargetFeatureInfoMap &SubtargetFeatures, raw_ostream &OS) {
OS << "// Flags for subtarget features that participate in "
<< "instruction matching.\n";
OS << "enum SubtargetFeatureFlag : "
<< getMinimalTypeForEnumBitfield(SubtargetFeatures.size()) << " {\n";
for (const auto &SF : SubtargetFeatures) {
const SubtargetFeatureInfo &SFI = SF.second;
OS << " " << SFI.getEnumName() << " = (1ULL << " << SFI.Index << "),\n";
}
OS << " Feature_None = 0\n";
OS << "};\n\n";
}
void SubtargetFeatureInfo::emitSubtargetFeatureBitEnumeration(
SubtargetFeatureInfoMap &SubtargetFeatures, raw_ostream &OS) {
OS << "// Bits for subtarget features that participate in "
<< "instruction matching.\n";
OS << "enum SubtargetFeatureBits : "
<< getMinimalTypeForRange(SubtargetFeatures.size()) << " {\n";
for (const auto &SF : SubtargetFeatures) {
const SubtargetFeatureInfo &SFI = SF.second;
OS << " " << SFI.getEnumBitName() << " = " << SFI.Index << ",\n";
}
OS << "};\n\n";
}
void SubtargetFeatureInfo::emitNameTable(
SubtargetFeatureInfoMap &SubtargetFeatures, raw_ostream &OS) {
// Need to sort the name table so that lookup by the log of the enum value
// gives the proper name. More specifically, for a feature of value 1<<n,
// SubtargetFeatureNames[n] should be the name of the feature.
uint64_t IndexUB = 0;
for (const auto &SF : SubtargetFeatures)
if (IndexUB <= SF.second.Index)
IndexUB = SF.second.Index+1;
std::vector<std::string> Names;
if (IndexUB > 0)
Names.resize(IndexUB);
for (const auto &SF : SubtargetFeatures)
Names[SF.second.Index] = SF.second.getEnumName();
OS << "static const char *SubtargetFeatureNames[] = {\n";
for (uint64_t I = 0; I < IndexUB; ++I)
OS << " \"" << Names[I] << "\",\n";
// A small number of targets have no predicates. Null terminate the array to
// avoid a zero-length array.
OS << " nullptr\n"
<< "};\n\n";
}
void SubtargetFeatureInfo::emitComputeAvailableFeatures(
StringRef TargetName, StringRef ClassName, StringRef FuncName,
SubtargetFeatureInfoMap &SubtargetFeatures, raw_ostream &OS,
StringRef ExtraParams) {
OS << "PredicateBitset " << TargetName << ClassName << "::\n"
<< FuncName << "(const " << TargetName << "Subtarget *Subtarget";
if (!ExtraParams.empty())
OS << ", " << ExtraParams;
OS << ") const {\n";
OS << " PredicateBitset Features;\n";
for (const auto &SF : SubtargetFeatures) {
const SubtargetFeatureInfo &SFI = SF.second;
OS << " if (" << SFI.TheDef->getValueAsString("CondString") << ")\n";
OS << " Features[" << SFI.getEnumBitName() << "] = 1;\n";
}
OS << " return Features;\n";
OS << "}\n\n";
}
void SubtargetFeatureInfo::emitComputeAssemblerAvailableFeatures(
StringRef TargetName, StringRef ClassName, StringRef FuncName,
SubtargetFeatureInfoMap &SubtargetFeatures, raw_ostream &OS) {
OS << "uint64_t " << TargetName << ClassName << "::\n"
<< FuncName << "(const FeatureBitset& FB) const {\n";
OS << " uint64_t Features = 0;\n";
for (const auto &SF : SubtargetFeatures) {
const SubtargetFeatureInfo &SFI = SF.second;
OS << " if (";
std::string CondStorage =
SFI.TheDef->getValueAsString("AssemblerCondString");
StringRef Conds = CondStorage;
std::pair<StringRef, StringRef> Comma = Conds.split(',');
bool First = true;
do {
if (!First)
OS << " && ";
bool Neg = false;
StringRef Cond = Comma.first;
if (Cond[0] == '!') {
Neg = true;
Cond = Cond.substr(1);
}
OS << "(";
if (Neg)
OS << "!";
OS << "FB[" << TargetName << "::" << Cond << "])";
if (Comma.second.empty())
break;
First = false;
Comma = Comma.second.split(',');
} while (true);
OS << ")\n";
OS << " Features |= " << SFI.getEnumName() << ";\n";
}
OS << " return Features;\n";
OS << "}\n\n";
}
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