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//===- SubtargetFeatureInfo.cpp - Helpers for subtarget features ----------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "SubtargetFeatureInfo.h"
#include "Types.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/TableGen/Error.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!");
// Ignore always true predicates.
if (Pred->getValueAsString("CondString").empty())
continue;
SubtargetFeatures.emplace_back(
Pred, SubtargetFeatureInfo(Pred, SubtargetFeatures.size()));
}
return SubtargetFeatures;
}
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;
StringRef CondStr = SFI.TheDef->getValueAsString("CondString");
assert(!CondStr.empty() && "true predicate should have been filtered");
OS << " if (" << CondStr << ")\n";
OS << " Features.set(" << SFI.getEnumBitName() << ");\n";
}
OS << " return Features;\n";
OS << "}\n\n";
}
// If ParenIfBinOp is true, print a surrounding () if Val uses && or ||.
static bool emitFeaturesAux(StringRef TargetName, const Init &Val,
bool ParenIfBinOp, raw_ostream &OS) {
if (auto *D = dyn_cast<DefInit>(&Val)) {
if (!D->getDef()->isSubClassOf("SubtargetFeature"))
return true;
OS << "FB[" << TargetName << "::" << D->getAsString() << "]";
return false;
}
if (auto *D = dyn_cast<DagInit>(&Val)) {
std::string Op = D->getOperator()->getAsString();
if (Op == "not" && D->getNumArgs() == 1) {
OS << '!';
return emitFeaturesAux(TargetName, *D->getArg(0), true, OS);
}
if ((Op == "any_of" || Op == "all_of") && D->getNumArgs() > 0) {
bool Paren = D->getNumArgs() > 1 && std::exchange(ParenIfBinOp, true);
if (Paren)
OS << '(';
ListSeparator LS(Op == "any_of" ? " || " : " && ");
for (auto *Arg : D->getArgs()) {
OS << LS;
if (emitFeaturesAux(TargetName, *Arg, ParenIfBinOp, OS))
return true;
}
if (Paren)
OS << ')';
return false;
}
}
return true;
}
void SubtargetFeatureInfo::emitComputeAssemblerAvailableFeatures(
StringRef TargetName, StringRef ClassName, StringRef FuncName,
SubtargetFeatureInfoMap &SubtargetFeatures, raw_ostream &OS) {
OS << "FeatureBitset ";
if (!ClassName.empty())
OS << TargetName << ClassName << "::\n";
OS << FuncName << "(const FeatureBitset &FB) ";
if (!ClassName.empty())
OS << "const ";
OS << "{\n";
OS << " FeatureBitset Features;\n";
for (const auto &SF : SubtargetFeatures) {
const SubtargetFeatureInfo &SFI = SF.second;
OS << " if (";
emitFeaturesAux(TargetName, *SFI.TheDef->getValueAsDag("AssemblerCondDag"),
/*ParenIfBinOp=*/false, OS);
OS << ")\n";
OS << " Features.set(" << SFI.getEnumBitName() << ");\n";
}
OS << " return Features;\n";
OS << "}\n\n";
}
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