let isCodeGenOnly = 1;
}
-def TruePredicate : Predicate<"true">;
+def TruePredicate : Predicate<"">;
class PredicateControl {
Predicate SubtargetPredicate = TruePredicate;
///
std::string PatternToMatch::getPredicateCheck() const {
SmallVector<const Predicate*,4> PredList;
- for (const Predicate &P : Predicates)
- PredList.push_back(&P);
+ for (const Predicate &P : Predicates) {
+ if (!P.getCondString().empty())
+ PredList.push_back(&P);
+ }
llvm::sort(PredList, deref<llvm::less>());
std::string Check;
std::string C = IsHwMode
? std::string("MF->getSubtarget().checkFeatures(\"" + Features + "\")")
: std::string(Def->getValueAsString("CondString"));
+ if (C.empty())
+ return "";
return IfCond ? C : "!("+C+')';
}
+
bool operator==(const Predicate &P) const {
return IfCond == P.IfCond && IsHwMode == P.IsHwMode && Def == P.Def;
}
GlobalISelEmitter::importRulePredicates(RuleMatcher &M,
ArrayRef<Predicate> Predicates) {
for (const Predicate &P : Predicates) {
- if (!P.Def)
+ if (!P.Def || P.getCondString().empty())
continue;
declareSubtargetFeature(P.Def);
M.addRequiredFeature(P.Def);
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()));
}
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 (" << SFI.TheDef->getValueAsString("CondString") << ")\n";
+ OS << " if (" << CondStr << ")\n";
OS << " Features[" << SFI.getEnumBitName() << "] = 1;\n";
}
OS << " return Features;\n";