void GIMatchTreeOpcodePartitioner::generatePartitionSelectorCode(
raw_ostream &OS, StringRef Indent) const {
- OS << Indent << "Partition = -1;\n"
- << Indent << "switch (MIs[" << InstrID << "]->getOpcode()) {\n";
- for (const auto &EnumInstr : enumerate(PartitionToInstr)) {
- if (EnumInstr.value() == nullptr)
- OS << Indent << "default:";
- else
- OS << Indent << "case " << EnumInstr.value()->Namespace
- << "::" << EnumInstr.value()->TheDef->getName() << ":";
- OS << " Partition = " << EnumInstr.index() << "; break;\n";
+ // Make sure not to emit empty switch or switch with just default
+ if (PartitionToInstr.size() == 1 && PartitionToInstr[0] == nullptr) {
+ OS << Indent << "Partition = 0;\n";
+ } else if (PartitionToInstr.size()) {
+ OS << Indent << "Partition = -1;\n"
+ << Indent << "switch (MIs[" << InstrID << "]->getOpcode()) {\n";
+ for (const auto &EnumInstr : enumerate(PartitionToInstr)) {
+ if (EnumInstr.value() == nullptr)
+ OS << Indent << "default:";
+ else
+ OS << Indent << "case " << EnumInstr.value()->Namespace
+ << "::" << EnumInstr.value()->TheDef->getName() << ":";
+ OS << " Partition = " << EnumInstr.index() << "; break;\n";
+ }
+ OS << Indent << "}\n";
}
- OS << Indent << "}\n"
- << Indent
+ OS << Indent
<< "// Default case but without conflicting with potential default case "
"in selection.\n"
<< Indent << "if (Partition == -1) return false;\n";
OS << Indent << "if (Partition == -1) return false;\n";
}
-