+namespace {
+class PseudoLoweringEmitter {
+ struct OpData {
+ enum MapKind { Operand, Imm, Reg };
+ MapKind Kind;
+ union {
+ unsigned Operand; // Operand number mapped to.
+ uint64_t Imm; // Integer immedate value.
+ Record *Reg; // Physical register.
+ } Data;
+ };
+ struct PseudoExpansion {
+ CodeGenInstruction Source; // The source pseudo instruction definition.
+ CodeGenInstruction Dest; // The destination instruction to lower to.
+ IndexedMap<OpData> OperandMap;
+
+ PseudoExpansion(CodeGenInstruction &s, CodeGenInstruction &d,
+ IndexedMap<OpData> &m) :
+ Source(s), Dest(d), OperandMap(m) {}
+ };
+
+ RecordKeeper &Records;
+
+ // It's overkill to have an instance of the full CodeGenTarget object,
+ // but it loads everything on demand, not in the constructor, so it's
+ // lightweight in performance, so it works out OK.
+ CodeGenTarget Target;
+
+ SmallVector<PseudoExpansion, 64> Expansions;
+
+ unsigned addDagOperandMapping(Record *Rec, DagInit *Dag,
+ CodeGenInstruction &Insn,
+ IndexedMap<OpData> &OperandMap,
+ unsigned BaseIdx);
+ void evaluateExpansion(Record *Pseudo);
+ void emitLoweringEmitter(raw_ostream &o);
+public:
+ PseudoLoweringEmitter(RecordKeeper &R) : Records(R), Target(R) {}
+
+ /// run - Output the pseudo-lowerings.
+ void run(raw_ostream &o);
+};
+} // End anonymous namespace
+