+ Instruction *New = nullptr;
+ switch (getOpcode()) {
+ default:
+ llvm_unreachable("Unhandled Opcode.");
+#define HANDLE_INST(num, opc, clas) \
+ case Instruction::opc: \
+ New = cast<clas>(this)->cloneImpl(); \
+ break;
+#include "llvm/IR/Instruction.def"
+#undef HANDLE_INST
+ }
+