void processInstruction(MachineInstr *MI) { for (unsigned i = 0; i < MI->getNumOperands(); ++i) { MachineOperand &MO = MI->getOperand(i); if (MO.isReg() && MO.isDef()) { // This operand is a defined register RegisterDefInfo *RDI = getRegisterDefInfo(MO.getReg()); if (RDI != NULL) { // Update RDI with the instruction that defines it RDI->defInst = MI; } } } }This code processes a machine instruction and updates information about register definitions. The isDef method is used to identify the registers that are defined by the instruction. This code example is part of the LLVM project, which is a collection of libraries and tools for building compilers and other programming tools. Therefore, the package library would be LLVM.