- // Finally, if the last instruction in the block is a return, make sure to
- // mark it as using all of the live-out values in the function.
- // Things marked both call and return are tail calls; do not do this for
- // them. The tail callee need not take the same registers as input
- // that it produces as output, and there are dependencies for its input
- // registers elsewhere.
- if (!MBB->empty() && MBB->back().isReturn()
- && !MBB->back().isCall()) {
- MachineInstr *Ret = &MBB->back();
-
- for (MachineRegisterInfo::liveout_iterator
- I = MF->getRegInfo().liveout_begin(),
- E = MF->getRegInfo().liveout_end(); I != E; ++I) {
- assert(TargetRegisterInfo::isPhysicalRegister(*I) &&
- "Cannot have a live-out virtual register!");
- HandlePhysRegUse(*I, Ret);
-
- // Add live-out registers as implicit uses.
- if (!Ret->readsRegister(*I))
- Ret->addOperand(MachineOperand::CreateReg(*I, false, true));
- }
- }
-