- // FIXME: This should probably be added by instruction selection instead?
- // 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().getDesc().isReturn() &&
- !MBB->back().getDesc().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.");
-
- // Add live-out registers as implicit uses.
- Ret->addRegisterKilled(*I, TRI, true);
- }
- }
-