// Start with no live registers.
LiveRegs.reset();
- // Determine the live-out physregs for this block.
- if (!BB->empty() && BB->back().isReturn()) {
- // In a return block, examine the function live-out regs.
- for (MachineRegisterInfo::liveout_iterator I = MRI.liveout_begin(),
- E = MRI.liveout_end(); I != E; ++I) {
+ // Examine the live-in regs of all successors.
+ for (MachineBasicBlock::succ_iterator SI = BB->succ_begin(),
+ SE = BB->succ_end(); SI != SE; ++SI) {
+ for (MachineBasicBlock::livein_iterator I = (*SI)->livein_begin(),
+ E = (*SI)->livein_end(); I != E; ++I) {
unsigned Reg = *I;
LiveRegs.set(Reg);
// Repeat, for all subregs.
LiveRegs.set(*SubRegs);
}
}
- else {
- // In a non-return block, examine the live-in regs of all successors.
- for (MachineBasicBlock::succ_iterator SI = BB->succ_begin(),
- SE = BB->succ_end(); SI != SE; ++SI) {
- for (MachineBasicBlock::livein_iterator I = (*SI)->livein_begin(),
- E = (*SI)->livein_end(); I != E; ++I) {
- unsigned Reg = *I;
- LiveRegs.set(Reg);
- // Repeat, for all subregs.
- for (MCSubRegIterator SubRegs(Reg, TRI); SubRegs.isValid(); ++SubRegs)
- LiveRegs.set(*SubRegs);
- }
- }
- }
}
bool SchedulePostRATDList::ToggleKillFlag(MachineInstr *MI,