return 0;
}
-static cl::opt<bool>
-SchedLiveInCopies("schedule-livein-copies", cl::Hidden,
- cl::desc("Schedule copies of livein registers"),
- cl::init(false));
-
/// EmitLiveInCopy - Emit a copy for a live in physical register. If the
/// physical register has only a single copy use, then coalesced the copy
/// if possible.
MachineRegisterInfo::EmitLiveInCopies(MachineBasicBlock *EntryMBB,
const TargetRegisterInfo &TRI,
const TargetInstrInfo &TII) {
- if (SchedLiveInCopies) {
- // Emit the copies at a heuristically-determined location in the block.
- DenseMap<MachineInstr*, unsigned> CopyRegMap;
- MachineBasicBlock::iterator InsertPos = EntryMBB->begin();
- for (MachineRegisterInfo::livein_iterator LI = livein_begin(),
- E = livein_end(); LI != E; ++LI)
- if (LI->second) {
- const TargetRegisterClass *RC = getRegClass(LI->second);
- EmitLiveInCopy(EntryMBB, InsertPos, LI->second, LI->first,
- RC, CopyRegMap, *this, TRI, TII);
- }
- } else {
- // Emit the copies into the top of the block.
- for (MachineRegisterInfo::livein_iterator LI = livein_begin(),
- E = livein_end(); LI != E; ++LI)
- if (LI->second) {
- const TargetRegisterClass *RC = getRegClass(LI->second);
- bool Emitted = TII.copyRegToReg(*EntryMBB, EntryMBB->begin(),
- LI->second, LI->first, RC, RC,
- DebugLoc());
- assert(Emitted && "Unable to issue a live-in copy instruction!\n");
- (void) Emitted;
- }
- }
+ // Emit the copies into the top of the block.
+ for (MachineRegisterInfo::livein_iterator LI = livein_begin(),
+ E = livein_end(); LI != E; ++LI)
+ if (LI->second) {
+ const TargetRegisterClass *RC = getRegClass(LI->second);
+ bool Emitted = TII.copyRegToReg(*EntryMBB, EntryMBB->begin(),
+ LI->second, LI->first, RC, RC,
+ DebugLoc());
+ assert(Emitted && "Unable to issue a live-in copy instruction!\n");
+ (void) Emitted;
+ }
// Add function live-ins to entry block live-in set.
for (MachineRegisterInfo::livein_iterator I = livein_begin(),
- E = livein_end(); I != E; ++I)
+ E = livein_end(); I != E; ++I)
EntryMBB->addLiveIn(I->first);
}