Don't emit live ranges for physregs live-ins that are dead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150553 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2012-02-15 01:31:10 +00:00
parent da7984fbba
commit f58e37f957

View File

@ -529,9 +529,10 @@ void LiveIntervals::handleLiveInRegister(MachineBasicBlock *MBB,
if (!SeenDefUse) {
if (isAllocatable(interval.reg) || isReserved(interval.reg)) {
// This must be an entry block or landing pad - we asserted so on entry
// to the function. For these blocks the interval is dead on entry.
// to the function. For these blocks the interval is dead on entry, so
// we won't emit a live-range for it.
DEBUG(dbgs() << " dead");
end = start.getDeadSlot();
return;
} else {
assert(isRegLiveOutOf(MBB, interval.reg) &&
"Live in reg untouched in block should be be live through.");