misched: fix LI update for bottom-up.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153158 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 70ed1c3..1019ad2 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -1319,8 +1319,14 @@
void moveEnteringDownFrom(SlotIndex OldIdx, IntRangePair& P) {
LiveInterval* LI = P.first;
LiveRange* LR = P.second;
+ // Extend the LiveRange if NewIdx is past the end.
if (NewIdx > LR->end) {
- moveKillFlags(LI->reg, LR->end, NewIdx);
+ // Move kill flags if OldIdx was not originally the end
+ // (otherwise LR->end points to an invalid slot).
+ if (LR->end.getRegSlot() != OldIdx.getRegSlot()) {
+ assert(LR->end > OldIdx && "LiveRange does not cover original slot");
+ moveKillFlags(LI->reg, LR->end, NewIdx);
+ }
LR->end = NewIdx.getRegSlot();
}
}