Find anchoring end points for repairIntervalsInRange and repairIndexesInRange
automatically.
llvm-svn: 175673
diff --git a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
index e07922b..a716e8b 100644
--- a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -1038,6 +1038,13 @@
MachineBasicBlock::iterator Begin,
MachineBasicBlock::iterator End,
ArrayRef<unsigned> OrigRegs) {
+ // Find anchor points, which are at the beginning/end of blocks or at
+ // instructions that already have indexes.
+ while (Begin != MBB->begin() && !Indexes->hasIndex(Begin))
+ --Begin;
+ while (End != MBB->end() && !Indexes->hasIndex(End))
+ ++End;
+
SlotIndex endIdx;
if (End == MBB->end())
endIdx = getMBBEndIdx(MBB).getPrevSlot();