Not all entries in the range will have an SUnit. Check for that when looking
for debug information.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105324 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AggressiveAntiDepBreaker.cpp b/lib/CodeGen/AggressiveAntiDepBreaker.cpp
index 84b226b..727e8f9 100644
--- a/lib/CodeGen/AggressiveAntiDepBreaker.cpp
+++ b/lib/CodeGen/AggressiveAntiDepBreaker.cpp
@@ -909,6 +909,7 @@
// information related to the anti-dependency register, make
// sure to update that as well.
const SUnit *SU = MISUnitMap[Q->second.Operand->getParent()];
+ if (!SU) continue;
for (unsigned i = 0, e = SU->DbgInstrList.size() ; i < e ; ++i) {
MachineInstr *DI = SU->DbgInstrList[i];
assert (DI->getNumOperands()==3 && DI->getOperand(0).isReg() &&