diff --git a/lib/CodeGen/InlineSpiller.cpp b/lib/CodeGen/InlineSpiller.cpp
index 59a92890f5a..9989f233d09 100644
--- a/lib/CodeGen/InlineSpiller.cpp
+++ b/lib/CodeGen/InlineSpiller.cpp
@@ -921,7 +921,7 @@ bool InlineSpiller::reMaterializeFor(LiveInterval &VirtReg,
 
   // Replace operands
   for (unsigned i = 0, e = Ops.size(); i != e; ++i) {
-    MachineOperand &MO = MI->getOperand(Ops[i].second);
+    MachineOperand &MO = Ops[i].first->getOperand(Ops[i].second);
     if (MO.isReg() && MO.isUse() && MO.getReg() == VirtReg.reg) {
       MO.setReg(NewVReg);
       MO.setIsKill();
@@ -1100,6 +1100,7 @@ foldMemoryOperand(ArrayRef<std::pair<MachineInstr*, unsigned> > Ops,
   SmallVector<unsigned, 8> FoldOps;
   for (unsigned i = 0, e = Ops.size(); i != e; ++i) {
     unsigned Idx = Ops[i].second;
+    assert(MI == Ops[i].first && "Instruction conflict during operand folding");
     MachineOperand &MO = MI->getOperand(Idx);
     if (MO.isImplicit()) {
       ImpReg = MO.getReg();