ReplaceUsesOfBlockWith() can modify the predecessors list.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37441 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/IfConversion.cpp b/lib/CodeGen/IfConversion.cpp
index 9a35d1d..e06fb26 100644
--- a/lib/CodeGen/IfConversion.cpp
+++ b/lib/CodeGen/IfConversion.cpp
@@ -756,9 +756,10 @@
ToBBI.BB->removeSuccessor(FromBBI.BB);
// Redirect all branches to FromBB to ToBB.
- for (MachineBasicBlock::pred_iterator I = FromBBI.BB->pred_begin(),
- E = FromBBI.BB->pred_end(); I != E; ++I)
- (*I)->ReplaceUsesOfBlockWith(FromBBI.BB, ToBBI.BB);
+ std::vector<MachineBasicBlock *> Preds(FromBBI.BB->pred_begin(),
+ FromBBI.BB->pred_end());
+ for (unsigned i = 0, e = Preds.size(); i != e; ++i)
+ Preds[i]->ReplaceUsesOfBlockWith(FromBBI.BB, ToBBI.BB);
// Transfer preds / succs and update size.
TransferPreds(ToBBI.BB, FromBBI.BB);