diff --git a/llvm/lib/CodeGen/EarlyIfConversion.cpp b/llvm/lib/CodeGen/EarlyIfConversion.cpp
--- a/llvm/lib/CodeGen/EarlyIfConversion.cpp
+++ b/llvm/lib/CodeGen/EarlyIfConversion.cpp
@@ -344,7 +344,8 @@
 void SSAIfConv::PredicateBlock(MachineBasicBlock *MBB, bool ReversePredicate) {
   auto Condition = Cond;
   if (ReversePredicate)
-    TII->reverseBranchCondition(Condition);
+    assert(!TII->reverseBranchCondition(Condition) &&
+           "Reverse predicate is not supported");
   // Terminators don't need to be predicated as they will be removed.
   for (MachineBasicBlock::iterator I = MBB->begin(),
                                    E = MBB->getFirstTerminator();