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
@@ -343,8 +343,11 @@
 // Apply predicate to all instructions in the machine block.
 void SSAIfConv::PredicateBlock(MachineBasicBlock *MBB, bool ReversePredicate) {
   auto Condition = Cond;
-  if (ReversePredicate)
-    TII->reverseBranchCondition(Condition);
+  if (ReversePredicate) {
+    bool CanRevCond = !TII->reverseBranchCondition(Condition);
+    assert(CanRevCond && "Reversed predicate is not supported");
+    (void)CanRevCond;
+  }
   // Terminators don't need to be predicated as they will be removed.
   for (MachineBasicBlock::iterator I = MBB->begin(),
                                    E = MBB->getFirstTerminator();