Index: utils/TableGen/RegisterBankEmitter.cpp
===================================================================
--- utils/TableGen/RegisterBankEmitter.cpp
+++ utils/TableGen/RegisterBankEmitter.cpp
@@ -269,7 +269,7 @@
      << "#ifndef NDEBUG\n"
      << "  unsigned Index = 0;\n"
      << "  for (const auto &RB : RegBanks)\n"
-     << "    assert(Index++ == RB->getID() && \"Index != ID\");\n"
+     << "    assert(Index + 1 == RB->getID() && \"Index != ID\");\n"
      << "#endif // NDEBUG\n"
      << "}\n"
      << "} // end namespace llvm\n";