1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/utils/TableGen/X86DisassemblerTables.cpp b/llvm/utils/TableGen/X86DisassemblerTables.cpp
index f3bd373708f..8526621599a 100644
--- a/llvm/utils/TableGen/X86DisassemblerTables.cpp
+++ b/llvm/utils/TableGen/X86DisassemblerTables.cpp
@@ -366,6 +366,10 @@ void DisassemblerTables::emitModRMDecision(raw_ostream &o1, raw_ostream &o2,
       break;
   }
 
+  // We assume that the index can fit into uint16_t.
+  assert(sEntryNumber < 65536U &&
+         "Index into ModRMDecision is too large for uint16_t!");
+
   ++sTableNumber;
 }