1 files changed, 28 insertions, 0 deletions
diff --git a/llvm/test/TableGen/FixedLenDecoderEmitter/sub-arg-dag-error-1.td b/llvm/test/TableGen/FixedLenDecoderEmitter/sub-arg-dag-error-1.td
new file mode 100644
index 000000000000..7090eaf20a9a
--- /dev/null
+++ b/llvm/test/TableGen/FixedLenDecoderEmitter/sub-arg-dag-error-1.td
@@ -0,0 +1,28 @@
+// RUN: not llvm-tblgen -gen-disassembler -I %p/../../../include %s 2>&1 \
+// RUN:   | FileCheck %s --implicit-check-not=error:
+
+include "llvm/Target/Target.td"
+
+def R0 : Register<"r0">;
+def RC : RegisterClass<"MyTarget", [i32], 32, (add R0)>;
+
+// Used to crash.
+// CHECK: error: In instruction 'I', operand #0 has 1 sub-arg names, but no sub-operands
+
+def I : Instruction {
+  let Size = 1;
+  bits<8> Inst;
+  bits<1> r;
+
+  let Inst{0} = 0;
+  let Inst{1} = r;
+
+  let OutOperandList = (outs);
+  let InOperandList = (ins (RC $r):$op);
+}
+
+def II : InstrInfo;
+
+def MyTarget : Target {
+  let InstructionSet = II;
+}