1 files changed, 21 insertions, 0 deletions
diff --git a/test/CodeGen/MIR/X86/unknown-instruction.mir b/test/CodeGen/MIR/X86/unknown-instruction.mir
new file mode 100644
index 000000000000..4e58ca6bad40
--- /dev/null
+++ b/test/CodeGen/MIR/X86/unknown-instruction.mir
@@ -0,0 +1,21 @@
+# RUN: not llc -march=x86-64 -start-after branch-folder -stop-after branch-folder -o /dev/null %s 2>&1 | FileCheck %s
+# This test ensures that an error is reported when an unknown instruction is
+# encountered.
+
+--- |
+
+  define i32 @foo() {
+  entry:
+    ret i32 0
+  }
+
+...
+---
+name:            foo
+body:
+ - id:           0
+   name:         entry
+   instructions:
+     # CHECK: [[@LINE+1]]:8: unknown machine instruction name 'retJust0'
+     - retJust0
+...