diff --git a/test/CodeGen/X86/subclass-coalesce.ll b/test/CodeGen/X86/subclass-coalesce.ll
new file mode 100644
index 00000000000..26e6256ea0f
--- /dev/null
+++ b/test/CodeGen/X86/subclass-coalesce.ll
@@ -0,0 +1,17 @@
+; RUN: llvm-as < %s | llc -march=x86 -join-subclass-copies -stats |& grep {Number of subclass joins performed}
+
+@mem.6 = external global i64		; <i64*> [#uses=1]
+
+define i64 @attachFunc() nounwind  {
+entry:
+	%tmp64.i = add i64 0, 72		; <i64> [#uses=1]
+	%tmp68.i = load i64* @mem.6, align 8		; <i64> [#uses=1]
+	%tmp70.i = icmp sgt i64 %tmp64.i, %tmp68.i		; <i1> [#uses=1]
+	br i1 %tmp70.i, label %bb73.i, label %bb116
+
+bb73.i:		; preds = %entry
+	br label %bb116
+
+bb116:		; preds = %bb73.i, %entry
+	ret i64 %tmp68.i
+}