1 files changed, 15 insertions, 0 deletions
diff --git a/tests/opt/opt_share_cat.v b/tests/opt/opt_share_cat.v
new file mode 100644
index 000000000..7fb97fef5
--- /dev/null
+++ b/tests/opt/opt_share_cat.v
@@ -0,0 +1,15 @@
+module opt_share_test(
+  input [15:0]  a,
+  input [15:0]  b,
+  input [15:0]  c,
+  input [15:0]  d,
+  input         sel,
+  output [63:0] res,
+  );
+
+  reg [31: 0]   cat1 = {a+b, c+d};
+  reg [31: 0]   cat2 = {a-b, c-d};
+
+  assign res = {b, sel ? cat1 : cat2, a};
+
+endmodule