1 files changed, 18 insertions, 0 deletions
diff --git a/tests/opt/opt_share_extend.v b/tests/opt/opt_share_extend.v
new file mode 100644
index 000000000..d39f19069
--- /dev/null
+++ b/tests/opt/opt_share_extend.v
@@ -0,0 +1,18 @@
+module opt_share_test(
+  input signed [7:0]       a,
+  input signed [10:0]      b,
+  input signed [15:0]      c,
+  input [1:0]              sel,
+  output reg signed [15:0] res
+  );
+
+  always @* begin
+    case(sel)
+      0: res = a + b;
+      1: res = a - b;
+      2: res = a + c;
+      default: res = 16'bx;
+    endcase
+  end
+
+endmodule