From ac6c4cc0942924c01de7563b0c99af01b99780f9 Mon Sep 17 00:00:00 2001
From: Riley King-Saunders <riley.kingsaunders@gmail.com>
Date: Tue, 13 Oct 2026 22:24:43 +1100
Subject: [PATCH] Added module for sign extension. Needs test cases

---
 modules/sign_extender.sv | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 modules/sign_extender.sv

diff --git a/modules/sign_extender.sv b/modules/sign_extender.sv
new file mode 100644
index 0000000..114e13d
--- /dev/null
+++ b/modules/sign_extender.sv
@@ -0,0 +1,13 @@
+`ifndef SIGN_EXTENDER_H
+`define SIGN_EXTENDER_H
+
+module sign_extender #(in_width=4, out_width=5)(
+    input logic [0:0] op,
+    input logic [2**in_width-1:0] val,
+    output logic [2**out_width-1:0] ext_val
+);
+    always_comb begin
+        assign ext_val = (op) ? {{(2**(out_width-in_width)){val[2**in_width-1]}}, val} : ({{(2**(out_width-in_width)){1'b0}}, val});
+    end
+endmodule
+`endif