From 7afcb72c98620adaace7cc9622c4d577668f9426 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcelina=20Ko=C5=9Bcielnicka?= <mwk@0x04.net>
Date: Sun, 5 Jul 2020 00:55:38 +0200
Subject: opt_expr: Fix crash on $mul optimization with more zeros removed than
 Y has.

Fixes #2221.
---
 tests/opt/bug2221.ys | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 tests/opt/bug2221.ys

(limited to 'tests/opt')

diff --git a/tests/opt/bug2221.ys b/tests/opt/bug2221.ys
new file mode 100644
index 000000000..8ac380243
--- /dev/null
+++ b/tests/opt/bug2221.ys
@@ -0,0 +1,16 @@
+read_verilog <<EOT
+module test (
+        input [1:0] a,
+        input [1:0] b,
+        output [5:0] y
+);
+
+wire [5:0] aa = {a, 4'h0};
+wire [5:0] bb = {b, 4'h0};
+
+assign y = aa * bb;
+
+endmodule
+EOT
+
+equiv_opt -assert opt_expr
-- 
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