From 1eea06bcc0750de02a460f3e949df2f68f800382 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcelina=20Ko=C5=9Bcielnicka?= <mwk@0x04.net>
Date: Mon, 15 Mar 2021 15:38:45 +0100
Subject: Add new helper class for merging FFs into cells, use for memory_dff.

Fixes #1854.
---
 tests/opt/bug1854.ys | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 tests/opt/bug1854.ys

(limited to 'tests/opt/bug1854.ys')

diff --git a/tests/opt/bug1854.ys b/tests/opt/bug1854.ys
new file mode 100644
index 000000000..00a36ae94
--- /dev/null
+++ b/tests/opt/bug1854.ys
@@ -0,0 +1,17 @@
+read_verilog << EOT
+module top(input clk, input [3:0] addr, output reg [0:0] dout);
+	reg [1:0] mem[0:15];
+	initial begin
+		mem[0] = 2'b00;
+		mem[1] = 2'b01;
+		mem[2] = 2'b10;
+		mem[3] = 2'b11;
+	end
+	always @(posedge clk)
+		dout <= mem[addr];
+endmodule
+EOT
+
+prep -rdff
+
+select -assert-none t:$dff
-- 
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