From cba859cacf8c6631146dbdaa0f297c060b5a68cd Mon Sep 17 00:00:00 2001
From: Tristan Gingold <tgingold@free.fr>
Date: Mon, 25 Jan 2021 18:32:14 +0100
Subject: testsuite: add testcase for ghdl/ghdl#1610

---
 testsuite/ghdl-issues/issue1610/exp.vhdl     | 32 ++++++++++++++++++++++++++++
 testsuite/ghdl-issues/issue1610/testsuite.sh | 10 +++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 testsuite/ghdl-issues/issue1610/exp.vhdl
 create mode 100755 testsuite/ghdl-issues/issue1610/testsuite.sh

diff --git a/testsuite/ghdl-issues/issue1610/exp.vhdl b/testsuite/ghdl-issues/issue1610/exp.vhdl
new file mode 100644
index 0000000..3d3ac38
--- /dev/null
+++ b/testsuite/ghdl-issues/issue1610/exp.vhdl
@@ -0,0 +1,32 @@
+library IEEE;
+use IEEE.std_logic_1164.ALL;
+use IEEE.numeric_std.ALL;
+
+entity exp is
+  port (
+    clk : in    std_logic
+  );
+end entity exp;
+
+architecture behav of exp is
+
+  signal ver_clk : std_logic;
+  signal count : integer := 0;
+
+  attribute gclk : boolean;
+  attribute gclk of ver_clk : signal is true;
+
+begin
+
+  default Clock is rising_edge(clk);
+
+  process (ver_clk)
+  begin
+    if rising_edge(ver_clk) then
+      count <= count + 1;
+    end if;
+  end process;
+
+  assert always next count = prev(count) + 1;
+
+end architecture behav;
diff --git a/testsuite/ghdl-issues/issue1610/testsuite.sh b/testsuite/ghdl-issues/issue1610/testsuite.sh
new file mode 100755
index 0000000..9fef001
--- /dev/null
+++ b/testsuite/ghdl-issues/issue1610/testsuite.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+topdir=../..
+. $topdir/testenv.sh
+
+run_yosys -q -p "ghdl --std=08 exp.vhdl -e; write_rtlil exp.il"
+fgrep 'cell $ff' exp.il
+
+clean
+echo OK
-- 
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