From 6258e6a7e28ade2bdc7b6809675461326c873a45 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Fri, 20 Sep 2019 17:49:26 -0700
Subject: Add testcase

---
 tests/techmap/autopurge.ys | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 tests/techmap/autopurge.ys

diff --git a/tests/techmap/autopurge.ys b/tests/techmap/autopurge.ys
new file mode 100644
index 000000000..4773d5ce3
--- /dev/null
+++ b/tests/techmap/autopurge.ys
@@ -0,0 +1,43 @@
+# https://github.com/YosysHQ/yosys/issues/1391
+read_verilog <<EOT
+module sub(input i, output o, (* techmap_autopurge *) input [1:0] j);
+foobar f(i, o, j);
+endmodule
+EOT
+design -stash techmap
+
+read_verilog <<EOT
+(* blackbox *)
+module sub(input i, output o, input j);
+endmodule
+
+(* blackbox *)
+module foobar(input i, output o, input j);
+endmodule
+
+module top(input i, output o);
+sub s0(i, o);
+endmodule
+EOT
+
+techmap -map %techmap
+hierarchy
+check -assert
+
+read_verilog -overwrite <<EOT
+(* blackbox *)
+module sub(input i, output o, input j);
+endmodule
+
+(* blackbox *)
+module foobar(input i, output o, input j);
+endmodule
+
+module top(input i, output o);
+wire j;
+sub s0(i, o, j);
+endmodule
+EOT
+
+techmap -map %techmap
+hierarchy
-- 
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