From 4e9b1d36fa896a8280e9c4295cf9a4e2a084f927 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Fri, 19 Jul 2019 12:50:11 -0700
Subject: [PATCH] Add tests for sub too

---
 tests/various/wreduce.ys | 49 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)

diff --git a/tests/various/wreduce.ys b/tests/various/wreduce.ys
index 0b5403fa1..ee03e008d 100644
--- a/tests/various/wreduce.ys
+++ b/tests/various/wreduce.ys
@@ -5,7 +5,7 @@ module wreduce_add_test(input [3:0] i, input [7:0] j, output [7:0] o);
 endmodule
 EOT
 
-hierarchy -top wreduce_add_test
+hierarchy -auto-top
 proc
 design -save gold
 
@@ -20,3 +20,50 @@ design -import gate -as gate
 
 miter -equiv -flatten -make_assert -make_outputs gold gate miter
 sat -verify -prove-asserts -show-ports miter
+
+
+### X - 0
+read_verilog <<EOT
+module wreduce_sub_test1(input [3:0] i, input [7:0] j, output [7:0] o);
+    assign o = j - (i << 4);
+endmodule
+EOT
+
+hierarchy -auto-top
+proc
+design -save gold
+
+prep
+
+select -assert-count 1 t:$sub r:A_WIDTH=4 r:B_WIDTH=4 %i %i
+
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -verify -prove-asserts -show-ports miter
+
+### 0 - X
+read_verilog <<EOT
+module wreduce_sub_test1(input [3:0] i, input [7:0] j, output [7:0] o);
+    assign o = (i << 4) - j;
+endmodule
+EOT
+
+hierarchy -auto-top
+proc
+design -save gold
+
+prep
+
+select -assert-count 1 t:$sub r:A_WIDTH=8 r:B_WIDTH=8 %i %i
+
+design -stash gate
+
+design -import gold -as gold
+design -import gate -as gate
+
+miter -equiv -flatten -make_assert -make_outputs gold gate miter
+sat -verify -prove-asserts -show-ports miter
-- 
2.30.2