From 856d45506573788c4ccd4982ea50b388a8313214 Mon Sep 17 00:00:00 2001
From: "Emil J. Tywoniak" <emil@tywoniak.eu>
Date: Fri, 19 Dec 2025 18:32:06 +0100
Subject: [PATCH] opt_expr: avoid multiple drivers issue #4792 in combined
 assign tests

---
 tests/opt/opt_expr_combined_assign.ys | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/tests/opt/opt_expr_combined_assign.ys b/tests/opt/opt_expr_combined_assign.ys
index f84978a0a..823ca959a 100644
--- a/tests/opt/opt_expr_combined_assign.ys
+++ b/tests/opt/opt_expr_combined_assign.ys
@@ -1,7 +1,8 @@
 read_verilog -sv <<EOT
 module opt_expr_or_test(input [3:0] i, input [7:0] j, output [8:0] o);
-wire[8:0] a = 8'b0;
+wire[8:0] a;
 initial begin
+    a = 8'b0;
 	a |= i;
 	a |= j;
 end
@@ -17,8 +18,9 @@ select -assert-count 1 t:$or r:A_WIDTH=4 r:B_WIDTH=4 r:Y_WIDTH=4 %i %i %i
 design -reset
 read_verilog -sv <<EOT
 module opt_expr_add_test(input [3:0] i, input [7:0] j, output [8:0] o);
-wire[8:0] a = 8'b0;
+wire[8:0] a;
 initial begin
+    a = 8'b0;
 	a += i;
 	a += j;
 end
@@ -34,8 +36,9 @@ select -assert-count 1 t:$add r:A_WIDTH=9 r:B_WIDTH=8 r:Y_WIDTH=9 %i %i %i
 design -reset
 read_verilog -sv <<EOT
 module opt_expr_xor_test(input [3:0] i, input [7:0] j, output [8:0] o);
-wire[8:0] a = 8'b0;
+wire[8:0] a;
 initial begin
+    a = 8'b0;
 	a ^= i;
 	a ^= j;
 end
@@ -51,8 +54,9 @@ select -assert-count 1 t:$xor r:A_WIDTH=4 r:B_WIDTH=4 r:Y_WIDTH=4 %i %i %i
 design -reset
 read_verilog -sv <<EOT
 module opt_expr_sub_test(input [3:0] i, input [7:0] j, output [8:0] o);
-wire[8:0] a = 8'b0;
+wire[8:0] a;
 initial begin
+    a = 8'b0;
 	a -= i;
 	a -= j;
 end
@@ -68,8 +72,9 @@ select -assert-count 1 t:$sub r:A_WIDTH=9 r:B_WIDTH=8 r:Y_WIDTH=9 %i %i %i
 design -reset
 read_verilog -sv <<EOT
 module opt_expr_and_test(input [3:0] i, input [7:0] j, output [8:0] o);
-wire[8:0] a = 8'b11111111;
+wire[8:0] a;
 initial begin
+    a = 8'b11111111;
 	a &= i;
 	a &= j;
 end