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-rw-r--r--tests/opt/opt_expr_plus_assignment.ys15
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diff --git a/tests/opt/opt_expr_plus_assignment.ys b/tests/opt/opt_expr_plus_assignment.ys
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+++ b/tests/opt/opt_expr_plus_assignment.ys
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+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;
+initial begin
+ a += i;
+ a += j;
+end
+ assign o = a;
+endmodule
+EOT
+proc
+equiv_opt -assert opt_expr -fine
+design -load postopt
+
+select -assert-count 1 t:$add r:A_WIDTH=9 r:B_WIDTH=8 r:Y_WIDTH=9 %i %i %i