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yosys/tests/sat/initval.ys

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read_verilog -sv initval.v
proc;;
sat -seq 10 -prove-asserts
design -reset
read_verilog -icells <<EOT
module top(input clk, i, output o, p);
(* init = 1'bx *)
wire p = o;
$_DFF_P_ dff (.C(clk), .D(i), .Q(o));
endmodule
EOT
sat -seq 1