yosys/tests/proc/bug_1268.v

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module gold (input clock, ctrl, din, output reg dout);
always @(posedge clock) begin
if (1'b1) begin
if (1'b0) begin end else begin
dout <= 0;
end
if (ctrl)
dout <= din;
end
end
endmodule
module gate (input clock, ctrl, din, output reg dout);
always @(posedge clock) begin
if (1'b1) begin
if (1'b0) begin end else begin
dout <= 0;
end
end
if (ctrl)
dout <= din;
end
endmodule