meh.v

always @(posedge clk) begin
   if (rden) begin
      bypass_flag <= wren && (rdaddr == wraddr);
      bypass_data <= wrdata;
      old_data <= mem[rdaddr];
   end
   if (wren)
      mem[wraddr] <= wrdata;
end

assign rddata = bypass_flag ? bypass_data : old_data;