Why is this input signal used only after 3 clock cycles and not immediately?

• ibex-demo-system

  5 40 8.2 C

  A demo system for Ibex including debug support and some peripherals

  

I was trying to understand this implementation of a gpio module (https://github.com/lowRISC/ibex-demo-system/blob/main/rtl/system/gpio.sv). It seems that every clock cycle the input signal gp_i is stacked into gp_i_q and the current value of gp_i is only used after 3 clock cycles. Why is that?

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