2 In Label I_A Bits 32 In Label I_B Bits 32 Out Label O Bits 32 Multiplexer Selector Bits 4 Bits 32 Sub Bits 32 32_bit_adder.dig In Label I_SEL Bits 4 Or Bits 32 And Bits 32 Const Value 0 Bits 32 Ground rotation Ground rotation Ground rotation