The registers are made of small repeated blocks, one per bit, so they form a grid. The adder (and ALU) is also repeated for each bit, but each unit is much larg

The registers are made of small repeated blocks, one per bit, so they form a grid. The adder (and ALU) is also repeated for each bit, but each unit is much larger and more complex. It also helps that the block diagrams and patent diagrams roughly match the die layout.