z/Architecture® provides many new instructions that use two 64-bit binary integers to produce a 64-bit binary integer. These instructions include a "G" in the instruction mnemonic (AG and LG). Some of these instructions are similar to S/390® instructions. Consider the example of an Add G instruction: AG R3,NUM64. This instruction takes the value of a doubleword binary integer at location NUM64 and adds it to the contents of GPR3, placing the sum in GPR3:

The second example, LG R3,TWOWORDS, takes a doubleword at location TWOWORDS and puts it into GPR3.

Because 32-bit binary integers are prevalent in S/390, z/Architecture also provides instructions that use a 64-bit binary integer and a 32-bit binary integer. These instructions include a "GF" in the instruction mnemonic (AGF and LGF). Consider AGF. In AGF R3,MYDATA, assume that MYDATA holds a 32-bit positive binary integer, and GPR3 holds a 64-bit positive binary integer. (The numbers could have been negative.) The AGF instruction adds the contents of MYDATA to the contents of GPR3 and places the resulting signed binary integer in GPR3; the sign extension, in this case, is zeros.