## pop

    dest = *rsp
    rsp = rsp + 8       ; normal case

The pop instruction decrements the stack pointer (rsp) and then places the operand at the memory address contained in rsp. The destination can be a 64, 32, or 16 bit register or memory location. While it is possible to pop quantities less than 64 bits, I suggest exercising care when popping smaller quantities. In general it is important to maintain the stack on 16 byte boundaries, so if you wish to pop something and then call a function which you did not write (like printf), then pop an even number of quadwords. It is possible to write efficient code without pop.

            pop    rbp              ; pop register rbp onto the stack
            pop    qword [x]        ; pop 64 bit variable x
            pop    eax              ; pop 32 bit register

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