## mov - move

    dest = source

The mov instruction moves the source value (second operand) to the destination (either a register or a memory location). The destination can be a 64, 32, 16 or 8 bit register or memory location. The source can be either a register, memory location or an immediate value. You can not use 2 memory addresses. You also can't move an immediate value into a memory address.

Moving a 32 bit quantity into a register will clear out the upper half of the destination register. Moving a 16 or 8 quantity into a register will leave the rest of the register alone.

            mov     rax, 0xfedcba9876543210     ; move a 64 bit number into rax
            mov     eax, 12                     ; moves 12 into rax
                                                ; places 0 into upper half of rax
            mov     dx, ax                      ; moves ax into dx
                                                ; leaves upper 3/4 of rdx alone
            mov     rax, [y]                    ; moves 64 bit variable y into rax
            mov     [x], eax                    ; move eax into 32 bit variable x

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