## lods - load string instructions

    mov the selected size to rax and increment/decrement rsi

There are 4 varieties of lods: lodsb, lodsw, lodsd and lodsq which load byte, word, doubleword and quadword values into al, ax, eax and rax. After each load rsi is incremented (if DF=0) or decremented (if DF=1). It is possible to use this with rep, but I can't imagine that I will ever wish to repeatedly load values into rax. Instead lods can be used within a loop to selectively load values and inspect them. In the example lodsb and stosb will be used to copy data until a 0 byte is reached and carriage-return bytes (0x0d) will not be copied.

            lea     rdi, [dest]         ; get the address of the destination array
            lea     rsi, [source]       ; get the address of the source array
            cld                         ; clear the direction flag to increment
            mov     ecx, -1             ; count is pretty big
    top:    lodsb                       ; get the next byte and increment rsi by 1
            cmp     al, 0x13
            je      top                 ; if the byte is \r skip it
            stos                        ; if it is not \r copy it
                                        ; this will increment rdi
            cmp     al, 0
            je      done                ; 0 byte means end of string
            loop    top                 ; rinse and repeat
    done:

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