assembly - I am trying to copy the data of one array to another array -


the codes below attempt copy contents 1 array another. reason not working. can me this?

;copy frequency array calculation array lea dx,frequency lea ax,array mov cx,512   address: mov bx, dx mov ax, bx inc dx inc ax loop address

this code fixed, explanation comes after :

;copy frequency array calculation array   lea  si, frequency      ;si = pointer frequency.   lea  di, array          ;di = pointer array.   mov  cx, 512            ;counter. address:   mov  ax, [ si ]         ;get 2 bytes frequency.   mov  [ di ], ax         ;put 2 bytes array.   add  si, 2              ;next 2 bytes in frequency.   add  di, 2              ;next 2 bytes in array.   sub  cx, 2              ;counter-2.   jnz  address            ;if ( counter != 0 ) repeat.

dx changed si , ax di because dx , ax cannot used pointers, not allowed [ ax ] or [ dx ]. si , di pointers nature, names mean "source index" , "destination index", can used [ si ] , [ di ]. it's extremely important learn difference between si , [si] : first 1 address, second content of address.

si, di , cx incremented/decremented 2 because not moving bytes words (two bytes). it's faster way.

finally, it's better avoid using words "address" because might reserved words.


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