8B 00 7C 19 45 ............


assembly (x86, nasm)

    mov eax, ebx
    mov eax, 1597
    nem megy: mov 197, ecx

32 bites regiszter
    eax -------- -------- ----0--- --------
     ax                   ----0--- --------
     al                            --------
     ah                   ----0---
    ebx
    ecx
    edx
    esi
    edi



    add eax, ebx    ; eax := eax + ebx
    add esi, 17     ; esi := esi + 17
    add eax, 1
    inc eax
    
    sub edx, edi
    sub edx, 7
    dec ebx

    mul ebx
        ; edx:eax := eax * ebx
        ; ha kicsik: eax := eax * ebx, edx := 0

    ; nincsen: mul esi, edi

    div esi
        ; eax := edx:eax / esi
        ; edx := edx:eax % esi


; eax := eax ^ 13 = eax ^ 8 * eax ^ 4 * eax ^ 1 = eax ^ (8+4+1)=
       = eax ^ (1101b)

    mov ebx, eax    ; ebx := a
    mul eax         ; eax := a^2, edx := 0
    mul eax         ; eax := a^4, edx := 0
    mov ecx, eax    ; ecx := a^4
    mul eax         ; eax := a^8, edx := 0
    mul ecx         ; eax := a^12, edx := 0
    mul ebx         ; eax := a^13, edx := 0

    mul eax
    mul eax
    mul eax
    mul eax
    mul eax
    mul eax
    mul eax
    mul eax


; futasi ideju verem
    push edx        ; verem := [edx regi erteke]
    pop esi         ; esi := edx regi erteke, verem := []


; eax := a * b * (c - s) + d * s * (d2-a)
;        --1--   --2---    --3---   --4---
;          -----5-----       -----6-----
;               ----------7--------

    push eax        ; verem [a]
    push edx        ; verem [d,a]
    mul ebx         ; eax := a * b, edx := 0    (1)
    sub ecx, esi    ; ecx := c - s              (2)
    mul ecx         ; eax := a * b * (c - s)    (5)
    mov ecx, eax    ; ecx := a * b * (c - s)
    pop eax         ; eax := d, verem [a]
    mul esi         ; eax := d * s, edx := 0    (3)
    pop ebx         ; ebx := a, verem []
    sub edi, ebx    ; edi := d2-a               (4)
    mul edi         ; eax := d * s * (d2-a)     (6)
    add eax, ecx    ; eax kesz                  (7)



    section .data       ; adatszegmens

abc     dd      21, 63124, 643
xyz     db      17, 53
text    db      97, 98, 99, 0
text2   db      "abc", 0
    ; db : define byte
    ; dd : define doubleword (32 bit)

    section .text

    mov eax, [abc]      ; eax := 21
    mov ebx, abc        ; eax := 125912467126
    mov eax, [ebx]      ; eax := 21

int *ip;
int i = *ip;




    section .data

a   dd   1
b   dd   1
c   dd   1
d   dd   1
s   dd   1
d2  dd   1

;   -------------------8-------------------
;               ----------7--------
;          -----5-----       -----6-----
;        --1--   --2---    --3---   --4---
;   a := a * b * (c - s) + d * s * (d2-a)

    ; 1
    mov eax, [a]    ; eax := a
    mov edx, [b]    ; edx := b
    mul edx         ; eax := a*b, edx := 0
    push eax        ; [a*b]
    ; 2
    mov eax, [c]    ; eax := c
    sub eax, [s]    ; eax := c - s
    push eax        ; [c-s,a*b]
    ; 5
    pop eax         ; eax := c-s, [a*b]
    pop edx         ; edx := a*b, []
    mul edx         ; eax := a*b*(c-s), edx := 0
    push eax        ; [a*b*(c-s)]
    ; 3
    mov eax, [d]
    mov edx, [s]
    mul edx         ; eax := d*s, edx := 0
    push eax        ; [d*s,a*b*(c-s)]
    ; 4
    mov eax, [d2]
    sub eax, [a]
    push eax        ; [d2-a,d*s,a*b*(c-s)]
    ; 6
    pop eax
    pop edx
    mul edx         ; [a*b*(c-s)], eax := (d2-a)*d*s, edx := 0
    push eax        ; [(d2-a)*d*s, a*b*(c-s)]
    ; 7
    pop eax
    pop edx
    add eax, edx    ; [], eax kesz
    push eax        ; [a vegeredmeny]
    ; 8
    pop eax         ; eax a vegeredmeny
    mov [a], eax    ; a := a vegeredmeny




    jmp hova

hova:



    cmp eax, [a]
    j??? hova

a bove          > elojel nelkul
b elow          < elojel nelkul
g reater        > elojelesen
l ess           < elojelesen
e qual          =
(n ot)

    ja, jb, jg, jl
    jae, jbe, jge, jle
    je
    jna, jnb, jng, jnl
    jnae, jnbe, jnge, jnle
    jne

    nincsen: jn