parity bit

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marcinzabrze12

Joined: 07 Aug 2011
Posts: 61

marcinzabrze12 31 Mar 2013, 18:21

Helo everyone. Parity Flag should give to me result of last operation i'm right or no ?

Code:

start:
        mov             eax, 3
        jp              @F
        invoke  MessageBox, HWND_DESKTOP, 'IS NOT PARITY VALUE', 'RESULT:', MB_OK
        invoke  ExitProcess, 0
        @@:
        invoke  MessageBox, HWND_DESKTOP, 'IS PARITY VALUE', 'RESULT:', MB_OK
        invoke  ExitProcess, 0

this code tell me that in eax i have parity value Shocked

31 Mar 2013, 18:21

HaHaAnonymous

Joined: 02 Dec 2012
Posts: 1178
Location: Unknown

HaHaAnonymous 31 Mar 2013, 18:24

[ Post removed by author. ]

Last edited by HaHaAnonymous on 28 Feb 2015, 21:08; edited 1 time in total

31 Mar 2013, 18:24

marcinzabrze12

Joined: 07 Aug 2011
Posts: 61

marcinzabrze12 31 Mar 2013, 18:59

Code:

mov             eax, 00000000000000000000000000000010b
        test            eax, eax
        jp              @F
        ...

something strange because code like above tell me that in eax is not parity ... I know that i can use simple

Code:

         bt     eax, 0
         jc      .not_parity

... but i want to know what is wrong in this code.

31 Mar 2013, 18:59

HaHaAnonymous

Joined: 02 Dec 2012
Posts: 1178
Location: Unknown

HaHaAnonymous 31 Mar 2013, 19:05

[ Post removed by author. ]

Last edited by HaHaAnonymous on 28 Feb 2015, 21:08; edited 1 time in total

31 Mar 2013, 19:05

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 31 Mar 2013, 19:11

marcinzabrze12,

HaHaAnonymous is right. Another important thing to consider is that only least significant byte of the result matters.

31 Mar 2013, 19:11

marcinzabrze12

Joined: 07 Aug 2011
Posts: 61

marcinzabrze12 31 Mar 2013, 20:02

omg. thak you people. now everything is clear. i was think that is like decimal system where 2 is parity .... ok. thanks.

31 Mar 2013, 20:02

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