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FLAGS!

 
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Dr.Disrespect
Grandmaster Cheater
Reputation: 3

Joined: 17 Feb 2016
Posts: 526
PostPosted: Sat Apr 02, 2016 7:22 pm    Post subject: FLAGS! Reply with quote
Sorry for the capitalized title, but I wanna rage. Very Happy

The instructions that changes the flags are making me crazy.
Suppose:
EAX == 0000021F

after the following code:
Code:

cmp eax,00000513


CF, PF and SF are all set to 1.

According to a tutorial, "PF : Parity Flag. Set if the number of set bits in the least significant byte is a multiple of 2." But I don't see any multiple of 2 in the numbers above....

Can anyone explain about how the flags and comparison work? Sad
Thanks.
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Zanzer
I post too much
Reputation: 126

Joined: 09 Jun 2013
Posts: 3278
PostPosted: Sat Apr 02, 2016 9:45 pm    Post subject: Reply with quote
I don't use these flags much, so someone can correct me when I'm wrong. Smile

CMP is equivalent to a SUB.
0513 - 021F = FD0C == ‭1111 1101 0000 1100‬
PF only reflects the least significant (last) byte.
0000 1100 contains 2 ones. 2 is an even number.

Flag set.
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Dr.Disrespect
Grandmaster Cheater
Reputation: 3

Joined: 17 Feb 2016
Posts: 526
PostPosted: Sat Apr 02, 2016 11:04 pm    Post subject: Reply with quote
Zanzer wrote:
I don't use these flags much, so someone can correct me when I'm wrong. Smile

CMP is equivalent to a SUB.
0513 - 021F = FD0C == ‭1111 1101 0000 1100‬
PF only reflects the least significant (last) byte.
0000 1100 contains 2 ones. 2 is an even number.

Flag set.

Sorry for the late reply.
Oh, its the last "byte", i thought it was "bit"... Got it, thanks.
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