Parity Flag. Error in Intel's manuals???

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zhak

Joined: 12 Apr 2005
Posts: 501
Location: Belarus

zhak 03 Aug 2008, 10:59

Intel® 64 and IA-32 Architectures Software Developer’s Manual Volume 1: Basic Architecture, APPENDIX B EFLAGS CONDITION CODES.
Table B-1. EFLAGS Condition Codes says:

Code:

Mnemonic    Condition      Status Flag Setting
P           Parity         PF = 1
PE          Parity even
--------------------
NP          No parity      PF = 0
PO          Parity odd

When tested under Bochs (DEC CX / JP label), if result is even, PF = 0 and vice versa.
It seems, that there's an error in the manual... Or it is a bug in the emulator?

03 Aug 2008, 10:59

zhak

Joined: 12 Apr 2005
Posts: 501
Location: Belarus

zhak 03 Aug 2008, 11:25

I've got it. sorry. it's my mistake. I've read the manual carefully, and it says:
Parity flag — Set if the least-significant byte of the result
contains an even number of 1 bits; cleared otherwise.

03 Aug 2008, 11:25

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