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Title: .if eax < 0 / zeroflag , noob question
Post by: kermit on November 28, 2006, 07:18:33 PM

hello,

i recently made a mistake in my code trying to use

.if eax<0
   ...

which wasn't working as expected, because eax was always treated as positive number, even though i explicitly moved -1 to eax :P
is there a different way than coding:

Code Select

.if eax<=-1
   ...

?
And i wondered if there is a way to check the flags with the .if/.elseif constructs, somehow like this:

Code Select


.if zeroflag
...

?

oliver

Title: Re: .if eax < 0 / zeroflag , noob question
Post by: hutch-- on November 28, 2006, 07:26:45 PM

Hi Oliver,

Welcome on board. Try something like this.

Code Select


.if SDWORD PTR eax < 0

Title: Re: .if eax < 0 / zeroflag , noob question
Post by: P1 on November 28, 2006, 09:33:12 PM

Oliver,

Welcome :U

I nice learning tool is to use Svin tttn for op code jump decisions.

Regards, P1 :8)

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Title: Re: .if eax < 0 / zeroflag , noob question
Post by: Ehtyar on November 28, 2006, 09:44:36 PM

I think you're looking for ".IF (ZERO?)"?

Title: Re: .if eax < 0 / zeroflag , noob question
Post by: kermit on November 28, 2006, 09:51:48 PM

thanx for the welcome and the suggestions,
i'll give them a try

@ehtyar yes, that was what i was looking for, i guess there is an ".if (SIGN?) " also

thx,

oliver

Title: Re: .if eax < 0 / zeroflag , noob question
Post by: Ehtyar on November 28, 2006, 10:08:23 PM

You will find all of these operators in the masm32.hlp file that comes with masm32. The available flags are:
CARRY?
OVERFLOW?
PARITY?
SIGN?
ZERO?

Hope this helps, Ehtyar.

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General Forums => The Campus => Topic started by: kermit on November 28, 2006, 07:18:33 PM