Mail Archives: djgpp/1998/02/18/15:01:58
From: | chris doty <orz AT wpi DOT edu>
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Newsgroups: | comp.os.msdos.djgpp
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Subject: | Re: !!NEGATIVE NUMBERS IN ASM!! Pleez answer.
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Date: | Wed, 18 Feb 1998 14:39:44 -0800
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Organization: | Worcester Polytechnic Institute
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Lines: | 8
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Message-ID: | <34EB6330.2388@wpi.edu>
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References: | <34EB3694 DOT 714183B6 AT mail DOT htk DOT fi>
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NNTP-Posting-Host: | orz.res.wpi.net
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Mime-Version: | 1.0
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To: | djgpp AT delorie DOT com
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DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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> I just want to know, how I can change a number, which is negative, to
> positive,
> and in asm. I bet it can be done, but how?
> I've got an almost ready cool demo-effect, but when I add two numbers
> together,
> the other one is negative, and I can't do anything about it.
x86s have hardware support for flipping the sign. I believe mnemonic is
NEG. This is equivelent to a NOT followed by an INC.
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