From: clc5q AT cobra DOT cs DOT Virginia DOT EDU (Clark L. Coleman)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Some assembly questions
Date: 18 Mar 1999 16:40:10 GMT
Organization: University of Virginia
Lines: 22
Message-ID: <7cra9a$ui$1@murdoch.acc.Virginia.EDU>
References: <199903170746 DOT IAA06061 AT login-2 DOT eunet DOT no> <7cq156$q5$2 AT news DOT luth DOT se>
NNTP-Posting-Host: cobra.cs.virginia.edu
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

In article <7cq156$q5$2 AT news DOT luth DOT se>,
Martin Str|mberg <ams AT ludd DOT luth DOT se> wrote:
>Gisle Vanem (gvanem AT eunet DOT no) wrote:
>: ams AT ludd DOT luth DOT se (Martin Str|mberg) said:
>: 
>: > How do I set or clear the carry flag? I _think_ "andl %%eax, %%eax"
>: > clears it (and "orl %%eax, %%eax" too).
>: 
>: How about "setc" and "clc" ?
>
>Hmm. I get "operands given don't match any known 386 instruction".
>
>What is setc called in gas assembly?
>
>And yes, I _am_ an assembly neophyte.

Your were given a bad mnemonic: "setc" is actually "stc".

asm volatile("clc");  /* clears (sets to 0) the carry flag */
asm volatile("cmc");  /* complements (inverts) the carry flag */
asm volatile("stc");  /* sets (to 1) the carry flag */