Message-ID:	<3E2D132C.CEF919C4@yahoo.com>
From:	CBFalconer <cbfalconer AT yahoo DOT com>
Organization:	Ched Research
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Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: C/C++ versions of asm opcodes.
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Date:	Tue, 21 Jan 2003 09:55:00 GMT
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To:	djgpp AT delorie DOT com
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Joel_S wrote:
> 
> Ok, there are some C/C++ functions for asm opcodes, like << and
> >> for shl and shr (using Intel assembly syntax instead of AT&T).
> And I know how to translate some opcodes that don't have a C/C++
> equivalent.  But there are some things in asm that I'm wondering
> if I could do in C or C++, like
> ror
> rol
> adc
> sbb
> if anybody knows how to do these in C, I'd like to know.  Thanks.

/* untested example */
unsigned int ror(unsigned int n)
{
   unsigned int signbit, sign;

   signbit = UINT_MAX - INT_MAX;  /* shaky here */
   sign = (n & 1) * signbit;
   n = (n >> 1) | sign;
   return n;
}

-- 
Chuck F (cbfalconer AT yahoo DOT com) (cbfalconer AT worldnet DOT att DOT net)
   Available for consulting/temporary embedded and systems.
   <http://cbfalconer.home.att.net>  USE worldnet address!

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