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From:	"Carey Evans" <carey DOT evans AT gmail DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: inline asm
Date:	3 Jul 2005 19:03:59 -0700
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GNU_man wrote:
> Has anyone successfuly using inline asm in DJGPP C programs?

I'm using the _far* functions quite a bit, and they're written as
inline assembly in include/sys/farptr.h.  I've also written my own
assembly like the examples below without any problems:

static void cpuid(
  unsigned arg, unsigned *a, unsigned *b, unsigned *c, unsigned *d)
{
  asm("cpuid"
      : "=a" (*a), "=b" (*b), "=c" (*c), "=d" (*d) : "0" (arg));
}

static int bsf(unsigned long val)
{
  int bit, tmp;
  asm("xorl %0,%0\n\t"
      "bsfl %2,%1\n\t"
      "jz 1f\n\t"
      "leal 1(%1),%0\n"
      "1:"
      : "=&q" (bit), "=q" (tmp) : "X" (val) : "cc");
  return bit;
}

-- 
Carey Evans

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