void *x (void *pdst, const void *psrc, unsigned int pn)
{
register void *return_dst = pdst;
register unsigned char *dst = pdst;
register unsigned const char *src = psrc;
register int n __asm__ ("ebx") = pn;
if (src < dst && dst < src + n)
{
src += n;
dst += n;
while (n--)
*--dst = *--src;
return return_dst;
}
while (n >= 16) n--;
return return_dst;
}
extern void abort ();
extern void exit (int);
char xx[30] = "abc";
int main (void)
{
char yy[30] = "aab";
if (x (xx + 1, xx, 2) != xx + 1 || memcmp (xx, yy, sizeof (yy)) != 0)
abort ();
exit (0);
}