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/* { dg-do run { target i?86-*-* x86_64-*-* } } */

/* { dg-options "-O2" } */

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);

}