1  /* { dg-do compile { target lp64 } } */
       2  /* { dg-options "-O -foptimize-strlen" } */
       3  
       4  #define ELEMS 0x40000000
       5  
       6  int a[ELEMS];
       7  int b[ELEMS];
       8  
       9  int main()
      10  {
      11    __builtin_memcpy(a, b, ELEMS*sizeof(int));
      12  }