1  // { dg-do run }
       2  // { dg-options "-O2" }
       3  
       4  #ifndef T
       5  # if __SIZEOF_INT128__ && defined __SSE__
       6  #  define T __int128
       7  # else
       8  #  define T long
       9  # endif
      10  #endif
      11  #ifndef R
      12  # ifdef __SSE__
      13  #  define R "x"
      14  # else
      15  #  define R "r"
      16  # endif
      17  #endif
      18  
      19  
      20  typedef T A; // #define T to long or __int128
      21  struct B { char d; A c; } __attribute__((packed));
      22  struct B b[50]; // many elements to avoid loop unrolling
      23  
      24  int main () {
      25    int i;
      26    for (i = 0; i < sizeof(b) / sizeof(*b); i++) {
      27      asm ("" : "+" R (b[i].c)); // #define R to "r" on ppc or "x" on x86_64
      28    }
      29  }