1  /* { dg-do compile } */
       2  /* { dg-options "-O2" } */
       3  
       4  typedef struct {
       5    int v;
       6  } S1;
       7  S1 clearS1 () { S1 s1 = { 0 }; return s1; }
       8   
       9  typedef struct {
      10    S1 s1[4];
      11  } S2;
      12  void clearS2 (__seg_gs S2* p, int n) {
      13    for (int i = 0; i < n; ++i)
      14      p->s1[i] = clearS1 ();
      15  }
      16   
      17  typedef struct {
      18    int pad;
      19    S2 s2;
      20  } S3;
      21   
      22  long int BASE;
      23   
      24  void fn1(int n) {
      25    clearS2 (&(((__seg_gs S3*)(BASE))->s2), n);
      26  }