1  /* { dg-do compile } */
       2  /* { dg-options "-O -fdump-tree-optimized" } */
       3  
       4  void sink (void*);
       5  
       6  void f (const char *s)
       7  {
       8    char a[256];
       9  
      10    __builtin_memset (a, 0, sizeof a);   // redundant memset
      11    __builtin_strncpy (a, s, sizeof a);
      12  
      13    sink (a);
      14  }
      15  
      16  /* { dg-final { scan-tree-dump-not "memset" "optimized" } } */