gcc/testsuite/gcc.dg/tree-ssa/20070815.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -w" } */
   3
   4 /* This code snippet from glibc 2.3.5 was causing an ICE during
   5    optimization because we were failing to update the SSA form for
   6    stale name tags.  These are tags that are associated with SSA pointers
   7    that have been removed from the IL.  This was causing the SSA
   8    verifier to fail before we had a chance to run the cleanup pass that
   9    finally removes all the remaining PHI nodes for the stale name tag.  */
  10 struct _IO_wide_data
  11 {
  12 };
  13 struct _IO_FILE {
  14 };
  15 typedef struct _IO_FILE _IO_FILE;
  16 struct _IO_jump_t
  17 {
  18 };
  19 struct _IO_FILE_plus
  20 {
  21   _IO_FILE file;
  22 };
  23 extern const struct _IO_jump_t _IO_file_jumps_maybe_mmap ;
  24 extern const struct _IO_jump_t _IO_wfile_jumps;
  25 extern const struct _IO_jump_t _IO_wfile_jumps_maybe_mmap ;
  26
  27 _IO_new_fdopen (fd, mode)
  28      const char *mode;
  29 {
  30   int read_write;
  31   int posix_mode = 0;
  32   struct locked_FILE
  33   {
  34     struct _IO_FILE_plus fp;
  35     struct _IO_wide_data wd;
  36   } *new_f;
  37   int fd_flags;
  38   int use_mmap = 0;
  39     {
  40   }
  41     {
  42       switch (*++mode)
  43  {
  44  case '\0':
  45    use_mmap = 1;
  46  }
  47     }
  48   if (((fd_flags & 0003) == 00 && !(read_write & 8))
  49       || ((fd_flags & 0003) == 01 && !(read_write & 4)))
  50     {
  51     }
  52   if ((posix_mode & 02000) && !(fd_flags & 02000))
  53     return ((void *)0);
  54   _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd,
  55         (use_mmap && (read_write & 8))
  56         ? &_IO_wfile_jumps_maybe_mmap :
  57         &_IO_wfile_jumps);
  58     (use_mmap && (read_write & 8)) ? &_IO_file_jumps_maybe_mmap :
  59   _IO_file_init (&new_f->fp);
  60 }