[Bug rtl-optimization/32355] [4.3 Regression] ICE in df_lr_verify_transfer_functions, at df-problems.c:1924

["zadeck at naturalbridge dot com" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #4 from zadeck at naturalbridge dot com  2007-06-18 16:48 -------
Subject: Re:  [4.3 Regression] ICE in df_lr_verify_transfer_functions,
 at df-problems.c:1924

committed as revision 125812

zadeck at naturalbridge dot com wrote:
> ------- Comment #1 from zadeck at naturalbridge dot com  2007-06-17 20:13 -------
> Subject: Re:  [4.3 Regression] ICE in df_lr_verify_transfer_functions,
>  at df-problems.c:1924
>
> There are possibly two problems here.  Fixing the first one fixes this ice.
>
> The first problem is that after a call to cse_main, a call to
> df_finish_pass is needed to get out of deferred rescanning mode and get
> everything up to date. 
>
> The possible second problem is that something in one of
>
> delete_trivially_dead_insns
> rebuild_jump_labels
> cleanup_cfg
>
> may not work in deferred rescanning mode.  This will wait for another
> bug report.
> It is too hard to debug this without first cleaning up what cse_main did
> and that makes the bug go away.
>
> ok to commit?
>
> Kenny
>
> 2007-06-17  Kenneth Zadeck <zadeck@naturalbridge.com>
>
>     PR middle-end/32355
>     * gcse (rest_of_handle_gcse): Add call to df_finish_pass after
>     cse_main.
>     * df-problems.c (df_note_bb_compute): Fix dumping info.
>
> 2007-06-17  Kenneth Zadeck <zadeck@naturalbridge.com>
>
>     * gcc.c-torture/compile/pr32355.c: New testcase.
>
> Index: testsuite/gcc.c-torture/compile/pr32355.c
> ===================================================================
> --- testsuite/gcc.c-torture/compile/pr32355.c   (revision 0)
> +++ testsuite/gcc.c-torture/compile/pr32355.c   (revision 0)
> @@ -0,0 +1,33 @@
> +/* { dg-options "-O3" } */
> +
> +typedef struct
> +{
> +}
> +__sigset_t;
> +typedef struct
> +{
> +    char coredump;
> +}
> +EMode;
> +extern EMode Mode;
> +struct sigaction
> +{
> +  __sigset_t sa_mask;
> +  int sa_flags;
> +};
> +doSignalsSetup (void)
> +{
> +  static const int signals[] = {
> +    1, 2 , 3, 4, 6, 8, 11, 13, 14, 15, 10, 12, 17, 7
> +  };
> +  unsigned int i, sig;
> +  struct sigaction sa;
> +  for (i = 0; i < sizeof (signals) / sizeof (int); i++)
> +    {
> +      sig = signals[i];
> +      if (Mode.coredump && (sig == 4 || sig == 8))
> +        continue;
> +      sa.sa_flags = (sig == 17);
> +      sigemptyset (&sa.sa_mask);
> +    }
> +}
> Index: gcse.c
> ===================================================================
> --- gcse.c      (revision 125777)
> +++ gcse.c      (working copy)
> @@ -6704,6 +6704,7 @@ rest_of_handle_gcse (void)
>      {
>        timevar_push (TV_CSE);
>        tem2 = cse_main (get_insns (), max_reg_num ());
> +      df_finish_pass ();
>        purge_all_dead_edges ();
>        delete_trivially_dead_insns (get_insns (), max_reg_num ());
>        timevar_pop (TV_CSE);
> Index: df-problems.c
> ===================================================================
> --- df-problems.c       (revision 125777)
> +++ df-problems.c       (working copy)
> @@ -3867,8 +3867,10 @@ df_note_bb_compute (unsigned int bb_inde
>    for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
>      {
>        struct df_ref *def = *def_rec;
> +#ifdef REG_DEAD_DEBUGGING
>        if (dump_file)
>         fprintf (dump_file, "artificial def %d\n", DF_REF_REGNO (def));
> +#endif
>
>        if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
>         bitmap_clear_bit (live, DF_REF_REGNO (def));
>
>
>   


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32355