[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 at gcc dot gnu dot org>]

------- 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));


-- 


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