http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55158
--- Comment #2 from Gary Funck <gary at intrepid dot com> 2012-11-01 00:35:41
UTC ---
I tried making the change suggested in the previous comment and ran into a
segfault here:
5876 dump_new_block_header (0, *target_bb, head, tail);
5877
5878 if (init_state == NULL)
5879 state_reset (curr_state);
5880 else
5881 memcpy (curr_state, init_state, dfa_state_size);
5882
5883 /* Clear the ready list. */
5884 ready.first = ready.veclen - 1;
5885 ready.n_ready = 0;
(gdb) p init_state
$10 = (state_t) 0x431
init_state is an invalid pointer.
Going up one level.
2985 curr_bb = first_bb;
2986 if (dbg_cnt (sched_block))
2987 {
2988 edge f;
2989
2990 schedule_block (&curr_bb, bb_state[first_bb->index]);
2991 gcc_assert (EBB_FIRST_BB (bb) == first_bb);
2992 sched_rgn_n_insns += sched_n_insns;
2993 f = find_fallthru_edge (last_bb->succs);
2994 if (f && f->probability * 100 / REG_BR_PROB_BASE >=
(gdb) p first_bb->index
$13 = 25
If the last basic block is 23, then this index is out-of-range.
