[Bug rtl-optimization/49007] ICE in extract_true_false_edges_from_block at tree-cfg.c:7379

[dave at hiauly1 dot hia.nrc.ca]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49007

--- Comment #20 from dave at hiauly1 dot hia.nrc.ca 2011-05-23 18:52:27 UTC ---
On Mon, 23 May 2011, ebotcazou at gcc dot gnu.org wrote:

> > This code fails to handle the case where there already is a use.
> 
> This should have been fixed in 4.5 and above:
> 
>         PR rtl-optimization/40086
>         * reorg.c (relax_delay_slots): When looking for redundant insn at
>         the branch target, use next_real_insn, not next_active_insn.

Yes, looks like the fix.  This appears to be a regression given the comment
about using next_real_insn in fill_simple_delay_slots.

Ok to backport this fix after testing to 4.3 and 4.4?  I would also
like to backport this fix

    PR rtl-optimization/42775
    * cfgrtl.c (rest_of_pass_free_cfg): Recompute notes if delay slot
    scheduling is enabled.

Hopefully, this will fix delay branch handling on these branches.

Dave