Re: CVS GCC infinite loop

[Toshiyasu Morita <tm at netcom dot com>]

I just checked, and my source tree does include Jeff's LCM mods,
so even with the LCM improvements it's still very slow:

Wed Nov 10 15:56:16 1999  Jeffrey A Law  (law@cygnus.com)

        * flow.c (compute_flow_dominators): Initially put all blocks on
        the worklist.
        * lcm.c (compute_antinout_edge, compute_available): Similarly.
        * gcse.c (compute_cprop_avinout): Remove.
        (compute_cprop_data): Use compute_available.
        (delete_null_pointer_checks_1): Use compute_available.

        * basic-block.h (compute_available): Returns a void now.
        * gcse.c (one_classic_gcse_pass): Do not expect compute_available
        to return a value anymore.
        * lcm.c (compute_available, compute_antinout_edge): Revamp to use
        worklists.  Fix boundary cases. Compute maximal solutions.
        (compute_laterin, compute_nearerout): Similarly.

        * dwarf2out.c (add_AT_location_description): Allow
        (mem (plus (pseudo) (...)) too.

Toshi

> 
> Ooops, I spoke too soon.
> 
> It took around 12 minutes to compile this file on a PPro 200.
> This seems excessively long.
> 
> Toshi
> 
> > 
> > 
> > version: CVS 11/11/99
> >    host: Red Hat Linux 5.2 x86
> >  target: sh-elf
> > options: -O2 -m4 -S -g
> > 
> > cc1plus goes into an infinite loop compiling the function "EditorLoop"
> > in the file "editloop.ii".
> > 
> > Here's a last few lines generated by cc1plus:
> > 
> > ./editloop.ii:5849: candidates are: menu_c::menu_c ()
> > ./editloop.ii:5851:                 menu_c::menu_c (const char *, ...)
> > ./editloop.ii:5856:                 menu_c::menu_c (const char *, 
> > al_llist_t *, const char *(*) (void *))
> > ./editloop.ii:5865:                 menu_c::menu_c (const char *, int, 
> > int *, char **, const i8 *, const int *, int *)
> > ./editloop.ii:6014:                 menu_c::menu_c (const menu_c &)
> >  void EditorLoop (const char *) {GC 5751k -> 2928k in 0.140}
> > 
> > It's been sitting here for about 5 minutes doing nothing, so I'm assuming 
> > it's gone into an infinite loop.
> > 
> > The file "editloop.ii" is from stress-1.12.tar.gz at:
> > 
> > ftp://shell14.ba.best.com/pub.t/tm2/stress-1.12.tar.gz
> > 
> > Toshi
> > 
> 
>