[Bug bootstrap/39631] New: f951 seg faults while building libgfortran

[Bug bootstrap/39631] New: f951 seg faults while building libgfortran

[sje at cup dot hp dot com]

f951 generates a seg fault while building on hppa1.1-hp-hpux11.11.  It can be
reproduced by compiling the following fortran code with -O2 optimization:

elemental function gfortran_specific_dim_r16 (p1, p2)
   real (kind=16), intent (in) :: p1, p2
   real (kind=16) :: gfortran_specific_dim_r16
   gfortran_specific_dim_r16 = dim (p1, p2)
end function

The segfault is coming from the ira_assert in ira_reuse_stack_slot at line 2966
of ira-color.c.  allocno is NULL but gets dereferenced in the
ALLOCNO_HARD_REGNO macro.

It started failing sometime before r145385 and after r145268.  During that
period the compiler was not building correctly on PA so I don't yet know
exactly what change broke it.


-- 
           Summary: f951 seg faults while building libgfortran
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: build
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sje at cup dot hp dot com
GCC target triplet: hppa1.1-hp-hpux11.11


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39631

[Bug bootstrap/39631] f951 seg faults while building libgfortran

[sje at cup dot hp dot com]

------- Comment #1 from sje at cup dot hp dot com  2009-04-03 21:18 -------
Putting in a workaround to fix another build problem allowed me to track this
problem down as starting with version r145309:

2009-03-30  Vladimir Makarov  <vmakarov@redhat.com>

        * reload.c (push_reload, find_dummy_reload): Use df_get_live_out
        instead of DF_LR_OUT.

        * ira-lives.c (process_bb_node_lives): Ditto.

        * ira-color.c (ira_loop_edge_freq): Use df_get_live_{out,in}
        instead of DF_LR_{OUT,IN}.

        * ira-emit.c (generate_edge_moves, add_ranges_and_copies): Ditto.

        * ira-build.c (create_bb_allocnos, create_loop_allocnos): Ditto.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39631

[Bug bootstrap/39631] f951 seg faults while building libgfortran

[hjl dot tools at gmail dot com]

------- Comment #2 from hjl dot tools at gmail dot com  2009-04-03 21:31 -------
Can you try comment #3 in PR 39607?


-- 

hjl dot tools at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hjl dot tools at gmail dot
                   |                            |com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39631

[Bug bootstrap/39631] f951 seg faults while building libgfortran

[vmakarov at redhat dot com]

------- Comment #3 from vmakarov at redhat dot com  2009-04-03 21:36 -------
Steve, thanks for tracking it down. I did not reproduce the bug on x86-hppa
cross compiler.  Therefore finding the patch is important to me.

This is not a single problem introduced by the patch.  Another one is PR39607. 
Kenny pointed to me that IRA should use LIVE (not LR) info.  I had some doubts
therefore I did not commit the patch before the 4.4 branch creation.  Now I see
that the patch creates too many problems. So I am going to revert it.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39631

[Bug bootstrap/39631] f951 seg faults while building libgfortran

[sje at cup dot hp dot com]

------- Comment #4 from sje at cup dot hp dot com  2009-04-03 21:40 -------
> Can you try comment #3 in PR 39607?

I tried that change but it did not fix the problem.  Looks like Vladimir is
going to revert the entire patch.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39631

[Bug bootstrap/39631] f951 seg faults while building libgfortran

[hjl at gcc dot gnu dot org]

------- Comment #5 from hjl at gcc dot gnu dot org  2009-04-03 22:25 -------
Subject: Bug 39631

Author: hjl
Date: Fri Apr  3 22:25:32 2009
New Revision: 145522

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=145522
Log:
Mention

        PR rtl-optimization/39607
        PR rtl-optimization/39631

in ChangeLog for revision 145521.

Modified:
    trunk/gcc/ChangeLog


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39631

[Bug bootstrap/39631] f951 seg faults while building libgfortran

[danglin at gcc dot gnu dot org]

------- Comment #6 from danglin at gcc dot gnu dot org  2009-04-12 18:43 -------
This is fixed in my builds.  Steve, if this is still a problem,
you can reopen.


-- 

danglin at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39631