[Bug c++/55355] New: internal compiler error: in tree_low_cst, at tree.c:6415

[Bug c++/55355] New: internal compiler error: in tree_low_cst, at tree.c:6415

[rcp at sentientmeat dot ca]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

             Bug #: 55355
           Summary: internal compiler error: in tree_low_cst, at
                    tree.c:6415
    Classification: Unclassified
           Product: gcc
           Version: 4.6.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: rcp@sentientmeat.ca


Created attachment 28711
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28711
Minimal C++ file to reproduce gcc 3.4.6 ICE in tree_low_cst, at tree.c:6415

The attached file produces the following error when compiled with gcc 3.4.6:

$ /usr/local/gcc-4.6.3/bin/g++ -O2 -save-temps -c test.cpp
test.cpp: In member function 'void C::funcC()':
test.cpp:34:1: internal compiler error: in tree_low_cst, at tree.c:6415
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

gcc 3.4.6 is configured thusly:

$ /usr/local/gcc-4.6.3/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/usr/local/gcc-4.6.3/bin/g++
COLLECT_LTO_WRAPPER=/usr/local/gcc-4.6.3/bin/../libexec/gcc/i686-pc-linux-gnu/4.6.3/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.6.3/configure --prefix=/opt/soldev/gcc-4.6.3
--with-gnu-as --with-gnu-ld --disable-libgcj --enable-languages=c,c++
Thread model: posix
gcc version 4.6.3 (GCC)

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[rcp at sentientmeat dot ca]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

--- Comment #1 from Richard Perrin <rcp at sentientmeat dot ca> 2012-11-16 17:23:11 UTC ---
Oops:
s/3.4.6/4.6.3/ on all above.

All references to gcc 3.4.6 should actually be gcc 4.6.3.  I'm apparently
dyslexic or something today.

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-11-16 17:30:55 UTC ---
I can't reproduce this on x86_64-linux, neither -m64 nor -m32. Tried 4.6.3,
current 4_6-branch, 4_7-branch and mainline.

Somebody can?

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[rcp at sentientmeat dot ca]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

--- Comment #3 from Richard Perrin <rcp at sentientmeat dot ca> 2012-11-16 17:50:30 UTC ---
(In reply to comment #2)
> I can't reproduce this on x86_64-linux, neither -m64 nor -m32. Tried 4.6.3,
> current 4_6-branch, 4_7-branch and mainline.

I have tried 4.7.1 and 4.7.2 on the same systems, built with the same
configuration, and can confirm that neither of these versions suffers from this
problem. (Other issues prevent us from adopting those versions.)

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

Paolo Carlini <paolo.carlini at oracle dot com> changed:

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

--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-11-18 13:52:53 UTC ---
Thanks. Closing.

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[rcp at sentientmeat dot ca]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

Richard Perrin <rcp at sentientmeat dot ca> changed:

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

--- Comment #5 from Richard Perrin <rcp at sentientmeat dot ca> 2012-11-19 16:18:58 UTC ---
I really am relying on a fix in 4_6-branch (perhaps back-port of the fix that's
in 4.7?). Other issues prevent us from adopting gcc 4.7.

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

Paolo Carlini <paolo.carlini at oracle dot com> changed:

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

--- Comment #6 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-11-19 17:19:45 UTC ---
Very unlikely. If you find the patch which fixed it, and it's simple enough,
send a message to gcc or gcc-patches and try to ask.

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[rcp at sentientmeat dot ca]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

--- Comment #7 from Richard Perrin <rcp at sentientmeat dot ca> 2012-11-19 17:24:14 UTC ---
So 4.6 branch is dead? Or no more i386 support?

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-11-19 17:25:08 UTC ---
Note that, as I said already, I can't reproduce anywhere, not even in current
4_6-branch (on x86_64-linux -m32). Did you actually try it?

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[rcp at sentientmeat dot ca]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

--- Comment #9 from Richard Perrin <rcp at sentientmeat dot ca> 2012-11-20 15:45:06 UTC ---
(In reply to comment #8)
> Note that, as I said already, I can't reproduce anywhere, not even in current
> 4_6-branch (on x86_64-linux -m32). Did you actually try it?

I have reproduced the ICE in an i386 build of gcc-4_6-branch at r193571.

I then switched to an x86_64-linux platform and built gcc from the same
codebase, and could not reproduce the ICE with the x86_64 gcc binary against
the test code.

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[rcp at sentientmeat dot ca]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

Richard Perrin <rcp at sentientmeat dot ca> changed:

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

--- Comment #10 from Richard Perrin <rcp at sentientmeat dot ca> 2012-11-22 14:52:43 UTC ---
I am re-opening given comment 9 which provides an additional and apparently
necessary reproduction ingredient, namely an i386 platform build. Let me know
if there's other info necessary, or if you still cannot reproduce.

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

--- Comment #11 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-11-22 15:04:23 UTC ---
Still, you reported the issue as fixed in 4_7-branch, thus unless you think
it's a regression, it seems highly unlikely that it will be fixed in that
branch too, unless you volunteer to actively work on the issue. But by now I
think you know that.

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

Mikael Pettersson <mikpe at it dot uu.se> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mikpe at it dot uu.se

--- Comment #12 from Mikael Pettersson <mikpe at it dot uu.se> 2012-11-22 23:25:45 UTC ---
It's a HWI32 bug.

The ICE reproduces on x86 with 4.6 branch if you build a 32-bit compiler that
targets 32-bit x86; passing -m32 to a 64-bit compiler won't trigger it.

The ICE was silenced on 32-bit x86 for 4.7 by r176871:
http://gcc.gnu.org/ml/gcc-cvs/2011-07/msg01139.html
which is when HJ made 32-bit x86 HWI64.

The ICE reproduces with current 4.7 and 4.8 in 32-bit compilers with HWI32
targets; for instance an i686 to m68k linux cross says:

pr55355.cc: In member function 'void C::funcC()':
pr55355.cc:34:1: internal compiler error: in tree_low_cst, at tree.c:6603
 }
 ^
0x856174f tree_low_cst(tree_node const*, int)
        /mnt/scratch/gcc-4.8-20121118/gcc/tree.c:6603
0x856179e int_bit_position(tree_node const*)
        /mnt/scratch/gcc-4.8-20121118/gcc/tree.c:2480
0x846af0b type_internals_preclude_sra_p
        /mnt/scratch/gcc-4.8-20121118/gcc/tree-sra.c:719
0x846af0b type_internals_preclude_sra_p
        /mnt/scratch/gcc-4.8-20121118/gcc/tree-sra.c:678
0x8471e1f find_param_candidates
        /mnt/scratch/gcc-4.8-20121118/gcc/tree-sra.c:3627
0x8471e1f ipa_early_sra
        /mnt/scratch/gcc-4.8-20121118/gcc/tree-sra.c:4928
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |jamborm at gcc dot gnu.org

--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-11-23 09:14:18 UTC ---
If we want to support this (I'm actually surprised we just don't error on
this), then all users of int_bit_position needs to be guarded with
host_integerp (bit_position (), 0).  Some of them are, e.g. dwarf2out.c,
expr.c, others aren't (devirt in ipa-prop.c/gimple-fold.c, tree-sra.c e.g.).

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[rcp at sentientmeat dot ca]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

--- Comment #14 from Richard Perrin <rcp at sentientmeat dot ca> 2012-11-23 16:05:48 UTC ---
gcc 4.5.4 does not suffer from the problem compiling the attached repro code,
indicating this is a 4.6 regression.

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

--- Comment #15 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-12-09 01:37:57 UTC ---
a 256MB buffer.

[Bug c++/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[jamborm at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

Martin Jambor <jamborm at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2012-12-12
         AssignedTo|unassigned at gcc dot       |jamborm at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

--- Comment #16 from Martin Jambor <jamborm at gcc dot gnu.org> 2012-12-12 16:24:37 UTC ---
OK, I'll add the condition to type_internals_preclude_sra_p.

[Bug tree-optimization/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[jamborm at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

Martin Jambor <jamborm at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                URL|                            |http://gcc.gnu.org/ml/gcc-p
                   |                            |atches/2012-12/msg00969.htm
                   |                            |l

--- Comment #17 from Martin Jambor <jamborm at gcc dot gnu.org> 2012-12-14 12:06:21 UTC ---
I have submitted a fix to the mailing list:

http://gcc.gnu.org/ml/gcc-patches/2012-12/msg00969.html

[Bug tree-optimization/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[jamborm at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

--- Comment #18 from Martin Jambor <jamborm at gcc dot gnu.org> 2012-12-21 22:06:42 UTC ---
Author: jamborm
Date: Fri Dec 21 22:06:38 2012
New Revision: 194682

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=194682
Log:
2012-12-21  Martin Jambor  <mjambor@suse.cz>

    PR tree-optimization/55355
    * tree-sra.c (type_internals_preclude_sra_p): Also check that
    bit_position is small enough to fit a single HOST_WIDE_INT.

    * testsuite/g++.dg/torture/pr55355.C: New test.


Added:
    trunk/gcc/testsuite/g++.dg/torture/pr55355.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-sra.c

[Bug tree-optimization/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[jamborm at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

--- Comment #19 from Martin Jambor <jamborm at gcc dot gnu.org> 2012-12-21 22:21:20 UTC ---
Author: jamborm
Date: Fri Dec 21 22:21:14 2012
New Revision: 194684

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=194684
Log:
2012-12-21  Martin Jambor  <mjambor@suse.cz>

    PR tree-optimization/55355
    * tree-sra.c (type_internals_preclude_sra_p): Also check that
    bit_position is small enough to fit a single HOST_WIDE_INT.

    * testsuite/g++.dg/torture/pr55355.C: New test.


Added:
    branches/gcc-4_7-branch/gcc/testsuite/g++.dg/torture/pr55355.C
Modified:
    branches/gcc-4_7-branch/gcc/ChangeLog
    branches/gcc-4_7-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_7-branch/gcc/tree-sra.c

[Bug tree-optimization/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[jamborm at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

--- Comment #20 from Martin Jambor <jamborm at gcc dot gnu.org> 2012-12-21 22:28:45 UTC ---
Author: jamborm
Date: Fri Dec 21 22:28:40 2012
New Revision: 194686

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=194686
Log:
2012-12-21  Martin Jambor  <mjambor@suse.cz>

    PR tree-optimization/55355
    * tree-sra.c (type_internals_preclude_sra_p): Also check that
    bit_position is small enough to fit a single HOST_WIDE_INT.

    * testsuite/g++.dg/torture/pr55355.C: New test.


Added:
    branches/gcc-4_6-branch/gcc/testsuite/g++.dg/torture/pr55355.C
Modified:
    branches/gcc-4_6-branch/gcc/ChangeLog
    branches/gcc-4_6-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_6-branch/gcc/tree-sra.c

[Bug tree-optimization/55355] internal compiler error: in tree_low_cst, at tree.c:6415

[jamborm at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55355

Martin Jambor <jamborm at gcc dot gnu.org> changed:

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

--- Comment #21 from Martin Jambor <jamborm at gcc dot gnu.org> 2012-12-21 22:31:02 UTC ---
Fixed.