[Bug tree-optimization/58011] New: GCC segfaults at -O1

[Bug tree-optimization/58011] New: GCC segfaults at -O1

[antoine.balestrat at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58011

            Bug ID: 58011
           Summary: GCC segfaults at -O1
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: antoine.balestrat at gmail dot com

Using GCC 4.9.0 as of 20130728 :

$ cat seg.c
int a, b;

void f(unsigned p)
{
    unsigned *pp = &p;

    if(!a)
        p = 0;

    for(b = 0; b < 1; b++)
        if(3 * p + 5 * *pp)
            a = 0;
}

$ xgcc -O1 seg.c
seg.c: In function ‘f’:
seg.c:3:6: internal compiler error: Segmentation fault
 void f(unsigned p)
      ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/58009] Elements with same value in vector subscript in variable definition context
Date: Sun, 28 Jul 2013 11:05:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX009

--- Comment #3 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
I also want to catch

a([i,j,i]) = ...

for which I cannot think of an algorithm which is O(n),
so I guess it will have to be O(n**2).

[Bug tree-optimization/58011] GCC segfaults at -O1

[olegendo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58011

Oleg Endo <olegendo at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-07-28
                 CC|                            |eraman at google dot com,
                   |                            |olegendo at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Oleg Endo <olegendo at gcc dot gnu.org> ---
With SVN rev 201282, SH cross compiler and -O2 I get:

 internal compiler error: Segmentation fault
 void f(unsigned p)
      ^
0x87a4250 crash_signal
    ../../gcc-trunk2/gcc/toplev.c:334
0x88f60c4 build_and_add_sum
    ../../gcc-trunk2/gcc/tree-ssa-reassoc.c:4473
0x88feb46 undistribute_ops_list
    ../../gcc-trunk2/gcc/tree-ssa-reassoc.c:1462
0x88ff334 reassociate_bb
    ../../gcc-trunk2/gcc/tree-ssa-reassoc.c:4244
0x88ff0e6 reassociate_bb
    ../../gcc-trunk2/gcc/tree-ssa-reassoc.c:4324
0x88ff0e6 reassociate_bb
    ../../gcc-trunk2/gcc/tree-ssa-reassoc.c:4324
0x88ff0e6 reassociate_bb
    ../../gcc-trunk2/gcc/tree-ssa-reassoc.c:4324
0x890118e do_reassoc
    ../../gcc-trunk2/gcc/tree-ssa-reassoc.c:4358
0x890118e execute_reassoc
    ../../gcc-trunk2/gcc/tree-ssa-reassoc.c:4440
Please submit a full bug report,

CC'ing Easwaran Raman who was the last to touch tree-ssa-reassoc.c according to
the changelog.

[Bug tree-optimization/58011] GCC segfaults at -O1

[eraman at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58011

--- Comment #2 from eraman at gcc dot gnu.org ---
Author: eraman
Date: Wed Sep  4 17:48:15 2013
New Revision: 202262

URL: http://gcc.gnu.org/viewcvs?rev=202262&root=gcc&view=rev
Log:
2013-09-04  Easwaran Raman  <eraman@google.com>

    PR middle-end/57370
    PR tree-optimization/58011
    * tree-ssa-reassoc.c (get_stmt_uid_with_default): New function,
    (build_and_add_sum): Use it.
    (appears_later_in_bb): Simplify code.

gcc/testsuite/ChangeLog:
2013-09-04  Easwaran Raman  <eraman@google.com>

    PR middle-end/57370
    PR tree-optimization/58011
    * gfortran.dg/reassoc_12.f90: New testcase.
    * gcc.dg/tree-ssa/reassoc-31.c: New testcase.


Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/reassoc-31.c
    trunk/gcc/testsuite/gfortran.dg/reassoc_12.f90
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-reassoc.c

[Bug tree-optimization/58011] GCC segfaults at -O1

[olegendo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58011

--- Comment #3 from Oleg Endo <olegendo at gcc dot gnu.org> ---
Is this done?  If so, can we close this PR?

[Bug tree-optimization/58011] GCC segfaults at -O1

[olegendo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58011

Oleg Endo <olegendo at gcc dot gnu.org> changed:

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

--- Comment #4 from Oleg Endo <olegendo at gcc dot gnu.org> ---
I take the silence as a 'yes'.