[Bug c++/26913] New: ICE with -fopenmp and -O2

[Bug c++/26913] New: ICE with -fopenmp and -O2

[Georg dot Baum at post dot rwth-aachen dot de]

I get a ICE in g++ for the following code when compiled with -fopenmp and -O2:

#include <string>

int foo()
{
        int x1;
#pragma omp parallel
        {
                for (int i = 0; i < 5; ++i) {
                        std::string xxx;
                }
        }
        return 0;
}

Note that this is not exactly bug 26823, since the function name where the ICE
occurs is not printed. I tried to replace std::string with something else, but
then the ICE disappears. This is with svn from yesterday: g++-4.2 (GCC) 4.2.0
20060328 (experimental)


-- 
           Summary: ICE with -fopenmp and -O2
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: Georg dot Baum at post dot rwth-aachen dot de
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26913

[Bug c++/26913] ICE with -fopenmp and -O2

[reichelt at gcc dot gnu dot org]

------- Comment #1 from reichelt at gcc dot gnu dot org  2006-03-29 15:44 -------
Confirmed.
Reduced testcase (compile with "g++ -fopenmp"):

=======================================
struct A
{
  ~A() throw();
};

void foo(A);

A bar() throw();

void baz()
{
#pragma omp parallel
    { A a; foo(bar()); }
}
=======================================

PR26913.cc: In function 'void _Z3bazv.omp_fn.0(void*)':
PR26913.cc:12: internal compiler error: Segmentation fault
Please submit a full bug report, [etc.]

Although this is a plain segfault in contrast to PR26823, I think the
two are related, since both have to do with exception handling:
If you get gid of "throw()" in the testcase above, the code compiles fine.
And the ICE in PR26823 happens in add_stmt_to_eh_region_fn.

While reducing to testcase above, I also came across error messages like
in PR26084/PR26076 (vector VEC(eh_region,base) index domain) - the
predecessors of PR26823.

Looks like we some major problem with exception handling here.


-- 

reichelt at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |reichelt at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |ice-on-valid-code,
                   |                            |monitored, openmp
   Last reconfirmed|0000-00-00 00:00:00         |2006-03-29 15:44:04
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26913

[Bug middle-end/26913] ICE with -fopenmp and -O1

[pinskia at gcc dot gnu dot org]

------- Comment #2 from pinskia at gcc dot gnu dot org  2006-04-02 08:01 -------
Backtrace:
#0  0x00351810 in can_throw_internal_1 (region_number=0, is_resx=1 '\001') at
../../gcc/except.c:2655
#1  0x00601484 in tree_can_throw_internal (stmt=0x434ed5a0) at
../../gcc/tree-eh.c:2031
#2  0x0067ff74 in tree_purge_dead_eh_edges (bb=0x434ee1e0) at
../../gcc/tree-cfg.c:5386
#3  0x0064310c in execute_fixup_cfg () at ../../gcc/tree-optimize.c:263
#4  0x00575718 in execute_one_pass (pass=0xca8270) at ../../gcc/passes.c:863
#5  0x00575944 in execute_pass_list (pass=0xca8270) at ../../gcc/passes.c:910


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c++                         |middle-end
  GCC build triplet|i686-pc-linux-gnu           |
   GCC host triplet|i686-pc-linux-gnu           |
 GCC target triplet|i686-pc-linux-gnu           |
            Summary|ICE with -fopenmp and -O2   |ICE with -fopenmp and -O1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26913

[Bug middle-end/26913] ICE with -fopenmp and -O1

[jakub at gcc dot gnu dot org]

-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |jakub at gcc dot gnu dot org
                   |dot org                     |
                URL|                            |http://gcc.gnu.org/ml/gcc-
                   |                            |patches/2006-
                   |                            |04/msg00662.html
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2006-03-29 15:44:04         |2006-04-18 13:50:13
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26913

[Bug middle-end/26913] ICE with -fopenmp and -O1

[jakub at gcc dot gnu dot org]

------- Comment #3 from jakub at gcc dot gnu dot org  2006-04-26 08:24 -------
Subject: Bug 26913

Author: jakub
Date: Wed Apr 26 08:24:28 2006
New Revision: 113270

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=113270
Log:
        PR middle-end/26913
        * tree-cfg.c (find_outermost_region_in_block): Handle RESX_EXPR.

        * g++.dg/gomp/pr26913.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/gomp/pr26913.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-cfg.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26913

[Bug middle-end/26913] ICE with -fopenmp and -O1

[jakub at gcc dot gnu dot org]

------- Comment #4 from jakub at gcc dot gnu dot org  2006-04-26 08:29 -------
Fixed in SVN.


-- 

jakub at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26913

[Bug middle-end/26913] ICE with -fopenmp and -O1

[Georg dot Baum at post dot rwth-aachen dot de]

------- Comment #5 from Georg dot Baum at post dot rwth-aachen dot de  2006-04-26 14:39 -------
The test case does indeed not trigger the ICE anymore, but I have a similar new
one: PR27325.


-- 

Georg dot Baum at post dot rwth-aachen dot de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |VERIFIED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26913

[Bug middle-end/26913] ICE with -fopenmp and -O1

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.2.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26913