[Bug middle-end/49640] New: Internal compiler in C99 code (using variable-length arrays) and OpenMP

[Bug middle-end/49640] New: Internal compiler in C99 code (using variable-length arrays) and OpenMP

[doriankrause at web dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49640

           Summary: Internal compiler in C99 code (using variable-length
                    arrays) and OpenMP
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: doriankrause@web.de


Hello,

the attached code fails to compile with gcc 4.5.0 when enabling OpenMP:

[kraused@cub ~]$ gcc -c -std=gnu99 test.c
[kraused@cub ~]$ gcc -c -std=gnu99 -fopenmp test.c
test.c: In function 'convert_u8_f32.omp_fn.0':
test.c:31:9: internal compiler error: in expand_one_var, at cfgexpand.c:953
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

The gcc version is 4.5.0:

[kraused@cub ~]$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/share/apps/gcc/4.5.0/gcc_412/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ./configure --prefix=/share/apps/gcc/4.5.0/gcc_412
--with-mpfr=/share/apps/mpfr/2.4.2/gcc_412
--with-gmp=/share/apps/gmp/5.0.1/gcc_412
--with-mpc=/share/apps/mpc/0.8.2/gcc_412 --enable-languages=c,c++,fortran
Thread model: posix
gcc version 4.5.0 (GCC) 


Btw. the code also fails to compile with the 4.1.2 gcc on my RHEL box:

[kraused@icsprec03 ~]$ gcc -c -std=gnu99 -fopenmp convert.c 
convert.c: In function ‘convert_u8_s32.omp_fn.0’:
convert.c:27: internal compiler error: in make_decl_rtl, at varasm.c:893
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://bugzilla.redhat.com/bugzilla> for instructions.
Preprocessed source stored into /tmp/ccsIbyBy.out file, please attach this to
your bugreport.
[kraused@icsprec03 ~]$ gcc -v
Using built-in specs.
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--enable-checking=release --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-libgcj-multifile
--enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk
--disable-dssi --disable-plugin
--with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic
--host=x86_64-redhat-linux
Thread model: posix
gcc version 4.1.2 20080704 (Red Hat 4.1.2-50)


Unfortunately I don't have a newer gcc available right now for testing.

[Bug middle-end/49640] Internal compiler in C99 code (using variable-length arrays) and OpenMP

[doriankrause at web dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49640

--- Comment #1 from doriankrause at web dot de 2011-07-05 11:49:09 UTC ---
Created attachment 24688
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24688
The test code

[Bug middle-end/49640] Internal compiler in C99 code (using variable-length arrays) and OpenMP

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49640

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2011.07.07 09:11:25
         AssignedTo|unassigned at gcc dot       |jakub at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-07 09:11:25 UTC ---
Created attachment 24703
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24703
gcc47-pr49640.patch

Untested fix.

[Bug middle-end/49640] Internal compiler in C99 code (using variable-length arrays) and OpenMP

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49640

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-07 12:49:21 UTC ---
Author: jakub
Date: Thu Jul  7 12:49:17 2011
New Revision: 175967

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=175967
Log:
    PR middle-end/49640
    * gimplify.c (gimplify_compound_lval): For last 2 ARRAY_*REF
    operands and last COMPONENT_REF operand call gimplify_expr on it
    if non-NULL.

    * gcc.dg/gomp/pr49640.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/gomp/pr49640.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimplify.c
    trunk/gcc/testsuite/ChangeLog

[Bug middle-end/49640] Internal compiler in C99 code (using variable-length arrays) and OpenMP

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49640

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-07 12:50:08 UTC ---
Author: jakub
Date: Thu Jul  7 12:50:03 2011
New Revision: 175968

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=175968
Log:
    PR middle-end/49640
    * gimplify.c (gimplify_compound_lval): For last 2 ARRAY_*REF
    operands and last COMPONENT_REF operand call gimplify_expr on it
    if non-NULL.

    * gcc.dg/gomp/pr49640.c: New test.

Added:
    branches/gcc-4_6-branch/gcc/testsuite/gcc.dg/gomp/pr49640.c
Modified:
    branches/gcc-4_6-branch/gcc/ChangeLog
    branches/gcc-4_6-branch/gcc/gimplify.c
    branches/gcc-4_6-branch/gcc/testsuite/ChangeLog

[Bug middle-end/49640] Internal compiler in C99 code (using variable-length arrays) and OpenMP

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49640

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-07 12:58:22 UTC ---
Fixed for 4.6/4.7+ so far.

[Bug middle-end/49640] Internal compiler in C99 code (using variable-length arrays) and OpenMP

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49640

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-19 13:06:04 UTC ---
Author: jakub
Date: Tue Jul 19 13:06:00 2011
New Revision: 176455

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=176455
Log:
    Backport from mainline
    2011-07-07  Jakub Jelinek  <jakub@redhat.com>

    PR middle-end/49640
    * gimplify.c (gimplify_compound_lval): For last 2 ARRAY_*REF
    operands and last COMPONENT_REF operand call gimplify_expr on it
    if non-NULL.

    * gcc.dg/gomp/pr49640.c: New test.

Added:
    branches/gcc-4_5-branch/gcc/testsuite/gcc.dg/gomp/pr49640.c
Modified:
    branches/gcc-4_5-branch/gcc/ChangeLog
    branches/gcc-4_5-branch/gcc/gimplify.c
    branches/gcc-4_5-branch/gcc/testsuite/ChangeLog

[Bug middle-end/49640] Internal compiler in C99 code (using variable-length arrays) and OpenMP

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49640

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-19 19:33:34 UTC ---
Author: jakub
Date: Tue Jul 19 19:33:30 2011
New Revision: 176486

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=176486
Log:
    Backport from mainline
    2011-07-07  Jakub Jelinek  <jakub@redhat.com>

    PR middle-end/49640
    * gimplify.c (gimplify_compound_lval): For last 2 ARRAY_*REF
    operands and last COMPONENT_REF operand call gimplify_expr on it
    if non-NULL.

    * gcc.dg/gomp/pr49640.c: New test.

Added:
    branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/gomp/pr49640.c
Modified:
    branches/gcc-4_4-branch/gcc/ChangeLog
    branches/gcc-4_4-branch/gcc/gimplify.c
    branches/gcc-4_4-branch/gcc/testsuite/ChangeLog

[Bug middle-end/49640] Internal compiler in C99 code (using variable-length arrays) and OpenMP

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49640

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

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

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-07-19 19:52:03 UTC ---
Fixed.