[Bug tree-optimization/59586] New: Segmentation fault with -Ofast -floop-parallelize-all -ftree-parallelize-loops

["chaosgate at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59586

            Bug ID: 59586
           Summary: Segmentation fault with -Ofast -floop-parallelize-all
                    -ftree-parallelize-loops
           Product: gcc
           Version: 4.8.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chaosgate at gmail dot com

Created attachment 31504
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31504&action=edit
Test case

This code results in the following segfault when compiled with
gfortran -o /dev/null -c -Ofast -floop-parallelize-all
-ftree-parallelize-loops=1 -fopenmp t3.f


t3.f: In function ‘subsm’:
t3.f:1:0: internal compiler error: Segmentation fault
       subroutine subsm ( n, x, xp, xx)
 ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.



gcc -v:

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.8.2/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/paludis/build/sys-devel-gcc-4.8.2/work/gcc-4.8.2/configure
--prefix=/usr --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu
--mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share
--sysconfdir=/etc --localstatedir=/var/lib --disable-silent-rules
--enable-fast-install --libdir=/usr/lib64 --cache-file=config.cache
--libdir=/usr/lib64 --with-pkgversion='exherbo gcc-4.8.2' --program-suffix=-4.8
--disable-bootstrap --enable-clocale=gnu --enable-languages=c,c++,fortran,java
--enable-lto --disable-multilib --enable-nls --enable-serial-configure
--enable-libquadmath --enable-libquadmath-support --with-cloog --enable-libgomp
--disable-libobjc --disable-libssp --with-as=x86_64-pc-linux-gnu-as
--with-ld=x86_64-pc-linux-gnu-ld --with-system-zlib
Thread model: posix
gcc version 4.8.2 (exherbo gcc-4.8.2)
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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/59586] Segmentation fault with -Ofast -floop-parallelize-all -ftree-parallelize-loops
Date: Mon, 23 Dec 2013 21:49:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY586

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-12-23
     Ever confirmed|0                           |1

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Confirmed for 4.8.2 and trunk with -O3 -ffast-math -floop-parallelize-all, but
no ICE for 4.5.4, 4.6.4, and 4.7.3. Likely a 4.8/4.9 regression. I'll try to
bisect when I find some time.