[Bug fortran/37401] New: ICE when compiling some LAPACK files with optimizations

["jean-louis dot dornstetter at wanadoo dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

Compiling some of the LAPACK source code under -O1 or greater with the 64 bit
version of GNU Fortran 4.4.0 fails badly (whereas its peer 32 bit build does
not exhibit the problem).

The Windows build of gfortran is current from
<http://gcc.gnu.org/wiki/GFortranBinaries> as of Sep 6, 2008:
<http://quatramaran.ens.fr/~coudert/gfortran/gfortran-win64.zip>

gfortran -v:
Using built-in specs.
Target: x86_64-pc-mingw32
Configured with: ../../trunk/configure --prefix=/home/FX/irun64
--build=i586-pc-mingw32 --target=x86_64-pc-mingw32 --with-gmp=/home/FX/local
--enable-languages=c,fortran --disable-werror --disable-nls --enable-threads
Thread model: win32
gcc version 4.4.0 20080421 (experimental) [trunk revision 134506] (GCC)

Similar problems occur with numerous .f source files dealing with COMPLEX
versions of routines, the list of offending files within the current 3.1.1
version of LAPACK is provided later, one of them is chdet2.f:

Fine at optimization level 0 :
G:\lapack\SRC>gfortran -c -O0 chetd2.f

Things get weird here:
G:\lapack\SRC>gfortran -c -O1 chetd2.f
chetd2.f: In function 'chetd2':
chetd2.f:254: internal compiler error: in reg_overlap_mentioned_p, at
rtlanal.c:1398
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

G:\lapack\SRC>gfortran -c -O2 chetd2.f
chetd2.f: In function 'chetd2':
chetd2.f:254: error: invalid rtl sharing found in the insn
(insn 688 687 689 14 chetd2.f:190 (set (subreg:DI (reg:SC 191) 0)
        (reg:DI 427)) -1 (nil))
chetd2.f:254: error: shared rtx
(subreg:DI (reg:SC 191) 0)
chetd2.f:254: internal compiler error: internal consistency failure
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

The list of files that trigger similar problems in LAPACK 3.1.1 is provided
below, with the ancilliary TIMING utilities folder located at the same level as
SRC (none of the TESTING files seem to disturb the compiler):

\SRC\cgbcon.f
\SRC\chetd2.f
\SRC\chetri.f
\SRC\chgeqz.f
\SRC\chpgst.f
\SRC\chptrd.f
\SRC\chptri.f
\SRC\claein.f
\SRC\claesy.f
\SRC\clahqr.f
\SRC\claic1.f
\SRC\clapll.f
\SRC\claqr0.f
\SRC\claqr4.f
\SRC\clarfg.f
\SRC\clarnv.f
\SRC\clatbs.f
\SRC\clatdf.f
\SRC\clatps.f
\SRC\clatrd.f
\SRC\clatrs.f
\SRC\clauu2.f
\SRC\cpotf2.f
\SRC\cpptrf.f
\SRC\cpptri.f
\SRC\csptri.f
\SRC\csytri.f
\SRC\ctgevc.f
\SRC\ctgsna.f
\SRC\ctrsna.f
\SRC\ctrsyl.f
\TIMING\EIG\clatm4.f
\TIMING\EIG\ctim26.f
\TIMING\EIG\ctim51.f
\TIMING\EIG\ceispack.f
\TIMING\EIG\EIGSRC\chgeqz.f
\TIMING\EIG\EIGSRC\claein.f
\TIMING\EIG\EIGSRC\clahqr.f
\TIMING\EIG\EIGSRC\clarrv.f
\TIMING\EIG\EIGSRC\ctgevc.f
\TIMING\LIN\ctimmg.f
\TIMING\LIN\clinpk.f
\TIMING\LIN\LINSRC\claic1.f


-- 
           Summary: ICE when compiling some LAPACK files with optimizations
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jean-louis dot dornstetter at wanadoo dot fr
 GCC build triplet: i586-pc-mingw32
  GCC host triplet: x86_64-pc-mingw32
GCC target triplet: x86_64-pc-mingw32


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37401