[Bug tree-optimization/23376] New: ICE on GCC 4.x with -O1 -funroll-loops -fvariable-expansion-in-unroller

["drab at kepler dot fjfi dot cvut dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

The example (attached below), when compiled by following gcc

-------------------
$ gcc -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../../../gcc-CVS-20050812/gcc-CVS-20050812/configure
--host=i686-pc-linux-gnu --prefix=/usr/local/opt/gcc-4.1
--exec-prefix=/usr/local/opt/gcc-4.1 --sysconfdir=/etc
--libdir=/usr/local/opt/gcc-4.1/lib --libexecdir=/usr/local/opt/gcc-4.1/libexec
--sharedstatedir=/var --localstatedir=/var --program-suffix=-4.1
--with-x-includes=/usr/X11R6/include --with-x-libraries=/usr/X11R6/lib
--enable-shared --enable-static --with-gnu-as --with-gnu-ld --with-stabs
--enable-threads=posix --enable-version-specific-runtime-libs --disable-coverage
--disable-libgcj --disable-checking --enable-multilib --with-x --enable-cmath
--enable-libstdcxx-debug --enable-fast-character --enable-hash-synchronization
--with-system-zlib --with-libbanshee --with-demangler-in-ld
--with-arch=athlon-xp --enable-libada --enable-languages=c,c++,f95,objc,ada
Thread model: posix
gcc version 4.1.0 20050812 (experimental)
---------------------

with

---------------------
g++ -O1 -funroll-loops -fvariable-expansion-in-unroller -c me_utils_mmx.cpp -o
me_utils_mmx.o
---------------------

results in this:

---------------------
me_utils_mmx.cpp: In function â??dirac::CalcValueType
dirac::simple_block_diff_up_mmx_4(const dirac::PicArray&, const
dirac::PicArray&, const dirac::ImageCoords&, const dirac::ImageCoords&, const
dirac::ImageCoords&, const dirac::ValueType*)â??:
me_utils_mmx.cpp:23841: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
---------------------

Tested on i686-pc-linux-gnu.

gcc version 4.0.2 20050804 (prerelease) fails the same way.
gcc version 3.4.3 (Mandrakelinux 10.2 3.4.3-7mdk) doesn't compile this at all
because of errors (should be because the included headers are from 4.1), perhaps
after reduction it might.

For x86_64 it fails as well, though it requires a patch (also attached) to
compile, again due to the includes from i686 GCC this time.

-- 
           Summary: ICE on GCC 4.x with -O1 -funroll-loops -fvariable-
                    expansion-in-unroller
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: drab at kepler dot fjfi dot cvut dot cz
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23376