[Bug c/56940] New: internal compiler error: unrecognizable insn:

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56940

             Bug #: 56940
           Summary: internal compiler error: unrecognizable insn:
    Classification: Unclassified
           Product: gcc
           Version: 4.6.3
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: gcc.hall@gmail.com


Created attachment 29863
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29863
pre-processed source file

I know this is an old version of GCC, but it is the one distributed with the
current Debian (well, raspbian).

Version
-------

pi@raspberrypi ~ $ gcc -v      
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-gnueabihf/4.6/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: ../src/configure -v --with-pkgversion='Debian 4.6.3-14+rpi1'
--with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.6 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object
--enable-plugin --enable-objc-gc --disable-sjlj-exceptions --with-arch=armv6
--with-fpu=vfp --with-float=hard --enable-checking=release
--build=arm-linux-gnueabihf --host=arm-linux-gnueabihf
--target=arm-linux-gnueabihf
Thread model: posix
gcc version 4.6.3 (Debian 4.6.3-14+rpi1) 

Error
-----

gcc -pipe -std=gnu99 -funsigned-char -DFILE_TABS=4 -DSCREEN_TABS=2 -c g.c
-DEDITOR=0 -DLATIN8 -O3 -Wall -Wextra -Wunused -Wunreachable-code
-Wstrict-aliasing=3 -Wredundant-decls -Winline -Wundef -Wwrite-strings
-Wcast-qual -Wmissing-noreturn -Winit-self -Wformat=2 -Woverlength-strings
-Wlogical-op -Wshadow -Wstrict-prototypes -Wstrict-overflow=1
-Wmissing-include-dirs -Wold-style-definition -Wpointer-arith
-Wdisabled-optimization -Wredundant-decls -Wmissing-prototypes
-Wmissing-declarations -Wunused-parameter -Wno-char-subscripts -Wuninitialized
-Wunsafe-loop-optimizations -Waggregate-return -Wmissing-format-attribute
-Wsign-conversion -Wvariadic-macros -Wnormalized=nfc -Wnested-externs
-Wunused-macros -Wconversion -ffast-math -fno-reciprocal-math
-fno-associative-math -fwrapv -mfloat-abi=hard -mfpu=vfp -fwhole-program
-fomit-frame-pointer -fmerge-all-constants -fno-ident -fno-unwind-tables
-fno-asynchronous-unwind-tables -lm -lcurses -ldl -o /dev/null
g.c: In function 'print_val':
g.c:10360:1: error: unrecognizable insn:
(insn 1086 1085 1087 72 (set (subreg:SI (reg/v:DI 252 [ ival ]) 0)
        (sign_extend:SI (mem/s/c:QI (plus:SI (reg/f:SI 323)
                    (const_int 1672 [0x688])) [0 MEM[(const struct VALUE
*)&locals + 1248B].v.o+0 S1 A64]))) g.c:6373 -1
     (nil))
g.c:10360:1: internal compiler error: in extract_insn, at recog.c:2109
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.
Preprocessed source stored into /tmp/ccDnsSF8.out file, please attach this to
your bugreport.