[Bug c/43398] New: ICE with -O -floop-block

["scientica at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

I found that when I emerged libcaca 0.99 beta 16, I got 2 ICEs in demo.c 
and demo0.c. After some code cutting I got down to [attached demo.i]. Note that 
draw_circle isn't defined, it was a "real" function in libcaca's 
demo.c. Also, the there's an "-O" flag, removing it causes an error on
draw_circle (since it's not defined), adding this to the code below: 
     void draw_circle(int *a, int b, int c, int d, int e, int f){} 
will make the ICE go away (with or without -O). (I'm guessing it's not related
to the ICE, which I believe is caused by -floop-block alone)

I have these versions of the graphite dependencies installed:
   dev-libs/ppl-0.10.2-r1     USE="pch -doc -test -watchdog" 
   dev-libs/cloog-ppl-0.15.8

Here's the commandline with it's output:
$ LC_ALL=C gcc -v -save-temps -O -floop-block demo.c                            
Using built-in specs.                                                           
Target: x86_64-pc-linux-gnu                                                     
Configured with: /var/tmp/portage/sys-devel/gcc-4.4.3/work/gcc-4.4.3/configure
--prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.4.3
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.4.3/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.4.3
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.4.3/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.4.3/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.4.3/include/g++-v4
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec
--disable-fixed-point --with-ppl --with-cloog --enable-nls
--without-included-gettext --with-system-zlib --disable-checking
--disable-werror --enable-secureplt --enable-multilib --enable-libmudflap
--disable-libssp --enable-libgomp --enable-cld
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.4.3/python
--disable-libgcj --enable-objc-gc --enable-languages=c,c++,objc,obj-c++,fortran
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --with-bugurl=http://bugs.gentoo.org/
--with-pkgversion='Gentoo 4.4.3 p1.0'    
Thread model: posix
gcc version 4.4.3 (Gentoo 4.4.3 p1.0)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O' '-floop-block' '-mtune=generic'
 /usr/libexec/gcc/x86_64-pc-linux-gnu/4.4.3/cc1 -E -quiet -v demo.c
-D_FORTIFY_SOURCE=2 -mtune=generic -floop-block -O -fpch-preprocess -o demo.i
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/4.4.3/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.3/include
 /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.3/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O' '-floop-block' '-mtune=generic'
 /usr/libexec/gcc/x86_64-pc-linux-gnu/4.4.3/cc1 -fpreprocessed demo.i -quiet
-dumpbase demo.c -mtune=generic -auxbase demo -O -version -floop-block -o
demo.s
GNU C (Gentoo 4.4.3 p1.0) version 4.4.3 (x86_64-pc-linux-gnu)
        compiled by GNU C version 4.4.3, GMP version 4.3.1, MPFR version
2.4.1-p5.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: a82a244c7fb9c82fc087b2597e2d44f9
demo.c: In function 'main':
demo.c:2: internal compiler error: in expand_scalar_variables_expr, at
graphite.c:4295
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://bugs.gentoo.org/> for instructions.


-- 
           Summary: ICE with -O -floop-block
           Product: gcc
           Version: 4.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: scientica at gmail dot com
 GCC build triplet: x86_64-pc-linux-gnu
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43398