[Bug c/40087] New: Bad assembly for -O2

[markus at cs dot wisc dot edu]

This is gcc-4.3.3 in Gentoo, compiled with CHOST=i686-pc-linux-gnu and the
configure arguments:
--prefix=/usr --bindir=/usr/i686-pc-linux-gnu/gcc-bin/4.3.3
--includedir=/usr/lib/gcc/i686-pc-linux-gnu/4.3.3/include
--datadir=/usr/share/gcc-data/i686-pc-linux-gnu/4.3.3
--mandir=/usr/share/gcc-data/i686-pc-linux-gnu/4.3.3/man
--infodir=/usr/share/gcc-data/i686-pc-linux-gnu/4.3.3/info
--with-gxx-include-dir=/usr/lib/gcc/i686-pc-linux-gnu/4.3.3/include/g++-v4
--host=i686-pc-linux-gnu --build=i686-pc-linux-gnu --disable-altivec
--disable-fixed-point --enable-nls --without-included-gettext
--with-system-zlib --disable-checking --disable-werror --enable-secureplt
--disable-multilib --enable-libmudflap --disable-libssp --enable-libgomp
--enable-cld --enable-java-awt=gtk --with-arch=i686
--enable-languages=c,c++,java,treelang,fortran --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.3.3-r2 p1.1,
pie-10.1.5'

Some simple code works with -O1 but not -O2.  I'll attach the C file and the
disassembly from objdump.  I'm no good with assembly, but I find it weird that
'last' is decremented by 8 at one point.


-- 
           Summary: Bad assembly for -O2
           Product: gcc
           Version: 4.3.3
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: markus at cs dot wisc dot edu
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40087