[Bug c++/53707] New: compiler generates wrong code

[galtgendo at o2 dot pl]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53707

             Bug #: 53707
           Summary: compiler generates wrong code
    Classification: Unclassified
           Product: gcc
           Version: 4.6.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: galtgendo@o2.pl


Using built-in specs.
COLLECT_GCC=gcc-4.6.3
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i686-pc-linux-gnu/4.6.3/lto-wrapper
Target: i686-pc-linux-gnu
Configured with:
/mnt/workbox/builds/portage/sys-devel/gcc-4.6.3/work/gcc-4.6.3/configure
--prefix=/usr --bindir=/usr/i686-pc-linux-gnu/gcc-bin/4.6.3
--includedir=/usr/lib/gcc/i686-pc-linux-gnu/4.6.3/include
--datadir=/usr/share/gcc-data/i686-pc-linux-gnu/4.6.3
--mandir=/usr/share/gcc-data/i686-pc-linux-gnu/4.6.3/man
--infodir=/usr/share/gcc-data/i686-pc-linux-gnu/4.6.3/info
--with-gxx-include-dir=/usr/lib/gcc/i686-pc-linux-gnu/4.6.3/include/g++-v4
--host=i686-pc-linux-gnu --build=i686-pc-linux-gnu --disable-altivec
--disable-fixed-point --with-ppl --with-cloog --disable-ppl-version-check
--with-cloog-include=/usr/include/cloog-ppl --enable-lto --enable-nls
--without-included-gettext --with-system-zlib --disable-werror
--enable-secureplt --disable-multilib --enable-libmudflap --disable-libssp
--enable-libgomp
--with-python-dir=/share/gcc-data/i686-pc-linux-gnu/4.6.3/python
--enable-checking=release --disable-libgcj --with-arch=i686 --enable-objc-gc
--enable-languages=c,c++,objc,fortran --enable-shared --enable-threads=posix
--enable-__cxa_atexit --enable-clocale=gnu --enable-targets=all
--with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.6.3 p1.3,
pie-0.5.1' --disable-libstdcxx-pch
Thread model: posix
gcc version 4.6.3 (Gentoo 4.6.3 p1.3, pie-0.5.1)
g++-4.6.3 -std=gnu++0x -O3 -fomit-frame-pointer -march=native -c tools.cpp -o
ui-tools.o
(without preprocessor switches, as they won't matter for preprocessed sources)
no warnings with the above line (though quite a few with -Wall, but not in the
affected part of code, it would seem)

The attached preprocessed sources produce *right* code, to get the *wrong*
code, remove 'string test(n);' (which should be a no-op there) from the
'for(unsigned n = 0; n < Codes; n++)' around line 54977.