[Bug c++/41847] New: warning: array subscript is above array bounds

["caolanm at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>]

#  gcc -Wall -O2 -c demo.cxx
demo.cxx: In function ?void isInvertible()?:
demo.cxx:12: warning: array subscript is above array bounds

gcc --version
gcc (GCC) 4.4.2 20091019 (Red Hat 4.4.2-5)

I've the same results with...
gcc (GCC) 4.4.2 20091019 (Red Hat 4.4.2-5) (gcc-4.4.2-5.el6.s390x)
gcc (GCC) 4.4.1 20090725 (Red Hat 4.4.1-3) (gcc-4.4.1-3.s390x)
gcc (GCC) 4.4.0 20090506 (Red Hat 4.4.0-4) (gcc-4.4.0-4.s390x)

Possibly a duplicate of #35392
so its not a very recent thing.

I only get this warning (and related runtime failure) with s390x. Equivalent
x86_64/x86/ppc/ppc64/arm gcc's appear fine


-- 
           Summary: warning: array subscript is above array bounds
           Product: gcc
           Version: 4.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: caolanm at redhat dot com
 GCC build triplet: s390x-ibm-linux
  GCC host triplet: s390x-ibm-linux
GCC target triplet: s390x-ibm-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41847