http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50751
--- Comment #1 from Kazumoto Kojima <kkojima at gcc dot gnu.org> 2011-10-17 00:29:55 UTC --- This is a known issue. See the comment just before sh.c:sh_legitimate_index_p. Unfortunately, I guess this PR might be marked as WONTFIX.