http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54051
--- Comment #6 from Joey Ye <joey.ye at arm dot com> 2013-02-05 07:48:48 UTC --- (In reply to comment #5) > This issue also impacts ldrexh/ldrexb as assembler doesn't accept ldrexh r1, > [r0, #0]. Better to backport to 4.7. and 4.6