http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55882
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> 2013-01-08 15:54:46 UTC --- Or more correct Index: gcc/emit-rtl.c =================================================================== --- gcc/emit-rtl.c (revision 195014) +++ gcc/emit-rtl.c (working copy) @@ -1839,7 +1839,12 @@ set_mem_attributes_minus_bitpos (rtx ref if (!align_computed) { - unsigned int obj_align = get_object_alignment (t); + unsigned int obj_align; + unsigned HOST_WIDE_INT obj_bitpos; + get_object_alignment_1 (t, &obj_align, &obj_bitpos); + obj_bitpos = (obj_bitpos + apply_bitpos) & (obj_align - 1); + if (obj_bitpos != 0) + obj_align = (obj_bitpos & -obj_bitpos); attrs.align = MAX (attrs.align, obj_align); } }