http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54342
--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> 2012-08-23 04:04:36 UTC --- I don't think AVX supports true 256-bit integer. On the other hand, I was also puzzled by compute_record_mode, which excludes UNION_TYPE and QUAL_UNION_TYPE. Will including them break union?
