http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54170
--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-08-04 11:35:34 UTC --- Indeed, I suspected that immediately. But without a self contained testcase not requiring inspection of the assembly personally I'm not 100% sure (and I'm in the middle of 2-3 other things).
