http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50251
--- Comment #11 from vries at gcc dot gnu.org 2011-09-02 09:37:42 UTC --- The problems for testcases 20010209-1.c and stack-stave-restore.c can be reproduced on x86_64 using -mpreferred-stack-boundary=12.