http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54969
--- Comment #3 from Ralph Loader <suckfish at ihug dot co.nz> 2012-10-18 09:56:36 UTC --- Re copy-header: adding -ftree-ch to the command line does not improve the code. Replacing the bitwise test 'f & 1' with a numeric test 'f < 27', gcc -Os optimises properly.
