http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15533
--- Comment #3 from Uros Bizjak <ubizjak at gmail dot com> 2012-01-08 19:55:00 UTC --- We do in fact have comment in i386.md: ;; Logical inclusive and exclusive OR instructions ;; %%% This used to optimize known byte-wide and operations to memory. ;; If this is considered useful, it should be done with splitters.
