[Bug target/15533] Missed move to partial register

[ubizjak at gmail dot com]

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.