[Bug target/52941] SH Target: Add support for movco.l / movli.l atomics on SH4A

[kkojima at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52941

--- Comment #3 from Kazumoto Kojima <kkojima at gcc dot gnu.org> 2012-04-13 03:29:25 UTC ---
(In reply to comment #2)
> One more thing regarding movco/movli ... do you think it's OK to use them also
> to do atomics on types < SImode?  As far as I can see it should be safe to do
> e.g. read SImode, modify QImode subreg, write-back SImode.

Yes, it'll make false-positive cases but would be safe.