[Bug target/53911] [SH] Improve displacement addressing

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53911

--- Comment #4 from Oleg Endo <olegendo at gcc dot gnu.org> ---
There is a GSoC 2015 project which will try to address the AMS problem.
https://www.google-melange.com/gsoc/project/details/google/gsoc2015/erikvarga/5693417237512192

It will be initially for SH.  If it works out, it can be generalized so that
other targets can benefit from it, too.