So I was curious what would happen if I turned on LRA for m68k. It turns
out my autoinc patches from the cc0 patch set expose a bug in how LRA
handles autoincrement. While it copies the logic from reload's
inc_for_reload, it appears to be missing the find_reloads_address code
to ensure an autoinc address is reloaded entirely if it is part of a
jump. LRA can reload just the register inside a POST_INC, which leads to
creating an output reload.

Hence, a new version of the autoinc changes, below. Since reload is
known to work, we allow autoinc in jumps unless targetm.lra_p. One part
of the patch is a fix for the earlier combine patch which was already
checked in, the other part is a new version of the auto-inc-dec patch.
Bootstrapped and tested on the gcc135 machine
(powerpc64le-unknown-linux-gnu). OK?


Bernd