This is the revised version of my patch #8 for power8 support.  I have removed
all of the incidental changes, and only added the support for load fusion.  I
have added support for fusion on 32-bit Linux.  I have added a test to make
sure the fusion ops are being generated.

I have built a compiler on power7 with the bootstrap options to use
-mcpu=power7 -mtune=power8 (which turns on power8 fusion), and it bootstraps
with the change.  There are no make check regressions with this patch.

I also have done a full 64-bit spec 2006 run comparing my normal power7
configuration to a configuration that enables power8 fusion.  There were no
significant differences in any of the 29 benchmarks.

As I mentioned before a better solution is to rework the secondary reload
interface, so that we recognize more general addresses before reload, and keep
fusion addresses after reload.  I have started work on doing this, but I expect
it will be some time before I get the code so that it is stable, and perhaps a
longer period of time before it is acceptable for release, and corner case bugs
fixed.  So, I would like to install this temporary patch to enable load fusion
while I'm working on the final solution.  Is this patch ok to install?

I should note that while fusion will be enabled for AIX and for 64-bit small
code model with this patch, I don't expect you would see as many fusion
opportunities as you would under 32-bit Linux and 64-bit Linux for medium/large
code models, due to the fact that the TOC address is not a fusion opportunity.

-- 
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460, USA
email: meissner@linux.vnet.ibm.com, phone: +1 (978) 899-4797