I was asked for an update on the status of mspgcc support for 20-bit,
so to keep everybody in the loop:

Yes, it's still me, and I still plan to get to it, but after spending
two months on mspgcc full time on my nickel, I've chosen to get a day
job again, so I only have a few hours to spend on it each week.  Don't
look for anything 20-bit-ish before mid summer at the earliest.

I personally think the uniarch system is pretty stable. I'm still
tracking down anomalies, but almost all of them have been present for
years; see the SF bug trackers.  Before adding new features, I want
the test infrastructure required to verify that what's already there
is working.  The refactoring that comes with fixing the problems I
find will also make it easier to add 20-bit support.

At the moment, I have a rework of the logical/arithmetic shift code in
progress, which will include support for the multi-bit shift
instructions of CPUX.  After that, the priority is to get the
revitalized uniarch out as a gcc 4.5.3-based stable system for
downstream packagers, but that won't include 20-bit support.  I'd like
that available by early June.  There's still a fair amount of back end
rework required to add new core types required for 20-bit addresses,
and I want to get people migrated to the version that supports the
newer chips (and is more maintainable).  Then I can leave that one as
bug-fix only while doing the evolution to 20-bit in the 4.6.x series.

I don't have any plans to make new releases in the mspgcc4 series.  If
you have a showstopper bug please report it on the SF mspgcc4 bug
tracker, and note that it's a showstopper and explain why you can't
move to uniarch.  If I can, I'll at least create a patch, but the
mspgcc4 build approach is not suited for patching things, so there'll
probably be some work on your end.

Peter

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