add alpha 128-bit ieee support routines

[Måns Rullgård]

Richard Henderson <rth@twiddle.net> writes:

> Committed.

So someone is actually doing work on the Alpha stuff.  Then maybe you
can tell me how to build this thing on an Alpha machine.  If I enable
TLS it won't link, telling me something about "TLS local exec code
cannot be linked into shared objects".  So I disabled TLS and enabled
linuxthreads instead of nptl.  Then the build completed, but "make
check" reported some failures in some math code (atan2 returning the
wrong value) and lots of errors about pthread_setcanceltype returning
invalid values.  I'd really like to get this working.

-- 
Måns Rullgård
mru@kth.se