regression for 3.1: bad sign extension?

[Geoff Keating]

Bob Wilson <bwilson@tensilica.com> writes:

> The problem occurs when there is an unsigned short (16-bits, HI mode)
> that gets (incorrectly?) sign-extended by this code.

There's no such thing as an 'unsigned short' in RTL.  All HImode
values are the same, and there is only one way to write a HImode constant
of 0xffff: (const_int -1).

-- 
- Geoffrey Keating <geoffk@geoffk.org> <geoffk@redhat.com>