The tester recently started failing va-arg-22.c on microblaze-linux:

gcc.c-torture/execute/va-arg-22.c   -O0  (test for excess errors)

It was failing with an undefined reference to "r7" at link time.  This 
was ultimately tracked down to a HImode load using (reg+reg) addressing 
mode, but which used the lhui instruction instead of lhu.  The "i" means 
it's supposed to be (reg+disp) so the assembler tried to interpret "r7" 
as an immediate/symbol.

The port uses %i<opnum> as an output modifier to select between sh/shi 
and various other mnemonics for loads/stores.  The movhi pattern simply 
failed to use it for the two cases where it's loading from memory 
(interestingly enough it was used for stores).

Clearly we aren't using reg+reg much for HImode loads as this didn't fix 
anything else in the testsuite.

Installing on the trunk,
Jeff