[PATCH RFC] hppa: assemble_16() in wide mode

[Sven Schnelle]

Hi Richard,

while looking into a HPPA tcg issue i noticed that the current
tcg code doesn't do the special wide mode handling described in the
Parisc 2.0 specification, Chapter E -> assemble_16(). In wide mode,
assemble_16() adds two more bits to the immediate value/displacement
of certain instruction like ldo(ldi), st[bhwd] and ld[bhwd] and some
others.

I wonder what the easiest way to implement this is - it has to be xor'd
and is dependend on the W bit, so i don't think it will be possible to
implement this with changing only insn.decode. I came up with the
attached patch, do you think there's a better way?

Thanks!
Sven