register usage

["Petar Bajic" <petar.bajic@xxxxxxxxxxxxxxx>]

I want to forbid compiler to use condition register for destination in movz 
instruction
instruction (if r3 == 0, move r2 to r1) should look like this:
movz r1, r2, r3  (r3 condition, r2 source, r1 destination register)
but compiler generates this
movz r3, r2, r3
and uses r3 further on. Wich is techincally ok, but I have this problem with 
overwritting condition and would like to save it.
How do I tell compiler to generate different register for destination?

Petar