bit operations on 128bit register for ADSP 201s

deal all,

I need to do some bit operations on DCx register on ADSP201s. The
register is a quad-word, 128bit,

I checked their programming manual, the bit operation cmd,such BSET,
BCLR only works for 32 bit register.

I dont want to decompose the 128bit register into 32 bit int varible,
does anybody have such experience to bit operation directly on these
128bit registers,such as BSET or BCLR operations?

thanks for your any suggestions.

c.