ssi_excl_shared_bits
scr = ssi_excl_shared_bits(vals->scr, avals->scr, aactive);
sier = ssi_excl_shared_bits(vals->sier, avals->sier, aactive);
srcr = ssi_excl_shared_bits(vals->srcr, avals->srcr, aactive);
stcr = ssi_excl_shared_bits(vals->stcr, avals->stcr, aactive);