Op_spr
{ "mfspr", 0xfc0007fe, 0x7c0002a6, Op_D | Op_spr },
{ "mtspr", 0xfc0007fe, 0x7c0003a6, Op_S | Op_spr },
Op_dcr = Op_spr, /* out of bits - cheat with Op_spr */
if (func & Op_spr) {
func &= ~Op_spr;