GEN8_MCR_SUBSLICE
mcr_ss = GEN8_MCR_SLICE(group) | GEN8_MCR_SUBSLICE(instance);
#define GEN8_MCR_SUBSLICE_MASK GEN8_MCR_SUBSLICE(3)
mcr = GEN8_MCR_SLICE(slice) | GEN8_MCR_SUBSLICE(subslice);