SIBA_CC_PMUCTL_XF
pmu &= ~(SIBA_CC_PMUCTL_ILP | SIBA_CC_PMUCTL_XF);
pmu |= ((uint32_t)e->xf << 2) & SIBA_CC_PMUCTL_XF;
if (((pmu & SIBA_CC_PMUCTL_XF) >> 2) == e->xf)
pmu &= ~SIBA_CC_PMUCTL_XF;
pmu |= ((uint32_t)e->xf << 2) & SIBA_CC_PMUCTL_XF;