xstate_init_xcomp_bv
xstate_init_xcomp_bv(&fpstate->regs.xsave, fpstate->xfeatures);
xstate_init_xcomp_bv(&newfps->regs.xsave, newfps->xfeatures);
xstate_init_xcomp_bv(&init_fpstate.regs.xsave, init_fpstate.xfeatures);