INT64 __fastcall RtlpGetNonLegacyXStateAreaLength(INT64 a1){
if( (KUSER_SHARED_DATA.XState.ControlFlags & 2) != 0 )
a1 &= KUSER_SHARED_DATA.XState.EnabledFeatures | KUSER_SHARED_DATA.XState.EnabledUserVisibleSupervisorFeatures | 0x8000000000000000ui64;
return(unsigned int)RtlpGetEntireXStateAreaLength(a1) - 512;
}