RtlXRestore

VOID __stdcall RtlXRestore(XSAVE_AREA *Buffer, UINT64 Mask){
  unsigned int MxCsr; 
  if( (Buffer->Header.CompactionMask & 0x8000000000000000ui64) == 0i64 && (Mask & 6) == 4 )
  {
    MxCsr = Buffer->LegacyState.MxCsr;
    Buffer->LegacyState.MxCsr = _mm_getcsr();
    _xrstor(Buffer, Mask);
    Buffer->LegacyState.MxCsr = MxCsr;
  }
  else
  {
    _xrstor(Buffer, Mask);
  }
}

Referenced by:

KeRestoreExtendedAndSupervisorState
KeSaveExtendedAndSupervisorState
KiParkUmsThread
KiRestoreProcessorState
RtlXRestoreS