Does failing to register as a sex offender constitute a cruel and unusual punishment?

failing to register as sex offender upon does not constitute cruel and unusual punishment in violation of the federal Constitution]; but see In re Rodriguez (1975) 14 Cal.3d 639 [holding sentence was cruel and unusual punishment where defendant had served 22 years for a nonviolent act of child molestation].) "[L]ewd conduct on a child may not be the most grave of all offenses, but its seriousness is considerable. It may have lifelong consequences to the well-being of the child." (People v. Christensen (2014) 229 Cal.App.4th 781, 806.)