Someone needs to implement compare-exchange on ARM, which likely needs to map to LL/SC:
<https://www.liblfds.org/mediawiki/index.php?title=Article:CAS_and_LL/SC_Implementation_Details_by_Processor_family>
- TCC on ARM(el) backend problem yeti
- TCC on ARM(el) backend problem Araq
- TCC on ARM(el) backend problem yeti
- TCC on ARM(el) backend problem Araq
- TCC on ARM(el) backend problem awr1
- TCC on ARM(el) backend problem awr1
- TCC on ARM(el) backend problem Araq
- TCC on ARM(el) backend problem cblake
- TCC on ARM(el) backend problem Calonger
- TCC on ARM(el) backend problem mratsim
