Besides ARM in the sibling replies, Solaris on SPARC has been using ADI for a decade, iOS has PAC, CHERI is being worked on as Microsoft/ARM collaboration, and then there is ARM MTE on Azure Sphere as well.
Because we have come to the realisation that only "C Machines" can fix this issue, as even if Safe C would come tomorrow, the existing software wouldn't be rewritten anyway.
https://docs.oracle.com/cd/E53394_01/html/E54815/gqajs.html
https://developer.apple.com/documentation/security/preparing...
https://msrc.microsoft.com/blog/2022/01/an_armful_of_cheris/
Because we have come to the realisation that only "C Machines" can fix this issue, as even if Safe C would come tomorrow, the existing software wouldn't be rewritten anyway.