Alex BradburyI wrote a little blog post on storing data in pointers - initially motivated by documenting the impact of >48-bit virtual addresses on such tricks and the various available hardware pointer masking schemes https://muxup.com/2023q4/storing-data-in-pointers Any corrections or additional notes, do let me know!
Job@asb Nice explanation and overview of examples! Thank you for sharing.
Since you asked for more examples: Øyvind Kolås has experimented with using the least significant bit trick for string interning of ultra-short strings in the pointer to the string itself. He describes his findings here: https://squoze.org/