Reply to post: Re: "I did not know that ARM actually prohibited adding instructions"

Talk about a calculated RISC: If you think you can do a better job than Arm at designing CPUs, now's your chance

Bruce Hoult

Re: "I did not know that ARM actually prohibited adding instructions"

Until now ARM absolutely did forbid licensees from altering the ISA in any way whatsoever. I believe the tagged pointer instructions were indeed added at the request of Apple, but you’ll find them documented in the ARMv8.4-A (I think) manual for all ARM licensees to use. ARM themselves haven’t shipped any CPUs implementing them, but then they also haven’t yet shipped any cores implementing SVE and that was announced and documented three years ago.

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