Comment by astrange
5 hours ago
Oh yeah, maybe that one was too obscure for me. I don't think I've ever seen something use PF/AF…
You do want FEAT_AFP though, so you do want ARMv8.6+.
5 hours ago
Oh yeah, maybe that one was too obscure for me. I don't think I've ever seen something use PF/AF…
You do want FEAT_AFP though, so you do want ARMv8.6+.
SETP is used rarely to compute parity, though it doesn't really save anything if you can use POPCNT. PF is also used by floating point comparisons with a different meaning though that is not useful for the Arm extension from Apple.
AF indeed is basically unused. The problem for both is that you need them for accurate emulation "just in case".