I liked UTF-8 more before I started to think hard about efficient RISC-V BitManip code for encoding/decoding it.
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People writing fast UTF-8 decoders are crying over Zen 2 having slow PEXT, to give some idea how esoteric that gets.
I have no problem with PEXT (called BEXT in RISC-V BitManip). Here are my encoder and decoder for LEB128 as used in the DWARF debug file format (without returning symbol length, bc that's trivial). But I have a really hard time coming up with reasonable branchless code for UTF-8.pic.twitter.com/oVxKYeye95
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This was the discussion: https://news.ycombinator.com/item?id=15425658 … (also see the original article).
Thanks. Twitter will use this to make your timeline better. UndoUndo
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