On: The risk of RISC-V: What's going on at SiFive?

[Symmetry]

Once you're moving to alignment within a larger fixed width block you don't even need to stick to byte boundaries. I've got a toy ISA I've played around with that breaks 64 bit chunks into a 62 bit instruction, a 40 and a 21 bit instruction, or 3 21 bit instructions.

[leosarev → Symmetry]

I think Itanium did something like that

[Symmetry → leosarev]

Yup, 128 bit bundles with 3 instructions each, and ways to indicate that different bundles could execute in parallel.