[libre-riscv-dev] uniform instruction format

[Luke Kenneth Casson Leighton]

Btw Jacob, I realise that the VLIW-like format could hypothetically allow
that new format by Clifford to be incorporated: however the same reasons
why not still apply: it's a new format that would be 18 months to reach the
RV Spec.

In addition, the "variable" format has had a number of bits added that take
away critically important space for our use, when compared to the format
described in the RV Std, section 1.5

Using Clifford's format would therefore have the side effect of extending
the length of every VLIW-like group by around 16 bits.

This being a less desirable outcome, we skip it.

L.



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