[libre-riscv-dev] uniform instruction format

[Luke Kenneth Casson Leighton]

jacob, you missed some questions, which are important to resolve.  going
through the pseudo-code, and also through the RV spec, the format of
RV48-I-type seems wrong.  the pseudo-code says that it should match exactly
with RV32-I-Type, which it does not.

also can you clarify if the other potential error that i spotted is or is
not correct?

l.

+---------------+-------------+-------+----------+----------+--------+----------+--------+
| Encoding      | 47:43       | 42:41 | 40:36    | 35:31    | 30:28  |
27:23    | 22:18  |
+---------------+-------------+-------+----------+----------+--------+----------+--------+
| RV32 Encoding | 31:27       | 26:25 | 24:20    | 19:15    | 14:12  | 11:7
    | 6:2    |
+---------------+-------------+-------+----------+----------+--------+----------+--------+
| P48FI-type    | funct7[6:2] | fmt   | funct5   | rs1[4:0] | rm     |
rd[4:0]  | opcode |
+---------------+-------------+-------+----------+----------+--------+----------+--------+