[Libre-soc-isa] [Bug 213] SimpleV Standard writeup needed

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Mon Oct 5 21:54:13 BST 2020


--- Comment #8 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
a practical analysis of the OpenPOWER ISA, in order to work out the prefixes,
should begin by identifying the format of opcodes.  analysing the full ISA in
its "Forms" is impractical, however in the microcode format defined by
microwatt it is much easier.

i therefore asked cole to collate the CSV files, strip the opcode function unit
comment and sgl fields and to sort and uniquify the results, then
cross-reference those against the original CSV files to identify the "types" of

how many 2-operand instructions, how many 3-operand etc.

a crucial thing we will have to decide is what to do about CRs.  VSX
auto-collates into CR7 which i am not keen on.

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