Bug 1054 - questions and feedback (v2) on OPF RFC ls012
Summary: questions and feedback (v2) on OPF RFC ls012
Alias: None
Product: Libre-SOC's first SoC
Classification: Unclassified
Component: Specification (show other bugs)
Version: unspecified
Hardware: PC Linux
: --- enhancement
Assignee: Dmitry Selyutin
URL: https://libre-soc.org/openpower/sv/rf...
Depends on: 1099 1052 1055
  Show dependency treegraph
Reported: 2023-04-11 18:20 BST by Luke Kenneth Casson Leighton
Modified: 2024-02-04 03:55 GMT (History)
2 users (show)

See Also:
NLnet milestone: NLnet.2022-08-051.OPF
total budget (EUR) for completion of task and all subtasks: 2500
budget (EUR) for this task, excluding subtasks' budget: 2500
parent task for budget allocation: 1012
child tasks for budget allocation:
The table of payments (in EUR) for this task; TOML format:
lkcl=1000 red={amount=1000,submitted=2023-10-17,paid=2023-11-10} ghostmansd={amount=500,submitted=2024-01-18,paid=2024-01-29}


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Description Luke Kenneth Casson Leighton 2023-04-11 18:20:25 BST
this bugreport tracks questions comments and feedback for v2 of ls012.
included is revisions of LD/ST-shifted, LD/ST-shifyed-Postincrement, and a few
other useful status columns (such as whether the instruction
has binutils support yet).



* DONE - add LD/ST-shifted table from ls004
* DONE - add a binutils column with whether added support or not
Comment 1 Luke Kenneth Casson Leighton 2023-04-12 13:30:52 BST

added LD/ST-Indexed-Shifted table to optable.csv, and add description
into group of instructions. whether a decision is made to include them
or not is entirely up to the ISA WG.
Comment 2 Luke Kenneth Casson Leighton 2023-04-13 11:15:22 BST
i've also added LDST-Shifted-Postinc (!) which is another 37
instructions (!) very deliberately to raise awareness of the
problem of opcode allocation, but also to solicit, under
"Due Diligence", a response from the ISA WG as to why they
should or should not be included.

i would expect the answer "eek!" but then that helps make
te case for shift-and-add as a much more palatable alternative.
Comment 3 Luke Kenneth Casson Leighton 2023-04-26 14:37:37 BST
added a new column "binutils"

indicates if the instruction has been added and/or needs updating.
Comment 4 Dmitry Selyutin 2023-04-26 15:54:51 BST
Thank you for this table! I think with a small tuning I can re-use it to filter it for binutils.
Comment 5 Luke Kenneth Casson Leighton 2023-10-17 13:31:34 BST
this is a "summary" RFC and has served (still serves) an incredibly valuable
purpose well beyond its original intention: providing *project* wide summaries
and tables sorted by different criteria.