Bug 953

Summary:	SVP64 assembly cookbook
Product:	Libre-SOC Website	Reporter:	Konstantinos Margaritis (markos) <konstantinos>
Component:	website	Assignee:	Luke Kenneth Casson Leighton <lkcl>
Status:	CONFIRMED ---
Severity:	enhancement	CC:	andy.miroshnikov, libre-soc-bugs, toshaan
Priority:	---
Version:	unspecified
Hardware:	PC
OS:	Linux
URL:	https://libre-soc.org/openpower/sv/cookbook/
See Also:	https://bugs.libre-soc.org/show_bug.cgi?id=1019 https://bugs.libre-soc.org/show_bug.cgi?id=1006 https://bugs.libre-soc.org/show_bug.cgi?id=1124 https://bugs.libre-soc.org/show_bug.cgi?id=1186
NLnet milestone:	NLnet.2022-08-051.OPF	total budget (EUR) for completion of task and all subtasks:	10000
budget (EUR) for this task, excluding subtasks' budget:	0	parent task for budget allocation:	952
child tasks for budget allocation:	659 672 676 701 1117	The table of payments (in EUR) for this task; TOML format:
Bug Depends on:	659, 897, 1050, 1078, 1085, 672, 676, 701
Bug Blocks:	952

Description Konstantinos Margaritis (markos) 2022-10-14 15:37:51 BST

Following the recently completed tasks of VP8/VP9/AV1 implementations and other projects, it became apparent that it would be nice to have some sort of SVP64 assembly cookbook, where we would present a common algorithm in C and best practices converting it to SVP64 assembler. It will be very important both in showcasing the capabilities and features of SVP64 and also helping developers would would like to port their software to the new architecture -even before it's available.

high priorities:

* bug #1085  parallel prefix sum polynomials
* bug #1117 daxpy https://libre-soc.org/simple_v_extension/daxpy_example/
* bug #701   Matrix REMAP

ideas:

* bug #1006  xchacha20 - more an "app note" than a cookbook but good stuff
* bug #676   Fortran MAXLOC
* bug #659   register-based insertion sort
* bug #1050  register-based bitonic sort
* bug #1078  register-based counting sort
* bug #TODO  FFT and DCT REMAP
* bug #672   positional popcount
* strncpy although this is already implemented it needs documenting
  - https://git.libre-soc.org/?p=openpower-isa.git;a=blob;f=src/openpower/decoder/isa/test_caller_svp64_ldst.py;h=647e793#l32
  - https://github.com/riscv/riscv-v-spec/blob/master/example/strncpy.s
  - https://twitter.com/lkcl/status/1641919390588325888
* bug #TODO  Horizontal Sum
* bug #TODO  dot product (see bug #142 and bug #555)
* bug #TODO  cross product
* bug #TODO  VSX vexpandqm as zeroing predicate-mask sv.addi -1
* bug #TODO  VSX vextractwm/dm using sv.cmpi followed by crweird
* bug #TODO  VSX xxblendvh/w/b/d using... sv.mv.swizzle? pack/unpack with vec2?
* bug #TODO  VSX xxgenpcvdm looks fun!
* bug #TODO  sign-extending packed regs: sv.exts* and other tricks
* bug #TODO  conflictd
  - https://libre-soc.org/openpower/sv/vector_ops/discussion/

Comment 1 Luke Kenneth Casson Leighton 2023-03-08 19:48:23 GMT

Author: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date:   Wed Mar 8 19:47:33 2023 +0000

    add svp64 cookbook recipe root

https://git.libre-soc.org/?p=libreriscv.git;a=commitdiff;h=ad71d796fe9e1f77c366b1941ae7275760ef668f

Comment 2 Luke Kenneth Casson Leighton 2023-03-15 17:15:48 GMT

we had the really good idea of meeting every couple of weeks to discuss
one of these ideas as a group.  open invitation.

Comment 3 Luke Kenneth Casson Leighton 2023-04-25 21:08:25 BST

idea: presentation of the cookbook ideas to be done under bug #1019

Comment 4 Toshaan Bharvani 2023-04-27 08:31:37 BST

Lets pick a timing for those meetings
- bi weekly
- 1 hour

Comment 5 Luke Kenneth Casson Leighton 2023-04-27 12:29:30 BST

(In reply to Toshaan Bharvani from comment #4)
> Lets pick a timing for those meetings
> - bi weekly
> - 1 hour

i'm happy they're in the existing tuesday.