[PATCH v3 0/6] target/riscv: Add SiFive Xsfvqmaccdod/Xsfvqmaccqoq int8 matmul extensions

[Max Chou <max.chou@sifive.com>]

This patchset adds SiFive's custom int8 matrix-multiply vector
extensions Xsfvqmaccdod and Xsfvqmaccqoq. Each extension provides 4
signedness variants (unsigned/unsigned, signed/signed,
unsigned/signed, signed/unsigned) for a total of 8 instructions:
sf.vqmacc{u,,us,su}.{4x8x4,2x8x2}.

The toolchains support Xsfvqmaccdod/Xsfvqmaccqoq extensions:
 - LLVM 18.1.0
   - llvm/llvm-project#68295, commit d1985e3d1fed, merged 2023-10-20.
   https://github.com/llvm/llvm-project/pull/68295
 - GCC 15
   - commit 139bd3198a73 ("RISC-V: Add the mini support for SiFive extensions"), 2024-11-17.

References:
 - SiFive Int8 Matrix Multiplication Extensions Specification
   https://www.sifive.com/document-file/sifive-int8-matrix-multiplication-extensions-specification

Changes since v2:<20260812174417.2468981-1-max.chou@sifive.com>
 - Rebase to riscv-to-apply.next branch (commit aee18ec)
 - Modified patch 5 to align the new disas flow

Changes since v1:<20260721122034.1567146-1-max.chou@sifive.com>
 - Rebase to master branch (commit 84f0721)
 - Reformat riscv_multi_ext_implied_rules to list one rule per
   line before adding XSFVQMACCDOD_IMPLIED/XSFVQMACCQOQ_IMPLIED, so
   future additions to the array are a pure append instead of
   reflowing whatever line they land on. Split out into its own
   patch. (Thanks for Daniel Henrique Barboza's suggestion)
 - Move the SiFive int8 matmul helper out of the shared
   vector_helper.c and into a new target/riscv/tcg/xsf_helper.c,
   so vendor-specific code no longer lives in common vector-helper
   code. (Thanks for Daniel Henrique Barboza's suggestion)

rnax

Frank Chang (2):
  target/riscv/cpu: Add SiFive custom int8 matmul extension implied
    rules
  target/riscv: rvv: Add SiFive custom int8 matmul instructions

Jason Chien (1):
  disas/riscv: Add disassembler support for Xsfvqmaccdod/Xsfvqmaccqoq

Max Chou (3):
  target/riscv: Add cfg property for SiFive int8 matmul extensions
  target/riscv/cpu: List one implied-ext rule per line
  tests/tcg/riscv64: Add tests for SiFive int8 matmul extensions

 MAINTAINERS                                 |  10 +
 disas/meson.build                           |   3 +-
 disas/riscv-xsf-op.c.inc                    |  11 +
 disas/riscv-xsf.c                           |  49 ++++
 disas/riscv-xsf.h                           |  16 ++
 disas/riscv.c                               |   2 +
 disas/riscv.h                               |   1 +
 target/riscv/cpu.c                          |  80 ++++--
 target/riscv/cpu_cfg.h                      |   5 +
 target/riscv/cpu_cfg_fields.h.inc           |   2 +
 target/riscv/helper.h                       |  10 +
 target/riscv/meson.build                    |   1 +
 target/riscv/tcg/insn_trans/trans_xsf.c.inc |  98 ++++++++
 target/riscv/tcg/meson.build                |   1 +
 target/riscv/tcg/tcg-cpu.c                  |  16 ++
 target/riscv/tcg/translate.c                |   3 +
 target/riscv/tcg/xsf_helper.c               |  87 +++++++
 target/riscv/xsf.decode                     |  30 +++
 tests/tcg/riscv64/Makefile.softmmu-target   |   7 +
 tests/tcg/riscv64/test-xsfvqmacc.S          | 260 ++++++++++++++++++++
 20 files changed, 677 insertions(+), 15 deletions(-)
 create mode 100644 disas/riscv-xsf-op.c.inc
 create mode 100644 disas/riscv-xsf.c
 create mode 100644 disas/riscv-xsf.h
 create mode 100644 target/riscv/tcg/insn_trans/trans_xsf.c.inc
 create mode 100644 target/riscv/tcg/xsf_helper.c
 create mode 100644 target/riscv/xsf.decode
 create mode 100644 tests/tcg/riscv64/test-xsfvqmacc.S

-- 
2.43.0