[PATCH v6 1/2] RISC-V: Add SpacemiT vendor extension xsmtvdot

[Mark Wielaard]

Hi,

On Mon, Jun 22, 2026 at 04:48:35PM +0000, Jeffrey Law via Binutils wrote:
> On 5/25/2026 2:20 AM, Mark Zhuang wrote:
> > From: Mark Zhuang <mark.zhuang@spacemit.com>
> >
> > SpacemiT defines Intrinsic Matrix Extension (IME) specification [1].
> > SpacemiT X60 implements version 1.0 of the SpacemiT Vector Dot Product
> > Extension (XsmtVdot v1.0) [2], a subset of the full IME specification.
> >
> > [1] https://github.com/spacemit-com/riscv-ime-extension-spec/releases/download/v1.0/spacemit-ime-asciidoc.pdf
> > [2] https://github.com/spacemit-com/docs-ai/blob/main/en/architecture/ime_extension.md
> > ---
> >   bfd/elfxx-riscv.c                         |  7 ++
> >   gas/NEWS                                  |  3 +
> >   gas/config/tc-riscv.c                     | 81 +++++++++++++++++++++++
> >   gas/doc/c-riscv.texi                      |  8 +++
> >   gas/testsuite/gas/riscv/march-help.l      |  1 +
> >   gas/testsuite/gas/riscv/x-smt-vdot-fail.d |  3 +
> >   gas/testsuite/gas/riscv/x-smt-vdot-fail.l | 73 ++++++++++++++++++++
> >   gas/testsuite/gas/riscv/x-smt-vdot-fail.s | 50 ++++++++++++++
> >   gas/testsuite/gas/riscv/x-smt-vdot.d      | 41 ++++++++++++
> >   gas/testsuite/gas/riscv/x-smt-vdot.s      | 33 +++++++++
> >   include/opcode/riscv-opc.h                | 38 +++++++++++
> >   include/opcode/riscv.h                    |  9 +++
> >   opcodes/riscv-dis.c                       | 33 +++++++++
> >   opcodes/riscv-opc.c                       | 23 +++++++
> >   14 files changed, 403 insertions(+)
> >   create mode 100644 gas/testsuite/gas/riscv/x-smt-vdot-fail.d
> >   create mode 100644 gas/testsuite/gas/riscv/x-smt-vdot-fail.l
> >   create mode 100644 gas/testsuite/gas/riscv/x-smt-vdot-fail.s
> >   create mode 100644 gas/testsuite/gas/riscv/x-smt-vdot.d
> >   create mode 100644 gas/testsuite/gas/riscv/x-smt-vdot.s
> THanks.  I've pushed this to the trunk.

This does break the build with older gcc versions (8.5.0):

../../binutils-gdb/opcodes/riscv-dis.c: In function ‘print_insn_args’:
../../binutils-gdb/opcodes/riscv-dis.c:927:9: error: a label can only be part of a statement and a declaration is not a statement
         unsigned vd = EXTRACT_OPERAND (SPACEMIT_IME_VD, l) * 2;
         ^~~~~~~~
../../binutils-gdb/opcodes/riscv-dis.c:932:9: error: a label can only be part of a statement and a declaration is not a statement
         unsigned vs = EXTRACT_OPERAND (SPACEMIT_IME_VS1, l) * 2;
         ^~~~~~~~

It wants a block after a case label when declaring new variables.

See also
https://builder.sourceware.org/buildbot/#/builders/290/builds/6952/steps/4/logs/stdio

Cheers,

Mark