[PATCH 0/1] RISC-V: Add `OP_V' to .insn named opcodes

[Kito Cheng]

Hi Tsukasa:

Could you add your sample.s as testcase?

Thanks

On Thu, Jul 28, 2022 at 7:46 PM Tsukasa OI <research_trasio@irq.a4lg.com>
wrote:

> Ping.
>
> I noticed that LLVM (14 or later) already implements this named opcode.
>
> sample.s:
>     .attribute arch, "rv64gcv"
>     # Both vadd.vv v1,v2,v3
>     .insn r 0x57, 0, 1, x1, x3, x2
>     .insn r OP_V, 0, 1, x1, x3, x2
>
> $ llvm-mc -filetype=obj -triple=riscv64 -o sample.o sample.s
> $ riscv64-unknown-elf-objdump -d sample.o
> (...)
> 0000000000000000 <.text>:
>    0:   022180d7                vadd.vv v1,v2,v3
>    4:   022180d7                vadd.vv v1,v2,v3
>
> Even after this patch, following assembly file generates an error
> (unlike LLVM).  I'm going to raise an issue later.
>
> sample2.s:
>     .attribute arch, "rv64gcv"
>     # vadd.vv v1,v2,v3 (okay on LLVM but error on Binutils)
>     .insn r OP_V, 0, 1, v1, v3, v2
>
> Thanks,
> Tsukasa
>
>
> On 2022/07/09 12:51, Tsukasa OI wrote:
> > Hello,
> >
> > This small patch adds OP_V to named opcode list for .insn directive.
> >
> > Tracker on GitHub:
> > <https://github.com/a4lg/binutils-gdb/wiki/riscv_gas_insn_opv>
> >
> >     Sidenote:
> >     I started listing my Binutils submissions on my GitHub Wiki:
> >     <https://github.com/a4lg/binutils-gdb/wiki/Patch-Queue>
> >     hoping that current status and conflicting patches are clear.
> >
> >
> > OP-V (0x57) is an opcode for vector instructions (defined on now
> > ratified V extension).  It adds OP_V to named constants of .insn
> directive
> > (note that replacing - with _ is standard on GNU Binutils' .insn).
> >
> > Although vector instruction encoding is not implemented in .insn
> directive,
> > it will help future implementation of custom vector .insn.
> >
> > If Zp* extensions are ratified, we could add OP_P (0x77) likewise.
> >
> >
> > Thanks,
> > Tsukasa
> >
> >
> >
> >
> > Tsukasa OI (1):
> >   RISC-V: Add `OP_V' to .insn named opcodes
> >
> >  gas/config/tc-riscv.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> >
> > base-commit: d2acd4b0c5bab349aaa152d60268bc144634a844
>