[PATCH] RISC-V: Add experimental support for Zvabd extension

[Zhongyao Chen]

the spec can be found in section "5. Supporting Materials" from this link:
https://riscv.atlassian.net/wiki/spaces/VXXX/pages/166690866/Fast-Track+Proposal+for+integer+vector+absolute+difference+instructions

On Mon, Sep 8, 2025 at 2:22 PM Jan Beulich <jbeulich@suse.com> wrote:
>
> On 08.09.2025 03:09, chen.zhongyao@zte.com.cn wrote:
> > From 621ed351372b8f20c8fade8cab89734f17a9dc72 Mon Sep 17 00:00:00 2001
> > From: Zhongyao Chen <chen.zhongyao@zte.com.cn>
> > Date: Sun, 7 Sep 2025 04:35:51 +0000
> > Subject: [PATCH] RISC-V: Add experimental support for Zvabd extension
> >
> > This patch adds experimental support for the RISC-V Zvabd (Vector Absolute
> > Difference) extension, based on version 0.5 of the proposal.
> >
> > The Zvabd instruction set specification can be found in the fast-track proposal:
> > https://lf-riscv.atlassian.net/wiki/spaces/VXXX/pages/166690866/Fast-Track+Proposal+for+integer+vector+absolute+difference+instructions
>
> See https://sourceware.org/pipermail/binutils/2025-August/143522.html for
> an earlier submission. Sadly, like for the other submission, the link here
> doesn't actually point at a (complete) spec of the extension.
>
> Jan