linux-kernel - Re: [PATCH] riscv, bpf: Introduce shift add helper with Zba optimization

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Date: Tue, 21 May 2024 18:39:56 +0200
From: Björn Töpel <bjorn@...nel.org>
To: Xiao Wang <xiao.w.wang@...el.com>, paul.walmsley@...ive.com,
 palmer@...belt.com, aou@...s.berkeley.edu, luke.r.nels@...il.com,
 xi.wang@...il.com
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
 martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
 yonghong.song@...ux.dev, john.fastabend@...il.com, kpsingh@...nel.org,
 sdf@...gle.com, haoluo@...gle.com, jolsa@...nel.org,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
 bpf@...r.kernel.org, pulehui@...wei.com, haicheng.li@...el.com, Xiao Wang
 <xiao.w.wang@...el.com>
Subject: Re: [PATCH] riscv, bpf: Introduce shift add helper with Zba
 optimization

Xiao Wang <xiao.w.wang@...el.com> writes:

> Zba extension is very useful for generating addresses that index into array
> of basic data types. This patch introduces sh2add and sh3add helpers for
> RV32 and RV64 respectively, to accelerate pointer array addressing.
>
> Signed-off-by: Xiao Wang <xiao.w.wang@...el.com>

This is dependent on [1], and given it hasn't been accepted yet, I'd
make this patch part of that series.


Björn

[1] https://lore.kernel.org/linux-riscv/20240516090430.493122-1-xiao.w.wang@intel.com/