linux-kernel - Re: [PATCH] LoongArch: Improve memory ops

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Date:   Mon, 10 Apr 2023 22:19:47 +0800
From:   Rui Wang <wangrui@...ngson.cn>
To:     Xi Ruoyao <xry111@...111.site>
Cc:     Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH] LoongArch: Improve memory ops

On Mon, Apr 10, 2023 at 8:20 PM Xi Ruoyao <xry111@...111.site> wrote:
>
> On Mon, 2023-04-10 at 19:57 +0800, WANG rui wrote:
> > +       /* align up address */
> > +       andi    t1, a0, 7
> > +       sub.d   a0, a0, t1
>
> bstrins.d a0, zero, 2, 0
>
> Likewise for other aligning operations if the temporary is not used.

I think we're on the same page. I had previously tested this on the
user-space version[1], but it's not a performance-critical area.

[1] https://github.com/heiher/mem-bench/blob/0083d4e5a82e57939517413da3bcad81e01adbea/memset-int.S#L35-L37

Regards,
Rui