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Re: [PATCH 00/17] Introduce and use generic parity32/64 helper

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To: Jeremy Kerr <jk@xxxxxxxxxx>
Subject: Re: [PATCH 00/17] Introduce and use generic parity32/64 helper
From: Yu-Chun Lin <eleanor15x@xxxxxxxxx>
Date: Mon, 24 Feb 2025 23:35:48 +0800
Cc: Kuan-Wei Chiu <visitorckw@xxxxxxxxx>, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, joel@xxxxxxxxx, eajames@xxxxxxxxxxxxx, andrzej.hajda@xxxxxxxxx, neil.armstrong@xxxxxxxxxx, rfoss@xxxxxxxxxx, maarten.lankhorst@xxxxxxxxxxxxxxx, mripard@xxxxxxxxxx, tzimmermann@xxxxxxx, airlied@xxxxxxxxx, simona@xxxxxxxx, dmitry.torokhov@xxxxxxxxx, mchehab@xxxxxxxxxx, awalls@xxxxxxxxxxxxxxxx, hverkuil@xxxxxxxxx, miquel.raynal@xxxxxxxxxxx, richard@xxxxxx, vigneshr@xxxxxx, louis.peens@xxxxxxxxxxxx, andrew+netdev@xxxxxxx, davem@xxxxxxxxxxxxx, edumazet@xxxxxxxxxx, pabeni@xxxxxxxxxx, parthiban.veerasooran@xxxxxxxxxxxxx, arend.vanspriel@xxxxxxxxxxxx, johannes@xxxxxxxxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, jirislaby@xxxxxxxxxx, yury.norov@xxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, hpa@xxxxxxxxx, alistair@xxxxxxxxxxxx, linux@xxxxxxxxxxxxxxxxxx, Laurent.pinchart@xxxxxxxxxxxxxxxx, jonas@xxxxxxxxx, jernej.skrabec@xxxxxxxxx, kuba@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-fsi@xxxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-input@xxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, linux-mtd@xxxxxxxxxxxxxxxxxxx, oss-drivers@xxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, linux-wireless@xxxxxxxxxxxxxxx, brcm80211@xxxxxxxxxxxxxxx, brcm80211-dev-list.pdl@xxxxxxxxxxxx, linux-serial@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx, jserv@xxxxxxxxxxxxxxxx
In-reply-to: <1cebfebb9c205a1ebc5722ca7e3b87339ceb3c79.camel@ozlabs.org>
References: <20250223164217.2139331-1-visitorckw@gmail.com> <1cebfebb9c205a1ebc5722ca7e3b87339ceb3c79.camel@ozlabs.org>

On Mon, Feb 24, 2025 at 03:58:49PM +0800, Jeremy Kerr wrote:
> More so than __builtin_parity() ?
> 
> I'm all for reducing the duplication, but the compiler may well have a
> better parity approach than the xor-folding implementation here. Looks
> like we can get this to two instructions on powerpc64, for example.

Hi Jeremy,

Thank for your input. We will do that in V2.

Best regards,
Yu-Chun Lin

References:
- [PATCH 00/17] Introduce and use generic parity32/64 helper
  - From: Kuan-Wei Chiu
- Re: [PATCH 00/17] Introduce and use generic parity32/64 helper
  - From: Jeremy Kerr

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