linux-kernel - Re: [PATCH v2 09/76] ARC: Checksum/byteorder/swab routines

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Message-ID: <50F95B84.2010802@synopsys.com>
Date:	Fri, 18 Jan 2013 19:56:12 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	<linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 09/76] ARC: Checksum/byteorder/swab routines

On Friday 18 January 2013 07:51 PM, Arnd Bergmann wrote:
> On Friday 18 January 2013, Vineet Gupta wrote:
>> TBD: do_csum still needs to be written in asm
> Do you actually expect a lot of improvement in do_csum?
> I would hope that gcc can actually generate a pretty
> good version of it, unless you have some 64-bit add-with-carry
> instruction or something else that you could make use of.

We do have 32bit add-with-carry and it has it's own set of micro-architectural
hazards and stalls which deserve careful insn scheduling. So yes the mileage would
vary but certainly deserves a try.

>
>> Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
> Acked-by: Arnd Bergmann <arnd@...db.de>

Thanks,
-Vineet

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