linux-kernel - Re: [PATCH v1] lib/vsprintf.c: Even faster decimal conversion

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Message-ID: <87oanopsvf.fsf@rasmusvillemoes.dk>
Date:	Thu, 19 Mar 2015 22:41:40 +0100
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Peter Zijlstra \(Intel\)" <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>, Joe Perches <joe@...ches.com>,
	linux-kernel@...r.kernel.org,
	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
Subject: Re: [PATCH v1] lib/vsprintf.c: Even faster decimal conversion

On Wed, Mar 11 2015, Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Wed, 11 Mar 2015 00:01:11 +0100 Rasmus Villemoes <linux@...musvillemoes.dk> wrote:
>> Test and verification code on github
>> <https://github.com/Villemoes/dec>.  It would be nice if someone could
>> verify the code on architectures other than x86 - in particular, I
>> believe it _should_ work on big-endian, but I have no way of testing
>> that. Benchmark numbers would be nice too, of course.
>
> That would be nice.
>
> It would be best to make this as easy as possible for people.

Verification passed on both ppc64le and ppc64; the microbenchmark showed
improvements in 13-43% range for ppc64le and 13-34% for ppc64.

Thanks to Nishanth Aravamudan.

Rasmus
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