Re: [PATCH 0/7] block-sha1: improved SHA1 hashing

From: Artur Skawina <art.08.09@gmail.com>
Date: Aug 8, 2009, 18:12 UTC
Message-ID: <4A7DC014.1030904@gmail.com>
In-Reply-To: <alpine.LFD.2.01.0908081004560.3288@localhost.localdomain>

Linus Torvalds wrote:

Show 6 quoted lines

> 
> On Sat, 8 Aug 2009, Artur Skawina wrote:
>> I've inlined the byteswapping in 'opensslb', maybe that one will
>> do a bit better.
> Hmm. Testing on my atom, the inlined bswap is worse, but the asm versions 
> are generally superior to any C one:

It loses on atom, but is the best one on both P3 and P4 here. Based on your other numbers I was expecting it to win on 32-bit nehalem too. gcc doing a better job of scheduling w/ 'linusv' wouldn't surprise though (since there are no spills, the data reads are about the only other thing that could make a difference. And, yes, they show up in the profiles; if x86 only had one more register...)

artur

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