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From: Ingo Molnar <mingo@elte.hu>
To: Andi Kleen <andi@firstfloor.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Jan Beulich <JBeulich@suse.com>,
	tglx@linutronix.de, linux-kernel@vger.kernel.org
Subject: Re: x86-64: memset()/memcpy() not fully standards compliant
Date: Fri, 6 Jan 2012 12:08:12 +0100	[thread overview]
Message-ID: <20120106110812.GA24369@elte.hu> (raw)
In-Reply-To: <20120106094922.GU11715@one.firstfloor.org>


* Andi Kleen <andi@firstfloor.org> wrote:

> You would slow a critical fast path operation down for 
> something that never happens?!?  There were big differences 
> between strings and the unrolled loop for several.

AFAICS Jan's approach speeds up memset(), so what you say is 
100% pure nonsense.

Thanks,

	Ingo

  parent reply	other threads:[~2012-01-06 11:10 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-01-05 14:04 Jan Beulich
2012-01-05 15:27 ` hpanvin@gmail.com
2012-01-05 18:28 ` Andi Kleen
2012-01-05 23:22   ` H. Peter Anvin
2012-01-06  1:47     ` Andi Kleen
2012-01-06  2:03       ` H. Peter Anvin
2012-01-06  7:22         ` Jan Beulich
2012-01-06  9:49         ` Andi Kleen
2012-01-06 10:22           ` Jan Beulich
2012-01-06 10:37             ` Andi Kleen
2012-01-06 10:50               ` Jan Beulich
2012-01-06 11:08                 ` Andi Kleen
2012-01-06 12:25                   ` Jan Beulich
2012-01-06 19:44                     ` Andi Kleen
2012-01-06 23:12                       ` H. Peter Anvin
2012-01-06 11:08           ` Ingo Molnar [this message]
2012-01-06 20:40 ` Valdis.Kletnieks
2012-01-09  8:29   ` Jan Beulich

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