linux-kernel - Re: x86-64: memset()/memcpy() not fully standards compliant

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Message-ID: <20120106110812.GA24369@elte.hu>
Date:	Fri, 6 Jan 2012 12:08:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Jan Beulich <JBeulich@...e.com>,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: x86-64: memset()/memcpy() not fully standards compliant


* Andi Kleen <andi@...stfloor.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
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