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

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Message-ID: <4F0630CC.7050001@zytor.com>
Date:	Thu, 05 Jan 2012 15:22:52 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Jan Beulich <JBeulich@...e.com>, mingo@...e.hu, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: x86-64: memset()/memcpy() not fully standards compliant

On 01/05/2012 10:28 AM, Andi Kleen wrote:
>>
>> Otherwise, is there any rationale for this sort of lurking bug?
> 
> Most (all?) of the CPUs I cared about when writing that code had 
> bugs with string instructions and >4GB.
> 

Is that still true, and do we even use string instructions still on
those old CPUs?  Jan's fixes don't introduce any additional delays in
the non-string-instruction paths.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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