linux-kernel - Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI wrt direction flag

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Date:	Thu, 06 Mar 2008 09:06:50 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"H.J. Lu" <hjl.tools@...il.com>
CC:	Jakub Jelinek <jakub@...hat.com>,
	NightStrike <nightstrike@...il.com>,
	Olivier Galibert <galibert@...ox.com>,
	Chris Lattner <clattner@...le.com>,
	Michael Matz <matz@...e.de>,
	Richard Guenther <richard.guenther@...il.com>,
	Joe Buck <Joe.Buck@...opsys.com>, Jan Hubicka <hubicka@....cz>,
	Aurelien Jarno <aurelien@...el32.net>,
	linux-kernel@...r.kernel.org, gcc@....gnu.org
Subject: Re: RELEASE BLOCKER: Linux doesn't follow x86/x86-64 ABI wrt direction
 flag

H.J. Lu wrote:
> On Thu, Mar 6, 2008 at 8:23 AM, Jakub Jelinek <jakub@...hat.com> wrote:
>> On Thu, Mar 06, 2008 at 07:50:12AM -0800, H. Peter Anvin wrote:
>>  > H.J. Lu wrote:
>>  > >I agree with it. There is no  right or wrong here Let's start from
>>  > >scratch and figure out
>>  > >what is the best way to handle this, assuming we are defining a new psABI.
>>
>>  BTW, just tested icc and icc doesn't generate cld either (so it matches the
>>  new gcc behavior).
>>  char buf1[32], buf2[32];
>>  void bar (void);
>>  void foo (void)
>>  {
>>   __builtin_memset (buf1, 0, 32);
>>   bar ();
>>   __builtin_memset (buf2, 0, 32);
>>  }
>>
> 
> Icc follows the psABI. If we are saying icc/gcc 4.3 need a fix, we'd
> better define
> a new psABI first.
> 

Not a fix, an (optional) workaround for a system bug.

	-hpa
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