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

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Date:	Thu, 6 Mar 2008 08:58:57 -0800
From:	"H.J. Lu" <hjl.tools@...il.com>
To:	"Jakub Jelinek" <jakub@...hat.com>
Cc:	"H. Peter Anvin" <hpa@...or.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

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.

H.J.
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