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

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Message-ID: <20080306162353.GF24887@devserv.devel.redhat.com>
Date:	Thu, 6 Mar 2008 11:23:53 -0500
From:	Jakub Jelinek <jakub@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"H.J. Lu" <hjl.tools@...il.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 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);
}

	Jakub
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