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

H.J. Lu
2008-03-06T17:14:22Z

On Thu, Mar 6, 2008 at 9:06 AM, H. Peter Anvin <hpa@zytor.com> wrote:
>
> H.J. Lu wrote:
> > On Thu, Mar 6, 2008 at 8:23 AM, Jakub Jelinek <jakub@redhat.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.
>

So that is the bug in the Linux kernel. Since fixing kernel is much easier
than providing a workaround in compilers, I think kernel should be fixed
and no need for icc/gcc fix.

H.J.