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Date: Sun, 12 Jun 2011 15:45:00 -0000
Message-ID: <BANLkTimpPtQfbrLPNgqh_WSSNq-VRPEpuQ@mail.gmail.com>
Subject: Re: Cgraph alias reorg 15/14 (New infrastructure for same body aliases)
From: "H.J. Lu" <hjl.tools@gmail.com>
To: Jan Hubicka <hubicka@ucw.cz>
Cc: gcc-patches@gcc.gnu.org
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On Sun, Jun 12, 2011 at 7:54 AM, Jan Hubicka <hubicka@ucw.cz> wrote:
>>
>> This also pretty much destroyed C++ for ia32:
>>
>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D49378
>> http://gcc.gnu.org/ml/gcc-regression/2011-06/msg00159.html
>
> Hi,
> It seems somewhat amazing that we hit kernel sensitive miscompilation her=
e.
> The problem most probably is the fact that thunks and functions with thun=
ks can become
> local. This is correct since thunks are represented as direct calls now, =
but this
> makes i386 to use local ABI when calling or compiling them.
>
> Does the following patch help? We may also need to look for the presence =
of thunk
> callers.
>
> Index: ipa.c
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- ipa.c =A0 =A0 =A0 (revision 174958)
> +++ ipa.c =A0 =A0 =A0 (working copy)
> @@ -120,6 +120,7 @@ static bool
> =A0cgraph_non_local_node_p_1 (struct cgraph_node *node, void *data ATTRIB=
UTE_UNUSED)
> =A0{
> =A0 =A0return !(cgraph_only_called_directly_or_aliased_p (node)
> + =A0 =A0 =A0 =A0 =A0 && !ipa_ref_has_aliases_p (&node->ref_list)
> =A0 =A0 =A0 =A0 =A0 =A0&& node->analyzed
> =A0 =A0 =A0 =A0 =A0 =A0&& !DECL_EXTERNAL (node->decl)
> =A0 =A0 =A0 =A0 =A0 =A0&& !node->local.externally_visible
> @@ -132,7 +133,11 @@ cgraph_non_local_node_p_1 (struct cgraph
> =A0static bool
> =A0cgraph_local_node_p (struct cgraph_node *node)
> =A0{
> - =A0 return !cgraph_for_node_and_aliases (cgraph_function_or_thunk_node =
(node, NULL),
> + =A0 struct cgraph_node *n =3D cgraph_function_or_thunk_node (node, NULL=
);
> +
> + =A0 if (n->thunk.thunk_p)
> + =A0 =A0 return false;
> + =A0 return !cgraph_for_node_and_aliases (n,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0cgraph_non_local_node_p_1, NULL, true);
>
> =A0}
>

I am testing it now.  Will know the results in 2 hours.

Thanks.

--=20
H.J.