https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #22 from Thomas de Bock ---
(In reply to Andi Kleen from comment #11)
> There is already -fno-semantic-interposition
>
> Also -flto / -fwhole-program should probably enable it.
I think:
-fno-semantic-interposition doesn't always gua
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #21 from Thomas de Bock ---
(In reply to Jakub Jelinek from comment #20)
> (In reply to Thomas de Bock from comment #18)
> > (In reply to Jason Merrill from comment #17)
> > > As I commented at
> > >
> > > https://inbox.sourceware.or
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #20 from Jakub Jelinek ---
(In reply to Thomas de Bock from comment #18)
> (In reply to Jason Merrill from comment #17)
> > As I commented at
> >
> > https://inbox.sourceware.org/gcc-patches/75ff8af8-af03-42fa-b68b-
> > e6c16a34c...@
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #19 from Jakub Jelinek ---
(In reply to Jason Merrill from comment #17)
> As I commented at
>
> https://inbox.sourceware.org/gcc-patches/75ff8af8-af03-42fa-b68b-
> e6c16a34c...@redhat.com/
>
> we could optimize the dynamic_cast to t
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #18 from Thomas de Bock ---
(In reply to Jason Merrill from comment #17)
> As I commented at
>
> https://inbox.sourceware.org/gcc-patches/75ff8af8-af03-42fa-b68b-
> e6c16a34c...@redhat.com/
>
> we could optimize the dynamic_cast to
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #17 from Jason Merrill ---
As I commented at
https://inbox.sourceware.org/gcc-patches/75ff8af8-af03-42fa-b68b-e6c16a34c...@redhat.com/
we could optimize the dynamic_cast to type_info::operator== instead of vtable
comparison.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #16 from Thomas de Bock ---
(In reply to Jakub Jelinek from comment #15)
> Sure, but that is the only way how to make the optimization reliable.
> If the a local type (i.e. mangled for RTTI with * character at the start),
> it can jus
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #15 from Jakub Jelinek ---
Sure, but that is the only way how to make the optimization reliable.
If the a local type (i.e. mangled for RTTI with * character at the start), it
can just do the name pointer comparison (or perhaps compare
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #14 from Thomas de Bock ---
I mean, since it compares the name field from the type_info, at least 1
additional dereference is used in replacing dynamic_cast typecheck with
typeinfo::operator== compared to a simple vtable comparison.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #13 from Thomas de Bock ---
(In reply to Jakub Jelinek from comment #12)
> I'd think it should just optimize __dynamic_cast to
> std::type_info::operator== in that case (if that is available) or, if not
> (i.e. not included) to
>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #12 from Jakub Jelinek ---
I'd think it should just optimize __dynamic_cast to std::type_info::operator==
in that case (if that is available) or, if not (i.e. not included)
to
if (__name == __arg.__name)
return true;
re
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
Andi Kleen changed:
What|Removed |Added
CC||andi-gcc at firstfloor dot org
--- Comment
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #10 from Thomas de Bock ---
After some searching and testing, I realise this optimization does in fact
malfunction from (at least version 17.0.1) clang when used with dlopen and
RTLD_LOCAL, though the optimization can be disabled with
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
Thomas de Bock changed:
What|Removed |Added
CC||tdebock at DRWUK dot com
--- Comment #9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #8 from Florian Weimer ---
There's this big comment in typeinfo:
// Determine whether typeinfo names for the same type are merged (in which
// case comparison can just compare pointers) or not (in which case strings
// must be compar
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
Andrew Pinski changed:
What|Removed |Added
CC||janschultke at googlemail dot
com
--- C
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #6 from Avi Kivity ---
I already owe you many beers, but this one is special.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #5 from Jonathan Wakely ---
Avi, in the BZ Preferences you can set "After changing a bug" to "Show the
updated bug" instead of jumping to the next one in the list.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #4 from Avi Kivity ---
Oops, last comment intended for a separate bug. Curse the bug list thing.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
--- Comment #3 from Avi Kivity ---
I have something like this:
│ 2680 future<> system_keyspace_make(distributed&
dist_db, distributed& dist_ss,
sharded& dist_gossiper, db::config& cfg) { │
│ 2681 register_virtual_tabl
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
Marc Glisse changed:
What|Removed |Added
Last reconfirmed||2021-05-26
Status|UNCONFIRMED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63164
Jakub Jelinek changed:
What|Removed |Added
CC||hubicka at gcc dot gnu.org,
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