https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
Bug 53947 depends on bug 121120, which changed state.
Bug 121120 Summary: Missed vectorization of default struct equality operator
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121120
What|Removed |Added
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121120
Thomas de Bock changed:
What|Removed |Added
Status|RESOLVED|WAITING
Keywords|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121120
Bug ID: 121120
Summary: Missed vectorization of default struct equality
operator
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
P
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 #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 #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 #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 #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
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