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From: "fdumont at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/96088] Range insertion into unordered_map is less
 effective than a loop with insertion
Date: Tue, 04 Aug 2020 17:36:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96088

Fran=C3=A7ois Dumont <fdumont at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2020-08-04
           Assignee|unassigned at gcc dot gnu.org      |fdumont at gcc dot =
gnu.org

--- Comment #5 from Fran=C3=A7ois Dumont <fdumont at gcc dot gnu.org> ---
After further investigation the unordered containers are also suffering fro=
m a
problem similar to libstdc++/87194. There are several places where we
constraint the iterator value_type to be an instance of container key_type
forcing the compiler to generate temporaries.

I'll fix that so that the nice enhancements already proposed can indeed wor=
k.=