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From: "dartdart26 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/101923] std::function's move ctor is slower
 than the copy one for empty source objects
Date: Wed, 18 Aug 2021 06:02:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101923

Petar Ivanov <dartdart26 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

--- Comment #9 from Petar Ivanov <dartdart26 at gmail dot com> ---
(In reply to CVS Commits from comment #8)
> The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:
>=20
> https://gcc.gnu.org/g:0808b0df9c4d31f4c362b9c85fb538b6aafcb517
>=20
> commit r12-2959-g0808b0df9c4d31f4c362b9c85fb538b6aafcb517
> Author: Jonathan Wakely <jwakely@redhat.com>
> Date:   Tue Aug 17 11:30:56 2021 +0100
>=20
>     libstdc++: Optimize std::function move constructor [PR101923]
>=20=20=20=20=20

Thank you!

On ARM64, it is now identical to copy:

-----------------------------------------------------
Benchmark           Time             CPU   Iterations
-----------------------------------------------------
copy            0.948 ns        0.948 ns    558822565
move            0.952 ns        0.952 ns    729210032=