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From: "kamkaz at windowslive dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/102015] [missed optimization] Small memory overhead
 in _Rb_tree_impl (fix would require ABI break)
Date: Sun, 22 Aug 2021 21:08:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102015

--- Comment #2 from Kamil Kaznowski <kamkaz at windowslive dot com> ---
(In reply to Andrew Pinski from comment #1)
> https://stackoverflow.com/questions/66573773/is-there-a-reason-for-8-byte=
s-
> of-size-overhead-in-libstdc-stdmultiset-map

This is my post, I forgot to post a bug that day.

There is also a mistake by me in the comments - MSVC _Compressed_pair works=
 by
template specialization, not SFINAE.=