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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/110739] std::format for chrono types compiles very
 slowly
Date: Wed, 19 Jul 2023 12:55:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110739

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 55580
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55580&action=3Dedit
Instantiate less code for chrono formatters, take 2

In this patch the converters like _S_date and _S_hms are called by _M_format
before passing the argument to _M_x, _M_d_e etc. so that those function
templates are only called with arguments that are already the right type. T=
his
reduces the number of different instantiations of those function templates.

But this doesn't really help either.=