[Bug c++/100322] Switching from std=c++17 to std=c++20 causes performance regression in relationals

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100322

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
So it's just bad codegen for <=> comparisons. Thanks, Barry.

The library part is a red herring, the operator> synthesized from <=> is fine
to use, it just produces bad code (with GCC, but not Clang).