[Bug c++/81476] severe slow-down with range-v3 library compared to clang

[h2+bugs at fsfe dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81476

--- Comment #5 from Hannes Hauswedell <h2+bugs at fsfe dot org> ---
> Please clarify if the problem is in compilation time (how long the compiler takes to compile the file), or in performance of generated code.

Performance of code.

> Please attach preprocessed testcase obtained with -E or -save-temps.

I have added intermediate code.

> For clang are you using GCC's libstdc++ or llvm's libc++?

For clang I am using libc++ (FreeBSD). I has no immediate luck trying to use
libstdc++ with clang (to exclude library issues), but I will give it another
shot later.