[Bug libfortran/78549] Very slow formatted internal file output

["mecej4 at operamail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78549

--- Comment #2 from mecej4 at operamail dot com ---
Thanks, Martin. After posting, I found that I could add more add more
attachments, but I was a bit worried that, as in other forums, the initial post
could not be edited or modified.

I presume that you ran your confirmation runs on Linux. Even if the Fortran
version is three times slower than the C version, as you found, perhaps one
could live with that. However, on Windows(+Cygwin,Mingw,etc.) the performance
of the Fortran version is terrible, and I think that this reflects poorly on
the otherwise fine Gfortran compiler, which often outperforms expensive
commercial Fortran compilers in the quality of the generated code.

A collaborator tells me that the problem did not exist in the Windows/MinGW
release of Gfortran 4.9.3. I could not test that assertion myself because the
installer failed on my Windows 10 system.