[Bug libfortran/93871] COTAN is slow for complex types

[thenlich at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93871

--- Comment #16 from Thomas Henlich <thenlich at gcc dot gnu.org> ---
Additional note:

The issue is not restricted to complex types, but also occurs for real types.

On i686-mingw32, by a factor 2...10 depending on kind.

However I could not measure any slowdown on i686-pc-linux-gnu. Due to this, and
my earlier confusion about mpc/mpfr, I chose not to include it in this bug
report.