[Bug libfortran/91030] Poor performance of I/O -fconvert=big-endian

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91030

--- Comment #6 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
I cannot reproduce this on an AMD Ryzen 7 1700X (little-endian):

$ gfortran -fconvert=native wr.f90 walltime.c 
cc1: Warnung: command-line option »-fconvert=native« is valid for Fortran but
not for C
$ rm -f out.dat ; time ./a.out ; rm -f out.dat
 write time(sec) =    1.0676949024200439     
 done

real    0m1.399s
user    0m0.112s
sys     0m1.083s
$ gfortran -fconvert=big-endian wr.f90 walltime.c 
cc1: Warnung: command-line option »-fconvert=big-endian« is valid for Fortran
but not for C
$ rm -f out.dat ; time ./a.out ; rm -f out.dat
 write time(sec) =    1.4781639575958252     
 done

real    0m1.773s
user    0m0.397s
sys     0m1.196s

which looks reasonable.

Platform specific?  Which OS/processor combination did you test this on?