https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91030
--- Comment #4 from Thomas Koenig <tkoenig at gcc dot gnu.org> --- (In reply to David Edelsohn from comment #3) > Conversion carries an overhead, but the overhead need not be worse than > necessary. The conversion overhead for libgfortran is significantly worse > than for competing, proprietary compilers. > > -fconvert=big-endian relative to no conversion > Compiler Slowdown > -------- -------- > GFortran 1000% > IBM XLF 200% > Intel Fortran 20% Do you also have absolute numbers?