https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120747
--- Comment #11 from Filip Kastl <pheeck at gcc dot gnu.org> --- So the file that is getting "miscompiled" is innerf.f. I found out by compiling this gromacs source file with r16-1550 GCC and all the other source files with r16-1549 GCC and then linking that together. I'll see if I can figure out in which part of innerf.f is the problem.