https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120614
--- Comment #19 from kugan at gcc dot gnu.org --- I did the spec2017 runs few days ago and the .gcov files looks OK. I can see them with dump_gcov. I am seeing hot/cold blocks switched in __material_mod_MOD_mat_updatee/13 of fotonik3d_r (see the values in comment 17). This looks odd. We were also looking at the profile count issues with CSE/ICF like optimisations. https://lists.llvm.org/pipermail/llvm-dev/2020-November/146694.html looks like the way to go.
