https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92301
--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> --- Easier way how to bisect that is to use only these dbg-cnt options: -O3 -march=haswell -fdbg-cnt=vect_slp:0 -fdbg-cnt=vect_loop:3 which is first bad, vect_loop:2 is fine.