https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110062
--- Comment #5 from Jan Hubicka <hubicka at gcc dot gnu.org> --- In sharpening the number of iterations depends on sharpen radius. Not sure what it is for the benchmark, but in normal situations the number of iterations is indeed not very large. However clang simply slp vectorizes the red&green channels into vector of size 2.
