https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103977
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
/* For epilogues start the analysis from the first mode. The motivation
behind starting from the beginning comes from cases where the VECTOR_MODES
array may contain length-agnostic and length-specific modes. Their
ordering is not guaranteed, so we could end up picking a mode for the main
loop that is after the epilogue's optimal mode. */
mode_i = 1;
that's only valid if vector_modes.length () > 1 but for the testcase it only
contains the artificial VOIDmode aka autodetect mode. I wonder why
we don't start from 0?
