https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105451
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2022-05-02
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's difficult to even spot the difference in the SLP tree, but the
associatable multiplications make it somewhat random which of the valid SLP
tree representations we'll pick. All of the SLP discovery is a heuristically
greedy search for the _first_ match, not for the "best" even ("best"
interpreted as "largest" in case of BB vectorization).
The only thing that reliably happens at the moment is associating until the
leafs are all from one load group (until we support multiple load groups in
one leaf).
