https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102483
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|unknown |12.0
Blocks| |53947
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's an interesting sub-case which we could eventually handle generally as a
mechanism for the final reduction. Note we need to constrain vector [us]sad
as to which lanes are summed, otherwise we might get them to spread to
4 integer lanes.
Of course the target could simply provide reduc_plus_scal_v4qi ...
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
