https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108752
Bug ID: 108752
Summary: word_mode vectorization is pessimized by hard limit on
nunits
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
r13-5771-gdc87e1391c55c6 re-introduced a hard nunits limit to the vectorizer
when using emulated vectors (aka word_mode vectorization). That's because
this feature relies on vector lowering to implement plus, minus and negate
with bit operations and that has such limit in place for when dealing with
user written code that didn't have any cost modeling applied.
The fix is to emit supported operations from the vectorizer.
