https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96043
Bug ID: 96043
Summary: BB vectorizer costing lumps everything together
Product: gcc
Version: 11.0
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: ---
Currently the basic-block vectorizer sums up independent opportunities and
does an overall decision so that "good" vectorizations help "bad"
vectorizations to be considered and "bad" vectorizations could make "good"
vectorizations not to happen.
Instead the basic-block vectorizer should cost independent opportunities
(disjunct portions of the SLP graph) independently.
I'm struggling to find a testcase the basic-block vectorizer rejects
based on costing at the moment though...
