https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96208
Bug ID: 96208
Summary: non-power-of-2 group size can be vectorized for
2-element vectors case
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: dpochepk at gmail dot com
Target Milestone: ---
Created attachment 48879
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48879&action=edit
initial implementation
Current loop vectorizer only vectorize loops with groups size being power-of-2
or 3 due to vector permutation generation algorithm specifics.
However, in case of 2-element vectors, simple permutation schema can be used to
support any group size: insert each vector element into required position,
which leads to reasonable amount of operations in case of 2-element vectors.
Initial version is attached.
