[Bug tree-optimization/95960] GCC should re-vectorize vector code with larger VF

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95960

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 48801
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48801&action=edit
start

So quick experiments show where we need to do adjustments.  We do have
an explicit SLP_TREE_LANES we could use for "true" scalar lanes as compared
to the number of "scalar" stmts but uses might have been transitioned not
exactly along this boundary.  Then there's of course 'group_size' which
can mean either depending on context.

The biggest churn is likely in dataref group analysis where we IMHO
also want a "lanes" representation.