https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116762
Bug ID: 116762
Summary: gcc.dg/vect/pr52252-ld.c shows store permutation runs
into three vector limit
Product: gcc
Version: 15.0
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: ---
When failing vectorization without SLP we see that gcc.dg/vect/pr52252-ld.c
ends up using single-lane SLP. That's way better than what GCC 14 does which
is hybrid SLP but it might be possible to use a better strathegy for lowering
node 0x4b25cf0 (max_nunits=1, refcnt=1) vector(16) unsigned char
op: VEC_PERM_EXPR
{ }
lane permutation { 0[0] 0[1] 0[2] 1[0] }
children 0x4b25750 0x4b25990
that merges the three lane and single-lane values.
