[gcc r14-9011] tree-optimization/111156 - properly dissolve SLP only groups

[Richard Biener]

https://gcc.gnu.org/g:b312cf21afd62b43fbc5034703e2796b0c3c416d

commit r14-9011-gb312cf21afd62b43fbc5034703e2796b0c3c416d
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Feb 15 13:41:25 2024 +0100

    tree-optimization/111156 - properly dissolve SLP only groups
    
    The following fixes the omission of failing to look at pattern
    stmts when we need to dissolve SLP only groups.
    
            PR tree-optimization/111156
            * tree-vect-loop.cc (vect_dissolve_slp_only_groups): Look
            at the pattern stmt if any.

Diff:
---
 gcc/tree-vect-loop.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 9e26b09504df..5a5865c42fc6 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -2551,7 +2551,8 @@ vect_dissolve_slp_only_groups (loop_vec_info loop_vinfo)
   FOR_EACH_VEC_ELT (datarefs, i, dr)
     {
       gcc_assert (DR_REF (dr));
-      stmt_vec_info stmt_info = loop_vinfo->lookup_stmt (DR_STMT (dr));
+      stmt_vec_info stmt_info
+	= vect_stmt_to_vectorize (loop_vinfo->lookup_stmt (DR_STMT (dr)));
 
       /* Check if the load is a part of an interleaving chain.  */
       if (STMT_VINFO_GROUPED_ACCESS (stmt_info))