[gcc(refs/users/rguenth/heads/vect-force-slp)] Fix non-grouped SLP load/store accounting in alignment peeling

[gcc(refs/users/rguenth/heads/vect-force-slp)] Fix non-grouped SLP load/store accounting in alignment peeling

[Richard Biener]

https://gcc.gnu.org/g:89b9eeedc513042cbaa80b81bc9188a08c92a0bf

commit 89b9eeedc513042cbaa80b81bc9188a08c92a0bf
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Mar 5 16:07:41 2024 +0100

    Fix non-grouped SLP load/store accounting in alignment peeling
    
    When we have a non-grouped access we bogously multiply by zero.
    This shows most with single-lane SLP but also happens with
    the multi-lane splat case.
    
            * tree-vect-data-refs.cc (vect_enhance_data_refs_alignment):
            Properly guard DR_GROUP_SIZE access with STMT_VINFO_GROUPED_ACCESS.

Diff:
---
 gcc/tree-vect-data-refs.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/gcc/tree-vect-data-refs.cc b/gcc/tree-vect-data-refs.cc
index c531079d3bb..ae237407672 100644
--- a/gcc/tree-vect-data-refs.cc
+++ b/gcc/tree-vect-data-refs.cc
@@ -2290,8 +2290,11 @@ vect_enhance_data_refs_alignment (loop_vec_info loop_vinfo)
               if (unlimited_cost_model (LOOP_VINFO_LOOP (loop_vinfo)))
 		{
 		  poly_uint64 vf = LOOP_VINFO_VECT_FACTOR (loop_vinfo);
-		  nscalars = (STMT_SLP_TYPE (stmt_info)
-			      ? vf * DR_GROUP_SIZE (stmt_info) : vf);
+		  unsigned group_size = 1;
+		  if (STMT_SLP_TYPE (stmt_info)
+		      && STMT_VINFO_GROUPED_ACCESS (stmt_info))
+		    group_size = DR_GROUP_SIZE (stmt_info);
+		  nscalars = vf * group_size;
 		}
 
 	      /* Save info about DR in the hash table.  Also include peeling