From: Richard Biener <rguenther@suse.de>
Date: Tue, 5 Mar 2024 15:07:41 +0000 (+0100)
Subject: Fix non-grouped SLP load/store accounting in alignment peeling
X-Git-Tag: basepoints/gcc-16~9232
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b6822bf3e3f3ff37d64be700f139c8fce3a9bf44;p=thirdparty%2Fgcc.git

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 --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