From: Richard Biener <rguenther@suse.de>
Date: Fri, 25 Aug 2023 07:42:16 +0000 (+0200)
Subject: tree-optimization/111136 - STMT_VINFO_SLP_VECT_ONLY and stores
X-Git-Tag: basepoints/gcc-15~6662
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a739bac402ea5a583e43dbd01c14ebaff317c885;p=thirdparty%2Fgcc.git

tree-optimization/111136 - STMT_VINFO_SLP_VECT_ONLY and stores

vect_dissolve_slp_only_groups currently only expects loads, for stores
we have to make sure to mark the dissolved "groups" strided.

	PR tree-optimization/111136
	* tree-vect-loop.cc (vect_dissolve_slp_only_groups): For
	stores force STMT_VINFO_STRIDED_P and also duplicate that
	to all elements.
---

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index ebee8037e027..23c6e8259e7b 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -2453,8 +2453,13 @@ vect_dissolve_slp_only_groups (loop_vec_info loop_vinfo)
 		  DR_GROUP_FIRST_ELEMENT (vinfo) = vinfo;
 		  DR_GROUP_NEXT_ELEMENT (vinfo) = NULL;
 		  DR_GROUP_SIZE (vinfo) = 1;
-		  if (STMT_VINFO_STRIDED_P (first_element))
-		    DR_GROUP_GAP (vinfo) = 0;
+		  if (STMT_VINFO_STRIDED_P (first_element)
+		      /* We cannot handle stores with gaps.  */
+		      || DR_IS_WRITE (dr_info->dr))
+		    {
+		      STMT_VINFO_STRIDED_P (vinfo) = true;
+		      DR_GROUP_GAP (vinfo) = 0;
+		    }
 		  else
 		    DR_GROUP_GAP (vinfo) = group_size - 1;
 		  /* Duplicate and adjust alignment info, it needs to