[gcc r12-3619] Revert no longer needed fix for PR95539

[Richard Biener]

https://gcc.gnu.org/g:4703182a06b831a9f47a5f8198e86042cadd938d

commit r12-3619-g4703182a06b831a9f47a5f8198e86042cadd938d
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Sep 17 12:48:09 2021 +0200

    Revert no longer needed fix for PR95539
    
    The workaround is no longer necessary since we maintain alignment
    info on the DR group leader only.
    
    2021-09-17  Richard Biener  <rguenther@suse.de>
    
            * tree-vect-stmts.c (vectorizable_load): Do not frob
            stmt_info for SLP.

Diff:
---
 gcc/tree-vect-stmts.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c
index 4e0b2adf1dc..ce79d883dbf 100644
--- a/gcc/tree-vect-stmts.c
+++ b/gcc/tree-vect-stmts.c
@@ -8515,17 +8515,6 @@ vectorizable_load (vec_info *vinfo,
   if (!STMT_VINFO_DATA_REF (stmt_info))
     return false;
 
-  /* ???  Alignment analysis for SLP looks at SLP_TREE_SCALAR_STMTS[0]
-     for unpermuted loads but we get passed SLP_TREE_REPRESENTATIVE
-     which can be different when reduction chains were re-ordered.
-     Now that we figured we're a dataref reset stmt_info back to
-     SLP_TREE_SCALAR_STMTS[0].  When we're SLP only things should be
-     refactored in a way to maintain the dr_vec_info pointer for the
-     relevant access explicitely.  */
-  stmt_vec_info orig_stmt_info = stmt_info;
-  if (slp_node)
-    stmt_info = SLP_TREE_SCALAR_STMTS (slp_node)[0];
-
   tree mask = NULL_TREE, mask_vectype = NULL_TREE;
   if (gassign *assign = dyn_cast <gassign *> (stmt_info->stmt))
     {
@@ -8768,7 +8757,7 @@ vectorizable_load (vec_info *vinfo,
 	dump_printf_loc (MSG_NOTE, vect_location,
 			 "Vectorizing an unaligned access.\n");
 
-      STMT_VINFO_TYPE (orig_stmt_info) = load_vec_info_type;
+      STMT_VINFO_TYPE (stmt_info) = load_vec_info_type;
       vect_model_load_cost (vinfo, stmt_info, ncopies, vf, memory_access_type,
 			    &gs_info, slp_node, cost_vec);
       return true;