[gcc r11-3526] move permute optimization to optimize-slp

[Richard Biener]

https://gcc.gnu.org/g:b1570930df659ff3ea6691f9ba8b84c8a189d85d

commit r11-3526-gb1570930df659ff3ea6691f9ba8b84c8a189d85d
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Sep 29 12:01:26 2020 +0200

    move permute optimization to optimize-slp
    
    This moves optimizing permutes of SLP reductions to vect_optimize_slp,
    eliding the global slp_loads array.
    
    2020-09-29  Richard Biener  <rguenther@suse.de>
    
            * tree-vect-slp.c (vect_analyze_slp): Move SLP reduction
            re-arrangement and SLP graph load gathering...
            (vect_optimize_slp): ... here.
            * tree-vectorizer.h (vec_info::slp_loads): Remove.

Diff:
---
 gcc/tree-vect-slp.c   | 19 ++++++++++---------
 gcc/tree-vectorizer.h |  1 -
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c
index c44fd396bf0..8de24802538 100644
--- a/gcc/tree-vect-slp.c
+++ b/gcc/tree-vect-slp.c
@@ -2486,8 +2486,15 @@ vect_analyze_slp (vec_info *vinfo, unsigned max_tree_size)
       vect_free_slp_tree ((*it).second);
   delete bst_map;
 
+  return opt_result::success ();
+}
+
+void
+vect_optimize_slp (vec_info *vinfo)
+{
   /* Optimize permutations in SLP reductions.  */
   slp_instance instance;
+  unsigned i;
   FOR_EACH_VEC_ELT (vinfo->slp_instances, i, instance)
     {
       slp_tree node = SLP_INSTANCE_TREE (instance);
@@ -2500,20 +2507,14 @@ vect_analyze_slp (vec_info *vinfo, unsigned max_tree_size)
     }
 
   /* Gather all loads in the SLP graph.  */
+  auto_vec<slp_tree> slp_loads;
   hash_set<slp_tree> visited;
   FOR_EACH_VEC_ELT (vinfo->slp_instances, i, instance)
-    vect_gather_slp_loads (vinfo->slp_loads, SLP_INSTANCE_TREE (instance),
+    vect_gather_slp_loads (slp_loads, SLP_INSTANCE_TREE (instance),
 			   visited);
 
-  return opt_result::success ();
-}
-
-void
-vect_optimize_slp (vec_info *vinfo)
-{
   slp_tree node;
-  unsigned i;
-  FOR_EACH_VEC_ELT (vinfo->slp_loads, i, node)
+  FOR_EACH_VEC_ELT (slp_loads, i, node)
     {
       if (!SLP_TREE_LOAD_PERMUTATION (node).exists ())
 	continue;
diff --git a/gcc/tree-vectorizer.h b/gcc/tree-vectorizer.h
index b7fa6bc8d2f..e62f1ccee8d 100644
--- a/gcc/tree-vectorizer.h
+++ b/gcc/tree-vectorizer.h
@@ -359,7 +359,6 @@ public:
 
   /* The SLP graph.  */
   auto_vec<slp_instance> slp_instances;
-  auto_vec<slp_tree> slp_loads;
 
   /* Maps base addresses to an innermost_loop_behavior that gives the maximum
      known alignment for that base.  */