[PATCH] tree-optimization/117343 - decide_masked_load_lanes and stale graph

[Richard Biener]

It turns out decide_masked_load_lanes accesses a stale SLP graph
so the following re-builds it instead.

Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.

        PR tree-optimization/117343
        * tree-vect-slp.cc (vect_optimize_slp_pass::build_vertices):
        Support re-building the SLP graph.
        (vect_optimize_slp_pass::run): Re-build the SLP graph before
        decide_masked_load_lanes.
---
 gcc/tree-vect-slp.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
index 2e98a943e06..a7f064bb0ed 100644
--- a/gcc/tree-vect-slp.cc
+++ b/gcc/tree-vect-slp.cc
@@ -5632,6 +5632,8 @@ vect_optimize_slp_pass::build_vertices ()
   hash_set<slp_tree> visited;
   unsigned i;
   slp_instance instance;
+  m_vertices.truncate (0);
+  m_leafs.truncate (0);
   FOR_EACH_VEC_ELT (m_vinfo->slp_instances, i, instance)
     build_vertices (visited, SLP_INSTANCE_TREE (instance));
 }
@@ -7244,6 +7246,8 @@ vect_optimize_slp_pass::run ()
     }
   else
     remove_redundant_permutations ();
+  free_graph (m_slpg);
+  build_graph ();
   decide_masked_load_lanes ();
   free_graph (m_slpg);
 }
-- 
2.43.0