tree-optimization/117343 - decide_masked_load_lanes and stale graph

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

	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.

diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
index 2e98a943e0615d503a10a60828dfc85a230505f2..a7f064bb0edf8b0b28020c1d30a38b046c82cdaf 100644 (file)
--- 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);
 }