[gcc r15-4738] tree-optimization/117343 - decide_masked_load_lanes and stale graph

[Richard Biener via Gcc-cvs]

https://gcc.gnu.org/g:9999cc79e9866ba33dea0256078f4557d92d80d9

commit r15-4738-g9999cc79e9866ba33dea0256078f4557d92d80d9
Author: Richard Biener <rguent...@suse.de>
Date:   Tue Oct 29 11:26:13 2024 +0100

    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:
---
 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 2e98a943e061..a7f064bb0edf 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);
 }