[gcc r15-112] Improve SLP dump and graph

[gcc r15-112] Improve SLP dump and graph

[Richard Biener]

https://gcc.gnu.org/g:bf33fe90e75c2c463d77f83d9a44dc61abe087f5

commit r15-112-gbf33fe90e75c2c463d77f83d9a44dc61abe087f5
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Mar 27 10:53:11 2024 +0100

    Improve SLP dump and graph
    
    The following notes which lanes are considered live and adds an overload
    to produce a graphviz graph for multiple entries into an SLP graph.
    
            * tree-vect-slp.cc (vect_print_slp_tree): Mark live lanes.
            (dot_slp_tree): New overload for multiple entries.

Diff:
---
 gcc/tree-vect-slp.cc | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
index 133606fa6f3..3eb326d20b5 100644
--- a/gcc/tree-vect-slp.cc
+++ b/gcc/tree-vect-slp.cc
@@ -2759,7 +2759,9 @@ vect_print_slp_tree (dump_flags_t dump_kind, dump_location_t loc,
     }
   if (SLP_TREE_SCALAR_STMTS (node).exists ())
     FOR_EACH_VEC_ELT (SLP_TREE_SCALAR_STMTS (node), i, stmt_info)
-      dump_printf_loc (metadata, user_loc, "\tstmt %u %G", i, stmt_info->stmt);
+      dump_printf_loc (metadata, user_loc, "\t%sstmt %u %G",
+		       STMT_VINFO_LIVE_P (stmt_info) ? "[l] " : "",
+		       i, stmt_info->stmt);
   else
     {
       dump_printf_loc (metadata, user_loc, "\t{ ");
@@ -2840,6 +2842,23 @@ dot_slp_tree (const char *fname, slp_tree node)
   fclose (f);
 }
 
+DEBUG_FUNCTION void
+dot_slp_tree (const char *fname, const vec<slp_instance> &slp_instances)
+{
+  FILE *f = fopen (fname, "w");
+  fprintf (f, "digraph {\n");
+  fflush (f);
+    {
+      debug_dump_context ctx (f);
+      hash_set<slp_tree> visited;
+      for (auto inst : slp_instances)
+	dot_slp_tree (f, SLP_INSTANCE_TREE (inst), visited);
+    }
+  fflush (f);
+  fprintf (f, "}\n");
+  fclose (f);
+}
+
 /* Dump a slp tree NODE using flags specified in DUMP_KIND.  */
 
 static void