Improve dump when SLP fails to compute lane extraction insertion points

The following helps debugging.

	* tree-vect-slp.cc (vect_bb_slp_mark_live_stmts): Enhance
	dumping in the failure case.

diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
index ff11b392305db07e7691d8c3dc7e3eee134aa78d..7abf0faa765e678f5560fc7ffb88a5deabfc97a8 100644 (file)
--- a/gcc/tree-vect-slp.cc
+++ b/gcc/tree-vect-slp.cc
@@ -9082,7 +9082,8 @@ vect_bb_slp_mark_live_stmts (bb_vec_info bb_vinfo, slp_tree node,
                    if (dump_enabled_p ())
                      dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
                                       "Cannot determine insertion place for "
-                                      "lane extract\n");
+                                      "lane extract of %T at node %p\n",
+                                      DEF_FROM_PTR (def_p), (void *)node);
                    can_insert = false;
                    break;
                  }