[Bug c/108880] [11/12/13 Regression] slow compilation with "-fsanitize=undefined"

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108880

--- Comment #12 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Sure, it worked for the testcase because the STATEMENT_LIST only had two stmts.
 I'm testing:

--- a/gcc/c-family/c-gimplify.cc
+++ b/gcc/c-family/c-gimplify.cc
@@ -516,7 +516,8 @@ c_genericize_control_stmt (tree *stmt_p, int
*walk_subtrees, void *data,
          tree t = tsi_stmt (i);
          if (TREE_CODE (t) != DEBUG_BEGIN_STMT && nondebug_stmts < 2)
        nondebug_stmts++;
-         walk_tree_1 (tsi_stmt_ptr (i), func, data, NULL, lh);
+         walk_tree_1 (tsi_stmt_ptr (i), func, data,
+              static_cast<hash_set<tree> *>(data), lh);
          if (TREE_CODE (t) != DEBUG_BEGIN_STMT
          && (nondebug_stmts > 1 || TREE_SIDE_EFFECTS (tsi_stmt (i))))
        clear_side_effects = false;
@@ -572,8 +573,9 @@ c_genericize (tree fndecl)
       bc_state_t save_state;
       push_cfun (DECL_STRUCT_FUNCTION (fndecl));
       save_bc_state (&save_state);
-      walk_tree_without_duplicates (&DECL_SAVED_TREE (fndecl),
-                   c_genericize_control_r, NULL);
+      hash_set<tree> pset;
+      walk_tree (&DECL_SAVED_TREE (fndecl), c_genericize_control_r, &pset,
+        &pset);
       restore_bc_state (&save_state);
       pop_cfun ();
     }