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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/108880] [11/12/13 Regression] slow compilation with
 "-fsanitize=undefined"
Date: Wed, 22 Feb 2023 19:50:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108880

--- Comment #10 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Another simple patch is

--- a/gcc/c-family/c-gimplify.cc
+++ b/gcc/c-family/c-gimplify.cc
@@ -516,7 +516,7 @@ c_genericize_control_stmt (tree *stmt_p, int
*walk_subtrees, void *data,
          tree t =3D tsi_stmt (i);
          if (TREE_CODE (t) !=3D DEBUG_BEGIN_STMT && nondebug_stmts < 2)
        nondebug_stmts++;
-         walk_tree_1 (tsi_stmt_ptr (i), func, data, NULL, lh);
+         walk_tree_without_duplicates_1 (tsi_stmt_ptr (i), func, data, lh);
          if (TREE_CODE (t) !=3D DEBUG_BEGIN_STMT
          && (nondebug_stmts > 1 || TREE_SIDE_EFFECTS (tsi_stmt (i))))
        clear_side_effects =3D false;=