clarify some node comments

[libfirm] / ir / opt / tailrec.c

diff --git a/ir/opt/tailrec.c b/ir/opt/tailrec.c
index dc6f159..a294bde 100644 (file)
--- a/ir/opt/tailrec.c
+++ b/ir/opt/tailrec.c
@@ -22,7 +22,6 @@
  * @brief   Tail-recursion call optimization.
  * @date    08.06.2004
  * @author  Michael Beck
- * @version $Id$
  */
 #include "config.h"
 
@@ -594,12 +593,6 @@ static ir_graph_state_t do_tailrec(ir_graph *irg)
                        env.variants[i] = TR_DIRECT;
        }
 
-       /*
-        * This tail recursion optimization works best
-        * if the Returns are normalized.
-        */
-       normalize_n_returns(irg);
-
        ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
 
        end_block = get_irg_end_block(irg);
@@ -661,7 +654,7 @@ static ir_graph_state_t do_tailrec(ir_graph *irg)
                                break;
                        }
                        if (var == TR_DIRECT)
-                               var = env.variants[j];
+                       var = env.variants[j];
                        else if (env.variants[j] == TR_DIRECT)
                                env.variants[j] = var;
                        if (env.variants[j] != var) {
@@ -699,9 +692,14 @@ static ir_graph_state_t do_tailrec(ir_graph *irg)
        return 0;
 }
 
+
+/*
+ * This tail recursion optimization works best
+ * if the Returns are normalized.
+ */
 static optdesc_t opt_tailrec = {
        "tail-recursion",
-       IR_GRAPH_STATE_NO_BADS | IR_GRAPH_STATE_CONSISTENT_OUTS,
+       IR_GRAPH_STATE_MANY_RETURNS | IR_GRAPH_STATE_NO_BADS | IR_GRAPH_STATE_CONSISTENT_OUTS,
        do_tailrec,
 };