+
+/* This will free "pending". */
+static void
+df_worklist_dataflow_overeager (struct dataflow *dataflow,
+ bitmap pending,
+ sbitmap considered,
+ int *blocks_in_postorder,
+ unsigned *bbindex_to_postorder)
+{
+ enum df_flow_dir dir = dataflow->problem->dir;
+ int count = 0;
+
+ while (!bitmap_empty_p (pending))
+ {
+ unsigned bb_index;
+ int index;
+ count++;
+
+ index = bitmap_first_set_bit (pending);
+ bitmap_clear_bit (pending, index);
+
+ bb_index = blocks_in_postorder[index];
+
+ if (dir == DF_FORWARD)
+ df_worklist_propagate_forward (dataflow, bb_index,
+ bbindex_to_postorder,
+ pending, considered);
+ else
+ df_worklist_propagate_backward (dataflow, bb_index,
+ bbindex_to_postorder,
+ pending, considered);
+ }
+
+ BITMAP_FREE (pending);
+
+ /* Dump statistics. */
+ if (dump_file)
+ fprintf (dump_file, "df_worklist_dataflow_overeager:"
+ "n_basic_blocks %d n_edges %d"
+ " count %d (%5.2g)\n",
+ n_basic_blocks, n_edges,
+ count, count / (float)n_basic_blocks);
+}
+
+static void
+df_worklist_dataflow_doublequeue (struct dataflow *dataflow,
+ bitmap pending,
+ sbitmap considered,
+ int *blocks_in_postorder,
+ unsigned *bbindex_to_postorder)
+{
+ enum df_flow_dir dir = dataflow->problem->dir;
+ int dcount = 0;
+ bitmap worklist = BITMAP_ALLOC (&df_bitmap_obstack);
+
+ /* Double-queueing. Worklist is for the current iteration,
+ and pending is for the next. */
+ while (!bitmap_empty_p (pending))
+ {
+ /* Swap pending and worklist. */
+ bitmap temp = worklist;
+ worklist = pending;
+ pending = temp;
+
+ do
+ {
+ int index;
+ unsigned bb_index;
+ dcount++;
+
+ index = bitmap_first_set_bit (worklist);
+ bitmap_clear_bit (worklist, index);
+
+ bb_index = blocks_in_postorder[index];
+
+ if (dir == DF_FORWARD)
+ df_worklist_propagate_forward (dataflow, bb_index,
+ bbindex_to_postorder,
+ pending, considered);
+ else
+ df_worklist_propagate_backward (dataflow, bb_index,
+ bbindex_to_postorder,
+ pending, considered);
+ }
+ while (!bitmap_empty_p (worklist));
+ }
+
+ BITMAP_FREE (worklist);
+ BITMAP_FREE (pending);
+
+ /* Dump statistics. */
+ if (dump_file)
+ fprintf (dump_file, "df_worklist_dataflow_doublequeue:"
+ "n_basic_blocks %d n_edges %d"
+ " count %d (%5.2g)\n",
+ n_basic_blocks, n_edges,
+ dcount, dcount / (float)n_basic_blocks);
+}
+