+void collect_phiprojs(ir_graph *irg) {
+ assert((ir_resources_reserved(irg) & (IR_RESOURCE_IRN_LINK|IR_RESOURCE_PHI_LIST)) ==
+ (IR_RESOURCE_IRN_LINK|IR_RESOURCE_PHI_LIST));
+ irg_walk_graph(irg, firm_clear_node_and_phi_links, collect_phiprojs_walker, NULL);
+}
+
+/*--------------------------------------------------------------------*/
+/* Functionality for part_block */
+/*--------------------------------------------------------------------*/
+
+/**
+ * Moves node and all predecessors of node from from_bl to to_bl.
+ * Does not move predecessors of Phi nodes (or block nodes).
+ */
+static void move(ir_node *node, ir_node *from_bl, ir_node *to_bl) {
+ int i, arity;
+
+ /* move this node */
+ set_nodes_block(node, to_bl);
+
+ /* move its Projs */
+ if (get_irn_mode(node) == mode_T) {
+ ir_node *proj = get_irn_link(node);
+ while (proj) {
+ if (get_nodes_block(proj) == from_bl)
+ set_nodes_block(proj, to_bl);
+ proj = get_irn_link(proj);
+ }
+ }
+
+ /* recursion ... */
+ if (is_Phi(node))
+ return;
+
+ arity = get_irn_arity(node);
+ for (i = 0; i < arity; i++) {
+ ir_node *pred = get_irn_n(node, i);
+ if (get_nodes_block(pred) == from_bl)
+ move(pred, from_bl, to_bl);
+ }
+}
+
+void part_block(ir_node *node) {
+ ir_node *new_block;
+ ir_node *old_block;
+ ir_node *phi;
+ ir_node *mbh;
+ ir_node *next, *block;
+
+ /* Turn off optimizations so that blocks are not merged again. */
+ int rem_opt = get_opt_optimize();
+ set_optimize(0);
+
+ /* Transform the control flow */
+ old_block = get_nodes_block(node);
+ mbh = get_Block_MacroBlock(old_block);
+ new_block = new_Block(get_Block_n_cfgpreds(old_block),
+ get_Block_cfgpred_arr(old_block));
+
+ if (mbh != old_block) {
+ /* we splitting a partBlock */
+ set_Block_MacroBlock(new_block, mbh);
+ } else {
+ /* we are splitting a header: this creates a new header */
+ set_Block_MacroBlock(new_block, new_block);
+ }
+ set_irg_current_block(current_ir_graph, new_block);
+ {
+ ir_node *jmp = new_Jmp();
+ set_irn_in(old_block, 1, &jmp);
+ irn_vrfy_irg(old_block, current_ir_graph);
+ }
+
+ /* move node and its predecessors to new_block */
+ move(node, old_block, new_block);
+
+ /* move Phi nodes to new_block */
+ phi = get_Block_phis(old_block);
+ set_Block_phis(new_block, phi);
+ set_Block_phis(old_block, NULL);
+ while (phi) {
+ set_nodes_block(phi, new_block);
+ phi = get_Phi_next(phi);
+ }
+
+ /* rewire partBlocks */
+ if (mbh != old_block) {
+ ir_node *list = NULL;
+
+ /* move blocks from mbh to old_block if old_block dominates them */
+ block = get_irn_link(mbh);
+
+ set_irn_link(mbh, NULL);
+ set_Block_MacroBlock(old_block, old_block);
+
+ /* note that we must splice the list of partBlock here */
+ for (; block != NULL; block = next) {
+ ir_node *curr = block;
+ assert(is_Block(curr));
+
+ next = get_irn_link(block);
+
+ if (block == old_block)
+ continue;
+
+ assert(get_Block_MacroBlock(curr) == mbh);
+
+ for (;;) {
+ if (curr == old_block) {
+ /* old_block dominates the block, so old_block will be
+ the new macro block header */
+ set_Block_MacroBlock(block, old_block);
+ set_irn_link(block, list);
+ list = block;
+ break;
+ }
+ if (curr == mbh) {
+ /* leave it in the mbh */
+ set_irn_link(block, get_irn_link(mbh));
+ set_irn_link(mbh, block);
+ break;
+ }
+
+ assert(get_Block_n_cfgpreds(curr) == 1);
+ curr = get_Block_cfgpred_block(curr, 0);
+ }
+ }
+ /* beware: do NOT directly manipulate old_block's list, as old_block is
+ in mbh's list and this would destroy the list! */
+ set_irn_link(old_block, list);
+
+ /* finally add new_block to mbh's list */
+ set_irn_link(new_block, get_irn_link(mbh));
+ set_irn_link(mbh, new_block);
+ } else {
+ /* move blocks from mbh to new_block */
+ block = get_irn_link(mbh);
+
+ set_irn_link(mbh, NULL);
+ set_irn_link(new_block, NULL);
+
+ for (; block != NULL; block = next) {
+ next = get_irn_link(block);
+
+ set_Block_MacroBlock(block, new_block);
+ set_irn_link(block, get_irn_link(new_block));
+ set_irn_link(new_block, block);
+ }
+ }
+
+ set_optimize(rem_opt);
+}
+
+/* kill a node by setting its predecessors to Bad and finally exchange the node by Bad itself. */
+void kill_node(ir_node *node) {
+ ir_graph *irg = get_irn_irg(node);
+ ir_node *bad = get_irg_bad(irg);
+ int i;
+
+ for (i = get_irn_arity(node) - 1; i >= -1; --i) {
+ set_irn_n(node, i, bad);
+ }
+ exchange(node, bad);