set_Block_MacroBlock() added

[r17913]

include/libfirm/irnode.h

@@ -403,6 +403,8 @@ ir_extblk *get_Block_extbb(const ir_node *block);
 void set_Block_extbb(ir_node *block, ir_extblk *extblk);
 /** Get the Macro Block header of a (sub-) block. */
 ir_node *get_Block_MacroBlock(const ir_node *block);
+/** Set the Macro Block header of a (sub-) block. */
+void set_Block_MacroBlock(ir_node *block, ir_node *mbh);
 /** Get the Macro Block header of a node. */
 ir_node *get_irn_MacroBlock(const ir_node *n);
 /** Returns the ir_graph this Block belongs to. */

ir/ir/irnode.c

@@ -806,7 +806,7 @@ void set_Block_extbb(ir_node *block, ir_extblk *extblk) {
 	block->attr.block.extblk = extblk;
 }
 
-/* returns the macro block header of a block. */
+/* Returns the macro block header of a block.*/
 ir_node *get_Block_MacroBlock(const ir_node *block) {
 	ir_node *mbh;
 	assert(is_Block(block));
@@ -817,6 +817,13 @@ ir_node *get_Block_MacroBlock(const ir_node *block) {
 	return mbh;
 }
 
+/* Sets the macro block header of a block. */
+void set_Block_MacroBlock(ir_node *block, ir_node *mbh) {
+	assert(is_Block(block));
+	assert(is_Block(mbh));
+	set_irn_n(block, -1, mbh);
+}
+
 /* returns the macro block header of a node. */
 ir_node *get_irn_MacroBlock(const ir_node *n) {
 	if (! is_Block(n)) {