/*
- * Copyright (C) 1995-2011 University of Karlsruhe. All right reserved.
- *
* This file is part of libFirm.
- *
- * This file may be distributed and/or modified under the terms of the
- * GNU General Public License version 2 as published by the Free Software
- * Foundation and appearing in the file LICENSE.GPL included in the
- * packaging of this file.
- *
- * Licensees holding valid libFirm Professional Edition licenses may use
- * this file in accordance with the libFirm Commercial License.
- * Agreement provided with the Software.
- *
- * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
- * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE.
+ * Copyright (C) 2012 University of Karlsruhe.
*/
/**
#include "firm_common.h"
#include "begin.h"
+/** @ingroup irana
+ * @defgroup ir_loop Loops
+ * @{
+ */
+
/** Returns non-zero if the predecessor pos is a backedge. */
FIRM_API int is_backedge(const ir_node *n, int pos);
/** Marks edge pos as a backedge. */
/** Loop elements: loop nodes and ir nodes */
typedef union {
- firm_kind *kind; /**< is either k_ir_node or k_ir_loop */
- ir_node *node; /**< Pointer to an ir_node element */
- ir_loop *son; /**< Pointer to an ir_loop element */
- ir_graph *irg; /**< Pointer to an ir_graph element (only callgraph loop trees) */
+ firm_kind *kind; /**< is either k_ir_node or k_ir_loop */
+ ir_node *node; /**< Pointer to an ir_node element */
+ ir_loop *son; /**< Pointer to an ir_loop element */
+ ir_graph *irg; /**< Pointer to an ir_graph element (only callgraph loop trees) */
} loop_element;
+/** Tests whether a given pointer points to a loop.
+ * @note only works reliably if @p thing points to something with a ::firm_kind
+ * header */
FIRM_API int is_ir_loop(const void *thing);
-/** Set the outermost loop in ir graph as basic access to loop tree. */
+/** Sets the outermost loop in ir graph as basic access to loop tree. */
FIRM_API void set_irg_loop(ir_graph *irg, ir_loop *l);
/** Returns the root loop info (if exists) for an irg. */
/** Returns the number of elements contained in loop. */
FIRM_API size_t get_loop_n_elements(const ir_loop *loop);
-/** Returns a loop element. A loop element can be interpreted as a
-kind pointer, an ir_node* or an ir_loop*. */
+/** Returns a loop element. A loop element can be interpreted as a
+ * kind pointer, an ir_node* or an ir_loop*. */
FIRM_API loop_element get_loop_element(const ir_loop *loop, size_t pos);
/** Returns a unique node number for the loop node to make output
/** A field to connect additional information to a loop. */
FIRM_API void set_loop_link(ir_loop *loop, void *link);
+/** Returns field with additional loop information.
+ * @see set_loop_link() */
FIRM_API void *get_loop_link(const ir_loop *loop);
/** Constructs backedge information and loop tree for a graph.
*
* This algorithm destoyes the link field of block nodes.
*
- * @returns Maximal depth of loop tree.
- *
* @remark
* One assumes, the Phi nodes in a block with a backedge have backedges
* at the same positions as the block. This is not the case, as
* edges, the cycle is removed. The second Phi node does not get a
* backedge!
*/
-FIRM_API int construct_backedges(ir_graph *irg);
+FIRM_API void construct_backedges(ir_graph *irg);
/**
* Construct Intra-procedural control flow loop tree for a IR-graph.
* This algorithm destroyes the link field of block nodes.
*
* @param irg the graph
- *
- * @returns Maximal depth of loop tree.
*/
-FIRM_API int construct_cf_backedges(ir_graph *irg);
+FIRM_API void construct_cf_backedges(ir_graph *irg);
/**
* Computes Intra-procedural control flow loop tree on demand.
* Resets all backedges. Works for any construction algorithm.
*/
FIRM_API void free_loop_information(ir_graph *irg);
-FIRM_API void free_all_loop_information (void);
+/** Removes loop information from all graphs in the current program. */
+FIRM_API void free_all_loop_information(void);
-/** Test whether a value is loop invariant.
+/** Tests whether a value is loop invariant.
*
* @param n The node to be tested.
* @param block A block node.
* belongs to or in inner loops of this block. */
FIRM_API int is_loop_invariant(const ir_node *n, const ir_node *block);
+/** @} */
+
#include "end.h"
#endif