* Purpose: Strength reduction.
* Author: Beyhan Veliev
* Modified by:
- * Created: 22.8.2003
+ * Created: 22.8.2004
* CVS-ID: $Id$
- * Copyright: (c) 2003 Universität Karlsruhe
+ * Copyright: (c) 2004 Universität Karlsruhe
* Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
*
*
# ifndef _STRENGTH_RED_H_
# define _STRENGTH_RED_H_
-# include "irgraph.h"
+#include "irnode.h"
+#include "irgraph.h"
+#include "irloop.h"
/** Performs strength reduction for the passed graph. */
void reduce_strength(ir_graph *irg);
+/* The information needed for an induction variable */
+# ifndef _STRENGTH_RED_TYP_
+# define _STRENGTH_RED_TYP_
+typedef struct _induct_var_info {
+ ir_op *operation_code; /**< The opcode of "op" */
+ ir_node *increment; /**< The value which increase or decrease the iteration variable. */
+ ir_node *init; /**< The start value of the iteration variable. */
+ ir_node *op; /**< The operation which increase or decrease the iteration variable. */
+ ir_node *itervar_phi; /**< The iteration variable. */
+ ir_node *new_phi; /**< The new iteration variable. */
+ ir_node *new_increment; /**< The new increment which replace the old one. */
+ ir_node *new_init; /**< The new init value of the iteration variable. */
+ ir_node *new_op; /**< The new operation that we need after replace. */
+ ir_node *new_cmp; /**< The new Cmp which replaces the old one. */
+ ir_node *cmp; /**< The Cmp which breaks the loop and compares the iteration variable with a constant. */
+ ir_node *cmp_const; /**< The other operand of Cmp. */
+ ir_node *cmp_init_block; /**< The initial block of the Cmp. */
+ ir_node *reducible_node; /**< The reducible nodes are save here. */
+ int is_reducible; /**< To save information if anything is reducible. */
+ int phi_pred; /**< To save the value of iteration variable predecessors. */
+ int init_pred_pos; /**< To save the position of iteration variable start value. */
+ int op_pred_pos; /**< To save the backedge of iteration variable. */
+ ir_loop *l_itervar_phi; /**< The loop of the induction variable */
+} induct_var_info;
+#endif
+/** If an ir_node is an induction variable return info else return NULL. */
+induct_var_info *is_induction_variable(induct_var_info *info);
#endif /* _STRENGTH_RED_H_ */