-/**
- * @file irlwrdw.h
- * @date 8.10.2004
- * @author Michael Beck
- * @brief Lower Double word operations, ie Mode L -> I
- *
- * $Id$
+/*
+ * This file is part of libFirm.
+ * Copyright (C) 2012 University of Karlsruhe.
*/
-#ifndef _FIRM_LOWER_DW_H
-#define _FIRM_LOWER_DW_H
+/**
+ * @file
+ * @brief doubleword lowering operations
+ * @author Michael Beck, Matthias Braun
+ */
+#ifndef FIRM_LOWER_LOWER_DW_H
+#define FIRM_LOWER_LOWER_DW_H
#include "firm_types.h"
+/**
+ * Every double word node will be replaced,
+ * we need some store to hold the replacement:
+ */
+typedef struct lower64_entry_t {
+ ir_node *low_word; /**< the low word */
+ ir_node *high_word; /**< the high word */
+} lower64_entry_t;
+
+
/**
* A callback type for creating an intrinsic entity for a given opcode.
*
* @param context the context parameter
*/
typedef ir_entity *(create_intrinsic_fkt)(ir_type *method, const ir_op *op,
- const ir_mode *imode, const ir_mode *omode,
- void *context);
+ const ir_mode *imode,
+ const ir_mode *omode, void *context);
/**
* The lowering parameter description.
*/
-typedef struct _lwrdw_param_t {
- int enable; /**< if true lowering is enabled */
- int little_endian; /**< if true should be lowered for little endian, else big endian */
- ir_mode *high_signed; /**< the double word signed mode to be lowered, typically Ls */
- ir_mode *high_unsigned; /**< the double word unsigned mode to be lowered, typically Lu */
- ir_mode *low_signed; /**< the word signed mode to be used, typically Is */
- ir_mode *low_unsigned; /**< the word unsigned mode to be used, typically Iu */
-
- /** callback that creates the intrinsic entity */
- create_intrinsic_fkt *create_intrinsic;
- void *ctx; /**< context parameter for the creator function */
+typedef struct lwrdw_param_t {
+ unsigned little_endian : 1; /**< if true should be lowered for little endian, else big endian */
+ unsigned doubleword_size; /**< bitsize of the doubleword mode */
+ create_intrinsic_fkt *create_intrinsic; /**< callback that creates the intrinsic entity */
+ void *ctx; /**< context parameter for the creator function */
} lwrdw_param_t;
/**
- * Lower all double word operations.
+ * Prepare the doubleword lowering algorithm. Creates an environment
+ * which can be used to register custom lowering functions
+ */
+void ir_prepare_dw_lowering(const lwrdw_param_t *param);
+
+/**
+ * Lower all doubleword operations in the program.
+ * Must be called after ir_prepare_dw_lowering()
+ */
+void ir_lower_dw_ops(void);
+
+typedef void (*lower_dw_func)(ir_node *node, ir_mode *mode);
+
+/**
+ * register a custom lowering function.
+ * After lowering the custom function should call ir_set_dw_lowered()
+ */
+void ir_register_dw_lower_function(ir_op *op, lower_dw_func func);
+
+/**
+ * After lowering a node a custom doubleword lowering function has to call this.
+ * It registers 2 new values for the high and low part of the lowered value.
+ */
+void ir_set_dw_lowered(ir_node *old, ir_node *new_low,
+ ir_node *new_high);
+
+/**
+ * Query lowering results of a node. In a lowering callback you can use this
+ * on all predecessors of a node. The only exception are block and phi nodes.
+ * Their predecessors are not necessarily transformed yet.
+ */
+lower64_entry_t *get_node_entry(ir_node *node);
+
+static inline ir_node *get_lowered_low(ir_node *node)
+{
+ return get_node_entry(node)->low_word;
+}
+
+static inline ir_node *get_lowered_high(ir_node *node)
+{
+ return get_node_entry(node)->high_word;
+}
+
+/**
+ * Return the unsigned variant of the lowered mode
+ * Note: you must only call this during a dw_lowering (= in a lowering callback)
*/
-void lower_dw_ops(const lwrdw_param_t *param);
+ir_mode *ir_get_low_unsigned_mode(void);
/**
* Default implementation. Context is unused.
const ir_mode *imode, const ir_mode *omode,
void *context);
-#endif /* _FIRM_LOWER_DW_H */
+#endif
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