initial implementation of DOUBLE-WORD lowering, cannot handle conversions from/to

floating point yet.

[r7664]

ir/lower/Makefile.in

@@ -15,12 +15,12 @@ srcdir = @srcdir@
 topdir = ../..
 subdir := ir/lower
 
-INSTALL_HEADERS = lower_intrinsics.h lower_calls.h
+INSTALL_HEADERS = lower_intrinsics.h lower_calls.h lower_dw.h
 
 SOURCES = $(INSTALL_HEADERS)
 
 SOURCES += 	Makefile.in \
-		lower_intrinsics.c lower_calls.c
+		lower_intrinsics.c lower_calls.c lower_dw.c
 
 include $(topdir)/MakeRules
 

ir/lower/lower_dw.h

+/**
+ * @file irlwrdw.h
+ * @date 8.10.2004
+ * @author Michael Beck
+ * @brief Lower Double word operations, ie Mode L -> I
+ *
+ * $Id$
+ */
+
+#ifndef _FIRM_LOWER_DW_H
+#define _FIRM_LOWER_DW_H
+
+#include "firm_types.h"
+
+/**
+ * A callback type for creating an intrinsic entity for a given opcode. */
+typedef entity *(create_intrinsic_fkt)(ir_type *method, const ir_op *op, const ir_mode *mode, void *context);
+
+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 */
+} lwrdw_param_t;
+
+/**
+ * Lower all double word operations.
+ */
+void lower_dw_ops(const lwrdw_param_t *param);
+
+/**
+ * Default implementation.
+ */
+entity *def_create_intrinsic_fkt(ir_type *method, const ir_op *op, const ir_mode *mode, void *context);
+
+#endif /* _FIRM_LOWER_DW_H */