m68k.c (split_di): New.

	* config/m68k/m68k.c (split_di): New.
	* config/m68k/m68k-protos.h: Declare split_di.
	* config/m68k/m68k.md (extendsidi2*,ashldi3*,ashrdi3*,lshrdi3*):
	  Improve predicate handling and split constant shifts.

From-SVN: r122084

gcc/ChangeLog

 2007-02-18  Roman Zippel <zippel@linux-m68k.org>
 
+	* config/m68k/m68k.c (split_di): New.
+	* config/m68k/m68k-protos.h: Declare split_di.
+	* config/m68k/m68k.md (extendsidi2*,ashldi3*,ashrdi3*,lshrdi3*):
+	  Improve predicate handling and split constant shifts.
+
+2007-02-18  Roman Zippel <zippel@linux-m68k.org>
+
 	* config/m68k/m68k.md (extv,extzv,insv): disable dynamic
 	parameter for register bitfield operations, general predicates
 	cleanup

gcc/config/m68k/m68k-protos.h

@@ -22,6 +22,9 @@ Boston, MA 02110-1301, USA.  */
 
 #ifdef RTX_CODE
 extern HOST_WIDE_INT m68k_initial_elimination_offset (int from, int to);
+
+extern void split_di (rtx[], int, rtx[], rtx[]);
+
 extern bool valid_mov3q_const (HOST_WIDE_INT);
 extern const char *output_move_simode (rtx *);
 extern const char *output_move_himode (rtx *);

gcc/config/m68k/m68k.c

@@ -2722,6 +2722,38 @@ emit_move_sequence (rtx *operands, enum machine_mode mode, rtx scratch_reg)
   return 0;
 }
 
+/* Split one or more DImode RTL references into pairs of SImode
+   references.  The RTL can be REG, offsettable MEM, integer constant, or
+   CONST_DOUBLE.  "operands" is a pointer to an array of DImode RTL to
+   split and "num" is its length.  lo_half and hi_half are output arrays
+   that parallel "operands".  */
+
+void
+split_di (rtx operands[], int num, rtx lo_half[], rtx hi_half[])
+{
+  while (num--)
+    {
+      rtx op = operands[num];
+
+      /* simplify_subreg refuses to split volatile memory addresses,
+	 but we still have to handle it.  */
+      if (GET_CODE (op) == MEM)
+	{
+	  lo_half[num] = adjust_address (op, SImode, 4);
+	  hi_half[num] = adjust_address (op, SImode, 0);
+	}
+      else
+	{
+	  lo_half[num] = simplify_gen_subreg (SImode, op,
+					      GET_MODE (op) == VOIDmode
+					      ? DImode : GET_MODE (op), 4);
+	  hi_half[num] = simplify_gen_subreg (SImode, op,
+					      GET_MODE (op) == VOIDmode
+					      ? DImode : GET_MODE (op), 0);
+	}
+    }
+}
+
 /* Return a REG that occurs in ADDR with coefficient 1.
    ADDR can be effectively incremented by incrementing REG.  */