m68k.c (m68k_delegitimize_address): Don't do anything if the argument is not a MEM.

* config/m68k/m68k.c (m68k_delegitimize_address): Don't do
anything if the argument is not a MEM.

From-SVN: r160763

gcc/ChangeLog

+2010-06-14  Andreas Schwab  <schwab@linux-m68k.org>
+
+	* config/m68k/m68k.c (m68k_delegitimize_address): Don't do
+	anything if the argument is not a MEM.
+
 2010-06-14  Alexandre Oliva  <aoliva@redhat.com>
 
 	PR debug/43650

gcc/config/m68k/m68k.c

@@ -4624,16 +4624,17 @@ m68k_output_dwarf_dtprel (FILE *file, int size, rtx x)
    and turn them back into a direct symbol reference.  */
 
 static rtx
-m68k_delegitimize_address (rtx x)
+m68k_delegitimize_address (rtx orig_x)
 {
-  rtx orig_x = delegitimize_mem_from_attrs (x);
-  rtx y;
+  rtx x, y;
   rtx addend = NULL_RTX;
   rtx result;
 
-  x = orig_x;
-  if (MEM_P (x))
-    x = XEXP (x, 0);
+  orig_x = delegitimize_mem_from_attrs (orig_x);
+  if (! MEM_P (orig_x))
+    return orig_x;
+
+  x = XEXP (orig_x, 0);
 
   if (GET_CODE (x) == PLUS
       && GET_CODE (XEXP (x, 1)) == CONST