s390.c (s390_delegitimize_address): Handle GOTOFF unspecs.

2011-03-18  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	* config/s390/s390.c (s390_delegitimize_address): Handle GOTOFF
	unspecs.

From-SVN: r171157

gcc/ChangeLog

 2011-03-18  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
 
+	* config/s390/s390.c (s390_delegitimize_address): Handle GOTOFF
+	unspecs.
+
+2011-03-18  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
+
 	* config/s390/s390.c (s390_chunkify_start): Prevent literal pool
 	splitting between a call and its corresponding CALL_ARG_LOCATION
 	note.

gcc/config/s390/s390.c

@@ -5015,6 +5015,23 @@ s390_delegitimize_address (rtx orig_x)
 
   orig_x = delegitimize_mem_from_attrs (orig_x);
   x = orig_x;
+
+  /* Extract the symbol ref from:
+     (plus:SI (reg:SI 12 %r12)
+              (const:SI (unspec:SI [(symbol_ref/f:SI ("*.LC0"))]
+	                            UNSPEC_GOTOFF)))  */
+  if (GET_CODE (x) == PLUS
+      && REG_P (XEXP (x, 0))
+      && REGNO (XEXP (x, 0)) == PIC_OFFSET_TABLE_REGNUM
+      && GET_CODE (XEXP (x, 1)) == CONST)
+    {
+      /* The const operand.  */
+      y = XEXP (XEXP (x, 1), 0);
+      if (GET_CODE (y) == UNSPEC
+	  && XINT (y, 1) == UNSPEC_GOTOFF)
+	return XVECEXP (y, 0, 0);
+    }
+
   if (GET_CODE (x) != MEM)
     return orig_x;