[Committed] S/390: Handle GOTOFF unspecs in delegitimize_address

[Andreas Krebbel]

Hi,

the attached patch adds handling for GOTOFF unspecs to
delegitimize_address.

A lot of "note: non-delegitimized UNSPEC 112" messages disappear with
this.  However not all of them.

Committed to mainline.

Bye,

-Andreas-


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

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


Index: gcc/config/s390/s390.c
===================================================================
*** gcc/config/s390/s390.c.orig
--- gcc/config/s390/s390.c
*************** s390_delegitimize_address (rtx orig_x)
*** 5015,5020 ****
--- 5015,5037 ----
  
    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;