re PR target/36336 (ICE push_reload - psuedo reg_equiv_constant)

PR target/36336
* config/avr/avr.h (LEGITIMIZE_RELOAD_ADDRESS): Add check for reg_equiv_constant.

From-SVN: r136818

gcc/ChangeLog

+2008-06-015  Andy Hutchinson  <hutchinsonandy@aim.com>
+
+	PR target/36336
+	* config/avr/avr.h (LEGITIMIZE_RELOAD_ADDRESS): Add check for 
+	reg_equiv_constant.
+
 2008-06-15  Maxim Kuvyrkov  <maxim@codesourcery.com>
 
 	* config/mips/loongson2ef.md: New file.

gcc/config/avr/avr.h

@@ -437,6 +437,11 @@ extern int avr_reg_order[];
 }
 
 #define XEXP_(X,Y) (X)
+
+/* LEGITIMIZE_RELOAD_ADDRESS will allow register R26/27 to be used, where it
+   is no worse than normal base pointers R28/29 and R30/31. For example:
+   If base offset is greater than 63 bytes or for R++ or --R addressing.  */
+   
 #define LEGITIMIZE_RELOAD_ADDRESS(X, MODE, OPNUM, TYPE, IND_LEVELS, WIN)    \
 do {									    \
   if (1&&(GET_CODE (X) == POST_INC || GET_CODE (X) == PRE_DEC))	    \
@@ -448,6 +453,7 @@ do {									    \
     }									    \
   if (GET_CODE (X) == PLUS						    \
       && REG_P (XEXP (X, 0))						    \
+      && reg_equiv_constant[REGNO (XEXP (X, 0))] == 0			    \
       && GET_CODE (XEXP (X, 1)) == CONST_INT				    \
       && INTVAL (XEXP (X, 1)) >= 1)					    \
     {									    \