PRE_INC with invalid hard reg

	PR target/68973
	* reloads.c (find_reloads_address_1): For pre/post-inc/dec
	with an invalid hard reg, reload just the reg not the entire
	pre/post-inc/dec address expression.

From-SVN: r233406

gcc/ChangeLog

+2016-02-14  Alan Modra  <amodra@gmail.com>
+
+	PR target/68973
+	* reloads.c (find_reloads_address_1): For pre/post-inc/dec
+	with an invalid hard reg, reload just the reg not the entire
+	pre/post-inc/dec address expression.
+
 2016-02-13  Oleg Endo  <olegendo@gcc.gnu.org>
 
 	PR target/67260

gcc/reload.c

@@ -5834,14 +5834,16 @@ find_reloads_address_1 (machine_mode mode, addr_space_t as,
 			   ? XEXP (x, 0)
 			   : reg_equiv_mem (regno));
 	      enum insn_code icode = optab_handler (add_optab, GET_MODE (x));
-	      if (insn && NONJUMP_INSN_P (insn) && equiv
-		  && memory_operand (equiv, GET_MODE (equiv))
+	      if (insn && NONJUMP_INSN_P (insn)
 #if HAVE_cc0
 		  && ! sets_cc0_p (PATTERN (insn))
 #endif
-		  && ! (icode != CODE_FOR_nothing
-			&& insn_operand_matches (icode, 0, equiv)
-			&& insn_operand_matches (icode, 1, equiv))
+		  && (regno < FIRST_PSEUDO_REGISTER
+		      || (equiv
+			  && memory_operand (equiv, GET_MODE (equiv))
+			  && ! (icode != CODE_FOR_nothing
+				&& insn_operand_matches (icode, 0, equiv)
+				&& insn_operand_matches (icode, 1, equiv))))
 		  /* Using RELOAD_OTHER means we emit this and the reload we
 		     made earlier in the wrong order.  */
 		  && !reloaded_inner_of_autoinc)