re PR middle-end/46844 (regrename.c:312:22: error: unused parameter 'reg')

	PR middle-end/46844
	* regrename.c (check_new_reg_p): Add ATTRIBUTE_UNUSED to reg
	parameter.

From-SVN: r167596

gcc/ChangeLog

+2010-12-08  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/46844
+	* regrename.c (check_new_reg_p): Add ATTRIBUTE_UNUSED to reg
+	parameter.
+
 2010-12-08  Richard Earnshaw  <rearnsha@arm.com>
 
 	PR target/46631

gcc/regrename.c

@@ -309,8 +309,8 @@ sort_du_head (struct du_head **head)
    registers.  */
 
 static bool
-check_new_reg_p (int reg, int new_reg,  struct du_head *this_head,
-		 HARD_REG_SET this_unavailable)
+check_new_reg_p (int reg ATTRIBUTE_UNUSED, int new_reg,
+		 struct du_head *this_head, HARD_REG_SET this_unavailable)
 {
   enum machine_mode mode = GET_MODE (*this_head->first->loc);
   int nregs = hard_regno_nregs[new_reg][mode];