function.c: Use rtx_sequence

gcc/
2014-08-27  David Malcolm  <dmalcolm@redhat.com>

	* function.c (contains): Introduce local "seq" for PATTERN (insn),
	with a checked cast, in the region for where we know it's a
	SEQUENCE.  Use methods of rtx_sequence.

From-SVN: r214595

gcc/ChangeLog

 2014-08-27  David Malcolm  <dmalcolm@redhat.com>
 
+	* function.c (contains): Introduce local "seq" for PATTERN (insn),
+	with a checked cast, in the region for where we know it's a
+	SEQUENCE.  Use methods of rtx_sequence.
+
+2014-08-27  David Malcolm  <dmalcolm@redhat.com>
+
 	* final.c (get_attr_length_1): Replace GET_CODE check with a
 	dyn_cast, introducing local "seq" and the use of methods of
 	rtx_sequence.

gcc/function.c

@@ -5335,9 +5335,10 @@ contains (const_rtx insn, htab_t hash)
 
   if (NONJUMP_INSN_P (insn) && GET_CODE (PATTERN (insn)) == SEQUENCE)
     {
+      rtx_sequence *seq = as_a <rtx_sequence *> (PATTERN (insn));
       int i;
-      for (i = XVECLEN (PATTERN (insn), 0) - 1; i >= 0; i--)
-	if (htab_find (hash, XVECEXP (PATTERN (insn), 0, i)))
+      for (i = seq->len () - 1; i >= 0; i--)
+	if (htab_find (hash, seq->element (i)))
 	  return true;
       return false;
     }