re PR target/40489 (gcc.dg/builtin-unreachable-3.c doesn't work on ia64)

2009-06-27  H.J. Lu  <hongjiu.lu@intel.com>

	PR target/40489
	* config/ia64/ia64.c (ia64_reorg): Check NULL insn.

From-SVN: r149014

gcc/config/ia64/ia64.c

@@ -9239,20 +9239,24 @@ ia64_reorg (void)
       insn = get_last_insn ();
       if (! INSN_P (insn))
         insn = prev_active_insn (insn);
-      /* Skip over insns that expand to nothing.  */
-      while (GET_CODE (insn) == INSN && get_attr_empty (insn) == EMPTY_YES)
-        {
-	  if (GET_CODE (PATTERN (insn)) == UNSPEC_VOLATILE
-	      && XINT (PATTERN (insn), 1) == UNSPECV_INSN_GROUP_BARRIER)
-	    saw_stop = 1;
-	  insn = prev_active_insn (insn);
-	}
-      if (GET_CODE (insn) == CALL_INSN)
+      if (insn)
 	{
-	  if (! saw_stop)
-	    emit_insn (gen_insn_group_barrier (GEN_INT (3)));
-	  emit_insn (gen_break_f ());
-	  emit_insn (gen_insn_group_barrier (GEN_INT (3)));
+	  /* Skip over insns that expand to nothing.  */
+	  while (GET_CODE (insn) == INSN
+		 && get_attr_empty (insn) == EMPTY_YES)
+	    {
+	      if (GET_CODE (PATTERN (insn)) == UNSPEC_VOLATILE
+		  && XINT (PATTERN (insn), 1) == UNSPECV_INSN_GROUP_BARRIER)
+		saw_stop = 1;
+	      insn = prev_active_insn (insn);
+	    }
+	  if (GET_CODE (insn) == CALL_INSN)
+	    {
+	      if (! saw_stop)
+		emit_insn (gen_insn_group_barrier (GEN_INT (3)));
+	      emit_insn (gen_break_f ());
+	      emit_insn (gen_insn_group_barrier (GEN_INT (3)));
+	    }
 	}
     }