[haifa-sched] PR rtl-optimization/68236: Exit early from autoprefetcher…

[haifa-sched] PR rtl-optimization/68236: Exit early from autoprefetcher lookahead if not in haifa sched

	PR rtl-optimization/68236
	* haifa-sched.c (autopref_multipass_dfa_lookahead_guard): Return 0
	if insn_queue doesn't exist.
	(haifa_sched_finish): Reset insn_queue to NULL.

From-SVN: r230088

gcc/ChangeLog

+2015-11-10  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	PR rtl-optimization/68236
+	* haifa-sched.c (autopref_multipass_dfa_lookahead_guard): Return 0
+	if insn_queue doesn't exist.
+	(haifa_sched_finish): Reset insn_queue to NULL.
+
 2015-11-10  Robert Suchanek  <robert.suchanek@imgtec.com>
 
 	* regrename.c (create_new_chain): Initialize renamed and tied_chain.

gcc/haifa-sched.c

@@ -5803,7 +5803,10 @@ autopref_multipass_dfa_lookahead_guard (rtx_insn *insn1, int ready_index)
 {
   int r = 0;
 
-  if (PARAM_VALUE (PARAM_SCHED_AUTOPREF_QUEUE_DEPTH) <= 0)
+  /* Exit early if the param forbids this or if we're not entering here through
+     normal haifa scheduling.  This can happen if selective scheduling is
+     explicitly enabled.  */
+  if (!insn_queue || PARAM_VALUE (PARAM_SCHED_AUTOPREF_QUEUE_DEPTH) <= 0)
     return 0;
 
   if (sched_verbose >= 2 && ready_index == 0)
@@ -7477,6 +7480,7 @@ haifa_sched_finish (void)
   sched_deps_finish ();
   sched_finish_luids ();
   current_sched_info = NULL;
+  insn_queue = NULL;
   sched_finish ();
 }