re PR tree-optimization/89268 (r268689 caused FAIL: gcc.dg/vect/pr79887.c)

	PR tree-optimization/89268
	* tree-if-conv.c (version_loop_for_if_conversion): Push to preds only
	if preds is non-NULL.

	* gcc.dg/vect/pr89268.c: New test.

From-SVN: r268743

gcc/ChangeLog

+2019-02-10  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/89268
+	* tree-if-conv.c (version_loop_for_if_conversion): Push to preds only
+	if preds is non-NULL.
+
 2019-02-09  Jan Hubicka  <hubicka@ucw.cz>
 
 	PR lto/89272

gcc/testsuite/ChangeLog

+2019-02-10  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/89268
+	* gcc.dg/vect/pr89268.c: New test.
+
 2019-02-10  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* gnat.dg/lto19.adb: Remove dg-excess-errors.

gcc/testsuite/gcc.dg/vect/pr89268.c

+/* PR tree-optimization/89268 */
+/* { dg-do compile } */
+/* { dg-require-effective-target vect_condition } */
+/* { dg-additional-options "-fno-trapping-math --param vect-epilogues-nomask=1" } */
+/* { dg-additional-options "-mavx512ifma -mtune=intel" { target x86_64-*-* i?86-*-* } } */
+
+#include "pr79887.c"

gcc/tree-if-conv.c

@@ -2760,7 +2760,8 @@ version_loop_for_if_conversion (struct loop *loop, vec<gimple *> *preds)
   new_loop->force_vectorize = false;
   gsi = gsi_last_bb (cond_bb);
   gimple_call_set_arg (g, 1, build_int_cst (integer_type_node, new_loop->num));
-  preds->safe_push (g);
+  if (preds)
+    preds->safe_push (g);
   gsi_insert_before (&gsi, g, GSI_SAME_STMT);
   update_ssa (TODO_update_ssa);
   return new_loop;