re PR tree-optimization/88044 (gfortran.dg/transfer_intrinsic_3.f90 hangs after r266171)

	PR tree-optimization/88044
	* tree-ssa-loop-niter.c (number_of_iterations_cond): If condition
	is false in the first iteration, but !every_iteration, return false
	instead of true with niter->niter zero.

From-SVN: r268143

gcc/ChangeLog

 2019-01-22  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/88044
+	* tree-ssa-loop-niter.c (number_of_iterations_cond): If condition
+	is false in the first iteration, but !every_iteration, return false
+	instead of true with niter->niter zero.
+
 	PR rtl-optimization/88904
 	* cfgcleanup.c (thread_jump): Verify cond2 doesn't mention
 	any nonequal registers before processing BB_END (b).

gcc/tree-ssa-loop-niter.c

@@ -1824,6 +1824,8 @@ number_of_iterations_cond (struct loop *loop,
   tree tem = fold_binary (code, boolean_type_node, iv0->base, iv1->base);
   if (tem && integer_zerop (tem))
     {
+      if (!every_iteration)
+	return false;
       niter->niter = build_int_cst (unsigned_type_for (type), 0);
       niter->max = 0;
       return true;