Fix gcc_assert in expand_omp_for_static_chunk

2015-09-03  Tom de Vries  <tom@codesourcery.com>

	PR tree-optimization/65637
	* omp-low.c (expand_omp_for_static_chunk): Fix gcc_assert for the case
	that head is NULL.

	* gcc.dg/autopar/pr46099-2.c: New test.

From-SVN: r227436

gcc/ChangeLog

 2015-09-03  Tom de Vries  <tom@codesourcery.com>
 
+	PR tree-optimization/65637
+	* omp-low.c (expand_omp_for_static_chunk): Fix gcc_assert for the case
+	that head is NULL.
+
+2015-09-03  Tom de Vries  <tom@codesourcery.com>
+
 	* omp-low.c (expand_omp_for_static_chunk): Handle simple latch bb.
 
 2015-09-03  Tom de Vries  <tom@codesourcery.com>

gcc/omp-low.c

@@ -7326,7 +7326,7 @@ expand_omp_for_static_chunk (struct omp_region *region,
 	  locus = redirect_edge_var_map_location (vm);
 	  add_phi_arg (nphi, redirect_edge_var_map_def (vm), re, locus);
 	}
-      gcc_assert (gsi_end_p (psi) && i == head->length ());
+      gcc_assert (gsi_end_p (psi) && (head == NULL || i == head->length ()));
       redirect_edge_var_map_clear (re);
       while (1)
 	{

gcc/testsuite/ChangeLog

+2015-09-03  Tom de Vries  <tom@codesourcery.com>
+
+	PR tree-optimization/65637
+	* gcc.dg/autopar/pr46099-2.c: New test.
+
 2015-09-03  Naveen H.S  <Naveen.Hurugalawadi@caviumnetworks.com>
 
 	PR middle-end/67351

gcc/testsuite/gcc.dg/autopar/pr46099-2.c

+/* PR tree-optimization/46099.  */
+/* { dg-do compile } */
+/* { dg-options "-ftree-parallelize-loops=2 -fcompare-debug -O --param parloops-chunk-size=100" } */
+
+#include "pr46099.c"