re PR tree-optimization/71168 (ICE in find_uses_to_rename_use (tree-ssa-loop-manip.c:379))

2016-05-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/71168
	* tree-loop-distribution.c (distribute_loop): Move *destroy_p
	initialization earlier.

	* gcc.dg/torture/pr71168.c: New testcase.

From-SVN: r236361

gcc/ChangeLog

+2016-05-18  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/71168
+	* tree-loop-distribution.c (distribute_loop): Move *destroy_p
+	initialization earlier.
+
 2016-05-18  James Greenhalgh  <james.greenhalgh@arm.com>
 
 	* config/aarch64/aarch64-simd.md

gcc/testsuite/ChangeLog

+2016-05-18  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/71168
+	* gcc.dg/torture/pr71168.c: New testcase.
+
 2016-05-17  Kugan Vivekanandarajah  <kuganv@linaro.org>
 
 	PR middle-end/63586

gcc/testsuite/gcc.dg/torture/pr71168.c

+/* { dg-do compile } */
+
+int a, b, c;
+long *d;
+void fn1()
+{
+  for (; 0 < a;)
+    a++;
+}
+void fn3()
+{
+  for (; c; c++)
+    d[c] = 0;
+}
+void fn2()
+{
+  if (b)
+    fn3();
+  fn1();
+}

gcc/tree-loop-distribution.c

@@ -1413,6 +1413,7 @@ distribute_loop (struct loop *loop, vec<gimple *> stmts,
   graph *pg = NULL;
   int num_sccs = 1;
 
+  *destroy_p = false;
   *nb_calls = 0;
   auto_vec<loop_p, 3> loop_nest;
   if (!find_loop_nest (loop, &loop_nest))
@@ -1647,7 +1648,6 @@ distribute_loop (struct loop *loop, vec<gimple *> stmts,
   if (dump_file && (dump_flags & TDF_DETAILS))
     dump_rdg_partitions (dump_file, partitions);
 
-  *destroy_p = false;
   FOR_EACH_VEC_ELT (partitions, i, partition)
     {
       if (partition_builtin_p (partition))