re PR tree-optimization/81945 (ICE in operator[], at vec.h:749)

	PR tree-optimization/81945
	* cfgloop.h (FOR_EACH_LOOP_FN): Use FN instead of hardcoding fn.
	* tree-cfg.c (move_sese_region_to_fn): If any of the loops moved
	to dest_cfun has orig_loop_num set, either remap it to the new
	loop number if the loop got moved too, or clear it.

	* gcc.dg/graphite/pr81945.c: New test.

From-SVN: r255438

gcc/ChangeLog

+2017-12-06  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/81945
+	* cfgloop.h (FOR_EACH_LOOP_FN): Use FN instead of hardcoding fn.
+	* tree-cfg.c (move_sese_region_to_fn): If any of the loops moved
+	to dest_cfun has orig_loop_num set, either remap it to the new
+	loop number if the loop got moved too, or clear it.
+
 2017-12-05  Steve Ellcey  <sellcey@cavium.com>
 
 	* config/aarch64/thunderx2-t99.md (thunderx2t99_branch): Add trap

gcc/cfgloop.h

@@ -766,7 +766,7 @@ loop_iterator::~loop_iterator ()
        (LOOP) = li.next ())
 
 #define FOR_EACH_LOOP_FN(FN, LOOP, FLAGS) \
-  for (loop_iterator li(fn, &(LOOP), FLAGS); \
+  for (loop_iterator li(FN, &(LOOP), FLAGS); \
        (LOOP); \
        (LOOP) = li.next ())
 

gcc/testsuite/ChangeLog

+2017-12-06  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/81945
+	* gcc.dg/graphite/pr81945.c: New test.
+
 2017-12-05  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>
 
 	* gcc.c-torture/unsorted/dump-noaddr.x: Generate dump files in

gcc/testsuite/gcc.dg/graphite/pr81945.c

+/* PR tree-optimization/81945 */
+/* { dg-do compile { target pthread } } */
+/* { dg-options "-O3 -ftree-parallelize-loops=2 -floop-nest-optimize" } */
+
+unsigned long int v;
+
+void
+foo (int x, int y, long int *a)
+{
+  do
+    {
+      int **b;
+
+      while (y != 0)
+        ;
+      v *= 2;
+      **b = *a;
+      ++x;
+    }
+  while (x < 1);
+}

gcc/tree-cfg.c

@@ -7468,6 +7468,8 @@ move_sese_region_to_fn (struct function *dest_cfun, basic_block entry_bb,
   loops->state = LOOPS_MAY_HAVE_MULTIPLE_LATCHES;
   set_loops_for_fn (dest_cfun, loops);
 
+  vec<loop_p, va_gc> *larray = get_loops (saved_cfun)->copy ();
+
   /* Move the outlined loop tree part.  */
   num_nodes = bbs.length ();
   FOR_EACH_VEC_ELT (bbs, i, bb)
@@ -7514,6 +7516,20 @@ move_sese_region_to_fn (struct function *dest_cfun, basic_block entry_bb,
   loop->aux = current_loops->tree_root;
   loop0->aux = current_loops->tree_root;
 
+  /* Fix up orig_loop_num.  If the block referenced in it has been moved
+     to dest_cfun, update orig_loop_num field, otherwise clear it.  */
+  struct loop *dloop;
+  FOR_EACH_LOOP_FN (dest_cfun, dloop, 0)
+    if (dloop->orig_loop_num)
+      {
+	if ((*larray)[dloop->orig_loop_num] != NULL
+	    && get_loop (saved_cfun, dloop->orig_loop_num) == NULL)
+	  dloop->orig_loop_num = (*larray)[dloop->orig_loop_num]->num;
+	else
+	  dloop->orig_loop_num = 0;
+      }
+  ggc_free (larray);
+
   pop_cfun ();
 
   /* Move blocks from BBS into DEST_CFUN.  */