2013-04-26 Richard Biener <rguenther@suse.de>

	* Makefile.in (lto-streamer-in.o): Add $(CFGLOOP_H) dependency.
	(lto-streamer-out.o): Likewise.
	* cfgloop.c (init_loops_structure): Export, add struct function
	argument and adjust.
	(flow_loops_find): Adjust.
	* cfgloop.h (enum loop_estimation): Add EST_LAST.
	(init_loops_structure): Declare.
	* lto-streamer-in.c: Include cfgloop.h.
	(input_cfg): Input the loop tree.
	* lto-streamer-out.c: Include cfgloop.h.
	(output_cfg): Output the loop tree.
	(output_struct_function_base): Do not drop PROP_loops.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@198334 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 54 insertions, 0 deletions

diff --git a/gcc/lto-streamer-in.c b/gcc/lto-streamer-in.c
index c4daa30c581..f5789c01277 100644
--- a/gcc/lto-streamer-in.c
+++ b/gcc/lto-streamer-in.c
@@ -48,6 +48,8 @@ along with GCC; see the file COPYING3.  If not see
 #include "tree-streamer.h"
 #include "tree-pass.h"
 #include "streamer-hooks.h"
+#include "cfgloop.h"
+
 
 struct freeing_string_slot_hasher : string_slot_hasher
 {
@@ -660,6 +662,58 @@ input_cfg (struct lto_input_block *ib, struct function *fn,
       p_bb = bb;
       index = streamer_read_hwi (ib);
     }
+
+  /* ???  The cfgloop interface is tied to cfun.  */
+  gcc_assert (cfun == fn);
+
+  /* Input the loop tree.  */
+  unsigned n_loops = streamer_read_uhwi (ib);
+  if (n_loops == 0)
+    return;
+
+  struct loops *loops = ggc_alloc_cleared_loops ();
+  init_loops_structure (fn, loops, n_loops);
+
+  /* Input each loop and associate it with its loop header so
+     flow_loops_find can rebuild the loop tree.  */
+  for (unsigned i = 1; i < n_loops; ++i)
+    {
+      int header_index = streamer_read_hwi (ib);
+      if (header_index == -1)
+	{
+	  loops->larray->quick_push (NULL);
+	  continue;
+	}
+
+      struct loop *loop = alloc_loop ();
+      loop->num = loops->larray->length ();
+      loop->header = BASIC_BLOCK_FOR_FUNCTION (fn, header_index);
+      loop->header->loop_father = loop;
+
+      /* Read everything copy_loop_info copies.  */
+      loop->estimate_state = streamer_read_enum (ib, loop_estimation, EST_LAST);
+      loop->any_upper_bound = streamer_read_hwi (ib);
+      if (loop->any_upper_bound)
+	{
+	  loop->nb_iterations_upper_bound.low = streamer_read_uhwi (ib);
+	  loop->nb_iterations_upper_bound.high = streamer_read_hwi (ib);
+	}
+      loop->any_estimate = streamer_read_hwi (ib);
+      if (loop->any_estimate)
+	{
+	  loop->nb_iterations_estimate.low = streamer_read_uhwi (ib);
+	  loop->nb_iterations_estimate.high = streamer_read_hwi (ib);
+	}
+
+      loops->larray->quick_push (loop);
+
+      /* flow_loops_find doesn't like loops not in the tree, hook them
+         all as siblings of the tree root temporarily.  */
+      flow_loop_tree_node_add (loops->tree_root, loop);
+    }
+
+  /* Rebuild the loop tree.  */
+  fn->x_current_loops = flow_loops_find (loops);
 }