More Ranger cache tweaks

This patch splits the individual value propagation out from fill_block_cache,
and calls it from set_global_value when the global value is updated.
This ensures the "current" global value is reflected in the on-entry cache.

	* gimple-range-cache.cc (ssa_global_cache::get_global_range): Return
	true if there was a previous range set.
	(ranger_cache::ranger_cache): Take a gimple_ranger parameter.
	(ranger_cache::set_global_range): Propagate the value if updating.
	(ranger_cache::propagate_cache): Renamed from iterative_cache_update.
	(ranger_cache::propagate_updated_value): New.  Split from:
	(ranger_cache::fill_block_cache): Split out value propagator.
	* gimple-range-cache.h (ssa_global_cache): Update prototypes.
	(ranger_cache): Update prototypes.

1 files changed, 6 insertions, 4 deletions

diff --git a/gcc/gimple-range-cache.h b/gcc/gimple-range-cache.h
index 599a292..0e84ab0 100644
--- a/gcc/gimple-range-cache.h
+++ b/gcc/gimple-range-cache.h
@@ -74,7 +74,7 @@ public:
   ssa_global_cache ();
   ~ssa_global_cache ();
   bool get_global_range (irange &r, tree name) const;
-  void set_global_range (tree name, const irange &r);
+  bool set_global_range (tree name, const irange &r);
   void clear_global_range (tree name);
   void clear ();
   void dump (FILE *f = stderr);
@@ -90,7 +90,7 @@ private:
 class ranger_cache : public gori_compute_cache
 {
 public:
-  ranger_cache (class range_query &q);
+  ranger_cache (class gimple_ranger &q);
   ~ranger_cache ();
 
   virtual void ssa_range_in_bb (irange &r, tree name, basic_block bb);
@@ -108,7 +108,9 @@ private:
   block_range_cache m_on_entry;
   void add_to_update (basic_block bb);
   void fill_block_cache (tree name, basic_block bb, basic_block def_bb);
-  void iterative_cache_update (tree name);
+  void propagate_cache (tree name);
+
+  void propagate_updated_value (tree name, basic_block bb);
 
   vec<basic_block> m_workback;
   vec<basic_block> m_update_list;
@@ -121,7 +123,7 @@ private:
   };
   bool push_poor_value (basic_block bb, tree name);
   vec<update_record> m_poor_value_list;
-  class range_query &query;
+  class gimple_ranger &query;
 };
 
 #endif // GCC_SSA_RANGE_CACHE_H