Make ranger optional in path_range_query.

All users of path_range_query are currently allocating a gimple_ranger
only to pass it to the query object.  It's tidier to just do it from
path_range_query if no ranger was passed.

Tested on x86-64 Linux.

gcc/ChangeLog:

	* gimple-range-path.cc (path_range_query::path_range_query): New
	ctor without a ranger.
	(path_range_query::~path_range_query): Free ranger if necessary.
	(path_range_query::range_on_path_entry): Adjust m_ranger for pointer.
	(path_range_query::ssa_range_in_phi): Same.
	(path_range_query::compute_ranges_in_block): Same.
	(path_range_query::compute_imports): Same.
	(path_range_query::compute_ranges): Same.
	(path_range_query::range_of_stmt): Same.
	(path_range_query::compute_outgoing_relations): Same.
	* gimple-range-path.h (class path_range_query): New ctor.
	* tree-ssa-loop-ch.c (ch_base::copy_headers): Remove gimple_ranger
	as path_range_query allocates one.
	* tree-ssa-threadbackward.c (class back_threader): Remove m_ranger.
	(back_threader::~back_threader): Same.

4 files changed, 37 insertions, 24 deletions

diff --git a/gcc/gimple-range-path.cc b/gcc/gimple-range-path.cc
index 4843c13..b9aceaf 100644
--- a/gcc/gimple-range-path.cc
+++ b/gcc/gimple-range-path.cc
@@ -36,13 +36,24 @@ along with GCC; see the file COPYING3.  If not see
 // Internal construct to help facilitate debugging of solver.
 #define DEBUG_SOLVER (dump_file && (param_threader_debug == THREADER_DEBUG_ALL))
 
-path_range_query::path_range_query (gimple_ranger &ranger, bool resolve)
-  : m_ranger (ranger)
+path_range_query::path_range_query (gimple_ranger *ranger, bool resolve)
+  : m_cache (new ssa_global_cache),
+    m_has_cache_entry (BITMAP_ALLOC (NULL)),
+    m_ranger (ranger),
+    m_resolve (resolve),
+    m_alloced_ranger (false)
 {
-  m_cache = new ssa_global_cache;
-  m_has_cache_entry = BITMAP_ALLOC (NULL);
-  m_resolve = resolve;
-  m_oracle = new path_oracle (ranger.oracle ());
+  m_oracle = new path_oracle (ranger->oracle ());
+}
+
+path_range_query::path_range_query (bool resolve)
+  : m_cache (new ssa_global_cache),
+    m_has_cache_entry (BITMAP_ALLOC (NULL)),
+    m_ranger (new gimple_ranger),
+    m_resolve (resolve),
+    m_alloced_ranger (true)
+{
+  m_oracle = new path_oracle (m_ranger->oracle ());
 }
 
 path_range_query::~path_range_query ()
@@ -50,6 +61,8 @@ path_range_query::~path_range_query ()
   BITMAP_FREE (m_has_cache_entry);
   delete m_cache;
   delete m_oracle;
+  if (m_alloced_ranger)
+    delete m_ranger;
 }
 
 // Mark cache entry for NAME as unused.
@@ -140,7 +153,7 @@ path_range_query::range_on_path_entry (irange &r, tree name)
   gimple *last = last_stmt (entry);
   if (last)
     {
-      if (m_ranger.range_of_expr (r, name, last))
+      if (m_ranger->range_of_expr (r, name, last))
 	return;
       gcc_unreachable ();
     }
@@ -156,7 +169,7 @@ path_range_query::range_on_path_entry (irange &r, tree name)
     {
       edge e = EDGE_PRED (entry, i);
       if (e->src != ENTRY_BLOCK_PTR_FOR_FN (cfun)
-	  && m_ranger.range_on_edge (tmp, e, name))
+	  && m_ranger->range_on_edge (tmp, e, name))
 	{
 	  r.union_ (tmp);
 	  changed = true;
@@ -244,7 +257,7 @@ path_range_query::ssa_range_in_phi (irange &r, gphi *phi)
 
   if (at_entry ())
     {
-      if (m_resolve && m_ranger.range_of_expr (r, name, phi))
+      if (m_resolve && m_ranger->range_of_expr (r, name, phi))
 	return;
 
       // Try fold just in case we can resolve simple things like PHI <5(99), 6(88)>.
@@ -275,7 +288,7 @@ path_range_query::ssa_range_in_phi (irange &r, gphi *phi)
 		  range_on_path_entry (r, arg);
 		else
 		  r.set_varying (TREE_TYPE (name));
-		m_ranger.range_on_edge (tmp, e_in, arg);
+		m_ranger->range_on_edge (tmp, e_in, arg);
 		r.intersect (tmp);
 		return;
 	      }
@@ -370,7 +383,7 @@ path_range_query::compute_ranges_in_block (basic_block bb)
   EXECUTE_IF_SET_IN_BITMAP (m_imports, 0, i, bi)
     {
       tree name = ssa_name (i);
-      gori_compute &g = m_ranger.gori ();
+      gori_compute &g = m_ranger->gori ();
       bitmap exports = g.exports (bb);
 
       if (bitmap_bit_p (exports, i))
@@ -452,7 +465,7 @@ void
 path_range_query::compute_imports (bitmap imports, basic_block exit)
 {
   // Start with the imports from the exit block...
-  bitmap r_imports = m_ranger.gori ().imports (exit);
+  bitmap r_imports = m_ranger->gori ().imports (exit);
   bitmap_copy (imports, r_imports);
 
   auto_vec<tree> worklist (bitmap_count_bits (imports));
@@ -539,7 +552,7 @@ path_range_query::compute_ranges (const vec<basic_block> &path,
 
       if (m_resolve)
 	{
-	  gori_compute &gori = m_ranger.gori ();
+	  gori_compute &gori = m_ranger->gori ();
 	  tree name;
 
 	  // Exported booleans along the path, may help conditionals.
@@ -659,7 +672,7 @@ path_range_query::range_of_stmt (irange &r, gimple *stmt, tree)
   if (m_resolve)
     {
       fold_using_range f;
-      jt_fur_source src (stmt, this, &m_ranger.gori (), m_path);
+      jt_fur_source src (stmt, this, &m_ranger->gori (), m_path);
       if (!f.fold_stmt (r, stmt, src))
 	r.set_varying (type);
     }
@@ -750,7 +763,7 @@ path_range_query::compute_outgoing_relations (basic_block bb, basic_block next)
       else
 	gcc_unreachable ();
 
-      jt_fur_source src (NULL, this, &m_ranger.gori (), m_path);
+      jt_fur_source src (NULL, this, &m_ranger->gori (), m_path);
       src.register_outgoing_edges (cond, r, e0, e1);
     }
 }
diff --git a/gcc/gimple-range-path.h b/gcc/gimple-range-path.h
index b5a0543..ea4864d 100644
--- a/gcc/gimple-range-path.h
+++ b/gcc/gimple-range-path.h
@@ -32,7 +32,8 @@ along with GCC; see the file COPYING3.  If not see
 class path_range_query : public range_query
 {
 public:
-  path_range_query (class gimple_ranger &ranger, bool resolve);
+  path_range_query (class gimple_ranger *ranger, bool resolve = true);
+  path_range_query (bool resolve = true);
   virtual ~path_range_query ();
   void compute_ranges (const vec<basic_block> &, const bitmap_head *imports = NULL);
   void compute_ranges (edge e);
@@ -86,7 +87,7 @@ private:
   auto_vec<basic_block> m_path;
 
   auto_bitmap m_imports;
-  gimple_ranger &m_ranger;
+  gimple_ranger *m_ranger;
   non_null_ref m_non_null;
 
   // Current path position.
@@ -97,6 +98,10 @@ private:
 
   // Set if there were any undefined expressions while pre-calculating path.
   bool m_undefined_path;
+
+  // True if m_ranger was allocated in this class and must be freed at
+  // destruction.
+  bool m_alloced_ranger;
 };
 
 // Return TRUE if NAME is in the import bitmap.
diff --git a/gcc/tree-ssa-loop-ch.c b/gcc/tree-ssa-loop-ch.c
index b87361c..566cc27 100644
--- a/gcc/tree-ssa-loop-ch.c
+++ b/gcc/tree-ssa-loop-ch.c
@@ -384,8 +384,7 @@ ch_base::copy_headers (function *fun)
   auto_vec<loop_p> candidates;
   auto_vec<std::pair<edge, loop_p> > copied;
 
-  gimple_ranger *ranger = new gimple_ranger;
-  path_range_query *query = new path_range_query (*ranger, /*resolve=*/true);
+  path_range_query *query = new path_range_query;
   for (auto loop : loops_list (cfun, 0))
     {
       int initial_limit = param_max_loop_header_insns;
@@ -423,7 +422,6 @@ ch_base::copy_headers (function *fun)
     }
   /* Do not use ranger after we change the IL and not have updated SSA.  */
   delete query;
-  delete ranger;
 
   for (auto loop : candidates)
     {
diff --git a/gcc/tree-ssa-threadbackward.c b/gcc/tree-ssa-threadbackward.c
index 61aee25..71989c2 100644
--- a/gcc/tree-ssa-threadbackward.c
+++ b/gcc/tree-ssa-threadbackward.c
@@ -100,7 +100,6 @@ private:
 
   back_threader_registry m_registry;
   back_threader_profitability m_profit;
-  gimple_ranger *m_ranger;
   path_range_query *m_solver;
 
   // Current path being analyzed.
@@ -143,15 +142,13 @@ back_threader::back_threader (function *fun, unsigned flags, bool first)
 
   m_fun = fun;
   m_flags = flags;
-  m_ranger = new gimple_ranger;
-  m_solver = new path_range_query (*m_ranger, flags & BT_RESOLVE);
+  m_solver = new path_range_query (flags & BT_RESOLVE);
   m_last_stmt = NULL;
 }
 
 back_threader::~back_threader ()
 {
   delete m_solver;
-  delete m_ranger;
 
   loop_optimizer_finalize ();
 }