tree.h (VAR_DECL_IS_VIRTUAL_OPERAND): New.

2012-05-22  Richard Guenther  <rguenther@suse.de>

	* tree.h (VAR_DECL_IS_VIRTUAL_OPERAND): New.
	(init_function_for_compilation): Remove.
	* tree-dfa.c (find_vars_r): Take struct function argument.
	(find_referenced_vars_in): Adjust.
	* tree-ssa-operands.c (clobber_stats): Remove.
	(create_vop_var): Take struct function argument.  Mark
	virtual operand with VAR_DECL_IS_VIRTUAL_OPERAND.
	(init_ssa_operands): Take struct function argument.
	(fini_ssa_operands): Do not dump dead stats.
	* tree-ssa-operands.h (init_ssa_operands): Take struct function
	argument.
	* cgraphunit.c (init_lowered_empty_function): Adjust.
	* lto-streamer-in.c (input_cfg): Likewise.
	* tree-inline.c (initialize_cfun): Likewise.
	* tree-into-ssa.c (rewrite_into_ssa): Likewise.
	* omp-low.c (expand_omp_taskreg): Likewise.  Avoid switching
	cfun.
	* gimple.c (is_gimple_reg): Optimize the SSA_NAME case,
	virtual operands are not registers.

From-SVN: r187772

11 files changed, 66 insertions, 74 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4714c31..b76a522 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,27 @@
 2012-05-22  Richard Guenther  <rguenther@suse.de>
 
+	* tree.h (VAR_DECL_IS_VIRTUAL_OPERAND): New.
+	(init_function_for_compilation): Remove.
+	* tree-dfa.c (find_vars_r): Take struct function argument.
+	(find_referenced_vars_in): Adjust.
+	* tree-ssa-operands.c (clobber_stats): Remove.
+	(create_vop_var): Take struct function argument.  Mark
+	virtual operand with VAR_DECL_IS_VIRTUAL_OPERAND.
+	(init_ssa_operands): Take struct function argument.
+	(fini_ssa_operands): Do not dump dead stats.
+	* tree-ssa-operands.h (init_ssa_operands): Take struct function
+	argument.
+	* cgraphunit.c (init_lowered_empty_function): Adjust.
+	* lto-streamer-in.c (input_cfg): Likewise.
+	* tree-inline.c (initialize_cfun): Likewise.
+	* tree-into-ssa.c (rewrite_into_ssa): Likewise.
+	* omp-low.c (expand_omp_taskreg): Likewise.  Avoid switching
+	cfun.
+	* gimple.c (is_gimple_reg): Optimize the SSA_NAME case,
+	virtual operands are not registers.
+
+2012-05-22  Richard Guenther  <rguenther@suse.de>
+
 	* tree-cfg.c (verify_gimple_assign_unary): Fix typo in previous
 	commit.
 
diff --git a/gcc/cgraphunit.c b/gcc/cgraphunit.c
index e3416c6..2833868 100644
--- a/gcc/cgraphunit.c
+++ b/gcc/cgraphunit.c
@@ -1211,7 +1211,7 @@ init_lowered_empty_function (tree decl)
   gimple_register_cfg_hooks ();
   init_empty_tree_cfg ();
   init_tree_ssa (cfun);
-  init_ssa_operands ();
+  init_ssa_operands (cfun);
   cfun->gimple_df->in_ssa_p = true;
   DECL_INITIAL (decl) = make_node (BLOCK);
 
diff --git a/gcc/gimple.c b/gcc/gimple.c
index 4fc8362..bb02864 100644
--- a/gcc/gimple.c
+++ b/gcc/gimple.c
@@ -2786,7 +2786,17 @@ bool
 is_gimple_reg (tree t)
 {
   if (TREE_CODE (t) == SSA_NAME)
-    t = SSA_NAME_VAR (t);
+    {
+      t = SSA_NAME_VAR (t);
+      if (TREE_CODE (t) == VAR_DECL
+	  && VAR_DECL_IS_VIRTUAL_OPERAND (t))
+	return false;
+      return true;
+    }
+
+  if (TREE_CODE (t) == VAR_DECL
+      && VAR_DECL_IS_VIRTUAL_OPERAND (t))
+    return false;
 
   if (!is_gimple_variable (t))
     return false;
diff --git a/gcc/lto-streamer-in.c b/gcc/lto-streamer-in.c
index 63497f6..271fe99 100644
--- a/gcc/lto-streamer-in.c
+++ b/gcc/lto-streamer-in.c
@@ -616,7 +616,7 @@ input_cfg (struct lto_input_block *ib, struct function *fn,
   int index;
 
   init_empty_tree_cfg_for_function (fn);
-  init_ssa_operands ();
+  init_ssa_operands (fn);
 
   profile_status_for_function (fn) = streamer_read_enum (ib, profile_status_d,
 							 PROFILE_LAST);
diff --git a/gcc/omp-low.c b/gcc/omp-low.c
index 980d06f..0058472 100644
--- a/gcc/omp-low.c
+++ b/gcc/omp-low.c
@@ -3543,11 +3543,9 @@ expand_omp_taskreg (struct omp_region *region)
 
       if (gimple_in_ssa_p (cfun))
 	{
-	  push_cfun (child_cfun);
 	  init_tree_ssa (child_cfun);
-	  init_ssa_operands ();
-	  cfun->gimple_df->in_ssa_p = true;
-	  pop_cfun ();
+	  init_ssa_operands (child_cfun);
+	  child_cfun->gimple_df->in_ssa_p = true;
 	  block = NULL_TREE;
 	}
       else
diff --git a/gcc/tree-dfa.c b/gcc/tree-dfa.c
index 785ae1b..31cafa0 100644
--- a/gcc/tree-dfa.c
+++ b/gcc/tree-dfa.c
@@ -62,7 +62,6 @@ struct dfa_stats_d
 
 /* Local functions.  */
 static void collect_dfa_stats (struct dfa_stats_d *);
-static tree find_vars_r (tree *, int *, void *);
 
 
 /*---------------------------------------------------------------------------
@@ -441,17 +440,19 @@ collect_dfa_stats (struct dfa_stats_d *dfa_stats_p ATTRIBUTE_UNUSED)
    the function.  */
 
 static tree
-find_vars_r (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
+find_vars_r (tree *tp, int *walk_subtrees, void *data)
 {
+  struct function *fn = (struct function *) data;
+
   /* If we are reading the lto info back in, we need to rescan the
      referenced vars.  */
   if (TREE_CODE (*tp) == SSA_NAME)
-    add_referenced_var (SSA_NAME_VAR (*tp));
+    add_referenced_var_1 (SSA_NAME_VAR (*tp), fn);
 
   /* If T is a regular variable that the optimizers are interested
      in, add it to the list of variables.  */
   else if (SSA_VAR_P (*tp))
-    add_referenced_var (*tp);
+    add_referenced_var_1 (*tp, fn);
 
   /* Type, _DECL and constant nodes have no interesting children.
      Ignore them.  */
@@ -471,16 +472,16 @@ find_referenced_vars_in (gimple stmt)
   if (gimple_code (stmt) != GIMPLE_PHI)
     {
       for (i = 0; i < gimple_num_ops (stmt); i++)
-	walk_tree (gimple_op_ptr (stmt, i), find_vars_r, NULL, NULL);
+	walk_tree (gimple_op_ptr (stmt, i), find_vars_r, cfun, NULL);
     }
   else
     {
-      walk_tree (gimple_phi_result_ptr (stmt), find_vars_r, NULL, NULL);
+      walk_tree (gimple_phi_result_ptr (stmt), find_vars_r, cfun, NULL);
 
       for (i = 0; i < gimple_phi_num_args (stmt); i++)
 	{
 	  tree arg = gimple_phi_arg_def (stmt, i);
-	  walk_tree (&arg, find_vars_r, NULL, NULL);
+	  walk_tree (&arg, find_vars_r, cfun, NULL);
 	}
     }
 }
diff --git a/gcc/tree-inline.c b/gcc/tree-inline.c
index 8c116f6..3055d93 100644
--- a/gcc/tree-inline.c
+++ b/gcc/tree-inline.c
@@ -2123,7 +2123,7 @@ initialize_cfun (tree new_fndecl, tree callee_fndecl, gcov_type count)
     {
       init_tree_ssa (cfun);
       cfun->gimple_df->in_ssa_p = true;
-      init_ssa_operands ();
+      init_ssa_operands (cfun);
     }
   pop_cfun ();
 }
diff --git a/gcc/tree-into-ssa.c b/gcc/tree-into-ssa.c
index 170d8d0..86899fe 100644
--- a/gcc/tree-into-ssa.c
+++ b/gcc/tree-into-ssa.c
@@ -2471,7 +2471,7 @@ rewrite_into_ssa (void)
   basic_block bb;
 
   /* Initialize operand data structures.  */
-  init_ssa_operands ();
+  init_ssa_operands (cfun);
 
   /* Initialize internal data needed by the renamer.  */
   init_ssa_renamer ();
diff --git a/gcc/tree-ssa-operands.c b/gcc/tree-ssa-operands.c
index 2994a12..d415ba2 100644
--- a/gcc/tree-ssa-operands.c
+++ b/gcc/tree-ssa-operands.c
@@ -76,34 +76,6 @@ along with GCC; see the file COPYING3.  If not see
    operand vector for VUSE, then the new vector will also be modified
    such that it contains 'a_5' rather than 'a'.  */
 
-/* Structure storing statistics on how many call clobbers we have, and
-   how many where avoided.  */
-
-static struct
-{
-  /* Number of call-clobbered ops we attempt to add to calls in
-     add_call_clobbered_mem_symbols.  */
-  unsigned int clobbered_vars;
-
-  /* Number of write-clobbers (VDEFs) avoided by using
-     not_written information.  */
-  unsigned int static_write_clobbers_avoided;
-
-  /* Number of reads (VUSEs) avoided by using not_read information.  */
-  unsigned int static_read_clobbers_avoided;
-
-  /* Number of write-clobbers avoided because the variable can't escape to
-     this call.  */
-  unsigned int unescapable_clobbers_avoided;
-
-  /* Number of read-only uses we attempt to add to calls in
-     add_call_read_mem_symbols.  */
-  unsigned int readonly_clobbers;
-
-  /* Number of read-only uses we avoid using not_read information.  */
-  unsigned int static_readonly_clobbers_avoided;
-} clobber_stats;
-
 
 /* Flags to describe operand properties in helpers.  */
 
@@ -186,11 +158,11 @@ ssa_operands_active (void)
    representative of all of the virtual operands FUD chain.  */
 
 static void
-create_vop_var (void)
+create_vop_var (struct function *fn)
 {
   tree global_var;
 
-  gcc_assert (cfun->gimple_df->vop == NULL_TREE);
+  gcc_assert (fn->gimple_df->vop == NULL_TREE);
 
   global_var = build_decl (BUILTINS_LOCATION, VAR_DECL,
 			   get_identifier (".MEM"),
@@ -203,10 +175,11 @@ create_vop_var (void)
   DECL_CONTEXT (global_var) = NULL_TREE;
   TREE_THIS_VOLATILE (global_var) = 0;
   TREE_ADDRESSABLE (global_var) = 0;
+  VAR_DECL_IS_VIRTUAL_OPERAND (global_var) = 1;
 
   create_var_ann (global_var);
-  add_referenced_var (global_var);
-  cfun->gimple_df->vop = global_var;
+  add_referenced_var_1 (global_var, fn);
+  fn->gimple_df->vop = global_var;
 }
 
 /* These are the sizes of the operand memory buffer in bytes which gets
@@ -224,7 +197,7 @@ create_vop_var (void)
 /* Initialize the operand cache routines.  */
 
 void
-init_ssa_operands (void)
+init_ssa_operands (struct function *fn)
 {
   if (!n_initialized++)
     {
@@ -235,13 +208,12 @@ init_ssa_operands (void)
       bitmap_obstack_initialize (&operands_bitmap_obstack);
     }
 
-  gcc_assert (gimple_ssa_operands (cfun)->operand_memory == NULL);
-  gimple_ssa_operands (cfun)->operand_memory_index
-     = gimple_ssa_operands (cfun)->ssa_operand_mem_size;
-  gimple_ssa_operands (cfun)->ops_active = true;
-  memset (&clobber_stats, 0, sizeof (clobber_stats));
-  gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_INIT;
-  create_vop_var ();
+  gcc_assert (gimple_ssa_operands (fn)->operand_memory == NULL);
+  gimple_ssa_operands (fn)->operand_memory_index
+     = gimple_ssa_operands (fn)->ssa_operand_mem_size;
+  gimple_ssa_operands (fn)->ops_active = true;
+  gimple_ssa_operands (fn)->ssa_operand_mem_size = OP_SIZE_INIT;
+  create_vop_var (fn);
 }
 
 
@@ -276,22 +248,6 @@ fini_ssa_operands (void)
     bitmap_obstack_release (&operands_bitmap_obstack);
 
   cfun->gimple_df->vop = NULL_TREE;
-
-  if (dump_file && (dump_flags & TDF_STATS))
-    {
-      fprintf (dump_file, "Original clobbered vars:           %d\n",
-	       clobber_stats.clobbered_vars);
-      fprintf (dump_file, "Static write clobbers avoided:     %d\n",
-	       clobber_stats.static_write_clobbers_avoided);
-      fprintf (dump_file, "Static read clobbers avoided:      %d\n",
-	       clobber_stats.static_read_clobbers_avoided);
-      fprintf (dump_file, "Unescapable clobbers avoided:      %d\n",
-	       clobber_stats.unescapable_clobbers_avoided);
-      fprintf (dump_file, "Original read-only clobbers:       %d\n",
-	       clobber_stats.readonly_clobbers);
-      fprintf (dump_file, "Static read-only clobbers avoided: %d\n",
-	       clobber_stats.static_readonly_clobbers_avoided);
-    }
 }
 
 
diff --git a/gcc/tree-ssa-operands.h b/gcc/tree-ssa-operands.h
index ac195b5..e3fe633 100644
--- a/gcc/tree-ssa-operands.h
+++ b/gcc/tree-ssa-operands.h
@@ -100,7 +100,7 @@ struct GTY(()) ssa_operands {
 #define PHI_ARG_INDEX_FROM_USE(USE)   phi_arg_index_from_use (USE)
 
 
-extern void init_ssa_operands (void);
+extern void init_ssa_operands (struct function *fn);
 extern void fini_ssa_operands (void);
 extern void update_stmt_operands (gimple);
 extern void free_stmt_operands (gimple);
diff --git a/gcc/tree.h b/gcc/tree.h
index cc9d4fb..6dda337 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -689,6 +689,9 @@ struct GTY(()) tree_common {
        TYPE_SATURATING in
            all types
 
+       VAR_DECL_IS_VIRTUAL_OPERAND in
+	   VAR_DECL
+
    nowarning_flag:
 
        TREE_NO_WARNING in
@@ -3333,6 +3336,9 @@ extern void decl_fini_priority_insert (tree, priority_type);
    libraries.  */
 #define MAX_RESERVED_INIT_PRIORITY 100
 
+#define VAR_DECL_IS_VIRTUAL_OPERAND(NODE) \
+  (VAR_DECL_CHECK (NODE)->base.saturating_flag)
+
 #define DECL_VAR_ANN_PTR(NODE) \
   (TREE_CODE (NODE) == VAR_DECL ? &(NODE)->var_decl.ann \
    : TREE_CODE (NODE) == PARM_DECL ? &(NODE)->parm_decl.ann \
@@ -5537,7 +5543,6 @@ extern void stack_protect_prologue (void);
 extern void stack_protect_epilogue (void);
 extern void init_dummy_function_start (void);
 extern void expand_dummy_function_end (void);
-extern unsigned int init_function_for_compilation (void);
 extern void allocate_struct_function (tree, bool);
 extern void push_struct_function (tree fndecl);
 extern void init_function_start (tree);