re PR tree-optimization/1046 (gcc less efficient than jdk for recursion with -finline-functions)

	PR tree-optimization/1046
	* tree-tailcall.c (suitable_for_tail_call_opt_p): Use TREE_ADDRESSABLE
	when alias info is not ready.
	(pass_tail_recursion): Do not require aliasing.
	* tree-ssa-copyrename.c (pass_rename_ssa_cop): Likewise.
	* tree-ssa-ccp.c (pass_ccp, pass_fold_builtins): Likewise.
	* tree-ssa-copy.c (pass_copy_prop): Likewise.
	* tree-ssa-forwprop.c (pass_forwprop): Likewise.
	* tree-ssa-dce.c (pass_dce, pass_dce_loop, pass_cd_dce): Likewise.
	* passes.c (init_optimization_passes): Execute rename_ssa_copies,
	ccp, forwprop, copy_prop, merge_phi, copy_prop, dce and tail recursion
	before inlining.
	* tree-ssa-operands.c (add_virtual_operand, get_indirect_ref_operand):
	When aliasing is not build, mark statement as volatile.

	* gcc.dg/tree-ssa/tailrecursion-4.c: Update dump file.
	* gcc.dg/tree-ssa/tailrecursion-1.c: Update dump file.
	* gcc.dg/tree-ssa/tailrecursion-2.c: Update dump file.
	* gcc.dg/tree-ssa/tailrecursion-3.c: Update dump file.
	* gcc.dg/tree-ssa/pr21658.c: Likewise.
	* gcc.dg/tree-ssa/pr15349.c: Likewise.
	* gcc.dg/tree-ssa/pr25501.c: Likewise.
	* gcc.dg/tree-ssa/vrp11.c: Make more complex so it still test
	transformation in question.
	* gcc.dg/tree-ssa/vrp05.c: Likewise.
	* gcc.dg/tree-ssa/pr20701.c: Likewise.
	* gcc.dg/always_inline3.c: Likewise.

From-SVN: r120681

gcc/ChangeLog

+2007-01-11  Jan Hubicka  <jh@suse.cz>
+
+	PR tree-optimization/1046
+	* tree-tailcall.c (suitable_for_tail_call_opt_p): Use TREE_ADDRESSABLE
+	when alias info is not ready.
+	(pass_tail_recursion): Do not require aliasing.
+	* tree-ssa-copyrename.c (pass_rename_ssa_cop): Likewise.
+	* tree-ssa-ccp.c (pass_ccp, pass_fold_builtins): Likewise.
+	* tree-ssa-copy.c (pass_copy_prop): Likewise.
+	* tree-ssa-forwprop.c (pass_forwprop): Likewise.
+	* tree-ssa-dce.c (pass_dce, pass_dce_loop, pass_cd_dce): Likewise.
+	* passes.c (init_optimization_passes): Execute rename_ssa_copies,
+	ccp, forwprop, copy_prop, merge_phi, copy_prop, dce and tail recursion
+	before inlining.
+	* tree-ssa-operands.c (add_virtual_operand, get_indirect_ref_operand):
+	When aliasing is not build, mark statement as volatile.
+
 2007-01-11  Tom Tromey  <tromey@redhat.com>
 
 	PR preprocessor/15185, PR preprocessor/20989:

gcc/passes.c

@@ -481,6 +481,15 @@ init_optimization_passes (void)
   NEXT_PASS (pass_build_ssa);
   NEXT_PASS (pass_early_warn_uninitialized);
   NEXT_PASS (pass_cleanup_cfg);
+  NEXT_PASS (pass_rename_ssa_copies);
+  NEXT_PASS (pass_ccp);
+  
+  NEXT_PASS (pass_forwprop);
+  NEXT_PASS (pass_copy_prop);
+  NEXT_PASS (pass_merge_phi);
+  NEXT_PASS (pass_dce);
+  NEXT_PASS (pass_tail_recursion);
+  NEXT_PASS (pass_release_ssa_names);
 
   *p = NULL;
 
@@ -1003,6 +1012,11 @@ execute_ipa_pass_list (struct tree_opt_pass *pass)
     {
       gcc_assert (!current_function_decl);
       gcc_assert (!cfun);
+      if (!quiet_flag)
+	{
+          fprintf (stderr, " <%s>", pass->name ? pass->name : "");
+	  fflush (stderr);
+	}
       if (execute_one_pass (pass) && pass->sub)
 	do_per_function ((void (*)(void *))execute_pass_list, pass->sub);
       if (!current_function_decl)

gcc/tree-pass.h

@@ -398,6 +398,7 @@ extern struct tree_opt_pass pass_shorten_branches;
 extern struct tree_opt_pass pass_set_nothrow_function_flags;
 extern struct tree_opt_pass pass_final;
 extern struct tree_opt_pass pass_rtl_seqabstr;
+extern struct tree_opt_pass pass_release_ssa_names;
 
 /* The root of the compilation pass tree, once constructed.  */
 extern struct tree_opt_pass *all_passes, *all_ipa_passes, *all_lowering_passes;

gcc/tree-ssa-ccp.c

@@ -1431,7 +1431,7 @@ struct tree_opt_pass pass_ccp =
   NULL,					/* next */
   0,					/* static_pass_number */
   TV_TREE_CCP,				/* tv_id */
-  PROP_cfg | PROP_ssa | PROP_alias,	/* properties_required */
+  PROP_cfg | PROP_ssa,			/* properties_required */
   0,					/* properties_provided */
   0,					/* properties_destroyed */
   0,					/* todo_flags_start */
@@ -2650,7 +2650,7 @@ struct tree_opt_pass pass_fold_builtins =
   NULL,					/* next */
   0,					/* static_pass_number */
   0,					/* tv_id */
-  PROP_cfg | PROP_ssa | PROP_alias,	/* properties_required */
+  PROP_cfg | PROP_ssa,			/* properties_required */
   0,					/* properties_provided */
   0,					/* properties_destroyed */
   0,					/* todo_flags_start */

gcc/tree-ssa-copy.c

@@ -1137,7 +1137,7 @@ struct tree_opt_pass pass_copy_prop =
   NULL,					/* next */
   0,					/* static_pass_number */
   TV_TREE_COPY_PROP,			/* tv_id */
-  PROP_ssa | PROP_alias | PROP_cfg,	/* properties_required */
+  PROP_ssa | PROP_cfg,			/* properties_required */
   0,					/* properties_provided */
   0,					/* properties_destroyed */
   0,					/* todo_flags_start */

gcc/tree-ssa-copyrename.c

@@ -394,7 +394,7 @@ struct tree_opt_pass pass_rename_ssa_copies =
   NULL,					/* next */
   0,					/* static_pass_number */
   TV_TREE_COPY_RENAME,			/* tv_id */
-  PROP_cfg | PROP_ssa | PROP_alias,	/* properties_required */
+  PROP_cfg | PROP_ssa,			/* properties_required */
   0,					/* properties_provided */
   0,					/* properties_destroyed */
   0,					/* todo_flags_start */ 

gcc/tree-ssa-dce.c

@@ -859,7 +859,7 @@ struct tree_opt_pass pass_dce =
   NULL,					/* next */
   0,					/* static_pass_number */
   TV_TREE_DCE,				/* tv_id */
-  PROP_cfg | PROP_ssa | PROP_alias,	/* properties_required */
+  PROP_cfg | PROP_ssa,			/* properties_required */
   0,					/* properties_provided */
   0,					/* properties_destroyed */
   0,					/* todo_flags_start */
@@ -881,7 +881,7 @@ struct tree_opt_pass pass_dce_loop =
   NULL,					/* next */
   0,					/* static_pass_number */
   TV_TREE_DCE,				/* tv_id */
-  PROP_cfg | PROP_ssa | PROP_alias,	/* properties_required */
+  PROP_cfg | PROP_ssa,			/* properties_required */
   0,					/* properties_provided */
   0,					/* properties_destroyed */
   0,					/* todo_flags_start */
@@ -901,7 +901,7 @@ struct tree_opt_pass pass_cd_dce =
   NULL,					/* next */
   0,					/* static_pass_number */
   TV_TREE_CD_DCE,			/* tv_id */
-  PROP_cfg | PROP_ssa | PROP_alias,	/* properties_required */
+  PROP_cfg | PROP_ssa,			/* properties_required */
   0,					/* properties_provided */
   0,					/* properties_destroyed */
   0,					/* todo_flags_start */

gcc/tree-ssa-forwprop.c

@@ -1060,8 +1060,7 @@ struct tree_opt_pass pass_forwprop = {
   NULL,				/* next */
   0,				/* static_pass_number */
   TV_TREE_FORWPROP,		/* tv_id */
-  PROP_cfg | PROP_ssa
-    | PROP_alias,		/* properties_required */
+  PROP_cfg | PROP_ssa,		/* properties_required */
   0,				/* properties_provided */
   0,				/* properties_destroyed */
   0,				/* todo_flags_start */

gcc/tree-ssa-operands.c

@@ -1480,6 +1480,8 @@ add_virtual_operand (tree var, stmt_ann_t s_ann, int flags,
   aliases = v_ann->may_aliases;
   if (aliases == NULL)
     {
+      if (s_ann && !gimple_aliases_computed_p (cfun))
+        s_ann->has_volatile_ops = true;
       /* The variable is not aliased or it is an alias tag.  */
       if (flags & opf_def)
 	append_vdef (var);
@@ -1610,6 +1612,8 @@ get_indirect_ref_operands (tree stmt, tree expr, int flags,
   stmt_ann_t s_ann = stmt_ann (stmt);
 
   s_ann->references_memory = true;
+  if (s_ann && TREE_THIS_VOLATILE (expr))
+    s_ann->has_volatile_ops = true; 
 
   if (SSA_VAR_P (ptr))
     {
@@ -1652,6 +1656,11 @@ get_indirect_ref_operands (tree stmt, tree expr, int flags,
 	  if (v_ann->symbol_mem_tag)
 	    add_virtual_operand (v_ann->symbol_mem_tag, s_ann, flags,
 				 full_ref, offset, size, false);
+          /* Aliasing information is missing; mark statement as volatile so we
+             won't optimize it out too actively.  */
+          else if (s_ann && !gimple_aliases_computed_p (cfun)
+                   && (flags & opf_def))
+            s_ann->has_volatile_ops = true;
 	}
     }
   else if (TREE_CODE (ptr) == INTEGER_CST)

gcc/tree-ssanames.c

@@ -26,6 +26,7 @@ Boston, MA 02110-1301, USA.  */
 #include "varray.h"
 #include "ggc.h"
 #include "tree-flow.h"
+#include "tree-pass.h"
 
 /* Rewriting a function into SSA form can create a huge number of SSA_NAMEs,
    many of which may be thrown away shortly after their creation if jumps
@@ -304,3 +305,48 @@ replace_ssa_name_symbol (tree ssa_name, tree sym)
   SSA_NAME_VAR (ssa_name) = sym;
   TREE_TYPE (ssa_name) = TREE_TYPE (sym);
 }
+
+/* Return SSA names that are unused to GGC memory.  This is used to keep
+   footprint of compiler during interprocedural optimization.
+   As a side effect the SSA_NAME_VERSION number reuse is reduced
+   so this function should not be used too often.  */
+static unsigned int
+release_dead_ssa_names (void)
+{
+  tree t, next;
+  int n = 0;
+  referenced_var_iterator rvi;
+
+  /* Current defs point to various dead SSA names that in turn points to dead
+     statements so bunch of dead memory is holded from releasing.  */
+  FOR_EACH_REFERENCED_VAR (t, rvi)
+    set_current_def (t, NULL);
+  /* Now release the freelist.  */
+  for (t = FREE_SSANAMES (cfun); t; t = next)
+    {
+      next = TREE_CHAIN (t);
+      ggc_free (t);
+      n++;
+    }
+  FREE_SSANAMES (cfun) = NULL;
+  if (dump_file)
+    fprintf (dump_file, "Released %i names, %.2f%%\n", n, n * 100.0 / num_ssa_names);
+  return 0;
+}
+
+struct tree_opt_pass pass_release_ssa_names =
+{
+  "release_ssa",			/* name */
+  NULL,					/* gate */
+  release_dead_ssa_names,		/* execute */
+  NULL,					/* sub */
+  NULL,					/* next */
+  0,					/* static_pass_number */
+  0,					/* tv_id */
+  PROP_ssa,				/* properties_required */
+  0,					/* properties_provided */
+  0,					/* properties_destroyed */
+  0,					/* todo_flags_start */
+  0,					/* todo_flags_finish */
+  0					/* letter */
+};

gcc/tree-tailcall.c

@@ -143,10 +143,10 @@ suitable_for_tail_opt_p (void)
 
   FOR_EACH_REFERENCED_VAR (var, rvi)
     {
-
       if (!is_global_var (var)
 	  && (!MTAG_P (var) || TREE_CODE (var) == STRUCT_FIELD_TAG)
-	  && is_call_clobbered (var))
+	  && (gimple_aliases_computed_p (cfun) ? is_call_clobbered (var)
+	      : TREE_ADDRESSABLE (var)))
 	return false;
     }
 
@@ -1023,7 +1023,7 @@ struct tree_opt_pass pass_tail_recursion =
   NULL,					/* next */
   0,					/* static_pass_number */
   0,					/* tv_id */
-  PROP_cfg | PROP_ssa | PROP_alias,	/* properties_required */
+  PROP_cfg | PROP_ssa,			/* properties_required */
   0,					/* properties_provided */
   0,					/* properties_destroyed */
   0,					/* todo_flags_start */