gcc/tree-ssa-sccvn.h

   1 /* Tree SCC value numbering
   2    Copyright (C) 2007 Free Software Foundation, Inc.
   3    Contributed by Daniel Berlin <dberlin@dberlin.org>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; if not, write to the Free Software
  19 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  20 */
  21
  22 #ifndef TREE_SSA_SCCVN_H
  23 #define TREE_SSA_SCCVN_H
  24
  25 /* TOP of the VN lattice.  */
  26 extern tree VN_TOP;
  27
  28 typedef struct vn_ssa_aux
  29 {
  30   /* SCC information.  */
  31   unsigned int dfsnum;
  32   bool visited;
  33   unsigned int low;
  34   bool on_sccstack;
  35
  36   /* Value number. This may be an SSA name or a constant.  */
  37   tree valnum;
  38   /* Representative expression, if not a direct constant. */
  39   tree expr;
  40   /* Whether the representative expression contains constants.  */
  41   bool has_constants;
  42   /* Whether the SSA_NAME has been value numbered already.  This is
  43      only saying whether visit_use has been called on it at least
  44      once.  It cannot be used to avoid visitation for SSA_NAME's
  45      involved in non-singleton SCC's.  */
  46   bool use_processed;
  47 } *vn_ssa_aux_t;
  48
  49 /* Return the value numbering info for an SSA_NAME.  */
  50 extern vn_ssa_aux_t VN_INFO (tree);
  51 extern vn_ssa_aux_t VN_INFO_GET (tree);
  52 void run_scc_vn (void);
  53 void free_scc_vn (void);
  54 void switch_to_PRE_table (void);
  55 tree vn_binary_op_lookup (tree);
  56 void vn_binary_op_insert (tree, tree);
  57 tree vn_unary_op_lookup (tree);
  58 void vn_unary_op_insert (tree, tree);
  59 tree vn_reference_lookup (tree, VEC (tree, gc) *);
  60 void vn_reference_insert (tree, tree, VEC (tree, gc) *);
  61 VEC (tree, gc) *shared_vuses_from_stmt (tree);
  62 VEC (tree, gc) *copy_vuses_from_stmt (tree);
  63
  64
  65 #endif /* TREE_SSA_SCCVN_H  */