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/* Tree SCC value numbering
Copyright (C) 2007 Free Software Foundation, Inc.
Contributed by Daniel Berlin <dberlin@dberlin.org>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef TREE_SSA_SCCVN_H
#define TREE_SSA_SCCVN_H
/* TOP of the VN lattice. */
extern tree VN_TOP;
typedef struct vn_ssa_aux
{
/* Value number. This may be an SSA name or a constant. */
tree valnum;
/* Representative expression, if not a direct constant. */
tree expr;
/* SCC information. */
unsigned int dfsnum;
unsigned int low;
unsigned visited : 1;
unsigned on_sccstack : 1;
/* Whether the representative expression contains constants. */
unsigned has_constants : 1;
/* Whether the SSA_NAME has been value numbered already. This is
only saying whether visit_use has been called on it at least
once. It cannot be used to avoid visitation for SSA_NAME's
involved in non-singleton SCC's. */
unsigned use_processed : 1;
} *vn_ssa_aux_t;
/* Return the value numbering info for an SSA_NAME. */
extern vn_ssa_aux_t VN_INFO (tree);
extern vn_ssa_aux_t VN_INFO_GET (tree);
bool run_scc_vn (void);
void free_scc_vn (void);
void switch_to_PRE_table (void);
tree vn_binary_op_lookup (tree);
void vn_binary_op_insert (tree, tree);
tree vn_unary_op_lookup (tree);
void vn_unary_op_insert (tree, tree);
tree vn_reference_lookup (tree, VEC (tree, gc) *);
void vn_reference_insert (tree, tree, VEC (tree, gc) *);
VEC (tree, gc) *shared_vuses_from_stmt (tree);
VEC (tree, gc) *copy_vuses_from_stmt (tree);
#endif /* TREE_SSA_SCCVN_H */
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