66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
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/* Tree SCC value numbering
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Copyright (C) 2007 Free Software Foundation, Inc.
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Contributed by Daniel Berlin <dberlin@dberlin.org>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef TREE_SSA_SCCVN_H
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#define TREE_SSA_SCCVN_H
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/* TOP of the VN lattice. */
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extern tree VN_TOP;
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typedef struct vn_ssa_aux
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{
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/* SCC information. */
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unsigned int dfsnum;
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bool visited;
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unsigned int low;
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bool on_sccstack;
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/* Value number. This may be an SSA name or a constant. */
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tree valnum;
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/* Representative expression, if not a direct constant. */
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tree expr;
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/* Whether the representative expression contains constants. */
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bool has_constants;
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/* Whether the SSA_NAME has been value numbered already. This is
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only saying whether visit_use has been called on it at least
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once. It cannot be used to avoid visitation for SSA_NAME's
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involved in non-singleton SCC's. */
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bool use_processed;
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} *vn_ssa_aux_t;
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/* Return the value numbering info for an SSA_NAME. */
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extern vn_ssa_aux_t VN_INFO (tree);
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extern vn_ssa_aux_t VN_INFO_GET (tree);
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void run_scc_vn (void);
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void free_scc_vn (void);
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void switch_to_PRE_table (void);
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tree vn_binary_op_lookup (tree);
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void vn_binary_op_insert (tree, tree);
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tree vn_unary_op_lookup (tree);
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void vn_unary_op_insert (tree, tree);
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tree vn_reference_lookup (tree, VEC (tree, gc) *);
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void vn_reference_insert (tree, tree, VEC (tree, gc) *);
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VEC (tree, gc) *shared_vuses_from_stmt (tree);
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VEC (tree, gc) *copy_vuses_from_stmt (tree);
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#endif /* TREE_SSA_SCCVN_H */
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