/* Chains of recurrences.
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/* Chains of recurrences.
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Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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Contributed by Sebastian Pop <pop@cri.ensmp.fr>
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Contributed by Sebastian Pop <pop@cri.ensmp.fr>
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This file is part of GCC.
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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 it under
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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Software Foundation; either version 3, or (at your option) any later
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version.
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_TREE_CHREC_H
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#ifndef GCC_TREE_CHREC_H
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#define GCC_TREE_CHREC_H
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#define GCC_TREE_CHREC_H
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/* Accessors for the chains of recurrences. */
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/* Accessors for the chains of recurrences. */
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#define CHREC_VAR(NODE) TREE_OPERAND (NODE, 0)
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#define CHREC_VAR(NODE) TREE_OPERAND (NODE, 0)
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#define CHREC_LEFT(NODE) TREE_OPERAND (NODE, 1)
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#define CHREC_LEFT(NODE) TREE_OPERAND (NODE, 1)
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#define CHREC_RIGHT(NODE) TREE_OPERAND (NODE, 2)
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#define CHREC_RIGHT(NODE) TREE_OPERAND (NODE, 2)
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#define CHREC_VARIABLE(NODE) TREE_INT_CST_LOW (CHREC_VAR (NODE))
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#define CHREC_VARIABLE(NODE) TREE_INT_CST_LOW (CHREC_VAR (NODE))
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/* The following trees are unique elements. Thus the comparison of another
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/* The following trees are unique elements. Thus the comparison of another
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element to these elements should be done on the pointer to these trees,
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element to these elements should be done on the pointer to these trees,
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and not on their value. */
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and not on their value. */
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extern tree chrec_not_analyzed_yet;
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extern tree chrec_not_analyzed_yet;
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extern GTY(()) tree chrec_dont_know;
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extern GTY(()) tree chrec_dont_know;
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extern GTY(()) tree chrec_known;
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extern GTY(()) tree chrec_known;
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/* After having added an automatically generated element, please
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/* After having added an automatically generated element, please
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include it in the following function. */
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include it in the following function. */
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static inline bool
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static inline bool
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automatically_generated_chrec_p (tree chrec)
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automatically_generated_chrec_p (tree chrec)
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{
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{
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return (chrec == chrec_not_analyzed_yet
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return (chrec == chrec_not_analyzed_yet
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|| chrec == chrec_dont_know
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|| chrec == chrec_dont_know
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|| chrec == chrec_known);
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|| chrec == chrec_known);
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}
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}
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/* The tree nodes aka. CHRECs. */
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/* The tree nodes aka. CHRECs. */
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static inline bool
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static inline bool
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tree_is_chrec (tree expr)
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tree_is_chrec (tree expr)
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{
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{
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if (TREE_CODE (expr) == POLYNOMIAL_CHREC
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if (TREE_CODE (expr) == POLYNOMIAL_CHREC
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|| automatically_generated_chrec_p (expr))
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|| automatically_generated_chrec_p (expr))
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return true;
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return true;
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else
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else
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return false;
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return false;
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}
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}
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/* Chrec folding functions. */
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/* Chrec folding functions. */
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extern tree chrec_fold_plus (tree, tree, tree);
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extern tree chrec_fold_plus (tree, tree, tree);
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extern tree chrec_fold_minus (tree, tree, tree);
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extern tree chrec_fold_minus (tree, tree, tree);
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extern tree chrec_fold_multiply (tree, tree, tree);
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extern tree chrec_fold_multiply (tree, tree, tree);
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extern tree chrec_convert (tree, tree, tree);
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extern tree chrec_convert (tree, tree, tree);
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extern tree chrec_convert_aggressive (tree, tree);
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extern tree chrec_convert_aggressive (tree, tree);
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/* Operations. */
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/* Operations. */
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extern tree chrec_apply (unsigned, tree, tree);
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extern tree chrec_apply (unsigned, tree, tree);
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extern tree chrec_replace_initial_condition (tree, tree);
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extern tree chrec_replace_initial_condition (tree, tree);
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extern tree initial_condition (tree);
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extern tree initial_condition (tree);
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extern tree initial_condition_in_loop_num (tree, unsigned);
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extern tree initial_condition_in_loop_num (tree, unsigned);
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extern tree evolution_part_in_loop_num (tree, unsigned);
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extern tree evolution_part_in_loop_num (tree, unsigned);
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extern tree hide_evolution_in_other_loops_than_loop (tree, unsigned);
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extern tree hide_evolution_in_other_loops_than_loop (tree, unsigned);
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extern tree reset_evolution_in_loop (unsigned, tree, tree);
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extern tree reset_evolution_in_loop (unsigned, tree, tree);
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extern tree chrec_merge (tree, tree);
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extern tree chrec_merge (tree, tree);
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/* Observers. */
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/* Observers. */
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extern bool eq_evolutions_p (tree, tree);
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extern bool eq_evolutions_p (tree, tree);
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extern bool is_multivariate_chrec (tree);
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extern bool is_multivariate_chrec (tree);
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extern bool chrec_is_positive (tree, bool *);
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extern bool chrec_is_positive (tree, bool *);
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extern bool chrec_contains_symbols (tree);
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extern bool chrec_contains_symbols (tree);
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extern bool chrec_contains_symbols_defined_in_loop (tree, unsigned);
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extern bool chrec_contains_symbols_defined_in_loop (tree, unsigned);
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extern bool chrec_contains_undetermined (tree);
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extern bool chrec_contains_undetermined (tree);
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extern bool tree_contains_chrecs (tree, int *);
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extern bool tree_contains_chrecs (tree, int *);
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extern bool evolution_function_is_affine_multivariate_p (tree);
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extern bool evolution_function_is_affine_multivariate_p (tree);
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extern bool evolution_function_is_univariate_p (tree);
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extern bool evolution_function_is_univariate_p (tree);
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extern unsigned nb_vars_in_chrec (tree);
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extern unsigned nb_vars_in_chrec (tree);
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/* Build a polynomial chain of recurrence. */
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/* Build a polynomial chain of recurrence. */
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static inline tree
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static inline tree
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build_polynomial_chrec (unsigned loop_num,
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build_polynomial_chrec (unsigned loop_num,
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tree left,
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tree left,
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tree right)
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tree right)
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{
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{
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if (left == chrec_dont_know
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if (left == chrec_dont_know
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|| right == chrec_dont_know)
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|| right == chrec_dont_know)
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return chrec_dont_know;
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return chrec_dont_know;
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gcc_assert (TREE_TYPE (left) == TREE_TYPE (right));
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gcc_assert (TREE_TYPE (left) == TREE_TYPE (right));
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return build3 (POLYNOMIAL_CHREC, TREE_TYPE (left),
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return build3 (POLYNOMIAL_CHREC, TREE_TYPE (left),
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build_int_cst (NULL_TREE, loop_num), left, right);
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build_int_cst (NULL_TREE, loop_num), left, right);
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}
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}
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/* Observers. */
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/* Observers. */
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/* Determines whether CHREC is equal to zero. */
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/* Determines whether CHREC is equal to zero. */
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static inline bool
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static inline bool
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chrec_zerop (tree chrec)
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chrec_zerop (tree chrec)
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{
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{
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if (chrec == NULL_TREE)
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if (chrec == NULL_TREE)
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return false;
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return false;
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if (TREE_CODE (chrec) == INTEGER_CST)
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if (TREE_CODE (chrec) == INTEGER_CST)
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return integer_zerop (chrec);
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return integer_zerop (chrec);
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return false;
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return false;
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}
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}
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/* Determines whether the expression CHREC is a constant. */
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/* Determines whether the expression CHREC is a constant. */
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static inline bool
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static inline bool
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evolution_function_is_constant_p (tree chrec)
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evolution_function_is_constant_p (tree chrec)
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{
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{
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if (chrec == NULL_TREE)
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if (chrec == NULL_TREE)
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return false;
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return false;
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switch (TREE_CODE (chrec))
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switch (TREE_CODE (chrec))
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{
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{
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case INTEGER_CST:
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case INTEGER_CST:
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case REAL_CST:
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case REAL_CST:
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return true;
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return true;
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default:
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default:
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return false;
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return false;
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}
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}
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}
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}
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extern bool evolution_function_is_invariant_p (tree, int);
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extern bool evolution_function_is_invariant_p (tree, int);
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/* Determine whether the given tree is an affine evolution function or not. */
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/* Determine whether the given tree is an affine evolution function or not. */
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static inline bool
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static inline bool
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evolution_function_is_affine_p (tree chrec)
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evolution_function_is_affine_p (tree chrec)
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{
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{
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if (chrec == NULL_TREE)
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if (chrec == NULL_TREE)
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return false;
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return false;
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switch (TREE_CODE (chrec))
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switch (TREE_CODE (chrec))
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{
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{
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case POLYNOMIAL_CHREC:
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case POLYNOMIAL_CHREC:
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if (evolution_function_is_invariant_p (CHREC_LEFT (chrec),
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if (evolution_function_is_invariant_p (CHREC_LEFT (chrec),
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CHREC_VARIABLE (chrec))
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CHREC_VARIABLE (chrec))
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&& evolution_function_is_invariant_p (CHREC_RIGHT (chrec),
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&& evolution_function_is_invariant_p (CHREC_RIGHT (chrec),
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CHREC_VARIABLE (chrec)))
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CHREC_VARIABLE (chrec)))
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return true;
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return true;
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else
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else
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return false;
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return false;
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default:
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default:
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return false;
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return false;
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}
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}
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}
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}
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/* Determine whether the given tree is an affine or constant evolution
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/* Determine whether the given tree is an affine or constant evolution
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function. */
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function. */
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static inline bool
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static inline bool
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evolution_function_is_affine_or_constant_p (tree chrec)
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evolution_function_is_affine_or_constant_p (tree chrec)
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{
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{
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return evolution_function_is_affine_p (chrec)
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return evolution_function_is_affine_p (chrec)
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|| evolution_function_is_constant_p (chrec);
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|| evolution_function_is_constant_p (chrec);
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}
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}
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/* Determines whether EXPR does not contains chrec expressions. */
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/* Determines whether EXPR does not contains chrec expressions. */
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static inline bool
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static inline bool
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tree_does_not_contain_chrecs (tree expr)
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tree_does_not_contain_chrecs (tree expr)
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{
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{
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return !tree_contains_chrecs (expr, NULL);
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return !tree_contains_chrecs (expr, NULL);
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}
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}
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/* Determines whether CHREC is a loop invariant with respect to LOOP_NUM.
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/* Determines whether CHREC is a loop invariant with respect to LOOP_NUM.
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Set the result in RES and return true when the property can be computed. */
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Set the result in RES and return true when the property can be computed. */
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static inline bool
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static inline bool
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no_evolution_in_loop_p (tree chrec, unsigned loop_num, bool *res)
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no_evolution_in_loop_p (tree chrec, unsigned loop_num, bool *res)
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{
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{
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tree scev;
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tree scev;
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if (chrec == chrec_not_analyzed_yet
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if (chrec == chrec_not_analyzed_yet
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|| chrec == chrec_dont_know
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|| chrec == chrec_dont_know
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|| chrec_contains_symbols_defined_in_loop (chrec, loop_num))
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|| chrec_contains_symbols_defined_in_loop (chrec, loop_num))
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return false;
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return false;
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scev = hide_evolution_in_other_loops_than_loop (chrec, loop_num);
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scev = hide_evolution_in_other_loops_than_loop (chrec, loop_num);
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*res = !tree_is_chrec (scev);
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*res = !tree_is_chrec (scev);
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return true;
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return true;
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}
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}
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/* Returns the type of the chrec. */
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/* Returns the type of the chrec. */
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static inline tree
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static inline tree
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chrec_type (tree chrec)
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chrec_type (tree chrec)
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{
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{
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if (automatically_generated_chrec_p (chrec))
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if (automatically_generated_chrec_p (chrec))
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return NULL_TREE;
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return NULL_TREE;
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return TREE_TYPE (chrec);
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return TREE_TYPE (chrec);
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}
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}
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#endif /* GCC_TREE_CHREC_H */
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#endif /* GCC_TREE_CHREC_H */
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