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Diffstat (limited to 'gcc/tree-chrec.h')
| -rw-r--r-- | gcc/tree-chrec.h | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/gcc/tree-chrec.h b/gcc/tree-chrec.h new file mode 100644 index 0000000..bc5c778 --- /dev/null +++ b/gcc/tree-chrec.h @@ -0,0 +1,224 @@ +/* Chains of recurrences. + Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc. + Contributed by Sebastian Pop <pop@cri.ensmp.fr> + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 2, 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 COPYING. If not, write to the Free +Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301, USA. */ + +#ifndef GCC_TREE_CHREC_H +#define GCC_TREE_CHREC_H + +/* Accessors for the chains of recurrences. */ +#define CHREC_VAR(NODE) TREE_OPERAND (NODE, 0) +#define CHREC_LEFT(NODE) TREE_OPERAND (NODE, 1) +#define CHREC_RIGHT(NODE) TREE_OPERAND (NODE, 2) +#define CHREC_VARIABLE(NODE) TREE_INT_CST_LOW (CHREC_VAR (NODE)) + + + +/* The following trees are unique elements. Thus the comparison of another + element to these elements should be done on the pointer to these trees, + and not on their value. */ + +extern tree chrec_not_analyzed_yet; +extern GTY(()) tree chrec_dont_know; +extern GTY(()) tree chrec_known; + +/* After having added an automatically generated element, please + include it in the following function. */ + +static inline bool +automatically_generated_chrec_p (tree chrec) +{ + return (chrec == chrec_not_analyzed_yet + || chrec == chrec_dont_know + || chrec == chrec_known); +} + +/* The tree nodes aka. CHRECs. */ + +static inline bool +tree_is_chrec (tree expr) +{ + if (TREE_CODE (expr) == POLYNOMIAL_CHREC + || automatically_generated_chrec_p (expr)) + return true; + else + return false; +} + + + +/* Chrec folding functions. */ +extern tree chrec_fold_plus (tree, tree, tree); +extern tree chrec_fold_minus (tree, tree, tree); +extern tree chrec_fold_multiply (tree, tree, tree); +extern tree chrec_convert (tree, tree, tree); +extern tree chrec_convert_aggressive (tree, tree); + +/* Operations. */ +extern tree chrec_apply (unsigned, tree, tree); +extern tree chrec_replace_initial_condition (tree, tree); +extern tree initial_condition (tree); +extern tree initial_condition_in_loop_num (tree, unsigned); +extern tree evolution_part_in_loop_num (tree, unsigned); +extern tree hide_evolution_in_other_loops_than_loop (tree, unsigned); +extern tree reset_evolution_in_loop (unsigned, tree, tree); +extern tree chrec_merge (tree, tree); + +/* Observers. */ +extern bool eq_evolutions_p (tree, tree); +extern bool is_multivariate_chrec (tree); +extern bool chrec_is_positive (tree, bool *); +extern bool chrec_contains_symbols (tree); +extern bool chrec_contains_symbols_defined_in_loop (tree, unsigned); +extern bool chrec_contains_undetermined (tree); +extern bool tree_contains_chrecs (tree, int *); +extern bool evolution_function_is_affine_multivariate_p (tree); +extern bool evolution_function_is_univariate_p (tree); +extern unsigned nb_vars_in_chrec (tree); + + + +/* Build a polynomial chain of recurrence. */ + +static inline tree +build_polynomial_chrec (unsigned loop_num, + tree left, + tree right) +{ + if (left == chrec_dont_know + || right == chrec_dont_know) + return chrec_dont_know; + + gcc_assert (TREE_TYPE (left) == TREE_TYPE (right)); + + return build3 (POLYNOMIAL_CHREC, TREE_TYPE (left), + build_int_cst (NULL_TREE, loop_num), left, right); +} + + + +/* Observers. */ + +/* Determines whether CHREC is equal to zero. */ + +static inline bool +chrec_zerop (tree chrec) +{ + if (chrec == NULL_TREE) + return false; + + if (TREE_CODE (chrec) == INTEGER_CST) + return integer_zerop (chrec); + + return false; +} + +/* Determines whether the expression CHREC is a constant. */ + +static inline bool +evolution_function_is_constant_p (tree chrec) +{ + if (chrec == NULL_TREE) + return false; + + switch (TREE_CODE (chrec)) + { + case INTEGER_CST: + case REAL_CST: + return true; + + default: + return false; + } +} + +extern bool evolution_function_is_invariant_p (tree, int); +/* Determine whether the given tree is an affine evolution function or not. */ + +static inline bool +evolution_function_is_affine_p (tree chrec) +{ + if (chrec == NULL_TREE) + return false; + + switch (TREE_CODE (chrec)) + { + case POLYNOMIAL_CHREC: + if (evolution_function_is_invariant_p (CHREC_LEFT (chrec), + CHREC_VARIABLE (chrec)) + && evolution_function_is_invariant_p (CHREC_RIGHT (chrec), + CHREC_VARIABLE (chrec))) + return true; + else + return false; + + default: + return false; + } +} + +/* Determine whether the given tree is an affine or constant evolution + function. */ + +static inline bool +evolution_function_is_affine_or_constant_p (tree chrec) +{ + return evolution_function_is_affine_p (chrec) + || evolution_function_is_constant_p (chrec); +} + +/* Determines whether EXPR does not contains chrec expressions. */ + +static inline bool +tree_does_not_contain_chrecs (tree expr) +{ + return !tree_contains_chrecs (expr, NULL); +} + +/* Determines whether CHREC is a loop invariant with respect to LOOP_NUM. + Set the result in RES and return true when the property can be computed. */ + +static inline bool +no_evolution_in_loop_p (tree chrec, unsigned loop_num, bool *res) +{ + tree scev; + + if (chrec == chrec_not_analyzed_yet + || chrec == chrec_dont_know + || chrec_contains_symbols_defined_in_loop (chrec, loop_num)) + return false; + + scev = hide_evolution_in_other_loops_than_loop (chrec, loop_num); + *res = !tree_is_chrec (scev); + return true; +} + +/* Returns the type of the chrec. */ + +static inline tree +chrec_type (tree chrec) +{ + if (automatically_generated_chrec_p (chrec)) + return NULL_TREE; + + return TREE_TYPE (chrec); +} + + +#endif /* GCC_TREE_CHREC_H */ |
