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/* Operations with affine combinations of trees.
Copyright (C) 2005-2024 Free Software Foundation, Inc.
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 3, 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/>. */
/* Affine combination of trees. We keep track of at most MAX_AFF_ELTS elements
to make things simpler; this is sufficient in most cases. */
#ifndef GCC_TREE_AFFINE_H
#define GCC_TREE_AFFINE_H
#define MAX_AFF_ELTS 8
/* Element of an affine combination. */
class aff_comb_elt
{
public:
/* The value of the element. */
tree val;
/* Its coefficient in the combination. */
widest_int coef;
};
class aff_tree
{
public:
/* Type of the result of the combination. */
tree type;
/* Constant offset. */
poly_widest_int offset;
/* Number of elements of the combination. */
unsigned n;
/* Elements and their coefficients. Type of elements may be different from
TYPE, but their sizes must be the same (STRIP_NOPS is applied to the
elements).
The coefficients are always sign extended from the precision of TYPE
(regardless of signedness of TYPE). */
class aff_comb_elt elts[MAX_AFF_ELTS];
/* Remainder of the expression. Usually NULL, used only if there are more
than MAX_AFF_ELTS elements. Type of REST will be either sizetype for
TYPE of POINTER_TYPEs or TYPE. */
tree rest;
};
class name_expansion;
void aff_combination_const (aff_tree *, tree, const poly_widest_int &);
void aff_combination_elt (aff_tree *, tree, tree);
void aff_combination_scale (aff_tree *, const widest_int &);
void aff_combination_mult (aff_tree *, aff_tree *, aff_tree *);
void aff_combination_add (aff_tree *, aff_tree *);
void aff_combination_add_elt (aff_tree *, tree, const widest_int &);
void aff_combination_remove_elt (aff_tree *, unsigned);
void aff_combination_convert (aff_tree *, tree);
void tree_to_aff_combination (tree, tree, aff_tree *);
tree aff_combination_to_tree (aff_tree *);
void unshare_aff_combination (aff_tree *);
bool aff_combination_constant_multiple_p (aff_tree *, aff_tree *,
poly_widest_int *);
void aff_combination_expand (aff_tree *, hash_map<tree, name_expansion *> **);
void tree_to_aff_combination_expand (tree, tree, aff_tree *,
hash_map<tree, name_expansion *> **);
tree get_inner_reference_aff (tree, aff_tree *, poly_widest_int *);
void free_affine_expand_cache (hash_map<tree, name_expansion *> **);
bool aff_comb_cannot_overlap_p (aff_tree *, const poly_widest_int &,
const poly_widest_int &);
/* Debugging functions. */
void debug_aff (aff_tree *);
/* Return AFF's type. */
inline tree
aff_combination_type (aff_tree *aff)
{
return aff->type;
}
/* Return true if AFF is actually ZERO. */
inline bool
aff_combination_zero_p (aff_tree *aff)
{
if (!aff)
return true;
if (aff->n == 0 && known_eq (aff->offset, 0))
return true;
return false;
}
/* Return true if AFF is actually const. */
inline bool
aff_combination_const_p (aff_tree *aff)
{
return (aff == NULL || aff->n == 0);
}
/* Return true iff AFF contains one (negated) singleton variable. Users need
to make sure AFF points to a valid combination. */
inline bool
aff_combination_singleton_var_p (aff_tree *aff)
{
return (aff->n == 1
&& known_eq (aff->offset, 0)
&& (aff->elts[0].coef == 1 || aff->elts[0].coef == -1));
}
#endif /* GCC_TREE_AFFINE_H */
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