251 lines
7.1 KiB
C
251 lines
7.1 KiB
C
|
/* Chains of recurrences.
|
|||
|
|
Copyright (C) 2003-2019 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 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/>. */
|
|||
|
|
|
|||
|
|
#ifndef GCC_TREE_CHREC_H
|
|||
|
|
#define GCC_TREE_CHREC_H
|
|||
|
|
|
|||
|
|
/* 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 (const_tree chrec)
|
|||
|
|
{
|
|||
|
|
return (chrec == chrec_dont_know
|
|||
|
|
|| chrec == chrec_known);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* The tree nodes aka. CHRECs. */
|
|||
|
|
|
|||
|
|
static inline bool
|
|||
|
|
tree_is_chrec (const_tree expr)
|
|||
|
|
{
|
|||
|
|
if (TREE_CODE (expr) == POLYNOMIAL_CHREC
|
|||
|
|
|| automatically_generated_chrec_p (expr))
|
|||
|
|
return true;
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
enum ev_direction {EV_DIR_GROWS, EV_DIR_DECREASES, EV_DIR_UNKNOWN};
|
|||
|
|
enum ev_direction scev_direction (const_tree);
|
|||
|
|
|
|||
|
|
/* 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, gimple *, bool = true, tree = NULL);
|
|||
|
|
extern tree chrec_convert_rhs (tree, tree, gimple *);
|
|||
|
|
extern tree chrec_convert_aggressive (tree, tree, bool *);
|
|||
|
|
|
|||
|
|
/* Operations. */
|
|||
|
|
extern tree chrec_apply (unsigned, tree, tree);
|
|||
|
|
extern tree chrec_apply_map (tree, vec<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);
|
|||
|
|
extern void for_each_scev_op (tree *, bool (*) (tree *, void *), void *);
|
|||
|
|
extern bool convert_affine_scev (struct loop *, tree, tree *, tree *, gimple *,
|
|||
|
|
bool, tree = NULL);
|
|||
|
|
|
|||
|
|
/* Observers. */
|
|||
|
|
extern bool eq_evolutions_p (const_tree, const_tree);
|
|||
|
|
extern bool is_multivariate_chrec (const_tree);
|
|||
|
|
extern bool chrec_contains_symbols (const_tree, struct loop * = NULL);
|
|||
|
|
extern bool chrec_contains_symbols_defined_in_loop (const_tree, unsigned);
|
|||
|
|
extern bool chrec_contains_undetermined (const_tree);
|
|||
|
|
extern bool tree_contains_chrecs (const_tree, int *);
|
|||
|
|
extern bool evolution_function_is_affine_multivariate_p (const_tree, int);
|
|||
|
|
extern bool evolution_function_is_univariate_p (const_tree, int = 0);
|
|||
|
|
extern unsigned nb_vars_in_chrec (tree);
|
|||
|
|
extern bool evolution_function_is_invariant_p (tree, int);
|
|||
|
|
extern bool scev_is_linear_expression (tree);
|
|||
|
|
extern bool evolution_function_right_is_integer_cst (const_tree);
|
|||
|
|
|
|||
|
|
/* Determines whether CHREC is equal to zero. */
|
|||
|
|
|
|||
|
|
static inline bool
|
|||
|
|
chrec_zerop (const_tree chrec)
|
|||
|
|
{
|
|||
|
|
if (chrec == NULL_TREE)
|
|||
|
|
return false;
|
|||
|
|
|
|||
|
|
if (TREE_CODE (chrec) == INTEGER_CST)
|
|||
|
|
return integer_zerop (chrec);
|
|||
|
|
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* 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;
|
|||
|
|
|
|||
|
|
STRIP_NOPS (chrec);
|
|||
|
|
scev = hide_evolution_in_other_loops_than_loop (chrec, loop_num);
|
|||
|
|
*res = !tree_contains_chrecs (scev, NULL);
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* Build a polynomial chain of recurrence. */
|
|||
|
|
|
|||
|
|
static inline tree
|
|||
|
|
build_polynomial_chrec (unsigned loop_num,
|
|||
|
|
tree left,
|
|||
|
|
tree right)
|
|||
|
|
{
|
|||
|
|
bool val;
|
|||
|
|
|
|||
|
|
if (left == chrec_dont_know
|
|||
|
|
|| right == chrec_dont_know)
|
|||
|
|
return chrec_dont_know;
|
|||
|
|
|
|||
|
|
if (!no_evolution_in_loop_p (left, loop_num, &val)
|
|||
|
|
|| !val)
|
|||
|
|
return chrec_dont_know;
|
|||
|
|
|
|||
|
|
/* Types of left and right sides of a chrec should be compatible, but
|
|||
|
|
pointer CHRECs are special in that the evolution is of ptroff type. */
|
|||
|
|
if (POINTER_TYPE_P (TREE_TYPE (left)))
|
|||
|
|
gcc_checking_assert (ptrofftype_p (TREE_TYPE (right)));
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
/* Pointer types should occur only on the left hand side, i.e. in
|
|||
|
|
the base of the chrec, and not in the step. */
|
|||
|
|
gcc_checking_assert (!POINTER_TYPE_P (TREE_TYPE (right))
|
|||
|
|
&& types_compatible_p (TREE_TYPE (left),
|
|||
|
|
TREE_TYPE (right)));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (chrec_zerop (right))
|
|||
|
|
return left;
|
|||
|
|
|
|||
|
|
tree chrec = build2 (POLYNOMIAL_CHREC, TREE_TYPE (left), left, right);
|
|||
|
|
CHREC_VARIABLE (chrec) = loop_num;
|
|||
|
|
return chrec;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* Determines whether the expression CHREC is a constant. */
|
|||
|
|
|
|||
|
|
static inline bool
|
|||
|
|
evolution_function_is_constant_p (const_tree chrec)
|
|||
|
|
{
|
|||
|
|
if (chrec == NULL_TREE)
|
|||
|
|
return false;
|
|||
|
|
|
|||
|
|
return is_gimple_min_invariant (chrec);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* Determine whether CHREC is an affine evolution function in LOOPNUM. */
|
|||
|
|
|
|||
|
|
static inline bool
|
|||
|
|
evolution_function_is_affine_in_loop (const_tree chrec, int loopnum)
|
|||
|
|
{
|
|||
|
|
if (chrec == NULL_TREE)
|
|||
|
|
return false;
|
|||
|
|
|
|||
|
|
switch (TREE_CODE (chrec))
|
|||
|
|
{
|
|||
|
|
case POLYNOMIAL_CHREC:
|
|||
|
|
if (evolution_function_is_invariant_p (CHREC_LEFT (chrec), loopnum)
|
|||
|
|
&& evolution_function_is_invariant_p (CHREC_RIGHT (chrec), loopnum))
|
|||
|
|
return true;
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
|
|||
|
|
default:
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* Determine whether CHREC is an affine evolution function or not. */
|
|||
|
|
|
|||
|
|
static inline bool
|
|||
|
|
evolution_function_is_affine_p (const_tree chrec)
|
|||
|
|
{
|
|||
|
|
return chrec
|
|||
|
|
&& TREE_CODE (chrec) == POLYNOMIAL_CHREC
|
|||
|
|
&& evolution_function_is_invariant_p (CHREC_RIGHT (chrec),
|
|||
|
|
CHREC_VARIABLE (chrec))
|
|||
|
|
&& (TREE_CODE (CHREC_RIGHT (chrec)) != POLYNOMIAL_CHREC
|
|||
|
|
|| evolution_function_is_affine_p (CHREC_RIGHT (chrec)));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* Determines whether EXPR does not contains chrec expressions. */
|
|||
|
|
|
|||
|
|
static inline bool
|
|||
|
|
tree_does_not_contain_chrecs (const_tree expr)
|
|||
|
|
{
|
|||
|
|
return !tree_contains_chrecs (expr, NULL);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* Returns the type of the chrec. */
|
|||
|
|
|
|||
|
|
static inline tree
|
|||
|
|
chrec_type (const_tree chrec)
|
|||
|
|
{
|
|||
|
|
if (automatically_generated_chrec_p (chrec))
|
|||
|
|
return NULL_TREE;
|
|||
|
|
|
|||
|
|
return TREE_TYPE (chrec);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
static inline tree
|
|||
|
|
chrec_fold_op (enum tree_code code, tree type, tree op0, tree op1)
|
|||
|
|
{
|
|||
|
|
switch (code)
|
|||
|
|
{
|
|||
|
|
case PLUS_EXPR:
|
|||
|
|
return chrec_fold_plus (type, op0, op1);
|
|||
|
|
|
|||
|
|
case MINUS_EXPR:
|
|||
|
|
return chrec_fold_minus (type, op0, op1);
|
|||
|
|
|
|||
|
|
case MULT_EXPR:
|
|||
|
|
return chrec_fold_multiply (type, op0, op1);
|
|||
|
|
|
|||
|
|
default:
|
|||
|
|
gcc_unreachable ();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#endif /* GCC_TREE_CHREC_H */
|