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/* Support routines for Value Range Propagation (VRP).
Copyright (C) 2016-2017 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/>. */
#ifndef GCC_TREE_VRP_H
#define GCC_TREE_VRP_H
/* Type of value ranges. See value_range below for a
description of these types. */
enum value_range_type { VR_UNDEFINED, VR_RANGE,
VR_ANTI_RANGE, VR_VARYING, VR_LAST };
/* Range of values that can be associated with an SSA_NAME after VRP
has executed. */
struct GTY((for_user)) value_range
{
/* Lattice value represented by this range. */
enum value_range_type type;
/* Minimum and maximum values represented by this range. These
values should be interpreted as follows:
- If TYPE is VR_UNDEFINED or VR_VARYING then MIN and MAX must
be NULL.
- If TYPE == VR_RANGE then MIN holds the minimum value and
MAX holds the maximum value of the range [MIN, MAX].
- If TYPE == ANTI_RANGE the variable is known to NOT
take any values in the range [MIN, MAX]. */
tree min;
tree max;
/* Set of SSA names whose value ranges are equivalent to this one.
This set is only valid when TYPE is VR_RANGE or VR_ANTI_RANGE. */
bitmap equiv;
};
extern void vrp_intersect_ranges (value_range *vr0, value_range *vr1);
extern void vrp_meet (value_range *vr0, const value_range *vr1);
extern void dump_value_range (FILE *, const value_range *);
extern void extract_range_from_unary_expr (value_range *vr,
enum tree_code code,
tree type,
value_range *vr0_,
tree op0_type);
extern bool vrp_operand_equal_p (const_tree, const_tree);
struct assert_info
{
/* Predicate code for the ASSERT_EXPR. Must be COMPARISON_CLASS_P. */
enum tree_code comp_code;
/* Name to register the assert for. */
tree name;
/* Value being compared against. */
tree val;
/* Expression to compare. */
tree expr;
};
extern void register_edge_assert_for (tree, edge, enum tree_code,
tree, tree, vec<assert_info> &);
extern bool stmt_interesting_for_vrp (gimple *);
extern void set_value_range_to_varying (value_range *);
extern int range_includes_zero_p (tree, tree);
extern bool infer_value_range (gimple *, tree, tree_code *, tree *);
#endif /* GCC_TREE_VRP_H */
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