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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/>. */
/* Type of value ranges. See value_range_d In tree-vrp.c 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(()) 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);
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