60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
/* Support routines for Value Range Propagation (VRP).
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Copyright (C) 2016-2017 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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/* Type of value ranges. See value_range_d In tree-vrp.c for a
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description of these types. */
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enum value_range_type { VR_UNDEFINED, VR_RANGE,
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VR_ANTI_RANGE, VR_VARYING, VR_LAST };
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/* Range of values that can be associated with an SSA_NAME after VRP
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has executed. */
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struct GTY(()) value_range
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{
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/* Lattice value represented by this range. */
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enum value_range_type type;
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/* Minimum and maximum values represented by this range. These
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values should be interpreted as follows:
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- If TYPE is VR_UNDEFINED or VR_VARYING then MIN and MAX must
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be NULL.
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- If TYPE == VR_RANGE then MIN holds the minimum value and
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MAX holds the maximum value of the range [MIN, MAX].
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- If TYPE == ANTI_RANGE the variable is known to NOT
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take any values in the range [MIN, MAX]. */
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tree min;
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tree max;
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/* Set of SSA names whose value ranges are equivalent to this one.
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This set is only valid when TYPE is VR_RANGE or VR_ANTI_RANGE. */
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bitmap equiv;
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};
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extern void vrp_intersect_ranges (value_range *vr0, value_range *vr1);
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extern void vrp_meet (value_range *vr0, const value_range *vr1);
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extern void dump_value_range (FILE *, const value_range *);
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extern void extract_range_from_unary_expr (value_range *vr,
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enum tree_code code,
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tree type,
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value_range *vr0_,
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tree op0_type);
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