1 /* Support routines for Value Range Propagation (VRP). 2 Copyright (C) 2016-2017 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 GCC is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 /* Type of value ranges. See value_range_d In tree-vrp.c for a 21 description of these types. */ 22 enum value_range_type { VR_UNDEFINED, VR_RANGE, 23 VR_ANTI_RANGE, VR_VARYING, VR_LAST }; 24 25 /* Range of values that can be associated with an SSA_NAME after VRP 26 has executed. */ 27 struct GTY((for_user)) value_range 28 { 29 /* Lattice value represented by this range. */ 30 enum value_range_type type; 31 32 /* Minimum and maximum values represented by this range. These 33 values should be interpreted as follows: 34 35 - If TYPE is VR_UNDEFINED or VR_VARYING then MIN and MAX must 36 be NULL. 37 38 - If TYPE == VR_RANGE then MIN holds the minimum value and 39 MAX holds the maximum value of the range [MIN, MAX]. 40 41 - If TYPE == ANTI_RANGE the variable is known to NOT 42 take any values in the range [MIN, MAX]. */ 43 tree min; 44 tree max; 45 46 /* Set of SSA names whose value ranges are equivalent to this one. 47 This set is only valid when TYPE is VR_RANGE or VR_ANTI_RANGE. */ 48 bitmap equiv; 49 }; 50 51 extern void vrp_intersect_ranges (value_range *vr0, value_range *vr1); 52 extern void vrp_meet (value_range *vr0, const value_range *vr1); 53 extern void dump_value_range (FILE *, const value_range *); 54 extern void extract_range_from_unary_expr (value_range *vr, 55 enum tree_code code, 56 tree type, 57 value_range *vr0_, 58 tree op0_type); 59 60