Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-chrec.h @ 37:d096b2ff82d9
Added tag gcc.4.4.2 for changeset 855418dad1a3
| author | e075725 |
|---|---|
| date | Tue, 22 Dec 2009 21:52:56 +0900 |
| parents | 58ad6c70ea60 |
| children | 77e2b8dfacca |
| rev | line source |
|---|---|
| 0 | 1 /* Chains of recurrences. |
| 2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 | |
| 3 Free Software Foundation, Inc. | |
| 4 Contributed by Sebastian Pop <pop@cri.ensmp.fr> | |
| 5 | |
| 6 This file is part of GCC. | |
| 7 | |
| 8 GCC is free software; you can redistribute it and/or modify it under | |
| 9 the terms of the GNU General Public License as published by the Free | |
| 10 Software Foundation; either version 3, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
| 22 #ifndef GCC_TREE_CHREC_H | |
| 23 #define GCC_TREE_CHREC_H | |
| 24 | |
| 25 /* The following trees are unique elements. Thus the comparison of another | |
| 26 element to these elements should be done on the pointer to these trees, | |
| 27 and not on their value. */ | |
| 28 | |
| 29 extern tree chrec_not_analyzed_yet; | |
| 30 extern GTY(()) tree chrec_dont_know; | |
| 31 extern GTY(()) tree chrec_known; | |
| 32 | |
| 33 /* After having added an automatically generated element, please | |
| 34 include it in the following function. */ | |
| 35 | |
| 36 static inline bool | |
| 37 automatically_generated_chrec_p (const_tree chrec) | |
| 38 { | |
| 39 return (chrec == chrec_dont_know | |
| 40 || chrec == chrec_known); | |
| 41 } | |
| 42 | |
| 43 /* The tree nodes aka. CHRECs. */ | |
| 44 | |
| 45 static inline bool | |
| 46 tree_is_chrec (const_tree expr) | |
| 47 { | |
| 48 if (TREE_CODE (expr) == POLYNOMIAL_CHREC | |
| 49 || automatically_generated_chrec_p (expr)) | |
| 50 return true; | |
| 51 else | |
| 52 return false; | |
| 53 } | |
| 54 | |
| 55 | |
| 56 | |
| 57 /* Chrec folding functions. */ | |
| 58 extern tree chrec_fold_plus (tree, tree, tree); | |
| 59 extern tree chrec_fold_minus (tree, tree, tree); | |
| 60 extern tree chrec_fold_multiply (tree, tree, tree); | |
| 61 extern tree chrec_convert (tree, tree, gimple); | |
| 62 extern tree chrec_convert_rhs (tree, tree, gimple); | |
| 63 extern tree chrec_convert_aggressive (tree, tree); | |
| 64 | |
| 65 /* Operations. */ | |
| 66 extern tree chrec_apply (unsigned, tree, tree); | |
| 67 extern tree chrec_replace_initial_condition (tree, tree); | |
| 68 extern tree initial_condition (tree); | |
| 69 extern tree initial_condition_in_loop_num (tree, unsigned); | |
| 70 extern tree evolution_part_in_loop_num (tree, unsigned); | |
| 71 extern tree hide_evolution_in_other_loops_than_loop (tree, unsigned); | |
| 72 extern tree reset_evolution_in_loop (unsigned, tree, tree); | |
| 73 extern tree chrec_merge (tree, tree); | |
| 74 extern void for_each_scev_op (tree *, bool (*) (tree *, void *), void *); | |
| 75 | |
| 76 /* Observers. */ | |
| 77 extern bool eq_evolutions_p (const_tree, const_tree); | |
| 78 extern bool is_multivariate_chrec (const_tree); | |
| 79 extern bool chrec_is_positive (tree, bool *); | |
| 80 extern bool chrec_contains_symbols (const_tree); | |
| 81 extern bool chrec_contains_symbols_defined_in_loop (const_tree, unsigned); | |
| 82 extern bool chrec_contains_undetermined (const_tree); | |
| 83 extern bool tree_contains_chrecs (const_tree, int *); | |
| 84 extern bool evolution_function_is_affine_multivariate_p (const_tree, int); | |
| 85 extern bool evolution_function_is_univariate_p (const_tree); | |
| 86 extern unsigned nb_vars_in_chrec (tree); | |
| 87 extern bool evolution_function_is_invariant_p (tree, int); | |
| 88 extern bool scev_is_linear_expression (tree); | |
| 89 | |
| 90 /* Determines whether CHREC is equal to zero. */ | |
| 91 | |
| 92 static inline bool | |
| 93 chrec_zerop (const_tree chrec) | |
| 94 { | |
| 95 if (chrec == NULL_TREE) | |
| 96 return false; | |
| 97 | |
| 98 if (TREE_CODE (chrec) == INTEGER_CST) | |
| 99 return integer_zerop (chrec); | |
| 100 | |
| 101 return false; | |
| 102 } | |
| 103 | |
| 104 /* Determines whether CHREC is a loop invariant with respect to LOOP_NUM. | |
| 105 Set the result in RES and return true when the property can be computed. */ | |
| 106 | |
| 107 static inline bool | |
| 108 no_evolution_in_loop_p (tree chrec, unsigned loop_num, bool *res) | |
| 109 { | |
| 110 tree scev; | |
| 111 | |
| 112 if (chrec == chrec_not_analyzed_yet | |
| 113 || chrec == chrec_dont_know | |
| 114 || chrec_contains_symbols_defined_in_loop (chrec, loop_num)) | |
| 115 return false; | |
| 116 | |
| 117 scev = hide_evolution_in_other_loops_than_loop (chrec, loop_num); | |
| 118 *res = !tree_is_chrec (scev); | |
| 119 return true; | |
| 120 } | |
| 121 | |
| 122 /* Build a polynomial chain of recurrence. */ | |
| 123 | |
| 124 static inline tree | |
| 125 build_polynomial_chrec (unsigned loop_num, | |
| 126 tree left, | |
| 127 tree right) | |
| 128 { | |
| 129 bool val; | |
| 130 | |
| 131 if (left == chrec_dont_know | |
| 132 || right == chrec_dont_know) | |
| 133 return chrec_dont_know; | |
| 134 | |
|
19
58ad6c70ea60
update gcc from 4.4.0 to 4.4.1.
kent@firefly.cr.ie.u-ryukyu.ac.jp
parents:
0
diff
changeset
|
135 if (!no_evolution_in_loop_p (left, loop_num, &val) |
|
58ad6c70ea60
update gcc from 4.4.0 to 4.4.1.
kent@firefly.cr.ie.u-ryukyu.ac.jp
parents:
0
diff
changeset
|
136 || !val) |
| 0 | 137 return chrec_dont_know; |
| 138 | |
| 139 /* Pointer types should occur only on the left hand side, i.e. in | |
| 140 the base of the chrec, and not in the step. */ | |
| 141 gcc_assert (!POINTER_TYPE_P (TREE_TYPE (right))); | |
| 142 | |
| 143 /* Types of left and right sides of a chrec should be compatible. */ | |
| 144 if (POINTER_TYPE_P (TREE_TYPE (left))) | |
| 145 gcc_assert (sizetype == TREE_TYPE (right)); | |
| 146 else | |
| 147 gcc_assert (TREE_TYPE (left) == TREE_TYPE (right)); | |
| 148 | |
| 149 if (chrec_zerop (right)) | |
| 150 return left; | |
| 151 | |
| 152 return build3 (POLYNOMIAL_CHREC, TREE_TYPE (left), | |
| 153 build_int_cst (NULL_TREE, loop_num), left, right); | |
| 154 } | |
| 155 | |
| 156 /* Determines whether the expression CHREC is a constant. */ | |
| 157 | |
| 158 static inline bool | |
| 159 evolution_function_is_constant_p (const_tree chrec) | |
| 160 { | |
| 161 if (chrec == NULL_TREE) | |
| 162 return false; | |
| 163 | |
| 164 switch (TREE_CODE (chrec)) | |
| 165 { | |
| 166 case INTEGER_CST: | |
| 167 case REAL_CST: | |
| 168 return true; | |
| 169 | |
| 170 default: | |
| 171 return false; | |
| 172 } | |
| 173 } | |
| 174 | |
| 175 /* Determine whether CHREC is an affine evolution function in LOOPNUM. */ | |
| 176 | |
| 177 static inline bool | |
| 178 evolution_function_is_affine_in_loop (const_tree chrec, int loopnum) | |
| 179 { | |
| 180 if (chrec == NULL_TREE) | |
| 181 return false; | |
| 182 | |
| 183 switch (TREE_CODE (chrec)) | |
| 184 { | |
| 185 case POLYNOMIAL_CHREC: | |
| 186 if (evolution_function_is_invariant_p (CHREC_LEFT (chrec), loopnum) | |
| 187 && evolution_function_is_invariant_p (CHREC_RIGHT (chrec), loopnum)) | |
| 188 return true; | |
| 189 else | |
| 190 return false; | |
| 191 | |
| 192 default: | |
| 193 return false; | |
| 194 } | |
| 195 } | |
| 196 | |
| 197 /* Determine whether CHREC is an affine evolution function or not. */ | |
| 198 | |
| 199 static inline bool | |
| 200 evolution_function_is_affine_p (const_tree chrec) | |
| 201 { | |
| 202 if (chrec == NULL_TREE) | |
| 203 return false; | |
| 204 | |
| 205 switch (TREE_CODE (chrec)) | |
| 206 { | |
| 207 case POLYNOMIAL_CHREC: | |
| 208 if (evolution_function_is_invariant_p (CHREC_LEFT (chrec), | |
| 209 CHREC_VARIABLE (chrec)) | |
| 210 && evolution_function_is_invariant_p (CHREC_RIGHT (chrec), | |
| 211 CHREC_VARIABLE (chrec))) | |
| 212 return true; | |
| 213 else | |
| 214 return false; | |
| 215 | |
| 216 default: | |
| 217 return false; | |
| 218 } | |
| 219 } | |
| 220 | |
| 221 /* Determines whether EXPR does not contains chrec expressions. */ | |
| 222 | |
| 223 static inline bool | |
| 224 tree_does_not_contain_chrecs (const_tree expr) | |
| 225 { | |
| 226 return !tree_contains_chrecs (expr, NULL); | |
| 227 } | |
| 228 | |
| 229 /* Returns the type of the chrec. */ | |
| 230 | |
| 231 static inline tree | |
| 232 chrec_type (const_tree chrec) | |
| 233 { | |
| 234 if (automatically_generated_chrec_p (chrec)) | |
| 235 return NULL_TREE; | |
| 236 | |
| 237 return TREE_TYPE (chrec); | |
| 238 } | |
| 239 | |
| 240 static inline tree | |
| 241 chrec_fold_op (enum tree_code code, tree type, tree op0, tree op1) | |
| 242 { | |
| 243 switch (code) | |
| 244 { | |
| 245 case PLUS_EXPR: | |
| 246 return chrec_fold_plus (type, op0, op1); | |
| 247 | |
| 248 case MINUS_EXPR: | |
| 249 return chrec_fold_minus (type, op0, op1); | |
| 250 | |
| 251 case MULT_EXPR: | |
| 252 return chrec_fold_multiply (type, op0, op1); | |
| 253 | |
| 254 default: | |
| 255 gcc_unreachable (); | |
| 256 } | |
| 257 | |
| 258 } | |
| 259 | |
| 260 #endif /* GCC_TREE_CHREC_H */ |