Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-chrec.h @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | 58ad6c70ea60 |
| children | f6334be47118 |
| 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 | |
|
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25 /* The following trees are unique elements. Thus the comparison of another |
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26 element to these elements should be done on the pointer to these trees, |
| 0 | 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); | |
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89 extern bool evolution_function_right_is_integer_cst (const_tree); |
| 0 | 90 |
| 91 /* Determines whether CHREC is equal to zero. */ | |
| 92 | |
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93 static inline bool |
| 0 | 94 chrec_zerop (const_tree chrec) |
| 95 { | |
| 96 if (chrec == NULL_TREE) | |
| 97 return false; | |
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98 |
| 0 | 99 if (TREE_CODE (chrec) == INTEGER_CST) |
| 100 return integer_zerop (chrec); | |
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101 |
| 0 | 102 return false; |
| 103 } | |
| 104 | |
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105 /* Determines whether CHREC is a loop invariant with respect to LOOP_NUM. |
| 0 | 106 Set the result in RES and return true when the property can be computed. */ |
| 107 | |
| 108 static inline bool | |
| 109 no_evolution_in_loop_p (tree chrec, unsigned loop_num, bool *res) | |
| 110 { | |
| 111 tree scev; | |
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112 |
| 0 | 113 if (chrec == chrec_not_analyzed_yet |
| 114 || chrec == chrec_dont_know | |
| 115 || chrec_contains_symbols_defined_in_loop (chrec, loop_num)) | |
| 116 return false; | |
| 117 | |
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118 STRIP_NOPS (chrec); |
| 0 | 119 scev = hide_evolution_in_other_loops_than_loop (chrec, loop_num); |
| 120 *res = !tree_is_chrec (scev); | |
| 121 return true; | |
| 122 } | |
| 123 | |
| 124 /* Build a polynomial chain of recurrence. */ | |
| 125 | |
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126 static inline tree |
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127 build_polynomial_chrec (unsigned loop_num, |
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128 tree left, |
| 0 | 129 tree right) |
| 130 { | |
| 131 bool val; | |
| 132 | |
| 133 if (left == chrec_dont_know | |
| 134 || right == chrec_dont_know) | |
| 135 return chrec_dont_know; | |
| 136 | |
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137 if (!no_evolution_in_loop_p (left, loop_num, &val) |
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138 || !val) |
| 0 | 139 return chrec_dont_know; |
| 140 | |
| 141 /* Pointer types should occur only on the left hand side, i.e. in | |
| 142 the base of the chrec, and not in the step. */ | |
| 143 gcc_assert (!POINTER_TYPE_P (TREE_TYPE (right))); | |
| 144 | |
| 145 /* Types of left and right sides of a chrec should be compatible. */ | |
| 146 if (POINTER_TYPE_P (TREE_TYPE (left))) | |
| 147 gcc_assert (sizetype == TREE_TYPE (right)); | |
| 148 else | |
| 149 gcc_assert (TREE_TYPE (left) == TREE_TYPE (right)); | |
| 150 | |
| 151 if (chrec_zerop (right)) | |
| 152 return left; | |
| 153 | |
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154 return build3 (POLYNOMIAL_CHREC, TREE_TYPE (left), |
| 0 | 155 build_int_cst (NULL_TREE, loop_num), left, right); |
| 156 } | |
| 157 | |
| 158 /* Determines whether the expression CHREC is a constant. */ | |
| 159 | |
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160 static inline bool |
| 0 | 161 evolution_function_is_constant_p (const_tree chrec) |
| 162 { | |
| 163 if (chrec == NULL_TREE) | |
| 164 return false; | |
| 165 | |
| 166 switch (TREE_CODE (chrec)) | |
| 167 { | |
| 168 case INTEGER_CST: | |
| 169 case REAL_CST: | |
| 170 return true; | |
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171 |
| 0 | 172 default: |
| 173 return false; | |
| 174 } | |
| 175 } | |
| 176 | |
| 177 /* Determine whether CHREC is an affine evolution function in LOOPNUM. */ | |
| 178 | |
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179 static inline bool |
| 0 | 180 evolution_function_is_affine_in_loop (const_tree chrec, int loopnum) |
| 181 { | |
| 182 if (chrec == NULL_TREE) | |
| 183 return false; | |
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184 |
| 0 | 185 switch (TREE_CODE (chrec)) |
| 186 { | |
| 187 case POLYNOMIAL_CHREC: | |
| 188 if (evolution_function_is_invariant_p (CHREC_LEFT (chrec), loopnum) | |
| 189 && evolution_function_is_invariant_p (CHREC_RIGHT (chrec), loopnum)) | |
| 190 return true; | |
| 191 else | |
| 192 return false; | |
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193 |
| 0 | 194 default: |
| 195 return false; | |
| 196 } | |
| 197 } | |
| 198 | |
| 199 /* Determine whether CHREC is an affine evolution function or not. */ | |
| 200 | |
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201 static inline bool |
| 0 | 202 evolution_function_is_affine_p (const_tree chrec) |
| 203 { | |
| 204 if (chrec == NULL_TREE) | |
| 205 return false; | |
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206 |
| 0 | 207 switch (TREE_CODE (chrec)) |
| 208 { | |
| 209 case POLYNOMIAL_CHREC: | |
| 210 if (evolution_function_is_invariant_p (CHREC_LEFT (chrec), | |
| 211 CHREC_VARIABLE (chrec)) | |
| 212 && evolution_function_is_invariant_p (CHREC_RIGHT (chrec), | |
| 213 CHREC_VARIABLE (chrec))) | |
| 214 return true; | |
| 215 else | |
| 216 return false; | |
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217 |
| 0 | 218 default: |
| 219 return false; | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 /* Determines whether EXPR does not contains chrec expressions. */ | |
| 224 | |
| 225 static inline bool | |
| 226 tree_does_not_contain_chrecs (const_tree expr) | |
| 227 { | |
| 228 return !tree_contains_chrecs (expr, NULL); | |
| 229 } | |
| 230 | |
| 231 /* Returns the type of the chrec. */ | |
| 232 | |
| 233 static inline tree | |
| 234 chrec_type (const_tree chrec) | |
| 235 { | |
| 236 if (automatically_generated_chrec_p (chrec)) | |
| 237 return NULL_TREE; | |
| 238 | |
| 239 return TREE_TYPE (chrec); | |
| 240 } | |
| 241 | |
| 242 static inline tree | |
| 243 chrec_fold_op (enum tree_code code, tree type, tree op0, tree op1) | |
| 244 { | |
| 245 switch (code) | |
| 246 { | |
| 247 case PLUS_EXPR: | |
| 248 return chrec_fold_plus (type, op0, op1); | |
| 249 | |
| 250 case MINUS_EXPR: | |
| 251 return chrec_fold_minus (type, op0, op1); | |
| 252 | |
| 253 case MULT_EXPR: | |
| 254 return chrec_fold_multiply (type, op0, op1); | |
| 255 | |
| 256 default: | |
| 257 gcc_unreachable (); | |
| 258 } | |
| 259 | |
| 260 } | |
| 261 | |
| 262 #endif /* GCC_TREE_CHREC_H */ |