Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-chrec.h @ 158:494b0b89df80 default tip
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author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Mon, 25 May 2020 18:13:55 +0900 |
parents | 1830386684a0 |
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rev | line source |
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0 | 1 /* Chains of recurrences. |
145 | 2 Copyright (C) 2003-2020 Free Software Foundation, Inc. |
0 | 3 Contributed by Sebastian Pop <pop@cri.ensmp.fr> |
4 | |
5 This file is part of GCC. | |
6 | |
7 GCC is free software; you can redistribute it and/or modify it under | |
8 the terms of the GNU General Public License as published by the Free | |
9 Software Foundation; either version 3, or (at your option) any later | |
10 version. | |
11 | |
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 #ifndef GCC_TREE_CHREC_H | |
22 #define GCC_TREE_CHREC_H | |
23 | |
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24 /* The following trees are unique elements. Thus the comparison of another |
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25 element to these elements should be done on the pointer to these trees, |
145 | 26 and not on their value. |
0 | 27 |
145 | 28 extern tree chrec_not_analyzed_yet; |
29 extern tree chrec_dont_know; | |
30 extern tree chrec_known; | |
31 | |
32 chrec_not_analyzed_yet is NULL_TREE and the others are defined | |
33 in global_trees[]. */ | |
0 | 34 |
35 /* After having added an automatically generated element, please | |
36 include it in the following function. */ | |
37 | |
38 static inline bool | |
39 automatically_generated_chrec_p (const_tree chrec) | |
40 { | |
41 return (chrec == chrec_dont_know | |
42 || chrec == chrec_known); | |
43 } | |
44 | |
45 /* The tree nodes aka. CHRECs. */ | |
46 | |
47 static inline bool | |
48 tree_is_chrec (const_tree expr) | |
49 { | |
50 if (TREE_CODE (expr) == POLYNOMIAL_CHREC | |
51 || automatically_generated_chrec_p (expr)) | |
52 return true; | |
53 else | |
54 return false; | |
55 } | |
56 | |
57 | |
111 | 58 enum ev_direction {EV_DIR_GROWS, EV_DIR_DECREASES, EV_DIR_UNKNOWN}; |
59 enum ev_direction scev_direction (const_tree); | |
0 | 60 |
61 /* Chrec folding functions. */ | |
62 extern tree chrec_fold_plus (tree, tree, tree); | |
63 extern tree chrec_fold_minus (tree, tree, tree); | |
64 extern tree chrec_fold_multiply (tree, tree, tree); | |
111 | 65 extern tree chrec_convert (tree, tree, gimple *, bool = true, tree = NULL); |
66 extern tree chrec_convert_rhs (tree, tree, gimple *); | |
67 extern tree chrec_convert_aggressive (tree, tree, bool *); | |
0 | 68 |
69 /* Operations. */ | |
70 extern tree chrec_apply (unsigned, tree, tree); | |
111 | 71 extern tree chrec_apply_map (tree, vec<tree> ); |
0 | 72 extern tree chrec_replace_initial_condition (tree, tree); |
73 extern tree initial_condition (tree); | |
74 extern tree initial_condition_in_loop_num (tree, unsigned); | |
75 extern tree evolution_part_in_loop_num (tree, unsigned); | |
76 extern tree hide_evolution_in_other_loops_than_loop (tree, unsigned); | |
77 extern tree reset_evolution_in_loop (unsigned, tree, tree); | |
78 extern tree chrec_merge (tree, tree); | |
79 extern void for_each_scev_op (tree *, bool (*) (tree *, void *), void *); | |
145 | 80 extern bool convert_affine_scev (class loop *, tree, tree *, tree *, gimple *, |
111 | 81 bool, tree = NULL); |
0 | 82 |
83 /* Observers. */ | |
84 extern bool eq_evolutions_p (const_tree, const_tree); | |
85 extern bool is_multivariate_chrec (const_tree); | |
145 | 86 extern bool chrec_contains_symbols (const_tree, class loop * = NULL); |
0 | 87 extern bool chrec_contains_symbols_defined_in_loop (const_tree, unsigned); |
88 extern bool chrec_contains_undetermined (const_tree); | |
89 extern bool tree_contains_chrecs (const_tree, int *); | |
90 extern bool evolution_function_is_affine_multivariate_p (const_tree, int); | |
145 | 91 extern bool evolution_function_is_univariate_p (const_tree, int = 0); |
0 | 92 extern unsigned nb_vars_in_chrec (tree); |
93 extern bool evolution_function_is_invariant_p (tree, int); | |
94 extern bool scev_is_linear_expression (tree); | |
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95 extern bool evolution_function_right_is_integer_cst (const_tree); |
0 | 96 |
97 /* Determines whether CHREC is equal to zero. */ | |
98 | |
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99 static inline bool |
0 | 100 chrec_zerop (const_tree chrec) |
101 { | |
102 if (chrec == NULL_TREE) | |
103 return false; | |
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104 |
0 | 105 if (TREE_CODE (chrec) == INTEGER_CST) |
106 return integer_zerop (chrec); | |
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107 |
0 | 108 return false; |
109 } | |
110 | |
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111 /* Determines whether CHREC is a loop invariant with respect to LOOP_NUM. |
0 | 112 Set the result in RES and return true when the property can be computed. */ |
113 | |
114 static inline bool | |
115 no_evolution_in_loop_p (tree chrec, unsigned loop_num, bool *res) | |
116 { | |
117 tree scev; | |
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118 |
0 | 119 if (chrec == chrec_not_analyzed_yet |
120 || chrec == chrec_dont_know | |
121 || chrec_contains_symbols_defined_in_loop (chrec, loop_num)) | |
122 return false; | |
123 | |
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124 STRIP_NOPS (chrec); |
0 | 125 scev = hide_evolution_in_other_loops_than_loop (chrec, loop_num); |
111 | 126 *res = !tree_contains_chrecs (scev, NULL); |
0 | 127 return true; |
128 } | |
129 | |
130 /* Build a polynomial chain of recurrence. */ | |
131 | |
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132 static inline tree |
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133 build_polynomial_chrec (unsigned loop_num, |
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134 tree left, |
0 | 135 tree right) |
136 { | |
137 bool val; | |
138 | |
139 if (left == chrec_dont_know | |
140 || right == chrec_dont_know) | |
141 return chrec_dont_know; | |
142 | |
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143 if (!no_evolution_in_loop_p (left, loop_num, &val) |
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144 || !val) |
0 | 145 return chrec_dont_know; |
146 | |
111 | 147 /* Types of left and right sides of a chrec should be compatible, but |
148 pointer CHRECs are special in that the evolution is of ptroff type. */ | |
0 | 149 if (POINTER_TYPE_P (TREE_TYPE (left))) |
111 | 150 gcc_checking_assert (ptrofftype_p (TREE_TYPE (right))); |
0 | 151 else |
111 | 152 { |
153 /* Pointer types should occur only on the left hand side, i.e. in | |
154 the base of the chrec, and not in the step. */ | |
155 gcc_checking_assert (!POINTER_TYPE_P (TREE_TYPE (right)) | |
156 && types_compatible_p (TREE_TYPE (left), | |
157 TREE_TYPE (right))); | |
158 } | |
0 | 159 |
160 if (chrec_zerop (right)) | |
161 return left; | |
162 | |
111 | 163 tree chrec = build2 (POLYNOMIAL_CHREC, TREE_TYPE (left), left, right); |
164 CHREC_VARIABLE (chrec) = loop_num; | |
165 return chrec; | |
0 | 166 } |
167 | |
168 /* Determines whether the expression CHREC is a constant. */ | |
169 | |
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170 static inline bool |
0 | 171 evolution_function_is_constant_p (const_tree chrec) |
172 { | |
173 if (chrec == NULL_TREE) | |
174 return false; | |
175 | |
111 | 176 return is_gimple_min_invariant (chrec); |
0 | 177 } |
178 | |
179 /* Determine whether CHREC is an affine evolution function in LOOPNUM. */ | |
180 | |
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181 static inline bool |
0 | 182 evolution_function_is_affine_in_loop (const_tree chrec, int loopnum) |
183 { | |
184 if (chrec == NULL_TREE) | |
185 return false; | |
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186 |
0 | 187 switch (TREE_CODE (chrec)) |
188 { | |
189 case POLYNOMIAL_CHREC: | |
190 if (evolution_function_is_invariant_p (CHREC_LEFT (chrec), loopnum) | |
191 && evolution_function_is_invariant_p (CHREC_RIGHT (chrec), loopnum)) | |
192 return true; | |
193 else | |
194 return false; | |
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195 |
0 | 196 default: |
197 return false; | |
198 } | |
199 } | |
200 | |
201 /* Determine whether CHREC is an affine evolution function or not. */ | |
202 | |
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203 static inline bool |
0 | 204 evolution_function_is_affine_p (const_tree chrec) |
205 { | |
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206 return chrec |
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207 && TREE_CODE (chrec) == POLYNOMIAL_CHREC |
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208 && evolution_function_is_invariant_p (CHREC_RIGHT (chrec), |
111 | 209 CHREC_VARIABLE (chrec)) |
210 && (TREE_CODE (CHREC_RIGHT (chrec)) != POLYNOMIAL_CHREC | |
211 || evolution_function_is_affine_p (CHREC_RIGHT (chrec))); | |
0 | 212 } |
213 | |
214 /* Determines whether EXPR does not contains chrec expressions. */ | |
215 | |
216 static inline bool | |
217 tree_does_not_contain_chrecs (const_tree expr) | |
218 { | |
219 return !tree_contains_chrecs (expr, NULL); | |
220 } | |
221 | |
222 /* Returns the type of the chrec. */ | |
223 | |
224 static inline tree | |
225 chrec_type (const_tree chrec) | |
226 { | |
227 if (automatically_generated_chrec_p (chrec)) | |
228 return NULL_TREE; | |
229 | |
230 return TREE_TYPE (chrec); | |
231 } | |
232 | |
233 static inline tree | |
234 chrec_fold_op (enum tree_code code, tree type, tree op0, tree op1) | |
235 { | |
236 switch (code) | |
237 { | |
238 case PLUS_EXPR: | |
239 return chrec_fold_plus (type, op0, op1); | |
240 | |
241 case MINUS_EXPR: | |
242 return chrec_fold_minus (type, op0, op1); | |
243 | |
244 case MULT_EXPR: | |
245 return chrec_fold_multiply (type, op0, op1); | |
246 | |
247 default: | |
248 gcc_unreachable (); | |
249 } | |
250 | |
251 } | |
252 | |
253 #endif /* GCC_TREE_CHREC_H */ |