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9e9e6e3e | 1 | /* Tree SCC value numbering |
aad93da1 | 2 | Copyright (C) 2007-2017 Free Software Foundation, Inc. |
9e9e6e3e | 3 | Contributed by Daniel Berlin <dberlin@dberlin.org> |
4 | ||
8c4c00c1 | 5 | This file is part of GCC. |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify | |
8 | under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License 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/>. */ | |
9e9e6e3e | 20 | |
21 | #ifndef TREE_SSA_SCCVN_H | |
22 | #define TREE_SSA_SCCVN_H | |
23 | ||
d8eaff30 | 24 | /* In tree-ssa-sccvn.c */ |
25 | bool expressions_equal_p (tree, tree); | |
26 | ||
27 | ||
9e9e6e3e | 28 | /* TOP of the VN lattice. */ |
29 | extern tree VN_TOP; | |
30 | ||
f6c33c78 | 31 | /* N-ary operations in the hashtable consist of length operands, an |
32 | opcode, and a type. Result is the value number of the operation, | |
33 | and hashcode is stored to avoid having to calculate it | |
34 | repeatedly. */ | |
35 | ||
36 | typedef struct vn_nary_op_s | |
37 | { | |
38 | /* Unique identify that all expressions with the same value have. */ | |
39 | unsigned int value_id; | |
40 | ENUM_BITFIELD(tree_code) opcode : 16; | |
41 | unsigned length : 16; | |
42 | hashval_t hashcode; | |
43 | tree result; | |
44 | tree type; | |
7384c678 | 45 | tree op[1]; |
f6c33c78 | 46 | } *vn_nary_op_t; |
47 | typedef const struct vn_nary_op_s *const_vn_nary_op_t; | |
48 | ||
7384c678 | 49 | /* Return the size of a vn_nary_op_t with LENGTH operands. */ |
50 | ||
51 | static inline size_t | |
52 | sizeof_vn_nary_op (unsigned int length) | |
53 | { | |
70cd63a3 | 54 | return sizeof (struct vn_nary_op_s) + sizeof (tree) * length - sizeof (tree); |
7384c678 | 55 | } |
56 | ||
f6c33c78 | 57 | /* Phi nodes in the hashtable consist of their non-VN_TOP phi |
58 | arguments, and the basic block the phi is in. Result is the value | |
59 | number of the operation, and hashcode is stored to avoid having to | |
60 | calculate it repeatedly. Phi nodes not in the same block are never | |
61 | considered equivalent. */ | |
62 | ||
63 | typedef struct vn_phi_s | |
64 | { | |
65 | /* Unique identifier that all expressions with the same value have. */ | |
66 | unsigned int value_id; | |
67 | hashval_t hashcode; | |
f1f41a6c | 68 | vec<tree> phiargs; |
f6c33c78 | 69 | basic_block block; |
15edd328 | 70 | /* Controlling condition lhs/rhs. */ |
71 | tree cclhs; | |
72 | tree ccrhs; | |
82a7a70c | 73 | tree type; |
f6c33c78 | 74 | tree result; |
75 | } *vn_phi_t; | |
76 | typedef const struct vn_phi_s *const_vn_phi_t; | |
77 | ||
78 | /* Reference operands only exist in reference operations structures. | |
79 | They consist of an opcode, type, and some number of operands. For | |
80 | a given opcode, some, all, or none of the operands may be used. | |
81 | The operands are there to store the information that makes up the | |
82 | portion of the addressing calculation that opcode performs. */ | |
83 | ||
84 | typedef struct vn_reference_op_struct | |
85 | { | |
058a1b7a | 86 | ENUM_BITFIELD(tree_code) opcode : 16; |
842c7753 | 87 | /* Dependence info, used for [TARGET_]MEM_REF only. */ |
88 | unsigned short clique; | |
89 | unsigned short base; | |
8894566e | 90 | /* 1 for instrumented calls. */ |
91 | unsigned with_bounds : 1; | |
92 | unsigned reverse : 1; | |
93 | /* For storing TYPE_ALIGN for array ref element size computation. */ | |
94 | unsigned align : 6; | |
182cf5a9 | 95 | /* Constant offset this op adds or -1 if it is variable. */ |
96 | HOST_WIDE_INT off; | |
f6c33c78 | 97 | tree type; |
98 | tree op0; | |
99 | tree op1; | |
100 | tree op2; | |
101 | } vn_reference_op_s; | |
102 | typedef vn_reference_op_s *vn_reference_op_t; | |
103 | typedef const vn_reference_op_s *const_vn_reference_op_t; | |
104 | ||
8894566e | 105 | inline unsigned |
106 | vn_ref_op_align_unit (vn_reference_op_t op) | |
107 | { | |
108 | return op->align ? ((unsigned)1 << (op->align - 1)) / BITS_PER_UNIT : 0; | |
109 | } | |
f6c33c78 | 110 | |
dd277d48 | 111 | /* A reference operation in the hashtable is representation as |
112 | the vuse, representing the memory state at the time of | |
f6c33c78 | 113 | the operation, and a collection of operands that make up the |
114 | addressing calculation. If two vn_reference_t's have the same set | |
115 | of operands, they access the same memory location. We also store | |
dd277d48 | 116 | the resulting value number, and the hashcode. */ |
f6c33c78 | 117 | |
118 | typedef struct vn_reference_s | |
119 | { | |
120 | /* Unique identifier that all expressions with the same value have. */ | |
121 | unsigned int value_id; | |
122 | hashval_t hashcode; | |
dd277d48 | 123 | tree vuse; |
3918bd18 | 124 | alias_set_type set; |
125 | tree type; | |
f1f41a6c | 126 | vec<vn_reference_op_s> operands; |
f6c33c78 | 127 | tree result; |
b736e424 | 128 | tree result_vdef; |
f6c33c78 | 129 | } *vn_reference_t; |
130 | typedef const struct vn_reference_s *const_vn_reference_t; | |
131 | ||
132 | typedef struct vn_constant_s | |
133 | { | |
134 | unsigned int value_id; | |
135 | hashval_t hashcode; | |
136 | tree constant; | |
137 | } *vn_constant_t; | |
75a70cf9 | 138 | |
024fee2c | 139 | enum vn_kind { VN_NONE, VN_CONSTANT, VN_NARY, VN_REFERENCE, VN_PHI }; |
42acab1c | 140 | enum vn_kind vn_get_stmt_kind (gimple *); |
024fee2c | 141 | |
82a7a70c | 142 | /* Hash the type TYPE using bits that distinguishes it in the |
143 | types_compatible_p sense. */ | |
144 | ||
145 | static inline hashval_t | |
146 | vn_hash_type (tree type) | |
147 | { | |
148 | return (INTEGRAL_TYPE_P (type) | |
149 | + (INTEGRAL_TYPE_P (type) | |
150 | ? TYPE_PRECISION (type) + TYPE_UNSIGNED (type) : 0)); | |
151 | } | |
152 | ||
75a70cf9 | 153 | /* Hash the constant CONSTANT with distinguishing type incompatible |
154 | constants in the types_compatible_p sense. */ | |
155 | ||
156 | static inline hashval_t | |
157 | vn_hash_constant_with_type (tree constant) | |
158 | { | |
f32e91d5 | 159 | inchash::hash hstate; |
160 | inchash::add_expr (constant, hstate); | |
161 | hstate.merge_hash (vn_hash_type (TREE_TYPE (constant))); | |
162 | return hstate.end (); | |
75a70cf9 | 163 | } |
164 | ||
165 | /* Compare the constants C1 and C2 with distinguishing type incompatible | |
166 | constants in the types_compatible_p sense. */ | |
167 | ||
168 | static inline bool | |
169 | vn_constant_eq_with_type (tree c1, tree c2) | |
170 | { | |
171 | return (expressions_equal_p (c1, c2) | |
172 | && types_compatible_p (TREE_TYPE (c1), TREE_TYPE (c2))); | |
173 | } | |
174 | ||
9e9e6e3e | 175 | typedef struct vn_ssa_aux |
176 | { | |
9e9e6e3e | 177 | /* Value number. This may be an SSA name or a constant. */ |
178 | tree valnum; | |
eb074ef3 | 179 | /* Statements to insert if needs_insertion is true. */ |
180 | gimple_seq expr; | |
6d6adc82 | 181 | |
4345b868 | 182 | /* Saved SSA name info. */ |
183 | tree_ssa_name::ssa_name_info_type info; | |
184 | ||
f6c33c78 | 185 | /* Unique identifier that all expressions with the same value have. */ |
186 | unsigned int value_id; | |
187 | ||
6d6adc82 | 188 | /* SCC information. */ |
189 | unsigned int dfsnum; | |
190 | unsigned int low; | |
191 | unsigned visited : 1; | |
192 | unsigned on_sccstack : 1; | |
193 | ||
9e9e6e3e | 194 | /* Whether the SSA_NAME has been value numbered already. This is |
195 | only saying whether visit_use has been called on it at least | |
196 | once. It cannot be used to avoid visitation for SSA_NAME's | |
197 | involved in non-singleton SCC's. */ | |
6d6adc82 | 198 | unsigned use_processed : 1; |
1d9353f3 | 199 | |
200 | /* Whether the SSA_NAME has no defining statement and thus an | |
201 | insertion of such with EXPR as definition is required before | |
202 | a use can be created of it. */ | |
203 | unsigned needs_insertion : 1; | |
af09d40d | 204 | |
205 | /* Whether range-info is anti-range. */ | |
206 | unsigned range_info_anti_range_p : 1; | |
9e9e6e3e | 207 | } *vn_ssa_aux_t; |
208 | ||
6dc50383 | 209 | enum vn_lookup_kind { VN_NOWALK, VN_WALK, VN_WALKREWRITE }; |
8f190c8a | 210 | |
9e9e6e3e | 211 | /* Return the value numbering info for an SSA_NAME. */ |
adc83a75 | 212 | bool has_VN_INFO (tree); |
9e9e6e3e | 213 | extern vn_ssa_aux_t VN_INFO (tree); |
214 | extern vn_ssa_aux_t VN_INFO_GET (tree); | |
75a70cf9 | 215 | tree vn_get_expr_for (tree); |
c1f41db7 | 216 | void run_scc_vn (vn_lookup_kind); |
2201c330 | 217 | unsigned int vn_eliminate (bitmap); |
9e9e6e3e | 218 | void free_scc_vn (void); |
222ac318 | 219 | void scc_vn_restore_ssa_info (void); |
f6c33c78 | 220 | tree vn_nary_op_lookup (tree, vn_nary_op_t *); |
42acab1c | 221 | tree vn_nary_op_lookup_stmt (gimple *, vn_nary_op_t *); |
f6c33c78 | 222 | tree vn_nary_op_lookup_pieces (unsigned int, enum tree_code, |
7384c678 | 223 | tree, tree *, vn_nary_op_t *); |
f6c33c78 | 224 | vn_nary_op_t vn_nary_op_insert (tree, tree); |
225 | vn_nary_op_t vn_nary_op_insert_pieces (unsigned int, enum tree_code, | |
7384c678 | 226 | tree, tree *, tree, unsigned int); |
3918bd18 | 227 | bool ao_ref_init_from_vn_reference (ao_ref *, alias_set_type, tree, |
f1f41a6c | 228 | vec<vn_reference_op_s> ); |
e1bba980 | 229 | vec<vn_reference_op_s> vn_reference_operands_for_lookup (tree); |
3918bd18 | 230 | tree vn_reference_lookup_pieces (tree, alias_set_type, tree, |
f1f41a6c | 231 | vec<vn_reference_op_s> , |
8ecc6b38 | 232 | vn_reference_t *, vn_lookup_kind); |
0b3619e6 | 233 | tree vn_reference_lookup (tree, tree, vn_lookup_kind, vn_reference_t *, bool); |
1a91d914 | 234 | void vn_reference_lookup_call (gcall *, vn_reference_t *, vn_reference_t); |
3918bd18 | 235 | vn_reference_t vn_reference_insert_pieces (tree, alias_set_type, tree, |
f1f41a6c | 236 | vec<vn_reference_op_s> , |
f6c33c78 | 237 | tree, unsigned int); |
238 | ||
3e871d4d | 239 | bool vn_nary_op_eq (const_vn_nary_op_t const vno1, |
240 | const_vn_nary_op_t const vno2); | |
2ac47fdf | 241 | bool vn_nary_may_trap (vn_nary_op_t); |
3e871d4d | 242 | bool vn_reference_eq (const_vn_reference_t const, const_vn_reference_t const); |
f6c33c78 | 243 | unsigned int get_max_value_id (void); |
244 | unsigned int get_next_value_id (void); | |
8c8a7011 | 245 | unsigned int get_constant_value_id (tree); |
f6c33c78 | 246 | unsigned int get_or_alloc_constant_value_id (tree); |
247 | bool value_id_constant_p (unsigned int); | |
c26ce8a9 | 248 | tree fully_constant_vn_reference_p (vn_reference_t); |
97f2a90b | 249 | tree vn_nary_simplify (vn_nary_op_t); |
51385f30 | 250 | |
251 | /* Valueize NAME if it is an SSA name, otherwise just return it. */ | |
252 | ||
253 | static inline tree | |
254 | vn_valueize (tree name) | |
255 | { | |
256 | if (TREE_CODE (name) == SSA_NAME) | |
257 | { | |
258 | tree tem = VN_INFO (name)->valnum; | |
259 | return tem == VN_TOP ? name : tem; | |
260 | } | |
261 | return name; | |
262 | } | |
263 | ||
c716ac28 | 264 | /* Get at the original range info for NAME. */ |
265 | ||
266 | inline range_info_def * | |
267 | VN_INFO_RANGE_INFO (tree name) | |
268 | { | |
269 | return (VN_INFO (name)->info.range_info | |
270 | ? VN_INFO (name)->info.range_info | |
271 | : SSA_NAME_RANGE_INFO (name)); | |
272 | } | |
273 | ||
af09d40d | 274 | /* Whether the original range info of NAME is an anti-range. */ |
275 | ||
276 | inline bool | |
277 | VN_INFO_ANTI_RANGE_P (tree name) | |
278 | { | |
279 | return (VN_INFO (name)->info.range_info | |
280 | ? VN_INFO (name)->range_info_anti_range_p | |
281 | : SSA_NAME_ANTI_RANGE_P (name)); | |
282 | } | |
283 | ||
284 | /* Get at the original range info kind for NAME. */ | |
285 | ||
286 | inline value_range_type | |
287 | VN_INFO_RANGE_TYPE (tree name) | |
288 | { | |
289 | return VN_INFO_ANTI_RANGE_P (name) ? VR_ANTI_RANGE : VR_RANGE; | |
290 | } | |
291 | ||
c716ac28 | 292 | /* Get at the original pointer info for NAME. */ |
293 | ||
294 | inline ptr_info_def * | |
295 | VN_INFO_PTR_INFO (tree name) | |
296 | { | |
297 | return (VN_INFO (name)->info.ptr_info | |
298 | ? VN_INFO (name)->info.ptr_info | |
299 | : SSA_NAME_PTR_INFO (name)); | |
300 | } | |
301 | ||
9e9e6e3e | 302 | #endif /* TREE_SSA_SCCVN_H */ |