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89fb70a3 | 1 | /* Tree SCC value numbering |
d652f226 | 2 | Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
89fb70a3 DB |
3 | Contributed by Daniel Berlin <dberlin@dberlin.org> |
4 | ||
9dcd6f09 NC |
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/>. */ | |
89fb70a3 DB |
20 | |
21 | #ifndef TREE_SSA_SCCVN_H | |
22 | #define TREE_SSA_SCCVN_H | |
23 | ||
b2ad0284 BRF |
24 | /* In tree-ssa-sccvn.c */ |
25 | bool expressions_equal_p (tree, tree); | |
26 | ||
27 | ||
89fb70a3 DB |
28 | /* TOP of the VN lattice. */ |
29 | extern tree VN_TOP; | |
30 | ||
c9145754 DB |
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; | |
45 | tree op[4]; | |
46 | } *vn_nary_op_t; | |
47 | typedef const struct vn_nary_op_s *const_vn_nary_op_t; | |
48 | ||
49 | /* Phi nodes in the hashtable consist of their non-VN_TOP phi | |
50 | arguments, and the basic block the phi is in. Result is the value | |
51 | number of the operation, and hashcode is stored to avoid having to | |
52 | calculate it repeatedly. Phi nodes not in the same block are never | |
53 | considered equivalent. */ | |
54 | ||
55 | typedef struct vn_phi_s | |
56 | { | |
57 | /* Unique identifier that all expressions with the same value have. */ | |
58 | unsigned int value_id; | |
59 | hashval_t hashcode; | |
60 | VEC (tree, heap) *phiargs; | |
61 | basic_block block; | |
62 | tree result; | |
63 | } *vn_phi_t; | |
64 | typedef const struct vn_phi_s *const_vn_phi_t; | |
65 | ||
66 | /* Reference operands only exist in reference operations structures. | |
67 | They consist of an opcode, type, and some number of operands. For | |
68 | a given opcode, some, all, or none of the operands may be used. | |
69 | The operands are there to store the information that makes up the | |
70 | portion of the addressing calculation that opcode performs. */ | |
71 | ||
72 | typedef struct vn_reference_op_struct | |
73 | { | |
74 | enum tree_code opcode; | |
70f34814 RG |
75 | /* Constant offset this op adds or -1 if it is variable. */ |
76 | HOST_WIDE_INT off; | |
c9145754 DB |
77 | tree type; |
78 | tree op0; | |
79 | tree op1; | |
80 | tree op2; | |
81 | } vn_reference_op_s; | |
82 | typedef vn_reference_op_s *vn_reference_op_t; | |
83 | typedef const vn_reference_op_s *const_vn_reference_op_t; | |
84 | ||
85 | DEF_VEC_O(vn_reference_op_s); | |
86 | DEF_VEC_ALLOC_O(vn_reference_op_s, heap); | |
87 | ||
5006671f RG |
88 | /* A reference operation in the hashtable is representation as |
89 | the vuse, representing the memory state at the time of | |
c9145754 DB |
90 | the operation, and a collection of operands that make up the |
91 | addressing calculation. If two vn_reference_t's have the same set | |
92 | of operands, they access the same memory location. We also store | |
5006671f | 93 | the resulting value number, and the hashcode. */ |
c9145754 DB |
94 | |
95 | typedef struct vn_reference_s | |
96 | { | |
97 | /* Unique identifier that all expressions with the same value have. */ | |
98 | unsigned int value_id; | |
99 | hashval_t hashcode; | |
5006671f | 100 | tree vuse; |
b45d2719 RG |
101 | alias_set_type set; |
102 | tree type; | |
c9145754 DB |
103 | VEC (vn_reference_op_s, heap) *operands; |
104 | tree result; | |
105 | } *vn_reference_t; | |
106 | typedef const struct vn_reference_s *const_vn_reference_t; | |
107 | ||
108 | typedef struct vn_constant_s | |
109 | { | |
110 | unsigned int value_id; | |
111 | hashval_t hashcode; | |
112 | tree constant; | |
113 | } *vn_constant_t; | |
726a989a RB |
114 | |
115 | /* Hash the constant CONSTANT with distinguishing type incompatible | |
116 | constants in the types_compatible_p sense. */ | |
117 | ||
118 | static inline hashval_t | |
119 | vn_hash_constant_with_type (tree constant) | |
120 | { | |
121 | tree type = TREE_TYPE (constant); | |
122 | return (iterative_hash_expr (constant, 0) | |
123 | + INTEGRAL_TYPE_P (type) | |
124 | + (INTEGRAL_TYPE_P (type) | |
125 | ? TYPE_PRECISION (type) + TYPE_UNSIGNED (type) : 0)); | |
126 | } | |
127 | ||
128 | /* Compare the constants C1 and C2 with distinguishing type incompatible | |
129 | constants in the types_compatible_p sense. */ | |
130 | ||
131 | static inline bool | |
132 | vn_constant_eq_with_type (tree c1, tree c2) | |
133 | { | |
134 | return (expressions_equal_p (c1, c2) | |
135 | && types_compatible_p (TREE_TYPE (c1), TREE_TYPE (c2))); | |
136 | } | |
137 | ||
89fb70a3 DB |
138 | typedef struct vn_ssa_aux |
139 | { | |
89fb70a3 DB |
140 | /* Value number. This may be an SSA name or a constant. */ |
141 | tree valnum; | |
142 | /* Representative expression, if not a direct constant. */ | |
143 | tree expr; | |
71ae8557 | 144 | |
c9145754 DB |
145 | /* Unique identifier that all expressions with the same value have. */ |
146 | unsigned int value_id; | |
147 | ||
71ae8557 SB |
148 | /* SCC information. */ |
149 | unsigned int dfsnum; | |
150 | unsigned int low; | |
151 | unsigned visited : 1; | |
152 | unsigned on_sccstack : 1; | |
153 | ||
89fb70a3 | 154 | /* Whether the representative expression contains constants. */ |
71ae8557 | 155 | unsigned has_constants : 1; |
89fb70a3 DB |
156 | /* Whether the SSA_NAME has been value numbered already. This is |
157 | only saying whether visit_use has been called on it at least | |
158 | once. It cannot be used to avoid visitation for SSA_NAME's | |
159 | involved in non-singleton SCC's. */ | |
71ae8557 | 160 | unsigned use_processed : 1; |
3d45dd59 RG |
161 | |
162 | /* Whether the SSA_NAME has no defining statement and thus an | |
163 | insertion of such with EXPR as definition is required before | |
164 | a use can be created of it. */ | |
165 | unsigned needs_insertion : 1; | |
89fb70a3 DB |
166 | } *vn_ssa_aux_t; |
167 | ||
168 | /* Return the value numbering info for an SSA_NAME. */ | |
169 | extern vn_ssa_aux_t VN_INFO (tree); | |
170 | extern vn_ssa_aux_t VN_INFO_GET (tree); | |
726a989a | 171 | tree vn_get_expr_for (tree); |
70f34814 | 172 | bool run_scc_vn (void); |
89fb70a3 | 173 | void free_scc_vn (void); |
c9145754 | 174 | tree vn_nary_op_lookup (tree, vn_nary_op_t *); |
726a989a | 175 | tree vn_nary_op_lookup_stmt (gimple, vn_nary_op_t *); |
c9145754 DB |
176 | tree vn_nary_op_lookup_pieces (unsigned int, enum tree_code, |
177 | tree, tree, tree, tree, tree, | |
178 | vn_nary_op_t *); | |
179 | vn_nary_op_t vn_nary_op_insert (tree, tree); | |
726a989a | 180 | vn_nary_op_t vn_nary_op_insert_stmt (gimple, tree); |
c9145754 DB |
181 | vn_nary_op_t vn_nary_op_insert_pieces (unsigned int, enum tree_code, |
182 | tree, tree, tree, tree, | |
183 | tree, tree, unsigned int); | |
aa7069aa RG |
184 | void vn_reference_fold_indirect (VEC (vn_reference_op_s, heap) **, |
185 | unsigned int *); | |
ce94d354 | 186 | void copy_reference_ops_from_ref (tree, VEC(vn_reference_op_s, heap) **); |
726a989a | 187 | void copy_reference_ops_from_call (gimple, VEC(vn_reference_op_s, heap) **); |
b45d2719 RG |
188 | bool ao_ref_init_from_vn_reference (ao_ref *, alias_set_type, tree, |
189 | VEC (vn_reference_op_s, heap) *); | |
3bc27de7 | 190 | typedef enum { VN_NOWALK, VN_WALK, VN_WALKREWRITE } vn_lookup_kind; |
b45d2719 | 191 | tree vn_reference_lookup_pieces (tree, alias_set_type, tree, |
c9145754 | 192 | VEC (vn_reference_op_s, heap) *, |
3bc27de7 RG |
193 | vn_reference_t *, vn_lookup_kind); |
194 | tree vn_reference_lookup (tree, tree, vn_lookup_kind, vn_reference_t *); | |
5006671f | 195 | vn_reference_t vn_reference_insert (tree, tree, tree); |
b45d2719 | 196 | vn_reference_t vn_reference_insert_pieces (tree, alias_set_type, tree, |
c9145754 DB |
197 | VEC (vn_reference_op_s, heap) *, |
198 | tree, unsigned int); | |
199 | ||
200 | hashval_t vn_nary_op_compute_hash (const vn_nary_op_t); | |
201 | int vn_nary_op_eq (const void *, const void *); | |
890065bf | 202 | bool vn_nary_may_trap (vn_nary_op_t); |
c9145754 DB |
203 | hashval_t vn_reference_compute_hash (const vn_reference_t); |
204 | int vn_reference_eq (const void *, const void *); | |
205 | unsigned int get_max_value_id (void); | |
206 | unsigned int get_next_value_id (void); | |
bb9e4199 | 207 | unsigned int get_constant_value_id (tree); |
c9145754 DB |
208 | unsigned int get_or_alloc_constant_value_id (tree); |
209 | bool value_id_constant_p (unsigned int); | |
12bd5a1e | 210 | tree fully_constant_vn_reference_p (vn_reference_t); |
89fb70a3 | 211 | #endif /* TREE_SSA_SCCVN_H */ |