Mercurial > hg > CbC > CbC_gcc
comparison gcc/tree-ssa-sccvn.h @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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children | 77e2b8dfacca |
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1 /* Tree SCC value numbering | |
2 Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc. | |
3 Contributed by Daniel Berlin <dberlin@dberlin.org> | |
4 | |
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/>. */ | |
20 | |
21 #ifndef TREE_SSA_SCCVN_H | |
22 #define TREE_SSA_SCCVN_H | |
23 | |
24 /* TOP of the VN lattice. */ | |
25 extern tree VN_TOP; | |
26 | |
27 /* N-ary operations in the hashtable consist of length operands, an | |
28 opcode, and a type. Result is the value number of the operation, | |
29 and hashcode is stored to avoid having to calculate it | |
30 repeatedly. */ | |
31 | |
32 typedef struct vn_nary_op_s | |
33 { | |
34 /* Unique identify that all expressions with the same value have. */ | |
35 unsigned int value_id; | |
36 ENUM_BITFIELD(tree_code) opcode : 16; | |
37 unsigned length : 16; | |
38 hashval_t hashcode; | |
39 tree result; | |
40 tree type; | |
41 tree op[4]; | |
42 } *vn_nary_op_t; | |
43 typedef const struct vn_nary_op_s *const_vn_nary_op_t; | |
44 | |
45 /* Phi nodes in the hashtable consist of their non-VN_TOP phi | |
46 arguments, and the basic block the phi is in. Result is the value | |
47 number of the operation, and hashcode is stored to avoid having to | |
48 calculate it repeatedly. Phi nodes not in the same block are never | |
49 considered equivalent. */ | |
50 | |
51 typedef struct vn_phi_s | |
52 { | |
53 /* Unique identifier that all expressions with the same value have. */ | |
54 unsigned int value_id; | |
55 hashval_t hashcode; | |
56 VEC (tree, heap) *phiargs; | |
57 basic_block block; | |
58 tree result; | |
59 } *vn_phi_t; | |
60 typedef const struct vn_phi_s *const_vn_phi_t; | |
61 | |
62 /* Reference operands only exist in reference operations structures. | |
63 They consist of an opcode, type, and some number of operands. For | |
64 a given opcode, some, all, or none of the operands may be used. | |
65 The operands are there to store the information that makes up the | |
66 portion of the addressing calculation that opcode performs. */ | |
67 | |
68 typedef struct vn_reference_op_struct | |
69 { | |
70 enum tree_code opcode; | |
71 tree type; | |
72 tree op0; | |
73 tree op1; | |
74 tree op2; | |
75 } vn_reference_op_s; | |
76 typedef vn_reference_op_s *vn_reference_op_t; | |
77 typedef const vn_reference_op_s *const_vn_reference_op_t; | |
78 | |
79 DEF_VEC_O(vn_reference_op_s); | |
80 DEF_VEC_ALLOC_O(vn_reference_op_s, heap); | |
81 | |
82 /* A reference operation in the hashtable is representation as a | |
83 collection of vuses, representing the memory state at the time of | |
84 the operation, and a collection of operands that make up the | |
85 addressing calculation. If two vn_reference_t's have the same set | |
86 of operands, they access the same memory location. We also store | |
87 the resulting value number, and the hashcode. The vuses are | |
88 always stored in order sorted by ssa name version. */ | |
89 | |
90 typedef struct vn_reference_s | |
91 { | |
92 /* Unique identifier that all expressions with the same value have. */ | |
93 unsigned int value_id; | |
94 hashval_t hashcode; | |
95 VEC (tree, gc) *vuses; | |
96 VEC (vn_reference_op_s, heap) *operands; | |
97 tree result; | |
98 } *vn_reference_t; | |
99 typedef const struct vn_reference_s *const_vn_reference_t; | |
100 | |
101 typedef struct vn_constant_s | |
102 { | |
103 unsigned int value_id; | |
104 hashval_t hashcode; | |
105 tree constant; | |
106 } *vn_constant_t; | |
107 | |
108 /* Hash the constant CONSTANT with distinguishing type incompatible | |
109 constants in the types_compatible_p sense. */ | |
110 | |
111 static inline hashval_t | |
112 vn_hash_constant_with_type (tree constant) | |
113 { | |
114 tree type = TREE_TYPE (constant); | |
115 return (iterative_hash_expr (constant, 0) | |
116 + INTEGRAL_TYPE_P (type) | |
117 + (INTEGRAL_TYPE_P (type) | |
118 ? TYPE_PRECISION (type) + TYPE_UNSIGNED (type) : 0)); | |
119 } | |
120 | |
121 /* Compare the constants C1 and C2 with distinguishing type incompatible | |
122 constants in the types_compatible_p sense. */ | |
123 | |
124 static inline bool | |
125 vn_constant_eq_with_type (tree c1, tree c2) | |
126 { | |
127 return (expressions_equal_p (c1, c2) | |
128 && types_compatible_p (TREE_TYPE (c1), TREE_TYPE (c2))); | |
129 } | |
130 | |
131 typedef struct vn_ssa_aux | |
132 { | |
133 /* Value number. This may be an SSA name or a constant. */ | |
134 tree valnum; | |
135 /* Representative expression, if not a direct constant. */ | |
136 tree expr; | |
137 | |
138 /* Unique identifier that all expressions with the same value have. */ | |
139 unsigned int value_id; | |
140 | |
141 /* SCC information. */ | |
142 unsigned int dfsnum; | |
143 unsigned int low; | |
144 unsigned visited : 1; | |
145 unsigned on_sccstack : 1; | |
146 | |
147 /* Whether the representative expression contains constants. */ | |
148 unsigned has_constants : 1; | |
149 /* Whether the SSA_NAME has been value numbered already. This is | |
150 only saying whether visit_use has been called on it at least | |
151 once. It cannot be used to avoid visitation for SSA_NAME's | |
152 involved in non-singleton SCC's. */ | |
153 unsigned use_processed : 1; | |
154 | |
155 /* Whether the SSA_NAME has no defining statement and thus an | |
156 insertion of such with EXPR as definition is required before | |
157 a use can be created of it. */ | |
158 unsigned needs_insertion : 1; | |
159 } *vn_ssa_aux_t; | |
160 | |
161 /* Return the value numbering info for an SSA_NAME. */ | |
162 extern vn_ssa_aux_t VN_INFO (tree); | |
163 extern vn_ssa_aux_t VN_INFO_GET (tree); | |
164 tree vn_get_expr_for (tree); | |
165 bool run_scc_vn (bool); | |
166 void free_scc_vn (void); | |
167 tree vn_nary_op_lookup (tree, vn_nary_op_t *); | |
168 tree vn_nary_op_lookup_stmt (gimple, vn_nary_op_t *); | |
169 tree vn_nary_op_lookup_pieces (unsigned int, enum tree_code, | |
170 tree, tree, tree, tree, tree, | |
171 vn_nary_op_t *); | |
172 vn_nary_op_t vn_nary_op_insert (tree, tree); | |
173 vn_nary_op_t vn_nary_op_insert_stmt (gimple, tree); | |
174 vn_nary_op_t vn_nary_op_insert_pieces (unsigned int, enum tree_code, | |
175 tree, tree, tree, tree, | |
176 tree, tree, unsigned int); | |
177 void copy_reference_ops_from_ref (tree, VEC(vn_reference_op_s, heap) **); | |
178 void copy_reference_ops_from_call (gimple, VEC(vn_reference_op_s, heap) **); | |
179 tree vn_reference_lookup_pieces (VEC (tree, gc) *, | |
180 VEC (vn_reference_op_s, heap) *, | |
181 vn_reference_t *, bool); | |
182 tree vn_reference_lookup (tree, VEC (tree, gc) *, bool, vn_reference_t *); | |
183 vn_reference_t vn_reference_insert (tree, tree, VEC (tree, gc) *); | |
184 vn_reference_t vn_reference_insert_pieces (VEC (tree, gc) *, | |
185 VEC (vn_reference_op_s, heap) *, | |
186 tree, unsigned int); | |
187 | |
188 hashval_t vn_nary_op_compute_hash (const vn_nary_op_t); | |
189 int vn_nary_op_eq (const void *, const void *); | |
190 bool vn_nary_may_trap (vn_nary_op_t); | |
191 hashval_t vn_reference_compute_hash (const vn_reference_t); | |
192 int vn_reference_eq (const void *, const void *); | |
193 unsigned int get_max_value_id (void); | |
194 unsigned int get_next_value_id (void); | |
195 unsigned int get_constant_value_id (tree); | |
196 unsigned int get_or_alloc_constant_value_id (tree); | |
197 bool value_id_constant_p (unsigned int); | |
198 VEC (tree, gc) *shared_vuses_from_stmt (gimple); | |
199 #endif /* TREE_SSA_SCCVN_H */ |