1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
/* Tree SCC value numbering
Copyright (C) 2007-2014 Free Software Foundation, Inc.
Contributed by Daniel Berlin <dberlin@dberlin.org>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef TREE_SSA_SCCVN_H
#define TREE_SSA_SCCVN_H
/* In tree-ssa-sccvn.c */
bool expressions_equal_p (tree, tree);
/* TOP of the VN lattice. */
extern tree VN_TOP;
/* N-ary operations in the hashtable consist of length operands, an
opcode, and a type. Result is the value number of the operation,
and hashcode is stored to avoid having to calculate it
repeatedly. */
typedef struct vn_nary_op_s
{
/* Unique identify that all expressions with the same value have. */
unsigned int value_id;
ENUM_BITFIELD(tree_code) opcode : 16;
unsigned length : 16;
hashval_t hashcode;
tree result;
tree type;
tree op[1];
} *vn_nary_op_t;
typedef const struct vn_nary_op_s *const_vn_nary_op_t;
/* Return the size of a vn_nary_op_t with LENGTH operands. */
static inline size_t
sizeof_vn_nary_op (unsigned int length)
{
return sizeof (struct vn_nary_op_s) + sizeof (tree) * length - sizeof (tree);
}
/* Phi nodes in the hashtable consist of their non-VN_TOP phi
arguments, and the basic block the phi is in. Result is the value
number of the operation, and hashcode is stored to avoid having to
calculate it repeatedly. Phi nodes not in the same block are never
considered equivalent. */
typedef struct vn_phi_s
{
/* Unique identifier that all expressions with the same value have. */
unsigned int value_id;
hashval_t hashcode;
vec<tree> phiargs;
basic_block block;
tree type;
tree result;
} *vn_phi_t;
typedef const struct vn_phi_s *const_vn_phi_t;
/* Reference operands only exist in reference operations structures.
They consist of an opcode, type, and some number of operands. For
a given opcode, some, all, or none of the operands may be used.
The operands are there to store the information that makes up the
portion of the addressing calculation that opcode performs. */
typedef struct vn_reference_op_struct
{
ENUM_BITFIELD(tree_code) opcode : 16;
/* 1 for instrumented calls. */
unsigned with_bounds : 1;
/* Constant offset this op adds or -1 if it is variable. */
HOST_WIDE_INT off;
tree type;
tree op0;
tree op1;
tree op2;
} vn_reference_op_s;
typedef vn_reference_op_s *vn_reference_op_t;
typedef const vn_reference_op_s *const_vn_reference_op_t;
/* A reference operation in the hashtable is representation as
the vuse, representing the memory state at the time of
the operation, and a collection of operands that make up the
addressing calculation. If two vn_reference_t's have the same set
of operands, they access the same memory location. We also store
the resulting value number, and the hashcode. */
typedef struct vn_reference_s
{
/* Unique identifier that all expressions with the same value have. */
unsigned int value_id;
hashval_t hashcode;
tree vuse;
alias_set_type set;
tree type;
vec<vn_reference_op_s> operands;
tree result;
tree result_vdef;
} *vn_reference_t;
typedef const struct vn_reference_s *const_vn_reference_t;
typedef struct vn_constant_s
{
unsigned int value_id;
hashval_t hashcode;
tree constant;
} *vn_constant_t;
enum vn_kind { VN_NONE, VN_CONSTANT, VN_NARY, VN_REFERENCE, VN_PHI };
enum vn_kind vn_get_stmt_kind (gimple);
/* Hash the type TYPE using bits that distinguishes it in the
types_compatible_p sense. */
static inline hashval_t
vn_hash_type (tree type)
{
return (INTEGRAL_TYPE_P (type)
+ (INTEGRAL_TYPE_P (type)
? TYPE_PRECISION (type) + TYPE_UNSIGNED (type) : 0));
}
/* Hash the constant CONSTANT with distinguishing type incompatible
constants in the types_compatible_p sense. */
static inline hashval_t
vn_hash_constant_with_type (tree constant)
{
inchash::hash hstate;
inchash::add_expr (constant, hstate);
hstate.merge_hash (vn_hash_type (TREE_TYPE (constant)));
return hstate.end ();
}
/* Compare the constants C1 and C2 with distinguishing type incompatible
constants in the types_compatible_p sense. */
static inline bool
vn_constant_eq_with_type (tree c1, tree c2)
{
return (expressions_equal_p (c1, c2)
&& types_compatible_p (TREE_TYPE (c1), TREE_TYPE (c2)));
}
typedef struct vn_ssa_aux
{
/* Value number. This may be an SSA name or a constant. */
tree valnum;
/* Representative expression, if not a direct constant. */
tree expr;
/* Unique identifier that all expressions with the same value have. */
unsigned int value_id;
/* SCC information. */
unsigned int dfsnum;
unsigned int low;
unsigned visited : 1;
unsigned on_sccstack : 1;
/* Whether the representative expression contains constants. */
unsigned has_constants : 1;
/* Whether the SSA_NAME has been value numbered already. This is
only saying whether visit_use has been called on it at least
once. It cannot be used to avoid visitation for SSA_NAME's
involved in non-singleton SCC's. */
unsigned use_processed : 1;
/* Whether the SSA_NAME has no defining statement and thus an
insertion of such with EXPR as definition is required before
a use can be created of it. */
unsigned needs_insertion : 1;
} *vn_ssa_aux_t;
typedef enum { VN_NOWALK, VN_WALK, VN_WALKREWRITE } vn_lookup_kind;
/* Return the value numbering info for an SSA_NAME. */
extern vn_ssa_aux_t VN_INFO (tree);
extern vn_ssa_aux_t VN_INFO_GET (tree);
tree vn_get_expr_for (tree);
bool run_scc_vn (vn_lookup_kind);
void free_scc_vn (void);
tree vn_nary_op_lookup (tree, vn_nary_op_t *);
tree vn_nary_op_lookup_stmt (gimple, vn_nary_op_t *);
tree vn_nary_op_lookup_pieces (unsigned int, enum tree_code,
tree, tree *, vn_nary_op_t *);
vn_nary_op_t vn_nary_op_insert (tree, tree);
vn_nary_op_t vn_nary_op_insert_stmt (gimple, tree);
vn_nary_op_t vn_nary_op_insert_pieces (unsigned int, enum tree_code,
tree, tree *, tree, unsigned int);
void vn_reference_fold_indirect (vec<vn_reference_op_s> *,
unsigned int *);
bool ao_ref_init_from_vn_reference (ao_ref *, alias_set_type, tree,
vec<vn_reference_op_s> );
tree vn_reference_lookup_pieces (tree, alias_set_type, tree,
vec<vn_reference_op_s> ,
vn_reference_t *, vn_lookup_kind);
tree vn_reference_lookup (tree, tree, vn_lookup_kind, vn_reference_t *);
void vn_reference_lookup_call (gcall *, vn_reference_t *, vn_reference_t);
vn_reference_t vn_reference_insert_pieces (tree, alias_set_type, tree,
vec<vn_reference_op_s> ,
tree, unsigned int);
bool vn_nary_op_eq (const_vn_nary_op_t const vno1,
const_vn_nary_op_t const vno2);
bool vn_nary_may_trap (vn_nary_op_t);
bool vn_reference_eq (const_vn_reference_t const, const_vn_reference_t const);
unsigned int get_max_value_id (void);
unsigned int get_next_value_id (void);
unsigned int get_constant_value_id (tree);
unsigned int get_or_alloc_constant_value_id (tree);
bool value_id_constant_p (unsigned int);
tree fully_constant_vn_reference_p (vn_reference_t);
/* Valueize NAME if it is an SSA name, otherwise just return it. */
static inline tree
vn_valueize (tree name)
{
if (TREE_CODE (name) == SSA_NAME)
{
tree tem = VN_INFO (name)->valnum;
return tem == VN_TOP ? name : tem;
}
return name;
}
#endif /* TREE_SSA_SCCVN_H */
|
