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
|
/* Support routines for Value Range Propagation (VRP).
Copyright (C) 2005-2020 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, 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/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "tree.h"
#include "gimple.h"
#include "tree-pass.h"
#include "ssa.h"
#include "gimple-pretty-print.h"
#include "cfganal.h"
#include "gimple-fold.h"
#include "tree-eh.h"
#include "gimple-iterator.h"
#include "tree-cfg.h"
#include "tree-ssa-loop-manip.h"
#include "tree-ssa-loop.h"
#include "cfgloop.h"
#include "tree-scalar-evolution.h"
#include "tree-ssa-propagate.h"
#include "alloc-pool.h"
#include "domwalk.h"
#include "tree-cfgcleanup.h"
#include "vr-values.h"
#include "gimple-ssa-evrp-analyze.h"
class evrp_folder : public substitute_and_fold_engine
{
public:
evrp_folder () : m_range_analyzer (/*update_global_ranges=*/true),
m_vr_values (m_range_analyzer.get_vr_values ()),
simplifier (m_vr_values)
{
}
~evrp_folder ()
{
if (dump_file)
{
fprintf (dump_file, "\nValue ranges after Early VRP:\n\n");
m_range_analyzer.dump_all_value_ranges (dump_file);
fprintf (dump_file, "\n");
}
}
tree get_value (tree op, gimple *stmt ATTRIBUTE_UNUSED) OVERRIDE
{
return m_vr_values->op_with_constant_singleton_value_range (op);
}
void pre_fold_bb (basic_block bb) OVERRIDE
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "evrp visiting BB%d\n", bb->index);
m_range_analyzer.enter (bb);
}
void pre_fold_stmt (gimple *stmt) OVERRIDE
{
if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file, "evrp visiting stmt ");
print_gimple_stmt (dump_file, stmt, 0);
}
m_range_analyzer.record_ranges_from_stmt (stmt, false);
}
bool fold_stmt (gimple_stmt_iterator *gsi) OVERRIDE
{
return simplifier.simplify (gsi);
}
void post_fold_bb (basic_block bb) OVERRIDE
{
m_range_analyzer.leave (bb);
}
void post_new_stmt (gimple *stmt) OVERRIDE
{
m_range_analyzer.get_vr_values ()->set_defs_to_varying (stmt);
}
private:
DISABLE_COPY_AND_ASSIGN (evrp_folder);
class evrp_range_analyzer m_range_analyzer;
class vr_values *m_vr_values;
simplify_using_ranges simplifier;
};
/* Main entry point for the early vrp pass which is a simplified non-iterative
version of vrp where basic blocks are visited in dominance order. Value
ranges discovered in early vrp will also be used by ipa-vrp. */
static unsigned int
execute_early_vrp ()
{
/* Ideally this setup code would move into the ctor for the folder
However, this setup can change the number of blocks which
invalidates the internal arrays that are set up by the dominator
walker in substitute_and_fold_engine. */
loop_optimizer_init (LOOPS_NORMAL | LOOPS_HAVE_RECORDED_EXITS);
rewrite_into_loop_closed_ssa (NULL, TODO_update_ssa);
scev_initialize ();
calculate_dominance_info (CDI_DOMINATORS);
evrp_folder folder;
folder.substitute_and_fold ();
scev_finalize ();
loop_optimizer_finalize ();
return 0;
}
namespace {
const pass_data pass_data_early_vrp =
{
GIMPLE_PASS, /* type */
"evrp", /* name */
OPTGROUP_NONE, /* optinfo_flags */
TV_TREE_EARLY_VRP, /* tv_id */
PROP_ssa, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
( TODO_cleanup_cfg | TODO_update_ssa | TODO_verify_all ),
};
class pass_early_vrp : public gimple_opt_pass
{
public:
pass_early_vrp (gcc::context *ctxt)
: gimple_opt_pass (pass_data_early_vrp, ctxt)
{}
/* opt_pass methods: */
opt_pass * clone () { return new pass_early_vrp (m_ctxt); }
virtual bool gate (function *)
{
return flag_tree_vrp != 0;
}
virtual unsigned int execute (function *)
{ return execute_early_vrp (); }
}; // class pass_vrp
} // anon namespace
gimple_opt_pass *
make_pass_early_vrp (gcc::context *ctxt)
{
return new pass_early_vrp (ctxt);
}
|
