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
|
/* Lower and optimize address expressions.
Copyright (C) 2015-2016 Free Software Foundation, Inc.
Contributed by Marek Polacek <polacek@redhat.com>
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 "alias.h"
#include "predict.h"
#include "tm.h"
#include "function.h"
#include "dominance.h"
#include "cfg.h"
#include "basic-block.h"
#include "tree-ssa-alias.h"
#include "symtab.h"
#include "tree.h"
#include "stringpool.h"
#include "tree-ssanames.h"
#include "fold-const.h"
#include "gimple-expr.h"
#include "gimple.h"
#include "gimplify.h"
#include "gimple-iterator.h"
#include "gimplify-me.h"
#include "tree-pass.h"
namespace {
const pass_data pass_data_laddress =
{
GIMPLE_PASS, /* type */
"laddress", /* name */
OPTGROUP_NONE, /* optinfo_flags */
TV_GIMPLE_LADDRESS, /* tv_id */
( PROP_cfg | PROP_ssa ), /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
0, /* todo_flags_finish */
};
class pass_laddress : public gimple_opt_pass
{
public:
pass_laddress (gcc::context *ctxt)
: gimple_opt_pass (pass_data_laddress, ctxt)
{}
/* opt_pass methods: */
opt_pass * clone () { return new pass_laddress (m_ctxt); }
virtual bool gate (function *) { return optimize != 0; }
virtual unsigned int execute (function *);
}; // class pass_laddress
unsigned int
pass_laddress::execute (function *fun)
{
basic_block bb;
FOR_EACH_BB_FN (bb, fun)
{
for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi);)
{
gimple *stmt = gsi_stmt (gsi);
if (!is_gimple_assign (stmt)
|| gimple_assign_rhs_code (stmt) != ADDR_EXPR
|| is_gimple_invariant_address (gimple_assign_rhs1 (stmt)))
{
gsi_next (&gsi);
continue;
}
/* Lower ADDR_EXPR assignments:
_4 = &b[i_9];
into
_1 = (sizetype) i_9;
_7 = _1 * 4;
_4 = &b + _7;
This ought to aid the vectorizer and expose CSE opportunities.
*/
tree expr = gimple_assign_rhs1 (stmt);
HOST_WIDE_INT bitsize, bitpos;
tree base, offset;
machine_mode mode;
int volatilep = 0, reversep, unsignedp = 0;
base = get_inner_reference (TREE_OPERAND (expr, 0), &bitsize,
&bitpos, &offset, &mode, &unsignedp,
&reversep, &volatilep);
gcc_assert (base != NULL_TREE && (bitpos % BITS_PER_UNIT) == 0);
if (offset != NULL_TREE)
{
if (bitpos != 0)
offset = size_binop (PLUS_EXPR, offset,
size_int (bitpos / BITS_PER_UNIT));
offset = force_gimple_operand_gsi (&gsi, offset, true, NULL,
true, GSI_SAME_STMT);
base = build_fold_addr_expr (base);
base = force_gimple_operand_gsi (&gsi, base, true, NULL,
true, GSI_SAME_STMT);
gimple *g = gimple_build_assign (gimple_assign_lhs (stmt),
POINTER_PLUS_EXPR, base, offset);
gsi_replace (&gsi, g, false);
}
gsi_next (&gsi);
}
}
return 0;
}
} // anon namespace
gimple_opt_pass *
make_pass_laddress (gcc::context *ctxt)
{
return new pass_laddress (ctxt);
}
|
