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
|
/* Generic hooks for the RTL middle-end.
Copyright (C) 2004-2022 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 "tm.h"
#include "function.h"
#include "rtl.h"
#include "tree.h"
#include "insn-config.h"
#include "memmodel.h"
#include "emit-rtl.h"
#include "recog.h"
#include "rtlhooks-def.h"
#include "explow.h"
#include "target.h"
/* For speed, we will copy the RTX hooks struct member-by-member
instead of doing indirect calls. For these reason, we initialize
*two* struct rtl_hooks globals: rtl_hooks is the one that is used
to actually call the hooks, while general_rtl_hooks is used
to restore the hooks by passes that modify them. */
const struct rtl_hooks general_rtl_hooks = RTL_HOOKS_INITIALIZER;
struct rtl_hooks rtl_hooks = RTL_HOOKS_INITIALIZER;
rtx
gen_lowpart_general (machine_mode mode, rtx x)
{
rtx result = gen_lowpart_common (mode, x);
if (result)
return result;
/* Handle SUBREGs and hard REGs that were rejected by
simplify_gen_subreg. */
else if (REG_P (x) || GET_CODE (x) == SUBREG)
{
result = gen_lowpart_common (mode, copy_to_reg (x));
gcc_assert (result != 0);
return result;
}
else
{
/* The only additional case we can do is MEM. */
gcc_assert (MEM_P (x));
/* The following exposes the use of "x" to CSE. */
scalar_int_mode xmode;
if (is_a <scalar_int_mode> (GET_MODE (x), &xmode)
&& GET_MODE_SIZE (xmode) <= UNITS_PER_WORD
&& TRULY_NOOP_TRUNCATION_MODES_P (mode, xmode)
&& !reload_completed)
return gen_lowpart_general (mode, force_reg (xmode, x));
poly_int64 offset = byte_lowpart_offset (mode, GET_MODE (x));
return adjust_address (x, mode, offset);
}
}
rtx
reg_num_sign_bit_copies_general (const_rtx, scalar_int_mode, scalar_int_mode,
unsigned int *)
{
return NULL;
}
rtx
reg_nonzero_bits_general (const_rtx, scalar_int_mode, scalar_int_mode,
unsigned HOST_WIDE_INT *)
{
return NULL;
}
bool
reg_truncated_to_mode_general (machine_mode mode ATTRIBUTE_UNUSED,
const_rtx x ATTRIBUTE_UNUSED)
{
return false;
}
/* Assuming that X is an rtx (e.g., MEM, REG or SUBREG) for a fixed-point
number, return an rtx (MEM, SUBREG, or CONST_INT) that refers to the
least-significant part of X.
MODE specifies how big a part of X to return.
If the requested operation cannot be done, 0 is returned.
This is similar to gen_lowpart_general. */
rtx
gen_lowpart_if_possible (machine_mode mode, rtx x)
{
rtx result = gen_lowpart_common (mode, x);
if (result)
return result;
else if (MEM_P (x))
{
/* This is the only other case we handle. */
poly_int64 offset = byte_lowpart_offset (mode, GET_MODE (x));
rtx new_rtx = adjust_address_nv (x, mode, offset);
if (! memory_address_addr_space_p (mode, XEXP (new_rtx, 0),
MEM_ADDR_SPACE (x)))
return 0;
return new_rtx;
}
else if (mode != GET_MODE (x) && GET_MODE (x) != VOIDmode && !SUBREG_P (x)
&& validate_subreg (mode, GET_MODE (x), x,
subreg_lowpart_offset (mode, GET_MODE (x))))
return gen_lowpart_SUBREG (mode, x);
else
return 0;
}
|
