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
|
/* Private floating point rounding and exceptions handling. RISC-V version.
Copyright (C) 2014-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef RISCV_FENV_PRIVATE_H
#define RISCV_FENV_PRIVATE_H 1
#include <fenv.h>
#include <fpu_control.h>
#include <get-rounding-mode.h>
static __always_inline int
riscv_getround (void)
{
return get_rounding_mode ();
}
static __always_inline void
riscv_setround (int rm)
{
asm volatile ("fsrm %z0" : : "rJ" (rm));
}
static __always_inline int
riscv_getflags (void)
{
int flags;
asm volatile ("frflags %0" : "=r" (flags));
return flags;
}
static __always_inline void
riscv_setflags (int flags)
{
asm volatile ("fsflags %z0" : : "rJ" (flags));
}
static __always_inline void
libc_feholdexcept_riscv (fenv_t *envp)
{
asm volatile ("csrrc %0, fcsr, %1" : "=r" (*envp) : "i" (FE_ALL_EXCEPT));
}
#define libc_feholdexcept libc_feholdexcept_riscv
#define libc_feholdexceptf libc_feholdexcept_riscv
#define libc_feholdexceptl libc_feholdexcept_riscv
static __always_inline void
libc_fesetround_riscv (int round)
{
riscv_setround (round);
}
#define libc_fesetround libc_fesetround_riscv
#define libc_fesetroundf libc_fesetround_riscv
#define libc_fesetroundl libc_fesetround_riscv
static __always_inline void
libc_feholdexcept_setround_riscv (fenv_t *envp, int round)
{
libc_feholdexcept_riscv (envp);
libc_fesetround_riscv (round);
}
#define libc_feholdexcept_setround libc_feholdexcept_setround_riscv
#define libc_feholdexcept_setroundf libc_feholdexcept_setround_riscv
#define libc_feholdexcept_setroundl libc_feholdexcept_setround_riscv
static __always_inline int
libc_fetestexcept_riscv (int ex)
{
return riscv_getflags () & ex;
}
#define libc_fetestexcept libc_fetestexcept_riscv
#define libc_fetestexceptf libc_fetestexcept_riscv
#define libc_fetestexceptl libc_fetestexcept_riscv
static __always_inline void
libc_fesetenv_riscv (const fenv_t *envp)
{
long int env = (long int) envp - (long int) FE_DFL_ENV;
if (env != 0)
env = *envp;
_FPU_SETCW (env);
}
#define libc_fesetenv libc_fesetenv_riscv
#define libc_fesetenvf libc_fesetenv_riscv
#define libc_fesetenvl libc_fesetenv_riscv
#define libc_feresetround_noex libc_fesetenv_riscv
#define libc_feresetround_noexf libc_fesetenv_riscv
#define libc_feresetround_noexl libc_fesetenv_riscv
static __always_inline int
libc_feupdateenv_test_riscv (const fenv_t *envp, int ex)
{
fenv_t env = *envp;
int flags = riscv_getflags ();
asm volatile ("csrw fcsr, %z0" : : "rJ" (env | flags));
return flags & ex;
}
#define libc_feupdateenv_test libc_feupdateenv_test_riscv
#define libc_feupdateenv_testf libc_feupdateenv_test_riscv
#define libc_feupdateenv_testl libc_feupdateenv_test_riscv
static __always_inline void
libc_feupdateenv_riscv (const fenv_t *envp)
{
_FPU_SETCW (*envp | riscv_getflags ());
}
#define libc_feupdateenv libc_feupdateenv_riscv
#define libc_feupdateenvf libc_feupdateenv_riscv
#define libc_feupdateenvl libc_feupdateenv_riscv
static __always_inline void
libc_feholdsetround_riscv (fenv_t *envp, int round)
{
/* Note this implementation makes an improperly-formatted fenv_t and
so should only be used in conjunction with libc_feresetround. */
int old_round;
asm volatile ("csrrw %0, frm, %z1" : "=r" (old_round) : "rJ" (round));
*envp = old_round;
}
#define libc_feholdsetround libc_feholdsetround_riscv
#define libc_feholdsetroundf libc_feholdsetround_riscv
#define libc_feholdsetroundl libc_feholdsetround_riscv
static __always_inline void
libc_feresetround_riscv (fenv_t *envp)
{
/* Note this implementation takes an improperly-formatted fenv_t and
so should only be used in conjunction with libc_feholdsetround. */
riscv_setround (*envp);
}
#define libc_feresetround libc_feresetround_riscv
#define libc_feresetroundf libc_feresetround_riscv
#define libc_feresetroundl libc_feresetround_riscv
#include_next <fenv_private.h>
#endif
|
