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
245
246
247
248
249
|
/* Private floating point rounding and exceptions handling. ARM VFP version.
Copyright (C) 2014-2018 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
<http://www.gnu.org/licenses/>. */
#ifndef FENV_PRIVATE_H
#define FENV_PRIVATE_H 1
#include <fenv.h>
#include <fpu_control.h>
static __always_inline void
libc_feholdexcept_vfp (fenv_t *envp)
{
fpu_control_t fpscr;
_FPU_GETCW (fpscr);
envp->__cw = fpscr;
/* Clear exception flags and set all exceptions to non-stop. */
fpscr &= ~_FPU_MASK_EXCEPT;
_FPU_SETCW (fpscr);
}
static __always_inline void
libc_fesetround_vfp (int round)
{
fpu_control_t fpscr;
_FPU_GETCW (fpscr);
/* Set new rounding mode if different. */
if (__glibc_unlikely ((fpscr & _FPU_MASK_RM) != round))
_FPU_SETCW ((fpscr & ~_FPU_MASK_RM) | round);
}
static __always_inline void
libc_feholdexcept_setround_vfp (fenv_t *envp, int round)
{
fpu_control_t fpscr;
_FPU_GETCW (fpscr);
envp->__cw = fpscr;
/* Clear exception flags, set all exceptions to non-stop,
and set new rounding mode. */
fpscr &= ~(_FPU_MASK_EXCEPT | _FPU_MASK_RM);
_FPU_SETCW (fpscr | round);
}
static __always_inline void
libc_feholdsetround_vfp (fenv_t *envp, int round)
{
fpu_control_t fpscr;
_FPU_GETCW (fpscr);
envp->__cw = fpscr;
/* Set new rounding mode if different. */
if (__glibc_unlikely ((fpscr & _FPU_MASK_RM) != round))
_FPU_SETCW ((fpscr & ~_FPU_MASK_RM) | round);
}
static __always_inline void
libc_feresetround_vfp (fenv_t *envp)
{
fpu_control_t fpscr, round;
_FPU_GETCW (fpscr);
/* Check whether rounding modes are different. */
round = (envp->__cw ^ fpscr) & _FPU_MASK_RM;
/* Restore the rounding mode if it was changed. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpscr ^ round);
}
static __always_inline int
libc_fetestexcept_vfp (int ex)
{
fpu_control_t fpscr;
_FPU_GETCW (fpscr);
return fpscr & ex & FE_ALL_EXCEPT;
}
static __always_inline void
libc_fesetenv_vfp (const fenv_t *envp)
{
fpu_control_t fpscr, new_fpscr;
_FPU_GETCW (fpscr);
new_fpscr = envp->__cw;
/* Write new FPSCR if different (ignoring NZCV flags). */
if (__glibc_unlikely (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0))
_FPU_SETCW (new_fpscr);
}
static __always_inline int
libc_feupdateenv_test_vfp (const fenv_t *envp, int ex)
{
fpu_control_t fpscr, new_fpscr;
int excepts;
_FPU_GETCW (fpscr);
/* Merge current exception flags with the saved fenv. */
excepts = fpscr & FE_ALL_EXCEPT;
new_fpscr = envp->__cw | excepts;
/* Write new FPSCR if different (ignoring NZCV flags). */
if (__glibc_unlikely (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0))
_FPU_SETCW (new_fpscr);
/* Raise the exceptions if enabled in the new FP state. */
if (__glibc_unlikely (excepts & (new_fpscr >> FE_EXCEPT_SHIFT)))
__feraiseexcept (excepts);
return excepts & ex;
}
static __always_inline void
libc_feupdateenv_vfp (const fenv_t *envp)
{
libc_feupdateenv_test_vfp (envp, 0);
}
static __always_inline void
libc_feholdsetround_vfp_ctx (struct rm_ctx *ctx, int r)
{
fpu_control_t fpscr, round;
_FPU_GETCW (fpscr);
ctx->updated_status = false;
ctx->env.__cw = fpscr;
/* Check whether rounding modes are different. */
round = (fpscr ^ r) & _FPU_MASK_RM;
/* Set the rounding mode if changed. */
if (__glibc_unlikely (round != 0))
{
ctx->updated_status = true;
_FPU_SETCW (fpscr ^ round);
}
}
static __always_inline void
libc_feresetround_vfp_ctx (struct rm_ctx *ctx)
{
/* Restore the rounding mode if updated. */
if (__glibc_unlikely (ctx->updated_status))
{
fpu_control_t fpscr;
_FPU_GETCW (fpscr);
fpscr = (fpscr & ~_FPU_MASK_RM) | (ctx->env.__cw & _FPU_MASK_RM);
_FPU_SETCW (fpscr);
}
}
static __always_inline void
libc_fesetenv_vfp_ctx (struct rm_ctx *ctx)
{
fpu_control_t fpscr, new_fpscr;
_FPU_GETCW (fpscr);
new_fpscr = ctx->env.__cw;
/* Write new FPSCR if different (ignoring NZCV flags). */
if (__glibc_unlikely (((fpscr ^ new_fpscr) & ~_FPU_MASK_NZCV) != 0))
_FPU_SETCW (new_fpscr);
}
#ifndef __SOFTFP__
# define libc_feholdexcept libc_feholdexcept_vfp
# define libc_feholdexceptf libc_feholdexcept_vfp
# define libc_feholdexceptl libc_feholdexcept_vfp
# define libc_fesetround libc_fesetround_vfp
# define libc_fesetroundf libc_fesetround_vfp
# define libc_fesetroundl libc_fesetround_vfp
# define libc_feresetround libc_feresetround_vfp
# define libc_feresetroundf libc_feresetround_vfp
# define libc_feresetroundl libc_feresetround_vfp
# define libc_feresetround_noex libc_fesetenv_vfp
# define libc_feresetround_noexf libc_fesetenv_vfp
# define libc_feresetround_noexl libc_fesetenv_vfp
# define libc_feholdexcept_setround libc_feholdexcept_setround_vfp
# define libc_feholdexcept_setroundf libc_feholdexcept_setround_vfp
# define libc_feholdexcept_setroundl libc_feholdexcept_setround_vfp
# define libc_feholdsetround libc_feholdsetround_vfp
# define libc_feholdsetroundf libc_feholdsetround_vfp
# define libc_feholdsetroundl libc_feholdsetround_vfp
# define libc_fetestexcept libc_fetestexcept_vfp
# define libc_fetestexceptf libc_fetestexcept_vfp
# define libc_fetestexceptl libc_fetestexcept_vfp
# define libc_fesetenv libc_fesetenv_vfp
# define libc_fesetenvf libc_fesetenv_vfp
# define libc_fesetenvl libc_fesetenv_vfp
# define libc_feupdateenv libc_feupdateenv_vfp
# define libc_feupdateenvf libc_feupdateenv_vfp
# define libc_feupdateenvl libc_feupdateenv_vfp
# define libc_feupdateenv_test libc_feupdateenv_test_vfp
# define libc_feupdateenv_testf libc_feupdateenv_test_vfp
# define libc_feupdateenv_testl libc_feupdateenv_test_vfp
/* We have support for rounding mode context. */
#define HAVE_RM_CTX 1
# define libc_feholdsetround_ctx libc_feholdsetround_vfp_ctx
# define libc_feresetround_ctx libc_feresetround_vfp_ctx
# define libc_feresetround_noex_ctx libc_fesetenv_vfp_ctx
# define libc_feholdsetroundf_ctx libc_feholdsetround_vfp_ctx
# define libc_feresetroundf_ctx libc_feresetround_vfp_ctx
# define libc_feresetround_noexf_ctx libc_fesetenv_vfp_ctx
# define libc_feholdsetroundl_ctx libc_feholdsetround_vfp_ctx
# define libc_feresetroundl_ctx libc_feresetround_vfp_ctx
# define libc_feresetround_noexl_ctx libc_fesetenv_vfp_ctx
#endif
#endif /* FENV_PRIVATE_H */
|
