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
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
|
/* Private floating point rounding and exceptions handling. PowerPC version.
Copyright (C) 2013-2015 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 <fenv_libc.h>
#include <fpu_control.h>
#define _FPU_MASK_ALL (_FPU_MASK_ZM | _FPU_MASK_OM | _FPU_MASK_UM \
| _FPU_MASK_XM | _FPU_MASK_IM)
/* Mask everything but the rounding moded and non-IEEE arithmetic flags. */
#define _FPU_MASK_ROUNDING 0xffffffff00000007LL
/* Mask restore rounding mode and exception enabled. */
#define _FPU_MASK_EXCEPT_ROUND 0xffffffff1fffff00LL
/* Mask exception enable but fraction rounded/inexact and FP result/CC
bits. */
#define _FPU_MASK_FRAC_INEX_RET_CC 0x1ff80fff
static __always_inline void
libc_feholdexcept_ppc (fenv_t *envp)
{
fenv_union_t old, new;
old.fenv = *envp = fegetenv_register ();
new.l = old.l & _FPU_MASK_ROUNDING;
/* If the old env had any enabled exceptions, then mask SIGFPE in the
MSR FE0/FE1 bits. This may allow the FPU to run faster because it
always takes the default action and can not generate SIGFPE. */
if ((old.l & _FPU_MASK_ALL) != 0)
(void) __fe_mask_env ();
fesetenv_register (new.fenv);
}
static __always_inline void
libc_fesetround_ppc (int r)
{
__fesetround (r);
}
static __always_inline void
libc_feholdexcept_setround_ppc (fenv_t *envp, int r)
{
fenv_union_t old, new;
old.fenv = *envp = fegetenv_register ();
new.l = (old.l & _FPU_MASK_ROUNDING) | r;
if ((old.l & _FPU_MASK_ALL) != 0)
(void) __fe_mask_env ();
fesetenv_register (new.fenv);
}
static __always_inline int
libc_fetestexcept_ppc (int e)
{
fenv_union_t u;
u.fenv = fegetenv_register ();
return u.l & e;
}
static __always_inline void
libc_fesetenv_ppc (const fenv_t *envp)
{
fenv_union_t old, new;
new.fenv = *envp;
old.fenv = fegetenv_register ();
/* If the old env has no enabled exceptions and the new env has any enabled
exceptions, then unmask SIGFPE in the MSR FE0/FE1 bits. This will put the
hardware into "precise mode" and may cause the FPU to run slower on some
hardware. */
if ((old.l & _FPU_MASK_ALL) == 0 && (new.l & _FPU_MASK_ALL) != 0)
(void) __fe_nomask_env_priv ();
/* If the old env had any enabled exceptions and the new env has no enabled
exceptions, then mask SIGFPE in the MSR FE0/FE1 bits. This may allow the
FPU to run faster because it always takes the default action and can not
generate SIGFPE. */
if ((old.l & _FPU_MASK_ALL) != 0 && (new.l & _FPU_MASK_ALL) == 0)
(void) __fe_mask_env ();
fesetenv_register (*envp);
}
static __always_inline int
libc_feupdateenv_test_ppc (fenv_t *envp, int ex)
{
fenv_union_t old, new;
new.fenv = *envp;
old.fenv = fegetenv_register ();
/* Restore rounding mode and exception enable from *envp and merge
exceptions. Leave fraction rounded/inexact and FP result/CC bits
unchanged. */
new.l = (old.l & _FPU_MASK_EXCEPT_ROUND)
| (new.l & _FPU_MASK_FRAC_INEX_RET_CC);
if ((old.l & _FPU_MASK_ALL) == 0 && (new.l & _FPU_MASK_ALL) != 0)
(void) __fe_nomask_env_priv ();
if ((old.l & _FPU_MASK_ALL) != 0 && (new.l & _FPU_MASK_ALL) == 0)
(void) __fe_mask_env ();
fesetenv_register (new.fenv);
return old.l & ex;
}
static __always_inline void
libc_feupdateenv_ppc (fenv_t *e)
{
libc_feupdateenv_test_ppc (e, 0);
}
static __always_inline void
libc_feholdsetround_ppc (fenv_t *e, int r)
{
fenv_union_t old, new;
old.fenv = fegetenv_register ();
/* Clear current precision and set newer one. */
new.l = (old.l & ~0x3) | r;
*e = old.fenv;
if ((old.l & _FPU_MASK_ALL) != 0)
(void) __fe_mask_env ();
fesetenv_register (new.fenv);
}
static __always_inline void
libc_feresetround_ppc (fenv_t *envp)
{
fenv_union_t old, new;
new.fenv = *envp;
old.fenv = fegetenv_register ();
/* Restore rounding mode and exception enable from *envp and merge
exceptions. Leave fraction rounded/inexact and FP result/CC bits
unchanged. */
new.l = (old.l & _FPU_MASK_EXCEPT_ROUND)
| (new.l & _FPU_MASK_FRAC_INEX_RET_CC);
if ((old.l & _FPU_MASK_ALL) == 0 && (new.l & _FPU_MASK_ALL) != 0)
(void) __fe_nomask_env_priv ();
if ((old.l & _FPU_MASK_ALL) != 0 && (new.l & _FPU_MASK_ALL) == 0)
(void) __fe_mask_env ();
/* Atomically enable and raise (if appropriate) exceptions set in `new'. */
fesetenv_register (new.fenv);
}
#define libc_feholdexceptf libc_feholdexcept_ppc
#define libc_feholdexcept libc_feholdexcept_ppc
#define libc_feholdexcept_setroundf libc_feholdexcept_setround_ppc
#define libc_feholdexcept_setround libc_feholdexcept_setround_ppc
#define libc_fetestexceptf libc_fetestexcept_ppc
#define libc_fetestexcept libc_fetestexcept_ppc
#define libc_fesetroundf libc_fesetround_ppc
#define libc_fesetround libc_fesetround_ppc
#define libc_fesetenvf libc_fesetenv_ppc
#define libc_fesetenv libc_fesetenv_ppc
#define libc_feupdateenv_testf libc_feupdateenv_test_ppc
#define libc_feupdateenv_test libc_feupdateenv_test_ppc
#define libc_feupdateenvf libc_feupdateenv_ppc
#define libc_feupdateenv libc_feupdateenv_ppc
#define libc_feholdsetroundf libc_feholdsetround_ppc
#define libc_feholdsetround libc_feholdsetround_ppc
#define libc_feresetroundf libc_feresetround_ppc
#define libc_feresetround libc_feresetround_ppc
/* We have support for rounding mode context. */
#define HAVE_RM_CTX 1
static __always_inline void
libc_feholdexcept_setround_ppc_ctx (struct rm_ctx *ctx, int r)
{
fenv_union_t old, new;
old.fenv = fegetenv_register ();
new.l = (old.l & _FPU_MASK_ROUNDING) | r;
ctx->env = old.fenv;
if (__glibc_unlikely (new.l != old.l))
{
if ((old.l & _FPU_MASK_ALL) != 0)
(void) __fe_mask_env ();
fesetenv_register (new.fenv);
ctx->updated_status = true;
}
else
ctx->updated_status = false;
}
static __always_inline void
libc_fesetenv_ppc_ctx (struct rm_ctx *ctx)
{
libc_fesetenv_ppc (&ctx->env);
}
static __always_inline void
libc_feupdateenv_ppc_ctx (struct rm_ctx *ctx)
{
if (__glibc_unlikely (ctx->updated_status))
libc_feupdateenv_test_ppc (&ctx->env, 0);
}
static __always_inline void
libc_feholdsetround_ppc_ctx (struct rm_ctx *ctx, int r)
{
fenv_union_t old, new;
old.fenv = fegetenv_register ();
new.l = (old.l & ~0x3) | r;
ctx->env = old.fenv;
if (__glibc_unlikely (new.l != old.l))
{
if ((old.l & _FPU_MASK_ALL) != 0)
(void) __fe_mask_env ();
fesetenv_register (new.fenv);
ctx->updated_status = true;
}
else
ctx->updated_status = false;
}
static __always_inline void
libc_feresetround_ppc_ctx (struct rm_ctx *ctx)
{
if (__glibc_unlikely (ctx->updated_status))
libc_feresetround_ppc (&ctx->env);
}
#define libc_feholdexcept_setround_ctx libc_feholdexcept_setround_ppc_ctx
#define libc_feholdexcept_setroundf_ctx libc_feholdexcept_setround_ppc_ctx
#define libc_feholdexcept_setroundl_ctx libc_feholdexcept_setround_ppc_ctx
#define libc_fesetenv_ctx libc_fesetenv_ppc_ctx
#define libc_fesetenvf_ctx libc_fesetenv_ppc_ctx
#define libc_fesetenvl_ctx libc_fesetenv_ppc_ctx
#define libc_feholdsetround_ctx libc_feholdsetround_ppc_ctx
#define libc_feholdsetroundf_ctx libc_feholdsetround_ppc_ctx
#define libc_feholdsetroundl_ctx libc_feholdsetround_ppc_ctx
#define libc_feresetround_ctx libc_feresetround_ppc_ctx
#define libc_feresetroundf_ctx libc_feresetround_ppc_ctx
#define libc_feresetroundl_ctx libc_feresetround_ppc_ctx
#define libc_feupdateenv_ctx libc_feupdateenv_ppc_ctx
#define libc_feupdateenvf_ctx libc_feupdateenv_ppc_ctx
#define libc_feupdateenvl_ctx libc_feupdateenv_ppc_ctx
#endif
|
