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
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
|
/* Private floating point rounding and exceptions handling. AArch64 version.
Copyright (C) 2014-2017 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 AARCH64_MATH_PRIVATE_H
#define AARCH64_MATH_PRIVATE_H 1
#include <fenv.h>
#include <fpu_control.h>
#define math_opt_barrier(x) \
({ __typeof (x) __x = (x); __asm ("" : "+w" (__x)); __x; })
#define math_force_eval(x) \
({ __typeof (x) __x = (x); __asm __volatile__ ("" : : "w" (__x)); })
extern __always_inline double
__ieee754_sqrt (double d)
{
double res;
asm __volatile__ ("fsqrt %d0, %d1" : "=w" (res) : "w" (d));
return res;
}
extern __always_inline float
__ieee754_sqrtf (float s)
{
float res;
asm __volatile__ ("fsqrt %s0, %s1" : "=w" (res) : "w" (s));
return res;
}
static __always_inline void
libc_feholdexcept_aarch64 (fenv_t *envp)
{
fpu_control_t fpcr;
fpu_control_t new_fpcr;
fpu_fpsr_t fpsr;
fpu_fpsr_t new_fpsr;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
envp->__fpcr = fpcr;
envp->__fpsr = fpsr;
/* Clear exception flags and set all exceptions to non-stop. */
new_fpcr = fpcr & ~(FE_ALL_EXCEPT << FE_EXCEPT_SHIFT);
new_fpsr = fpsr & ~FE_ALL_EXCEPT;
if (__glibc_unlikely (new_fpcr != fpcr))
_FPU_SETCW (new_fpcr);
if (new_fpsr != fpsr)
_FPU_SETFPSR (new_fpsr);
}
#define libc_feholdexcept libc_feholdexcept_aarch64
#define libc_feholdexceptf libc_feholdexcept_aarch64
#define libc_feholdexceptl libc_feholdexcept_aarch64
static __always_inline void
libc_fesetround_aarch64 (int round)
{
fpu_control_t fpcr;
_FPU_GETCW (fpcr);
/* Check whether rounding modes are different. */
round = (fpcr ^ round) & _FPU_FPCR_RM_MASK;
/* Set new rounding mode if different. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpcr ^ round);
}
#define libc_fesetround libc_fesetround_aarch64
#define libc_fesetroundf libc_fesetround_aarch64
#define libc_fesetroundl libc_fesetround_aarch64
static __always_inline void
libc_feholdexcept_setround_aarch64 (fenv_t *envp, int round)
{
fpu_control_t fpcr;
fpu_control_t new_fpcr;
fpu_fpsr_t fpsr;
fpu_fpsr_t new_fpsr;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
envp->__fpcr = fpcr;
envp->__fpsr = fpsr;
/* Clear exception flags, set all exceptions to non-stop,
and set new rounding mode. */
new_fpcr = fpcr & ~((FE_ALL_EXCEPT << FE_EXCEPT_SHIFT) | _FPU_FPCR_RM_MASK);
new_fpcr |= round;
new_fpsr = fpsr & ~FE_ALL_EXCEPT;
if (__glibc_unlikely (new_fpcr != fpcr))
_FPU_SETCW (new_fpcr);
if (new_fpsr != fpsr)
_FPU_SETFPSR (new_fpsr);
}
#define libc_feholdexcept_setround libc_feholdexcept_setround_aarch64
#define libc_feholdexcept_setroundf libc_feholdexcept_setround_aarch64
#define libc_feholdexcept_setroundl libc_feholdexcept_setround_aarch64
static __always_inline int
libc_fetestexcept_aarch64 (int ex)
{
fpu_fpsr_t fpsr;
_FPU_GETFPSR (fpsr);
return fpsr & ex & FE_ALL_EXCEPT;
}
#define libc_fetestexcept libc_fetestexcept_aarch64
#define libc_fetestexceptf libc_fetestexcept_aarch64
#define libc_fetestexceptl libc_fetestexcept_aarch64
static __always_inline void
libc_fesetenv_aarch64 (const fenv_t *envp)
{
fpu_control_t fpcr;
fpu_control_t new_fpcr;
_FPU_GETCW (fpcr);
new_fpcr = envp->__fpcr;
if (__glibc_unlikely (fpcr != new_fpcr))
_FPU_SETCW (new_fpcr);
_FPU_SETFPSR (envp->__fpsr);
}
#define libc_fesetenv libc_fesetenv_aarch64
#define libc_fesetenvf libc_fesetenv_aarch64
#define libc_fesetenvl libc_fesetenv_aarch64
#define libc_feresetround_noex libc_fesetenv_aarch64
#define libc_feresetround_noexf libc_fesetenv_aarch64
#define libc_feresetround_noexl libc_fesetenv_aarch64
static __always_inline int
libc_feupdateenv_test_aarch64 (const fenv_t *envp, int ex)
{
fpu_control_t fpcr;
fpu_control_t new_fpcr;
fpu_fpsr_t fpsr;
fpu_fpsr_t new_fpsr;
int excepts;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
/* Merge current exception flags with the saved fenv. */
excepts = fpsr & FE_ALL_EXCEPT;
new_fpcr = envp->__fpcr;
new_fpsr = envp->__fpsr | excepts;
if (__glibc_unlikely (fpcr != new_fpcr))
_FPU_SETCW (new_fpcr);
if (fpsr != new_fpsr)
_FPU_SETFPSR (new_fpsr);
/* Raise the exceptions if enabled in the new FP state. */
if (__glibc_unlikely (excepts & (new_fpcr >> FE_EXCEPT_SHIFT)))
__feraiseexcept (excepts);
return excepts & ex;
}
#define libc_feupdateenv_test libc_feupdateenv_test_aarch64
#define libc_feupdateenv_testf libc_feupdateenv_test_aarch64
#define libc_feupdateenv_testl libc_feupdateenv_test_aarch64
static __always_inline void
libc_feupdateenv_aarch64 (const fenv_t *envp)
{
libc_feupdateenv_test_aarch64 (envp, 0);
}
#define libc_feupdateenv libc_feupdateenv_aarch64
#define libc_feupdateenvf libc_feupdateenv_aarch64
#define libc_feupdateenvl libc_feupdateenv_aarch64
static __always_inline void
libc_feholdsetround_aarch64 (fenv_t *envp, int round)
{
fpu_control_t fpcr;
fpu_fpsr_t fpsr;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
envp->__fpcr = fpcr;
envp->__fpsr = fpsr;
/* Check whether rounding modes are different. */
round = (fpcr ^ round) & _FPU_FPCR_RM_MASK;
/* Set new rounding mode if different. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpcr ^ round);
}
#define libc_feholdsetround libc_feholdsetround_aarch64
#define libc_feholdsetroundf libc_feholdsetround_aarch64
#define libc_feholdsetroundl libc_feholdsetround_aarch64
static __always_inline void
libc_feresetround_aarch64 (fenv_t *envp)
{
fpu_control_t fpcr;
int round;
_FPU_GETCW (fpcr);
/* Check whether rounding modes are different. */
round = (envp->__fpcr ^ fpcr) & _FPU_FPCR_RM_MASK;
/* Restore the rounding mode if it was changed. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpcr ^ round);
}
#define libc_feresetround libc_feresetround_aarch64
#define libc_feresetroundf libc_feresetround_aarch64
#define libc_feresetroundl libc_feresetround_aarch64
/* We have support for rounding mode context. */
#define HAVE_RM_CTX 1
static __always_inline void
libc_feholdsetround_aarch64_ctx (struct rm_ctx *ctx, int r)
{
fpu_control_t fpcr;
int round;
_FPU_GETCW (fpcr);
ctx->env.__fpcr = fpcr;
/* Check whether rounding modes are different. */
round = (fpcr ^ r) & _FPU_FPCR_RM_MASK;
ctx->updated_status = round != 0;
/* Set the rounding mode if changed. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpcr ^ round);
}
#define libc_feholdsetround_ctx libc_feholdsetround_aarch64_ctx
#define libc_feholdsetroundf_ctx libc_feholdsetround_aarch64_ctx
#define libc_feholdsetroundl_ctx libc_feholdsetround_aarch64_ctx
static __always_inline void
libc_feresetround_aarch64_ctx (struct rm_ctx *ctx)
{
/* Restore the rounding mode if updated. */
if (__glibc_unlikely (ctx->updated_status))
_FPU_SETCW (ctx->env.__fpcr);
}
#define libc_feresetround_ctx libc_feresetround_aarch64_ctx
#define libc_feresetroundf_ctx libc_feresetround_aarch64_ctx
#define libc_feresetroundl_ctx libc_feresetround_aarch64_ctx
static __always_inline void
libc_feholdsetround_noex_aarch64_ctx (struct rm_ctx *ctx, int r)
{
fpu_control_t fpcr;
fpu_fpsr_t fpsr;
int round;
_FPU_GETCW (fpcr);
_FPU_GETFPSR (fpsr);
ctx->env.__fpcr = fpcr;
ctx->env.__fpsr = fpsr;
/* Check whether rounding modes are different. */
round = (fpcr ^ r) & _FPU_FPCR_RM_MASK;
ctx->updated_status = round != 0;
/* Set the rounding mode if changed. */
if (__glibc_unlikely (round != 0))
_FPU_SETCW (fpcr ^ round);
}
#define libc_feholdsetround_noex_ctx libc_feholdsetround_noex_aarch64_ctx
#define libc_feholdsetround_noexf_ctx libc_feholdsetround_noex_aarch64_ctx
#define libc_feholdsetround_noexl_ctx libc_feholdsetround_noex_aarch64_ctx
static __always_inline void
libc_feresetround_noex_aarch64_ctx (struct rm_ctx *ctx)
{
/* Restore the rounding mode if updated. */
if (__glibc_unlikely (ctx->updated_status))
_FPU_SETCW (ctx->env.__fpcr);
/* Write new FPSR to restore exception flags. */
_FPU_SETFPSR (ctx->env.__fpsr);
}
#define libc_feresetround_noex_ctx libc_feresetround_noex_aarch64_ctx
#define libc_feresetround_noexf_ctx libc_feresetround_noex_aarch64_ctx
#define libc_feresetround_noexl_ctx libc_feresetround_noex_aarch64_ctx
/* Hack: only include the large arm_neon.h when needed. */
#ifdef _MATH_CONFIG_H
# include <arm_neon.h>
/* ACLE intrinsics for frintn and fcvtns instructions. */
# define TOINT_INTRINSICS 1
static inline double_t
roundtoint (double_t x)
{
return vget_lane_f64 (vrndn_f64 (vld1_f64 (&x)), 0);
}
static inline uint64_t
converttoint (double_t x)
{
return vcvtnd_s64_f64 (x);
}
#endif
#include_next <math_private.h>
#endif
|
