fenv.h revision 1.3 1 /* $NetBSD: fenv.h,v 1.3 2017/03/22 23:11:10 chs Exp $ */
2
3 /*-
4 * Copyright (c) 2016 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #ifndef _SH3_FENV_H_
33 #define _SH3_FENV_H_
34
35 #include <sys/stdint.h>
36 #include <sh3/float.h>
37 #include <sh3/fpreg.h>
38
39 #ifndef __fenv_static
40 #define __fenv_static static
41 #endif
42
43 /* Exception bits, from FPSCR */
44 #define FE_INEXACT ((uint32_t)FPSCR_EXCEPTION_INEXACT >> 5)
45 #define FE_DIVBYZERO ((uint32_t)FPSCR_EXCEPTION_ZERODIV >> 5)
46 #define FE_UNDERFLOW ((uint32_t)FPSCR_EXCEPTION_UNDERFLOW >> 5)
47 #define FE_OVERFLOW ((uint32_t)FPSCR_EXCEPTION_OVERFLOW >> 5)
48 #define FE_INVALID ((uint32_t)FPSCR_EXCEPTION_INVALID >> 5)
49
50 #define FE_ALL_EXCEPT \
51 (FE_INEXACT | FE_DIVBYZERO | FE_UNDERFLOW | FE_OVERFLOW | FE_INVALID)
52
53 /* Rounding modes, from FPSCR */
54 #define FE_TONEAREST FPSCR_ROUND_NEAREST
55 #define FE_TOWARDZERO FPSCR_ROUND_ZERO
56 /* These two don't exist and are only defined for the benefit of softfloat */
57 #define FE_DOWNWARD (FPSCR_ROUND_ZERO + 1)
58 #define FE_UPWARD (FPSCR_ROUND_ZERO + 2)
59
60 #define _ROUND_MASK \
61 (FE_TONEAREST | FE_TOWARDZERO)
62
63 #ifdef __SH_FPU_ANY__
64
65 typedef uint32_t fexcept_t;
66
67 typedef struct {
68 uint32_t __fpscr;
69 } fenv_t;
70
71 #define FE_DFL_ENV ((fenv_t *) -1)
72
73 #define __get_fpscr(__fpscr) \
74 __asm__ __volatile__ ("sts fpscr,%0" : "=r" (__fpscr))
75 #define __set_fpscr(__fpscr) \
76 __asm__ __volatile__ ("lds %0,fpscr" : : "r" (__fpscr))
77
78 __BEGIN_DECLS
79
80 __fenv_static inline int
81 feclearexcept(int __excepts)
82 {
83 fexcept_t __fpscr;
84
85 __excepts &= FE_ALL_EXCEPT;
86
87 __get_fpscr(__fpscr);
88 __fpscr &= ~__excepts;
89 __set_fpscr(__fpscr);
90
91 return 0;
92 }
93
94 __fenv_static inline int
95 fegetexceptflag(fexcept_t *__flagp, int __excepts)
96 {
97 fexcept_t __fpscr;
98
99 __get_fpscr(__fpscr);
100
101 *__flagp = __fpscr & __excepts & FE_ALL_EXCEPT;
102
103 return 0;
104 }
105
106 __fenv_static inline int
107 fesetexceptflag(const fexcept_t *__flagp, int __excepts)
108 {
109 fexcept_t __fpscr;
110
111 __get_fpscr(__fpscr);
112
113 __fpscr &= ~(__excepts & FE_ALL_EXCEPT);
114 __fpscr |= *__flagp & __excepts & FE_ALL_EXCEPT;
115
116 __set_fpscr(__fpscr);
117
118 return 0;
119 }
120
121 static inline void
122 __fmul(double a, double b)
123 {
124 #ifdef __sh4__
125 __asm__ __volatile__ ("fmul %1, %0" : "+d" (a) : "d" (b));
126 #endif
127 }
128
129 static inline void
130 __fdiv(double a, double b) {
131 #ifdef __sh4__
132 __asm__ __volatile__ ("fdiv %1, %0" : "+d" (a) : "d" (b));
133 #endif
134 }
135
136 __fenv_static inline int
137 feraiseexcept(int __excepts)
138 {
139 fexcept_t __fpscr;
140
141 if (__excepts & FE_INVALID) /* Inf * 0 */
142 __fmul(__builtin_huge_val(), 0.0);
143
144 if (__excepts & FE_DIVBYZERO) /* 1.0 / 0 */
145 __fdiv(1.0, 0.0);
146
147 if (__excepts & FE_OVERFLOW) /* MAX * MAX */
148 __fmul(LDBL_MAX, LDBL_MAX);
149
150 if (__excepts & FE_UNDERFLOW) /* MIN / 10.0 */
151 __fdiv(LDBL_MIN, 10.0);
152
153 if (__excepts & FE_INEXACT) /* 1 / 3 */
154 __fdiv(1.0, 3.0);
155
156 __get_fpscr(__fpscr);
157
158 __fpscr |= __excepts & FE_ALL_EXCEPT;
159
160 __set_fpscr(__fpscr);
161
162 return 0;
163 }
164
165 __fenv_static inline int
166 fetestexcept(int __excepts)
167 {
168 fexcept_t __fpscr;
169
170 __get_fpscr(__fpscr);
171
172 return __fpscr & __excepts & FE_ALL_EXCEPT;
173 }
174
175 __fenv_static inline int
176 fegetround(void)
177 {
178 fexcept_t __fpscr;
179
180 __get_fpscr(__fpscr);
181 return __fpscr & _ROUND_MASK;
182 }
183
184 __fenv_static inline int
185 fesetround(int __round)
186 {
187 fexcept_t __fpscr;
188
189 if (__round & ~_ROUND_MASK)
190 return -1;
191
192 __get_fpscr(__fpscr);
193
194 __fpscr &= ~_ROUND_MASK;
195 __fpscr |= __round;
196
197 __set_fpscr(__fpscr);
198
199 return 0;
200 }
201
202 __fenv_static inline int
203 fegetenv(fenv_t *__envp)
204 {
205 fexcept_t __fpscr;
206
207 __get_fpscr(__fpscr);
208 __envp->__fpscr = __fpscr;
209
210 return 0;
211 }
212
213 __fenv_static inline int
214 feholdexcept(fenv_t *__envp)
215 {
216 fexcept_t __fpscr;
217
218 __get_fpscr(__fpscr);
219 __envp->__fpscr = __fpscr;
220
221 __fpscr &= ~FE_ALL_EXCEPT;
222 __fpscr &= ~(FE_ALL_EXCEPT << 5);
223 __set_fpscr(__fpscr); /* clear all */
224
225 return 0;
226 }
227
228 __fenv_static inline int
229 fesetenv(const fenv_t *__envp)
230 {
231 if (__envp == FE_DFL_ENV)
232 __set_fpscr(FPSCR_DEFAULT);
233 else
234 __set_fpscr(__envp->__fpscr);
235
236 return 0;
237 }
238
239 __fenv_static inline int
240 feupdateenv(const fenv_t *__envp)
241 {
242 fexcept_t __fpscr;
243
244 __get_fpscr(__fpscr);
245 __fpscr &= FE_ALL_EXCEPT;
246 fesetenv(__envp);
247 feraiseexcept((int)__fpscr);
248 return 0;
249 }
250
251 #if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE)
252
253 /* We currently provide no external definitions of the functions below. */
254
255 static inline int
256 feenableexcept(int __mask)
257 {
258 fexcept_t __fpscr, __oldmask;
259
260 __get_fpscr(__fpscr);
261 __oldmask = (__fpscr >> 5) & FE_ALL_EXCEPT;
262 __fpscr |= (__mask & FE_ALL_EXCEPT) << 5;
263 __set_fpscr(__fpscr);
264
265 return __oldmask;
266 }
267
268 static inline int
269 fedisableexcept(int __mask)
270 {
271 fexcept_t __fpscr, __oldmask;
272
273 __get_fpscr(__fpscr);
274 __oldmask = (__fpscr >> 5) & FE_ALL_EXCEPT;
275 __fpscr &= ~(__mask & FE_ALL_EXCEPT) << 5;
276 __set_fpscr(__fpscr);
277
278 return __oldmask;
279 }
280
281 static inline int
282 fegetexcept(void)
283 {
284 fexcept_t __fpscr;
285
286 __get_fpscr(__fpscr);
287
288 return (__fpscr >> 5) & FE_ALL_EXCEPT;
289 }
290
291 #endif /* _NETBSD_SOURCE || _GNU_SOURCE */
292
293 __END_DECLS
294
295 #endif /* __SH_FPU_ANY__ */
296
297 #endif /* _SH3_FENV_H_ */
298