1/*-
2 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/10.1/lib/msun/ia64/fenv.h 226218 2011-10-10 15:43:09Z das $
27 */
28
29#ifndef	_IA64_FENV_H_
30#define	_IA64_FENV_H_
31
32#include <sys/stdint.h>
33
34#ifndef	__fenv_static
35#define	__fenv_static	static
36#endif
37
38typedef	__uint64_t	fenv_t;
39typedef	__uint16_t	fexcept_t;
40
41/* Exception flags */
42#define	FE_INVALID	0x01
43#define	FE_DENORMAL	0x02
44#define	FE_DIVBYZERO	0x04
45#define	FE_OVERFLOW	0x08
46#define	FE_UNDERFLOW	0x10
47#define	FE_INEXACT	0x20
48#define	FE_ALL_EXCEPT	(FE_DIVBYZERO | FE_DENORMAL | FE_INEXACT | \
49			 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
50
51/* Rounding modes */
52#define	FE_TONEAREST	0x0000
53#define	FE_DOWNWARD	0x0400
54#define	FE_UPWARD	0x0800
55#define	FE_TOWARDZERO	0x0c00
56#define	_ROUND_MASK	(FE_TONEAREST | FE_DOWNWARD | \
57			 FE_UPWARD | FE_TOWARDZERO)
58
59__BEGIN_DECLS
60
61/* Default floating-point environment */
62extern const fenv_t	__fe_dfl_env;
63#define	FE_DFL_ENV	(&__fe_dfl_env)
64
65#define	_FPUSW_SHIFT	13
66
67#define	__stfpsr(__r)	__asm __volatile("mov %0=ar.fpsr" : "=r" (*(__r)))
68#define	__ldfpsr(__r)	__asm __volatile("mov ar.fpsr=%0;;" : : "r" (__r))
69
70#if __GNUC_PREREQ__(8, 0)
71#pragma GCC diagnostic push
72#pragma GCC diagnostic ignored "-Wshadow"
73#endif
74
75__fenv_static inline int
76feclearexcept(int __excepts)
77{
78	fenv_t __fpsr;
79
80	__stfpsr(&__fpsr);
81	__fpsr &= ~((fenv_t)__excepts << _FPUSW_SHIFT);
82	__ldfpsr(__fpsr);
83	return (0);
84}
85
86__fenv_static inline int
87fegetexceptflag(fexcept_t *__flagp, int __excepts)
88{
89	fenv_t __fpsr;
90
91	__stfpsr(&__fpsr);
92	*__flagp = (fexcept_t)(__fpsr >> _FPUSW_SHIFT) & __excepts;
93	return (0);
94}
95
96__fenv_static inline int
97fesetexceptflag(const fexcept_t *__flagp, int __excepts)
98{
99	fenv_t __fpsr;
100
101	__stfpsr(&__fpsr);
102	__fpsr &= ~((fenv_t)__excepts << _FPUSW_SHIFT);
103	__fpsr |= (fenv_t)(__excepts & *__flagp) << _FPUSW_SHIFT;
104	__ldfpsr(__fpsr);
105	return (0);
106}
107
108/*
109 * It is worthwhile to use the inline version of this function iff it
110 * is called with arguments that are compile-time constants (due to
111 * dead code elimination).  Unfortunately, gcc isn't smart enough to
112 * figure this out automatically, and there's no way to tell it.
113 * We assume that constant arguments will be the common case.
114 */
115__fenv_static inline int
116feraiseexcept(int __excepts)
117{
118	volatile double d;
119
120	/*
121	 * With a compiler that supports the FENV_ACCESS pragma
122	 * properly, simple expressions like '0.0 / 0.0' should
123	 * be sufficient to generate traps.  Unfortunately, we
124	 * need to bring a volatile variable into the equation
125	 * to prevent incorrect optimizations.
126	 */
127	if (__excepts & FE_INVALID) {
128		d = 0.0;
129		d = 0.0 / d;
130	}
131	if (__excepts & FE_DIVBYZERO) {
132		d = 0.0;
133		d = 1.0 / d;
134	}
135	if (__excepts & FE_OVERFLOW) {
136		d = 0x1.ffp1023;
137		d *= 2.0;
138	}
139	if (__excepts & FE_UNDERFLOW) {
140		d = 0x1p-1022;
141		d /= 0x1p1023;
142	}
143	if (__excepts & FE_INEXACT) {
144		d = 0x1p-1022;
145		d += 1.0;
146	}
147	return (0);
148}
149
150__fenv_static inline int
151fetestexcept(int __excepts)
152{
153	fenv_t __fpsr;
154
155	__stfpsr(&__fpsr);
156	return ((__fpsr >> _FPUSW_SHIFT) & __excepts);
157}
158
159
160__fenv_static inline int
161fegetround(void)
162{
163	fenv_t __fpsr;
164
165	__stfpsr(&__fpsr);
166	return (__fpsr & _ROUND_MASK);
167}
168
169__fenv_static inline int
170fesetround(int __round)
171{
172	fenv_t __fpsr;
173
174	if (__round & ~_ROUND_MASK)
175		return (-1);
176	__stfpsr(&__fpsr);
177	__fpsr &= ~_ROUND_MASK;
178	__fpsr |= __round;
179	__ldfpsr(__fpsr);
180	return (0);
181}
182
183__fenv_static inline int
184fegetenv(fenv_t *__envp)
185{
186
187	__stfpsr(__envp);
188	return (0);
189}
190
191__fenv_static inline int
192feholdexcept(fenv_t *__envp)
193{
194	fenv_t __fpsr;
195
196	__stfpsr(&__fpsr);
197	*__envp = __fpsr;
198	__fpsr &= ~((fenv_t)FE_ALL_EXCEPT << _FPUSW_SHIFT);
199	__fpsr |= FE_ALL_EXCEPT;
200	__ldfpsr(__fpsr);
201	return (0);
202}
203
204__fenv_static inline int
205fesetenv(const fenv_t *__envp)
206{
207
208	__ldfpsr(*__envp);
209	return (0);
210}
211
212int feupdateenv(const fenv_t *__envp);
213
214#if __GNUC_PREREQ__(8, 0)
215#pragma GCC diagnostic pop
216#endif
217
218#if defined(_NETBSD_SOURCE) || defined(_GNU_SOURCE)
219
220__fenv_static inline int
221feenableexcept(int __mask)
222{
223	fenv_t __newfpsr, __oldfpsr;
224
225	__stfpsr(&__oldfpsr);
226	__newfpsr = __oldfpsr & ~(__mask & FE_ALL_EXCEPT);
227	__ldfpsr(__newfpsr);
228	return (~__oldfpsr & FE_ALL_EXCEPT);
229}
230
231__fenv_static inline int
232fedisableexcept(int __mask)
233{
234	fenv_t __newfpsr, __oldfpsr;
235
236	__stfpsr(&__oldfpsr);
237	__newfpsr = __oldfpsr | (__mask & FE_ALL_EXCEPT);
238	__ldfpsr(__newfpsr);
239	return (~__oldfpsr & FE_ALL_EXCEPT);
240}
241
242__fenv_static inline int
243fegetexcept(void)
244{
245	fenv_t __fpsr;
246
247	__stfpsr(&__fpsr);
248	return (~__fpsr & FE_ALL_EXCEPT);
249}
250
251#endif /* _NETBSD_SOURCE || _GNU_SOURCE */
252
253__END_DECLS
254
255#endif	/* !_IA64_FENV_H_ */
256