projects/linux·blob master · refs

207 lines · 5.1 KiB

1/* Software floating-point emulation.
2 Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Richard Henderson ([email protected]),
5 Jakub Jelinek ([email protected]),
6 David S. Miller ([email protected]) and
7 Peter Maydell ([email protected]).
8
9 The GNU C Library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Library General Public License as
11 published by the Free Software Foundation; either version 2 of the
12 License, or (at your option) any later version.
13
14 The GNU C Library is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Library General Public License for more details.
18
19 You should have received a copy of the GNU Library General Public
20 License along with the GNU C Library; see the file COPYING.LIB. If
21 not, write to the Free Software Foundation, Inc.,
22 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
23
24#ifndef __MATH_EMU_SOFT_FP_H__
25#define __MATH_EMU_SOFT_FP_H__
26
27#include <asm/sfp-machine.h>
28
29/* Allow sfp-machine to have its own byte order definitions. */
30#ifndef __BYTE_ORDER
31#include <endian.h>
32#endif
33
34#define _FP_WORKBITS 3
35#define _FP_WORK_LSB ((_FP_W_TYPE)1 << 3)
36#define _FP_WORK_ROUND ((_FP_W_TYPE)1 << 2)
37#define _FP_WORK_GUARD ((_FP_W_TYPE)1 << 1)
38#define _FP_WORK_STICKY ((_FP_W_TYPE)1 << 0)
39
40#ifndef FP_RND_NEAREST
41# define FP_RND_NEAREST 0
42# define FP_RND_ZERO 1
43# define FP_RND_PINF 2
44# define FP_RND_MINF 3
45#ifndef FP_ROUNDMODE
46# define FP_ROUNDMODE FP_RND_NEAREST
47#endif
48#endif
49
50/* By default don't care about exceptions. */
51#ifndef FP_EX_INVALID
52#define FP_EX_INVALID 0
53#endif
54#ifndef FP_EX_INVALID_SNAN
55#define FP_EX_INVALID_SNAN 0
56#endif
57/* inf - inf */
58#ifndef FP_EX_INVALID_ISI
59#define FP_EX_INVALID_ISI 0
60#endif
61/* inf / inf */
62#ifndef FP_EX_INVALID_IDI
63#define FP_EX_INVALID_IDI 0
64#endif
65/* 0 / 0 */
66#ifndef FP_EX_INVALID_ZDZ
67#define FP_EX_INVALID_ZDZ 0
68#endif
69/* inf * 0 */
70#ifndef FP_EX_INVALID_IMZ
71#define FP_EX_INVALID_IMZ 0
72#endif
73#ifndef FP_EX_OVERFLOW
74#define FP_EX_OVERFLOW 0
75#endif
76#ifndef FP_EX_UNDERFLOW
77#define FP_EX_UNDERFLOW
78#endif
79#ifndef FP_EX_DIVZERO
80#define FP_EX_DIVZERO 0
81#endif
82#ifndef FP_EX_INEXACT
83#define FP_EX_INEXACT 0
84#endif
85#ifndef FP_EX_DENORM
86#define FP_EX_DENORM 0
87#endif
88
89#ifdef _FP_DECL_EX
90#define FP_DECL_EX \
91 int _fex = 0; \
92 _FP_DECL_EX
93#else
94#define FP_DECL_EX int _fex = 0
95#endif
96
97#ifndef FP_INIT_ROUNDMODE
98#define FP_INIT_ROUNDMODE do {} while (0)
99#endif
100
101#ifndef FP_HANDLE_EXCEPTIONS
102#define FP_HANDLE_EXCEPTIONS do {} while (0)
103#endif
104
105/* By default we never flush denormal input operands to signed zero. */
106#ifndef FP_DENORM_ZERO
107#define FP_DENORM_ZERO 0
108#endif
109
110#ifndef FP_INHIBIT_RESULTS
111/* By default we write the results always.
112 * sfp-machine may override this and e.g.
113 * check if some exceptions are unmasked
114 * and inhibit it in such a case.
115 */
116#define FP_INHIBIT_RESULTS 0
117#endif
118
119#ifndef FP_TRAPPING_EXCEPTIONS
120#define FP_TRAPPING_EXCEPTIONS 0
121#endif
122
123#define FP_SET_EXCEPTION(ex) \
124 _fex |= (ex)
125
126#define FP_UNSET_EXCEPTION(ex) \
127 _fex &= ~(ex)
128
129#define FP_CUR_EXCEPTIONS \
130 (_fex)
131
132#define FP_CLEAR_EXCEPTIONS \
133 _fex = 0
134
135#define _FP_ROUND_NEAREST(wc, X) \
136do { \
137 if ((_FP_FRAC_LOW_##wc(X) & 15) != _FP_WORK_ROUND) \
138 _FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND); \
139} while (0)
140
141#define _FP_ROUND_ZERO(wc, X) (void)0
142
143#define _FP_ROUND_PINF(wc, X) \
144do { \
145 if (!X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
146 _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
147} while (0)
148
149#define _FP_ROUND_MINF(wc, X) \
150do { \
151 if (X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
152 _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
153} while (0)
154
155#define _FP_ROUND(wc, X) \
156do { \
157 if (_FP_FRAC_LOW_##wc(X) & 7) \
158 FP_SET_EXCEPTION(FP_EX_INEXACT); \
159 switch (FP_ROUNDMODE) \
160 { \
161 case FP_RND_NEAREST: \
162 _FP_ROUND_NEAREST(wc,X); \
163 break; \
164 case FP_RND_ZERO: \
165 _FP_ROUND_ZERO(wc,X); \
166 break; \
167 case FP_RND_PINF: \
168 _FP_ROUND_PINF(wc,X); \
169 break; \
170 case FP_RND_MINF: \
171 _FP_ROUND_MINF(wc,X); \
172 break; \
173 } \
174} while (0)
175
176#define FP_CLS_NORMAL 0
177#define FP_CLS_ZERO 1
178#define FP_CLS_INF 2
179#define FP_CLS_NAN 3
180
181#define _FP_CLS_COMBINE(x,y) (((x) << 2) | (y))
182
183#include <math-emu/op-1.h>
184#include <math-emu/op-2.h>
185#include <math-emu/op-4.h>
186#include <math-emu/op-8.h>
187#include <math-emu/op-common.h>
188
189/* Sigh. Silly things longlong.h needs. */
190#define UWtype _FP_W_TYPE
191#define W_TYPE_SIZE _FP_W_TYPE_SIZE
192
193typedef int SItype __attribute__((mode(SI)));
194typedef int DItype __attribute__((mode(DI)));
195typedef unsigned int USItype __attribute__((mode(SI)));
196typedef unsigned int UDItype __attribute__((mode(DI)));
197#if _FP_W_TYPE_SIZE == 32
198typedef unsigned int UHWtype __attribute__((mode(HI)));
199#elif _FP_W_TYPE_SIZE == 64
200typedef USItype UHWtype;
201#endif
202
203#ifndef umul_ppmm
204#include <stdlib/longlong.h>
205#endif
206
207#endif /* __MATH_EMU_SOFT_FP_H__ */