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 (rth@cygnus.com),
5 Jakub Jelinek (jj@ultra.linux.cz),
6 David S. Miller (davem@redhat.com) and
7 Peter Maydell (pmaydell@chiark.greenend.org.uk).
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) \
136 do { \
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) \
144 do { \
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) \
150 do { \
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) \
156 do { \
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
193 typedef int SItype __attribute__((mode(SI)));
194 typedef int DItype __attribute__((mode(DI)));
195 typedef unsigned int USItype __attribute__((mode(SI)));
196 typedef unsigned int UDItype __attribute__((mode(DI)));
197 #if _FP_W_TYPE_SIZE == 32
198 typedef unsigned int UHWtype __attribute__((mode(HI)));
199 #elif _FP_W_TYPE_SIZE == 64
200 typedef USItype UHWtype;
201 #endif
202
203 #ifndef umul_ppmm
204 #include <stdlib/longlong.h>
205 #endif
206
207 #endif /* __MATH_EMU_SOFT_FP_H__ */
208
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