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_OVERFLOW
55 #define FP_EX_OVERFLOW 0
56 #endif
57 #ifndef FP_EX_UNDERFLOW
58 #define FP_EX_UNDERFLOW
59 #endif
60 #ifndef FP_EX_DIVZERO
61 #define FP_EX_DIVZERO 0
62 #endif
63 #ifndef FP_EX_INEXACT
64 #define FP_EX_INEXACT 0
65 #endif
66 #ifndef FP_EX_DENORM
67 #define FP_EX_DENORM 0
68 #endif
69
70 #ifdef _FP_DECL_EX
71 #define FP_DECL_EX \
72 int _fex = 0; \
73 _FP_DECL_EX
74 #else
75 #define FP_DECL_EX int _fex = 0
76 #endif
77
78 #ifndef FP_INIT_ROUNDMODE
79 #define FP_INIT_ROUNDMODE do {} while (0)
80 #endif
81
82 #ifndef FP_HANDLE_EXCEPTIONS
83 #define FP_HANDLE_EXCEPTIONS do {} while (0)
84 #endif
85
86 /* By default we never flush denormal input operands to signed zero. */
87 #ifndef FP_DENORM_ZERO
88 #define FP_DENORM_ZERO 0
89 #endif
90
91 #ifndef FP_INHIBIT_RESULTS
92 /* By default we write the results always.
93 * sfp-machine may override this and e.g.
94 * check if some exceptions are unmasked
95 * and inhibit it in such a case.
96 */
97 #define FP_INHIBIT_RESULTS 0
98 #endif
99
100 #ifndef FP_TRAPPING_EXCEPTIONS
101 #define FP_TRAPPING_EXCEPTIONS 0
102 #endif
103
104 #define FP_SET_EXCEPTION(ex) \
105 _fex |= (ex)
106
107 #define FP_UNSET_EXCEPTION(ex) \
108 _fex &= ~(ex)
109
110 #define FP_CUR_EXCEPTIONS \
111 (_fex)
112
113 #define FP_CLEAR_EXCEPTIONS \
114 _fex = 0
115
116 #define _FP_ROUND_NEAREST(wc, X) \
117 do { \
118 if ((_FP_FRAC_LOW_##wc(X) & 15) != _FP_WORK_ROUND) \
119 _FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND); \
120 } while (0)
121
122 #define _FP_ROUND_ZERO(wc, X) 0
123
124 #define _FP_ROUND_PINF(wc, X) \
125 do { \
126 if (!X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
127 _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
128 } while (0)
129
130 #define _FP_ROUND_MINF(wc, X) \
131 do { \
132 if (X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
133 _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
134 } while (0)
135
136 #define _FP_ROUND(wc, X) \
137 do { \
138 if (_FP_FRAC_LOW_##wc(X) & 7) \
139 FP_SET_EXCEPTION(FP_EX_INEXACT); \
140 switch (FP_ROUNDMODE) \
141 { \
142 case FP_RND_NEAREST: \
143 _FP_ROUND_NEAREST(wc,X); \
144 break; \
145 case FP_RND_ZERO: \
146 _FP_ROUND_ZERO(wc,X); \
147 break; \
148 case FP_RND_PINF: \
149 _FP_ROUND_PINF(wc,X); \
150 break; \
151 case FP_RND_MINF: \
152 _FP_ROUND_MINF(wc,X); \
153 break; \
154 } \
155 } while (0)
156
157 #define FP_CLS_NORMAL 0
158 #define FP_CLS_ZERO 1
159 #define FP_CLS_INF 2
160 #define FP_CLS_NAN 3
161
162 #define _FP_CLS_COMBINE(x,y) (((x) << 2) | (y))
163
164 #include <math-emu/op-1.h>
165 #include <math-emu/op-2.h>
166 #include <math-emu/op-4.h>
167 #include <math-emu/op-8.h>
168 #include <math-emu/op-common.h>
169
170 /* Sigh. Silly things longlong.h needs. */
171 #define UWtype _FP_W_TYPE
172 #define W_TYPE_SIZE _FP_W_TYPE_SIZE
173
174 typedef int SItype __attribute__((mode(SI)));
175 typedef int DItype __attribute__((mode(DI)));
176 typedef unsigned int USItype __attribute__((mode(SI)));
177 typedef unsigned int UDItype __attribute__((mode(DI)));
178 #if _FP_W_TYPE_SIZE == 32
179 typedef unsigned int UHWtype __attribute__((mode(HI)));
180 #elif _FP_W_TYPE_SIZE == 64
181 typedef USItype UHWtype;
182 #endif
183
184 #ifndef umul_ppmm
185 #include <stdlib/longlong.h>
186 #endif
187
188 #endif /* __MATH_EMU_SOFT_FP_H__ */
189
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