1 /* Software floating-point emulation.
2 Definitions for IEEE Double Precision
3 Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Richard Henderson (rth@cygnus.com),
6 Jakub Jelinek (jj@ultra.linux.cz),
7 David S. Miller (davem@redhat.com) and
8 Peter Maydell (pmaydell@chiark.greenend.org.uk).
9
10 The GNU C Library is free software; you can redistribute it and/or
11 modify it under the terms of the GNU Library General Public License as
12 published by the Free Software Foundation; either version 2 of the
13 License, or (at your option) any later version.
14
15 The GNU C Library is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Library General Public License for more details.
19
20 You should have received a copy of the GNU Library General Public
21 License along with the GNU C Library; see the file COPYING.LIB. If
22 not, write to the Free Software Foundation, Inc.,
23 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
24
25 #if _FP_W_TYPE_SIZE < 32
26 #error "Here's a nickel kid. Go buy yourself a real computer."
27 #endif
28
29 #if _FP_W_TYPE_SIZE < 64
30 #define _FP_FRACTBITS_D (2 * _FP_W_TYPE_SIZE)
31 #else
32 #define _FP_FRACTBITS_D _FP_W_TYPE_SIZE
33 #endif
34
35 #define _FP_FRACBITS_D 53
36 #define _FP_FRACXBITS_D (_FP_FRACTBITS_D - _FP_FRACBITS_D)
37 #define _FP_WFRACBITS_D (_FP_WORKBITS + _FP_FRACBITS_D)
38 #define _FP_WFRACXBITS_D (_FP_FRACTBITS_D - _FP_WFRACBITS_D)
39 #define _FP_EXPBITS_D 11
40 #define _FP_EXPBIAS_D 1023
41 #define _FP_EXPMAX_D 2047
42
43 #define _FP_QNANBIT_D \
44 ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-2) % _FP_W_TYPE_SIZE)
45 #define _FP_IMPLBIT_D \
46 ((_FP_W_TYPE)1 << (_FP_FRACBITS_D-1) % _FP_W_TYPE_SIZE)
47 #define _FP_OVERFLOW_D \
48 ((_FP_W_TYPE)1 << _FP_WFRACBITS_D % _FP_W_TYPE_SIZE)
49
50 #if _FP_W_TYPE_SIZE < 64
51
52 union _FP_UNION_D
53 {
54 double flt;
55 struct {
56 #if __BYTE_ORDER == __BIG_ENDIAN
57 unsigned sign : 1;
58 unsigned exp : _FP_EXPBITS_D;
59 unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
60 unsigned frac0 : _FP_W_TYPE_SIZE;
61 #else
62 unsigned frac0 : _FP_W_TYPE_SIZE;
63 unsigned frac1 : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0) - _FP_W_TYPE_SIZE;
64 unsigned exp : _FP_EXPBITS_D;
65 unsigned sign : 1;
66 #endif
67 } bits __attribute__((packed));
68 };
69
70 #define FP_DECL_D(X) _FP_DECL(2,X)
71 #define FP_UNPACK_RAW_D(X,val) _FP_UNPACK_RAW_2(D,X,val)
72 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_2_P(D,X,val)
73 #define FP_PACK_RAW_D(val,X) _FP_PACK_RAW_2(D,val,X)
74 #define FP_PACK_RAW_DP(val,X) \
75 do { \
76 if (!FP_INHIBIT_RESULTS) \
77 _FP_PACK_RAW_2_P(D,val,X); \
78 } while (0)
79
80 #define FP_UNPACK_D(X,val) \
81 do { \
82 _FP_UNPACK_RAW_2(D,X,val); \
83 _FP_UNPACK_CANONICAL(D,2,X); \
84 } while (0)
85
86 #define FP_UNPACK_DP(X,val) \
87 do { \
88 _FP_UNPACK_RAW_2_P(D,X,val); \
89 _FP_UNPACK_CANONICAL(D,2,X); \
90 } while (0)
91
92 #define FP_PACK_D(val,X) \
93 do { \
94 _FP_PACK_CANONICAL(D,2,X); \
95 _FP_PACK_RAW_2(D,val,X); \
96 } while (0)
97
98 #define FP_PACK_DP(val,X) \
99 do { \
100 _FP_PACK_CANONICAL(D,2,X); \
101 if (!FP_INHIBIT_RESULTS) \
102 _FP_PACK_RAW_2_P(D,val,X); \
103 } while (0)
104
105 #define FP_ISSIGNAN_D(X) _FP_ISSIGNAN(D,2,X)
106 #define FP_NEG_D(R,X) _FP_NEG(D,2,R,X)
107 #define FP_ADD_D(R,X,Y) _FP_ADD(D,2,R,X,Y)
108 #define FP_SUB_D(R,X,Y) _FP_SUB(D,2,R,X,Y)
109 #define FP_MUL_D(R,X,Y) _FP_MUL(D,2,R,X,Y)
110 #define FP_DIV_D(R,X,Y) _FP_DIV(D,2,R,X,Y)
111 #define FP_SQRT_D(R,X) _FP_SQRT(D,2,R,X)
112 #define _FP_SQRT_MEAT_D(R,S,T,X,Q) _FP_SQRT_MEAT_2(R,S,T,X,Q)
113
114 #define FP_CMP_D(r,X,Y,un) _FP_CMP(D,2,r,X,Y,un)
115 #define FP_CMP_EQ_D(r,X,Y) _FP_CMP_EQ(D,2,r,X,Y)
116
117 #define FP_TO_INT_D(r,X,rsz,rsg) _FP_TO_INT(D,2,r,X,rsz,rsg)
118 #define FP_TO_INT_ROUND_D(r,X,rsz,rsg) _FP_TO_INT_ROUND(D,2,r,X,rsz,rsg)
119 #define FP_FROM_INT_D(X,r,rs,rt) _FP_FROM_INT(D,2,X,r,rs,rt)
120
121 #define _FP_FRAC_HIGH_D(X) _FP_FRAC_HIGH_2(X)
122 #define _FP_FRAC_HIGH_RAW_D(X) _FP_FRAC_HIGH_2(X)
123
124 #else
125
126 union _FP_UNION_D
127 {
128 double flt;
129 struct {
130 #if __BYTE_ORDER == __BIG_ENDIAN
131 unsigned sign : 1;
132 unsigned exp : _FP_EXPBITS_D;
133 unsigned long frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
134 #else
135 unsigned long frac : _FP_FRACBITS_D - (_FP_IMPLBIT_D != 0);
136 unsigned exp : _FP_EXPBITS_D;
137 unsigned sign : 1;
138 #endif
139 } bits __attribute__((packed));
140 };
141
142 #define FP_DECL_D(X) _FP_DECL(1,X)
143 #define FP_UNPACK_RAW_D(X,val) _FP_UNPACK_RAW_1(D,X,val)
144 #define FP_UNPACK_RAW_DP(X,val) _FP_UNPACK_RAW_1_P(D,X,val)
145 #define FP_PACK_RAW_D(val,X) _FP_PACK_RAW_1(D,val,X)
146 #define FP_PACK_RAW_DP(val,X) \
147 do { \
148 if (!FP_INHIBIT_RESULTS) \
149 _FP_PACK_RAW_1_P(D,val,X); \
150 } while (0)
151
152 #define FP_UNPACK_D(X,val) \
153 do { \
154 _FP_UNPACK_RAW_1(D,X,val); \
155 _FP_UNPACK_CANONICAL(D,1,X); \
156 } while (0)
157
158 #define FP_UNPACK_DP(X,val) \
159 do { \
160 _FP_UNPACK_RAW_1_P(D,X,val); \
161 _FP_UNPACK_CANONICAL(D,1,X); \
162 } while (0)
163
164 #define FP_PACK_D(val,X) \
165 do { \
166 _FP_PACK_CANONICAL(D,1,X); \
167 _FP_PACK_RAW_1(D,val,X); \
168 } while (0)
169
170 #define FP_PACK_DP(val,X) \
171 do { \
172 _FP_PACK_CANONICAL(D,1,X); \
173 if (!FP_INHIBIT_RESULTS) \
174 _FP_PACK_RAW_1_P(D,val,X); \
175 } while (0)
176
177 #define FP_ISSIGNAN_D(X) _FP_ISSIGNAN(D,1,X)
178 #define FP_NEG_D(R,X) _FP_NEG(D,1,R,X)
179 #define FP_ADD_D(R,X,Y) _FP_ADD(D,1,R,X,Y)
180 #define FP_SUB_D(R,X,Y) _FP_SUB(D,1,R,X,Y)
181 #define FP_MUL_D(R,X,Y) _FP_MUL(D,1,R,X,Y)
182 #define FP_DIV_D(R,X,Y) _FP_DIV(D,1,R,X,Y)
183 #define FP_SQRT_D(R,X) _FP_SQRT(D,1,R,X)
184 #define _FP_SQRT_MEAT_D(R,S,T,X,Q) _FP_SQRT_MEAT_1(R,S,T,X,Q)
185
186 /* The implementation of _FP_MUL_D and _FP_DIV_D should be chosen by
187 the target machine. */
188
189 #define FP_CMP_D(r,X,Y,un) _FP_CMP(D,1,r,X,Y,un)
190 #define FP_CMP_EQ_D(r,X,Y) _FP_CMP_EQ(D,1,r,X,Y)
191
192 #define FP_TO_INT_D(r,X,rsz,rsg) _FP_TO_INT(D,1,r,X,rsz,rsg)
193 #define FP_TO_INT_ROUND_D(r,X,rsz,rsg) _FP_TO_INT_ROUND(D,1,r,X,rsz,rsg)
194 #define FP_FROM_INT_D(X,r,rs,rt) _FP_FROM_INT(D,1,X,r,rs,rt)
195
196 #define _FP_FRAC_HIGH_D(X) _FP_FRAC_HIGH_1(X)
197 #define _FP_FRAC_HIGH_RAW_D(X) _FP_FRAC_HIGH_1(X)
198
199 #endif /* W_TYPE_SIZE < 64 */
200
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