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87ab10d6 JG |
1 | /* Software floating-point emulation. |
2 | Definitions for IEEE Half Precision. | |
04277e02 | 3 | Copyright (C) 1997-2019 Free Software Foundation, Inc. |
87ab10d6 JG |
4 | This file is part of the GNU C Library. |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | In addition to the permissions in the GNU Lesser General Public | |
12 | License, the Free Software Foundation gives you unlimited | |
13 | permission to link the compiled version of this file into | |
14 | combinations with other programs, and to distribute those | |
15 | combinations without any restriction coming from the use of this | |
16 | file. (The Lesser General Public License restrictions do apply in | |
17 | other respects; for example, they cover modification of the file, | |
18 | and distribution when not linked into a combine executable.) | |
19 | ||
20 | The GNU C Library is distributed in the hope that it will be useful, | |
21 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
23 | Lesser General Public License for more details. | |
24 | ||
25 | You should have received a copy of the GNU Lesser General Public | |
26 | License along with the GNU C Library; if not, see | |
27 | <http://www.gnu.org/licenses/>. */ | |
28 | ||
29 | #ifndef SOFT_FP_HALF_H | |
30 | #define SOFT_FP_HALF_H 1 | |
31 | ||
32 | #if _FP_W_TYPE_SIZE < 32 | |
33 | # error "Here's a nickel kid. Go buy yourself a real computer." | |
34 | #endif | |
35 | ||
36 | #define _FP_FRACTBITS_H (_FP_W_TYPE_SIZE) | |
37 | ||
38 | #define _FP_FRACTBITS_DW_H (_FP_W_TYPE_SIZE) | |
39 | ||
40 | #define _FP_FRACBITS_H 11 | |
41 | #define _FP_FRACXBITS_H (_FP_FRACTBITS_H - _FP_FRACBITS_H) | |
42 | #define _FP_WFRACBITS_H (_FP_WORKBITS + _FP_FRACBITS_H) | |
43 | #define _FP_WFRACXBITS_H (_FP_FRACTBITS_H - _FP_WFRACBITS_H) | |
44 | #define _FP_EXPBITS_H 5 | |
45 | #define _FP_EXPBIAS_H 15 | |
46 | #define _FP_EXPMAX_H 31 | |
47 | ||
48 | #define _FP_QNANBIT_H ((_FP_W_TYPE) 1 << (_FP_FRACBITS_H-2)) | |
49 | #define _FP_QNANBIT_SH_H ((_FP_W_TYPE) 1 << (_FP_FRACBITS_H-2+_FP_WORKBITS)) | |
50 | #define _FP_IMPLBIT_H ((_FP_W_TYPE) 1 << (_FP_FRACBITS_H-1)) | |
51 | #define _FP_IMPLBIT_SH_H ((_FP_W_TYPE) 1 << (_FP_FRACBITS_H-1+_FP_WORKBITS)) | |
52 | #define _FP_OVERFLOW_H ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_H)) | |
53 | ||
54 | #define _FP_WFRACBITS_DW_H (2 * _FP_WFRACBITS_H) | |
55 | #define _FP_WFRACXBITS_DW_H (_FP_FRACTBITS_DW_H - _FP_WFRACBITS_DW_H) | |
56 | #define _FP_HIGHBIT_DW_H \ | |
57 | ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_H - 1) % _FP_W_TYPE_SIZE) | |
58 | ||
59 | /* The implementation of _FP_MUL_MEAT_H and _FP_DIV_MEAT_H should be | |
60 | chosen by the target machine. */ | |
61 | ||
62 | typedef float HFtype __attribute__ ((mode (HF))); | |
63 | ||
64 | union _FP_UNION_H | |
65 | { | |
66 | HFtype flt; | |
67 | struct _FP_STRUCT_LAYOUT | |
68 | { | |
69 | #if __BYTE_ORDER == __BIG_ENDIAN | |
70 | unsigned sign : 1; | |
71 | unsigned exp : _FP_EXPBITS_H; | |
72 | unsigned frac : _FP_FRACBITS_H - (_FP_IMPLBIT_H != 0); | |
73 | #else | |
74 | unsigned frac : _FP_FRACBITS_H - (_FP_IMPLBIT_H != 0); | |
75 | unsigned exp : _FP_EXPBITS_H; | |
76 | unsigned sign : 1; | |
77 | #endif | |
049375e2 | 78 | } bits; |
87ab10d6 JG |
79 | }; |
80 | ||
81 | #define FP_DECL_H(X) _FP_DECL (1, X) | |
82 | #define FP_UNPACK_RAW_H(X, val) _FP_UNPACK_RAW_1 (H, X, (val)) | |
83 | #define FP_UNPACK_RAW_HP(X, val) _FP_UNPACK_RAW_1_P (H, X, (val)) | |
84 | #define FP_PACK_RAW_H(val, X) _FP_PACK_RAW_1 (H, (val), X) | |
85 | #define FP_PACK_RAW_HP(val, X) \ | |
86 | do \ | |
87 | { \ | |
88 | if (!FP_INHIBIT_RESULTS) \ | |
89 | _FP_PACK_RAW_1_P (H, (val), X); \ | |
90 | } \ | |
91 | while (0) | |
92 | ||
93 | #define FP_UNPACK_H(X, val) \ | |
94 | do \ | |
95 | { \ | |
96 | _FP_UNPACK_RAW_1 (H, X, (val)); \ | |
97 | _FP_UNPACK_CANONICAL (H, 1, X); \ | |
98 | } \ | |
99 | while (0) | |
100 | ||
101 | #define FP_UNPACK_HP(X, val) \ | |
102 | do \ | |
103 | { \ | |
104 | _FP_UNPACK_RAW_1_P (H, X, (val)); \ | |
105 | _FP_UNPACK_CANONICAL (H, 1, X); \ | |
106 | } \ | |
107 | while (0) | |
108 | ||
109 | #define FP_UNPACK_SEMIRAW_H(X, val) \ | |
110 | do \ | |
111 | { \ | |
112 | _FP_UNPACK_RAW_1 (H, X, (val)); \ | |
113 | _FP_UNPACK_SEMIRAW (H, 1, X); \ | |
114 | } \ | |
115 | while (0) | |
116 | ||
117 | #define FP_UNPACK_SEMIRAW_HP(X, val) \ | |
118 | do \ | |
119 | { \ | |
120 | _FP_UNPACK_RAW_1_P (H, X, (val)); \ | |
121 | _FP_UNPACK_SEMIRAW (H, 1, X); \ | |
122 | } \ | |
123 | while (0) | |
124 | ||
125 | #define FP_PACK_H(val, X) \ | |
126 | do \ | |
127 | { \ | |
128 | _FP_PACK_CANONICAL (H, 1, X); \ | |
129 | _FP_PACK_RAW_1 (H, (val), X); \ | |
130 | } \ | |
131 | while (0) | |
132 | ||
133 | #define FP_PACK_HP(val, X) \ | |
134 | do \ | |
135 | { \ | |
136 | _FP_PACK_CANONICAL (H, 1, X); \ | |
137 | if (!FP_INHIBIT_RESULTS) \ | |
138 | _FP_PACK_RAW_1_P (H, (val), X); \ | |
139 | } \ | |
140 | while (0) | |
141 | ||
142 | #define FP_PACK_SEMIRAW_H(val, X) \ | |
143 | do \ | |
144 | { \ | |
145 | _FP_PACK_SEMIRAW (H, 1, X); \ | |
146 | _FP_PACK_RAW_1 (H, (val), X); \ | |
147 | } \ | |
148 | while (0) | |
149 | ||
150 | #define FP_PACK_SEMIRAW_HP(val, X) \ | |
151 | do \ | |
152 | { \ | |
153 | _FP_PACK_SEMIRAW (H, 1, X); \ | |
154 | if (!FP_INHIBIT_RESULTS) \ | |
155 | _FP_PACK_RAW_1_P (H, (val), X); \ | |
156 | } \ | |
157 | while (0) | |
158 | ||
159 | #define FP_TO_INT_H(r, X, rsz, rsg) _FP_TO_INT (H, 1, (r), X, (rsz), (rsg)) | |
160 | #define FP_TO_INT_ROUND_H(r, X, rsz, rsg) \ | |
161 | _FP_TO_INT_ROUND (H, 1, (r), X, (rsz), (rsg)) | |
162 | #define FP_FROM_INT_H(X, r, rs, rt) _FP_FROM_INT (H, 1, X, (r), (rs), rt) | |
163 | ||
164 | /* HFmode arithmetic is not implemented. */ | |
165 | ||
166 | #define _FP_FRAC_HIGH_H(X) _FP_FRAC_HIGH_1 (X) | |
167 | #define _FP_FRAC_HIGH_RAW_H(X) _FP_FRAC_HIGH_1 (X) | |
168 | #define _FP_FRAC_HIGH_DW_H(X) _FP_FRAC_HIGH_1 (X) | |
169 | ||
170 | #endif /* !SOFT_FP_HALF_H */ |