1 | /* Software floating-point emulation. |
2 | Definitions for IEEE Half Precision. |
3 | Copyright (C) 1997-2022 Free Software Foundation, Inc. |
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 | <https://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 |
78 | } bits; |
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 | #define FP_CMP_EQ_H(r, X, Y, ex) _FP_CMP_EQ (H, 1, (r), X, Y, (ex)) |
171 | |
172 | #endif /* !SOFT_FP_HALF_H */ |
173 | |