1/* Software floating-point emulation.
2 Definitions for IEEE Single Precision.
3 Copyright (C) 1997-2024 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_SINGLE_H
30#define SOFT_FP_SINGLE_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_S _FP_W_TYPE_SIZE
37
38#if _FP_W_TYPE_SIZE < 64
39# define _FP_FRACTBITS_DW_S (2 * _FP_W_TYPE_SIZE)
40#else
41# define _FP_FRACTBITS_DW_S _FP_W_TYPE_SIZE
42#endif
43
44#define _FP_FRACBITS_S 24
45#define _FP_FRACXBITS_S (_FP_FRACTBITS_S - _FP_FRACBITS_S)
46#define _FP_WFRACBITS_S (_FP_WORKBITS + _FP_FRACBITS_S)
47#define _FP_WFRACXBITS_S (_FP_FRACTBITS_S - _FP_WFRACBITS_S)
48#define _FP_EXPBITS_S 8
49#define _FP_EXPBIAS_S 127
50#define _FP_EXPMAX_S 255
51#define _FP_QNANBIT_S ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-2))
52#define _FP_QNANBIT_SH_S ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-2+_FP_WORKBITS))
53#define _FP_IMPLBIT_S ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-1))
54#define _FP_IMPLBIT_SH_S ((_FP_W_TYPE) 1 << (_FP_FRACBITS_S-1+_FP_WORKBITS))
55#define _FP_OVERFLOW_S ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_S))
56
57#define _FP_WFRACBITS_DW_S (2 * _FP_WFRACBITS_S)
58#define _FP_WFRACXBITS_DW_S (_FP_FRACTBITS_DW_S - _FP_WFRACBITS_DW_S)
59#define _FP_HIGHBIT_DW_S \
60 ((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_S - 1) % _FP_W_TYPE_SIZE)
61
62/* The implementation of _FP_MUL_MEAT_S and _FP_DIV_MEAT_S should be
63 chosen by the target machine. */
64
65typedef float SFtype __attribute__ ((mode (SF)));
66
67union _FP_UNION_S
68{
69 SFtype flt;
70 struct _FP_STRUCT_LAYOUT
71 {
72#if __BYTE_ORDER == __BIG_ENDIAN
73 unsigned sign : 1;
74 unsigned exp : _FP_EXPBITS_S;
75 unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
76#else
77 unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
78 unsigned exp : _FP_EXPBITS_S;
79 unsigned sign : 1;
80#endif
81 } bits;
82};
83
84#define FP_DECL_S(X) _FP_DECL (1, X)
85#define FP_UNPACK_RAW_S(X, val) _FP_UNPACK_RAW_1 (S, X, (val))
86#define FP_UNPACK_RAW_SP(X, val) _FP_UNPACK_RAW_1_P (S, X, (val))
87#define FP_PACK_RAW_S(val, X) _FP_PACK_RAW_1 (S, (val), X)
88#define FP_PACK_RAW_SP(val, X) \
89 do \
90 { \
91 if (!FP_INHIBIT_RESULTS) \
92 _FP_PACK_RAW_1_P (S, (val), X); \
93 } \
94 while (0)
95
96#define FP_UNPACK_S(X, val) \
97 do \
98 { \
99 _FP_UNPACK_RAW_1 (S, X, (val)); \
100 _FP_UNPACK_CANONICAL (S, 1, X); \
101 } \
102 while (0)
103
104#define FP_UNPACK_SP(X, val) \
105 do \
106 { \
107 _FP_UNPACK_RAW_1_P (S, X, (val)); \
108 _FP_UNPACK_CANONICAL (S, 1, X); \
109 } \
110 while (0)
111
112#define FP_UNPACK_SEMIRAW_S(X, val) \
113 do \
114 { \
115 _FP_UNPACK_RAW_1 (S, X, (val)); \
116 _FP_UNPACK_SEMIRAW (S, 1, X); \
117 } \
118 while (0)
119
120#define FP_UNPACK_SEMIRAW_SP(X, val) \
121 do \
122 { \
123 _FP_UNPACK_RAW_1_P (S, X, (val)); \
124 _FP_UNPACK_SEMIRAW (S, 1, X); \
125 } \
126 while (0)
127
128#define FP_PACK_S(val, X) \
129 do \
130 { \
131 _FP_PACK_CANONICAL (S, 1, X); \
132 _FP_PACK_RAW_1 (S, (val), X); \
133 } \
134 while (0)
135
136#define FP_PACK_SP(val, X) \
137 do \
138 { \
139 _FP_PACK_CANONICAL (S, 1, X); \
140 if (!FP_INHIBIT_RESULTS) \
141 _FP_PACK_RAW_1_P (S, (val), X); \
142 } \
143 while (0)
144
145#define FP_PACK_SEMIRAW_S(val, X) \
146 do \
147 { \
148 _FP_PACK_SEMIRAW (S, 1, X); \
149 _FP_PACK_RAW_1 (S, (val), X); \
150 } \
151 while (0)
152
153#define FP_PACK_SEMIRAW_SP(val, X) \
154 do \
155 { \
156 _FP_PACK_SEMIRAW (S, 1, X); \
157 if (!FP_INHIBIT_RESULTS) \
158 _FP_PACK_RAW_1_P (S, (val), X); \
159 } \
160 while (0)
161
162#define FP_ISSIGNAN_S(X) _FP_ISSIGNAN (S, 1, X)
163#define FP_NEG_S(R, X) _FP_NEG (S, 1, R, X)
164#define FP_ADD_S(R, X, Y) _FP_ADD (S, 1, R, X, Y)
165#define FP_SUB_S(R, X, Y) _FP_SUB (S, 1, R, X, Y)
166#define FP_MUL_S(R, X, Y) _FP_MUL (S, 1, R, X, Y)
167#define FP_DIV_S(R, X, Y) _FP_DIV (S, 1, R, X, Y)
168#define FP_SQRT_S(R, X) _FP_SQRT (S, 1, R, X)
169#define _FP_SQRT_MEAT_S(R, S, T, X, Q) _FP_SQRT_MEAT_1 (R, S, T, X, (Q))
170
171#if _FP_W_TYPE_SIZE < 64
172# define FP_FMA_S(R, X, Y, Z) _FP_FMA (S, 1, 2, R, X, Y, Z)
173#else
174# define FP_FMA_S(R, X, Y, Z) _FP_FMA (S, 1, 1, R, X, Y, Z)
175#endif
176
177#define FP_CMP_S(r, X, Y, un, ex) _FP_CMP (S, 1, (r), X, Y, (un), (ex))
178#define FP_CMP_EQ_S(r, X, Y, ex) _FP_CMP_EQ (S, 1, (r), X, Y, (ex))
179#define FP_CMP_UNORD_S(r, X, Y, ex) _FP_CMP_UNORD (S, 1, (r), X, Y, (ex))
180
181#define FP_TO_INT_S(r, X, rsz, rsg) _FP_TO_INT (S, 1, (r), X, (rsz), (rsg))
182#define FP_TO_INT_ROUND_S(r, X, rsz, rsg) \
183 _FP_TO_INT_ROUND (S, 1, (r), X, (rsz), (rsg))
184#define FP_FROM_INT_S(X, r, rs, rt) _FP_FROM_INT (S, 1, X, (r), (rs), rt)
185
186#define _FP_FRAC_HIGH_S(X) _FP_FRAC_HIGH_1 (X)
187#define _FP_FRAC_HIGH_RAW_S(X) _FP_FRAC_HIGH_1 (X)
188
189#if _FP_W_TYPE_SIZE < 64
190# define _FP_FRAC_HIGH_DW_S(X) _FP_FRAC_HIGH_2 (X)
191#else
192# define _FP_FRAC_HIGH_DW_S(X) _FP_FRAC_HIGH_1 (X)
193#endif
194
195#endif /* !SOFT_FP_SINGLE_H */
196

source code of glibc/soft-fp/single.h