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d876f532 UD |
1 | /* Software floating-point emulation. |
2 | Basic eight-word fraction declaration and manipulation. | |
b168057a | 3 | Copyright (C) 1997-2015 Free Software Foundation, Inc. |
d876f532 UD |
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) and | |
7 | Peter Maydell (pmaydell@chiark.greenend.org.uk). | |
41bdb6e2 | 8 | |
d876f532 | 9 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
10 | modify it under the terms of the GNU Lesser General Public |
11 | License as published by the Free Software Foundation; either | |
12 | version 2.1 of the License, or (at your option) any later version. | |
d876f532 | 13 | |
638a783c RM |
14 | In addition to the permissions in the GNU Lesser General Public |
15 | License, the Free Software Foundation gives you unlimited | |
16 | permission to link the compiled version of this file into | |
17 | combinations with other programs, and to distribute those | |
18 | combinations without any restriction coming from the use of this | |
19 | file. (The Lesser General Public License restrictions do apply in | |
20 | other respects; for example, they cover modification of the file, | |
21 | and distribution when not linked into a combine executable.) | |
22 | ||
d876f532 UD |
23 | The GNU C Library is distributed in the hope that it will be useful, |
24 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 26 | Lesser General Public License for more details. |
d876f532 | 27 | |
41bdb6e2 | 28 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
29 | License along with the GNU C Library; if not, see |
30 | <http://www.gnu.org/licenses/>. */ | |
d876f532 | 31 | |
a2f8be9c JM |
32 | #ifndef SOFT_FP_OP_8_H |
33 | #define SOFT_FP_OP_8_H 1 | |
34 | ||
d876f532 | 35 | /* We need just a few things from here for op-4, if we ever need some |
c4fe3ea7 | 36 | other macros, they can be added. */ |
d876f532 UD |
37 | #define _FP_FRAC_DECL_8(X) _FP_W_TYPE X##_f[8] |
38 | #define _FP_FRAC_HIGH_8(X) (X##_f[7]) | |
39 | #define _FP_FRAC_LOW_8(X) (X##_f[0]) | |
51ca9e29 | 40 | #define _FP_FRAC_WORD_8(X, w) (X##_f[w]) |
d876f532 | 41 | |
3a6e9887 JM |
42 | #define _FP_FRAC_SLL_8(X, N) \ |
43 | do \ | |
44 | { \ | |
45 | _FP_I_TYPE _FP_FRAC_SLL_8_up, _FP_FRAC_SLL_8_down; \ | |
46 | _FP_I_TYPE _FP_FRAC_SLL_8_skip, _FP_FRAC_SLL_8_i; \ | |
47 | _FP_FRAC_SLL_8_skip = (N) / _FP_W_TYPE_SIZE; \ | |
48 | _FP_FRAC_SLL_8_up = (N) % _FP_W_TYPE_SIZE; \ | |
49 | _FP_FRAC_SLL_8_down = _FP_W_TYPE_SIZE - _FP_FRAC_SLL_8_up; \ | |
50 | if (!_FP_FRAC_SLL_8_up) \ | |
51 | for (_FP_FRAC_SLL_8_i = 7; \ | |
52 | _FP_FRAC_SLL_8_i >= _FP_FRAC_SLL_8_skip; \ | |
53 | --_FP_FRAC_SLL_8_i) \ | |
54 | X##_f[_FP_FRAC_SLL_8_i] \ | |
55 | = X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip]; \ | |
56 | else \ | |
57 | { \ | |
58 | for (_FP_FRAC_SLL_8_i = 7; \ | |
59 | _FP_FRAC_SLL_8_i > _FP_FRAC_SLL_8_skip; \ | |
60 | --_FP_FRAC_SLL_8_i) \ | |
61 | X##_f[_FP_FRAC_SLL_8_i] \ | |
62 | = ((X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip] \ | |
63 | << _FP_FRAC_SLL_8_up) \ | |
64 | | (X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip-1] \ | |
65 | >> _FP_FRAC_SLL_8_down)); \ | |
66 | X##_f[_FP_FRAC_SLL_8_i--] = X##_f[0] << _FP_FRAC_SLL_8_up; \ | |
67 | } \ | |
68 | for (; _FP_FRAC_SLL_8_i >= 0; --_FP_FRAC_SLL_8_i) \ | |
69 | X##_f[_FP_FRAC_SLL_8_i] = 0; \ | |
70 | } \ | |
1e145589 | 71 | while (0) |
d876f532 | 72 | |
3a6e9887 JM |
73 | #define _FP_FRAC_SRL_8(X, N) \ |
74 | do \ | |
75 | { \ | |
76 | _FP_I_TYPE _FP_FRAC_SRL_8_up, _FP_FRAC_SRL_8_down; \ | |
77 | _FP_I_TYPE _FP_FRAC_SRL_8_skip, _FP_FRAC_SRL_8_i; \ | |
78 | _FP_FRAC_SRL_8_skip = (N) / _FP_W_TYPE_SIZE; \ | |
79 | _FP_FRAC_SRL_8_down = (N) % _FP_W_TYPE_SIZE; \ | |
80 | _FP_FRAC_SRL_8_up = _FP_W_TYPE_SIZE - _FP_FRAC_SRL_8_down; \ | |
81 | if (!_FP_FRAC_SRL_8_down) \ | |
82 | for (_FP_FRAC_SRL_8_i = 0; \ | |
83 | _FP_FRAC_SRL_8_i <= 7-_FP_FRAC_SRL_8_skip; \ | |
84 | ++_FP_FRAC_SRL_8_i) \ | |
85 | X##_f[_FP_FRAC_SRL_8_i] \ | |
86 | = X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip]; \ | |
87 | else \ | |
88 | { \ | |
89 | for (_FP_FRAC_SRL_8_i = 0; \ | |
90 | _FP_FRAC_SRL_8_i < 7-_FP_FRAC_SRL_8_skip; \ | |
91 | ++_FP_FRAC_SRL_8_i) \ | |
92 | X##_f[_FP_FRAC_SRL_8_i] \ | |
93 | = ((X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip] \ | |
94 | >> _FP_FRAC_SRL_8_down) \ | |
95 | | (X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip+1] \ | |
96 | << _FP_FRAC_SRL_8_up)); \ | |
97 | X##_f[_FP_FRAC_SRL_8_i++] = X##_f[7] >> _FP_FRAC_SRL_8_down; \ | |
98 | } \ | |
99 | for (; _FP_FRAC_SRL_8_i < 8; ++_FP_FRAC_SRL_8_i) \ | |
100 | X##_f[_FP_FRAC_SRL_8_i] = 0; \ | |
101 | } \ | |
1e145589 | 102 | while (0) |
d876f532 UD |
103 | |
104 | ||
9c84384c | 105 | /* Right shift with sticky-lsb. |
c4fe3ea7 JM |
106 | What this actually means is that we do a standard right-shift, |
107 | but that if any of the bits that fall off the right hand side | |
108 | were one then we always set the LSbit. */ | |
51ca9e29 | 109 | #define _FP_FRAC_SRS_8(X, N, size) \ |
1e145589 JM |
110 | do \ |
111 | { \ | |
3a6e9887 JM |
112 | _FP_I_TYPE _FP_FRAC_SRS_8_up, _FP_FRAC_SRS_8_down; \ |
113 | _FP_I_TYPE _FP_FRAC_SRS_8_skip, _FP_FRAC_SRS_8_i; \ | |
114 | _FP_W_TYPE _FP_FRAC_SRS_8_s; \ | |
115 | _FP_FRAC_SRS_8_skip = (N) / _FP_W_TYPE_SIZE; \ | |
116 | _FP_FRAC_SRS_8_down = (N) % _FP_W_TYPE_SIZE; \ | |
117 | _FP_FRAC_SRS_8_up = _FP_W_TYPE_SIZE - _FP_FRAC_SRS_8_down; \ | |
118 | for (_FP_FRAC_SRS_8_s = _FP_FRAC_SRS_8_i = 0; \ | |
119 | _FP_FRAC_SRS_8_i < _FP_FRAC_SRS_8_skip; \ | |
120 | ++_FP_FRAC_SRS_8_i) \ | |
121 | _FP_FRAC_SRS_8_s |= X##_f[_FP_FRAC_SRS_8_i]; \ | |
122 | if (!_FP_FRAC_SRS_8_down) \ | |
123 | for (_FP_FRAC_SRS_8_i = 0; \ | |
124 | _FP_FRAC_SRS_8_i <= 7-_FP_FRAC_SRS_8_skip; \ | |
125 | ++_FP_FRAC_SRS_8_i) \ | |
126 | X##_f[_FP_FRAC_SRS_8_i] \ | |
127 | = X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip]; \ | |
1e145589 JM |
128 | else \ |
129 | { \ | |
3a6e9887 JM |
130 | _FP_FRAC_SRS_8_s \ |
131 | |= X##_f[_FP_FRAC_SRS_8_i] << _FP_FRAC_SRS_8_up; \ | |
132 | for (_FP_FRAC_SRS_8_i = 0; \ | |
133 | _FP_FRAC_SRS_8_i < 7-_FP_FRAC_SRS_8_skip; \ | |
134 | ++_FP_FRAC_SRS_8_i) \ | |
135 | X##_f[_FP_FRAC_SRS_8_i] \ | |
136 | = ((X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip] \ | |
137 | >> _FP_FRAC_SRS_8_down) \ | |
138 | | (X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip+1] \ | |
139 | << _FP_FRAC_SRS_8_up)); \ | |
140 | X##_f[_FP_FRAC_SRS_8_i++] = X##_f[7] >> _FP_FRAC_SRS_8_down; \ | |
1e145589 | 141 | } \ |
3a6e9887 JM |
142 | for (; _FP_FRAC_SRS_8_i < 8; ++_FP_FRAC_SRS_8_i) \ |
143 | X##_f[_FP_FRAC_SRS_8_i] = 0; \ | |
c4fe3ea7 JM |
144 | /* Don't fix the LSB until the very end when we're sure f[0] is \ |
145 | stable. */ \ | |
3a6e9887 | 146 | X##_f[0] |= (_FP_FRAC_SRS_8_s != 0); \ |
1e145589 JM |
147 | } \ |
148 | while (0) | |
a2f8be9c JM |
149 | |
150 | #endif /* !SOFT_FP_OP_8_H */ |