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1 | /* Software floating-point emulation. |
2 | Basic eight-word fraction declaration and manipulation. |
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) and |
7 | Peter Maydell (pmaydell@chiark.greenend.org.uk). |
8 | |
9 | The GNU C Library is free software; you can redistribute it and/or |
10 | modify it under the terms of the GNU Library General Public License as |
11 | published by the Free Software Foundation; either version 2 of the |
12 | License, or (at your option) any later version. |
13 | |
14 | The GNU C Library is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 | Library General Public License for more details. |
18 | |
19 | You should have received a copy of the GNU Library General Public |
20 | License along with the GNU C Library; see the file COPYING.LIB. If |
21 | not, write to the Free Software Foundation, Inc., |
22 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
23 | |
24 | #ifndef __MATH_EMU_OP_8_H__ |
25 | #define __MATH_EMU_OP_8_H__ |
26 | |
27 | /* We need just a few things from here for op-4, if we ever need some |
28 | other macros, they can be added. */ |
29 | #define _FP_FRAC_DECL_8(X) _FP_W_TYPE X##_f[8] |
30 | #define _FP_FRAC_HIGH_8(X) (X##_f[7]) |
31 | #define _FP_FRAC_LOW_8(X) (X##_f[0]) |
32 | #define _FP_FRAC_WORD_8(X,w) (X##_f[w]) |
33 | |
34 | #define _FP_FRAC_SLL_8(X,N) \ |
35 | do { \ |
36 | _FP_I_TYPE _up, _down, _skip, _i; \ |
37 | _skip = (N) / _FP_W_TYPE_SIZE; \ |
38 | _up = (N) % _FP_W_TYPE_SIZE; \ |
39 | _down = _FP_W_TYPE_SIZE - _up; \ |
40 | if (!_up) \ |
41 | for (_i = 7; _i >= _skip; --_i) \ |
42 | X##_f[_i] = X##_f[_i-_skip]; \ |
43 | else \ |
44 | { \ |
45 | for (_i = 7; _i > _skip; --_i) \ |
46 | X##_f[_i] = X##_f[_i-_skip] << _up \ |
47 | | X##_f[_i-_skip-1] >> _down; \ |
48 | X##_f[_i--] = X##_f[0] << _up; \ |
49 | } \ |
50 | for (; _i >= 0; --_i) \ |
51 | X##_f[_i] = 0; \ |
52 | } while (0) |
53 | |
54 | #define _FP_FRAC_SRL_8(X,N) \ |
55 | do { \ |
56 | _FP_I_TYPE _up, _down, _skip, _i; \ |
57 | _skip = (N) / _FP_W_TYPE_SIZE; \ |
58 | _down = (N) % _FP_W_TYPE_SIZE; \ |
59 | _up = _FP_W_TYPE_SIZE - _down; \ |
60 | if (!_down) \ |
61 | for (_i = 0; _i <= 7-_skip; ++_i) \ |
62 | X##_f[_i] = X##_f[_i+_skip]; \ |
63 | else \ |
64 | { \ |
65 | for (_i = 0; _i < 7-_skip; ++_i) \ |
66 | X##_f[_i] = X##_f[_i+_skip] >> _down \ |
67 | | X##_f[_i+_skip+1] << _up; \ |
68 | X##_f[_i++] = X##_f[7] >> _down; \ |
69 | } \ |
70 | for (; _i < 8; ++_i) \ |
71 | X##_f[_i] = 0; \ |
72 | } while (0) |
73 | |
74 | |
75 | /* Right shift with sticky-lsb. |
76 | * What this actually means is that we do a standard right-shift, |
77 | * but that if any of the bits that fall off the right hand side |
78 | * were one then we always set the LSbit. |
79 | */ |
80 | #define _FP_FRAC_SRS_8(X,N,size) \ |
81 | do { \ |
82 | _FP_I_TYPE _up, _down, _skip, _i; \ |
83 | _FP_W_TYPE _s; \ |
84 | _skip = (N) / _FP_W_TYPE_SIZE; \ |
85 | _down = (N) % _FP_W_TYPE_SIZE; \ |
86 | _up = _FP_W_TYPE_SIZE - _down; \ |
87 | for (_s = _i = 0; _i < _skip; ++_i) \ |
88 | _s |= X##_f[_i]; \ |
89 | _s |= X##_f[_i] << _up; \ |
90 | /* s is now != 0 if we want to set the LSbit */ \ |
91 | if (!_down) \ |
92 | for (_i = 0; _i <= 7-_skip; ++_i) \ |
93 | X##_f[_i] = X##_f[_i+_skip]; \ |
94 | else \ |
95 | { \ |
96 | for (_i = 0; _i < 7-_skip; ++_i) \ |
97 | X##_f[_i] = X##_f[_i+_skip] >> _down \ |
98 | | X##_f[_i+_skip+1] << _up; \ |
99 | X##_f[_i++] = X##_f[7] >> _down; \ |
100 | } \ |
101 | for (; _i < 8; ++_i) \ |
102 | X##_f[_i] = 0; \ |
103 | /* don't fix the LSB until the very end when we're sure f[0] is stable */ \ |
104 | X##_f[0] |= (_s != 0); \ |
105 | } while (0) |
106 | |
107 | #endif |
108 |
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