Mercurial > hg > CbC > CbC_gcc
comparison gcc/config/soft-fp/op-8.h @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
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1 /* Software floating-point emulation. | |
2 Basic eight-word fraction declaration and manipulation. | |
3 Copyright (C) 1997,1998,1999,2006 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 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. | |
13 | |
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 | |
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 | |
26 Lesser General Public License for more details. | |
27 | |
28 You should have received a copy of the GNU Lesser General Public | |
29 License along with the GNU C Library; if not, write to the Free | |
30 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, | |
31 MA 02110-1301, USA. */ | |
32 | |
33 /* We need just a few things from here for op-4, if we ever need some | |
34 other macros, they can be added. */ | |
35 #define _FP_FRAC_DECL_8(X) _FP_W_TYPE X##_f[8] | |
36 #define _FP_FRAC_HIGH_8(X) (X##_f[7]) | |
37 #define _FP_FRAC_LOW_8(X) (X##_f[0]) | |
38 #define _FP_FRAC_WORD_8(X,w) (X##_f[w]) | |
39 | |
40 #define _FP_FRAC_SLL_8(X,N) \ | |
41 do { \ | |
42 _FP_I_TYPE _up, _down, _skip, _i; \ | |
43 _skip = (N) / _FP_W_TYPE_SIZE; \ | |
44 _up = (N) % _FP_W_TYPE_SIZE; \ | |
45 _down = _FP_W_TYPE_SIZE - _up; \ | |
46 if (!_up) \ | |
47 for (_i = 7; _i >= _skip; --_i) \ | |
48 X##_f[_i] = X##_f[_i-_skip]; \ | |
49 else \ | |
50 { \ | |
51 for (_i = 7; _i > _skip; --_i) \ | |
52 X##_f[_i] = X##_f[_i-_skip] << _up \ | |
53 | X##_f[_i-_skip-1] >> _down; \ | |
54 X##_f[_i--] = X##_f[0] << _up; \ | |
55 } \ | |
56 for (; _i >= 0; --_i) \ | |
57 X##_f[_i] = 0; \ | |
58 } while (0) | |
59 | |
60 #define _FP_FRAC_SRL_8(X,N) \ | |
61 do { \ | |
62 _FP_I_TYPE _up, _down, _skip, _i; \ | |
63 _skip = (N) / _FP_W_TYPE_SIZE; \ | |
64 _down = (N) % _FP_W_TYPE_SIZE; \ | |
65 _up = _FP_W_TYPE_SIZE - _down; \ | |
66 if (!_down) \ | |
67 for (_i = 0; _i <= 7-_skip; ++_i) \ | |
68 X##_f[_i] = X##_f[_i+_skip]; \ | |
69 else \ | |
70 { \ | |
71 for (_i = 0; _i < 7-_skip; ++_i) \ | |
72 X##_f[_i] = X##_f[_i+_skip] >> _down \ | |
73 | X##_f[_i+_skip+1] << _up; \ | |
74 X##_f[_i++] = X##_f[7] >> _down; \ | |
75 } \ | |
76 for (; _i < 8; ++_i) \ | |
77 X##_f[_i] = 0; \ | |
78 } while (0) | |
79 | |
80 | |
81 /* Right shift with sticky-lsb. | |
82 * What this actually means is that we do a standard right-shift, | |
83 * but that if any of the bits that fall off the right hand side | |
84 * were one then we always set the LSbit. | |
85 */ | |
86 #define _FP_FRAC_SRS_8(X,N,size) \ | |
87 do { \ | |
88 _FP_I_TYPE _up, _down, _skip, _i; \ | |
89 _FP_W_TYPE _s; \ | |
90 _skip = (N) / _FP_W_TYPE_SIZE; \ | |
91 _down = (N) % _FP_W_TYPE_SIZE; \ | |
92 _up = _FP_W_TYPE_SIZE - _down; \ | |
93 for (_s = _i = 0; _i < _skip; ++_i) \ | |
94 _s |= X##_f[_i]; \ | |
95 if (!_down) \ | |
96 for (_i = 0; _i <= 7-_skip; ++_i) \ | |
97 X##_f[_i] = X##_f[_i+_skip]; \ | |
98 else \ | |
99 { \ | |
100 _s |= X##_f[_i] << _up; \ | |
101 for (_i = 0; _i < 7-_skip; ++_i) \ | |
102 X##_f[_i] = X##_f[_i+_skip] >> _down \ | |
103 | X##_f[_i+_skip+1] << _up; \ | |
104 X##_f[_i++] = X##_f[7] >> _down; \ | |
105 } \ | |
106 for (; _i < 8; ++_i) \ | |
107 X##_f[_i] = 0; \ | |
108 /* don't fix the LSB until the very end when we're sure f[0] is stable */ \ | |
109 X##_f[0] |= (_s != 0); \ | |
110 } while (0) | |
111 |