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1da177e4 » Linus Torvalds
2005-04-16 Linux-2.6.12-rc2
1 /* Software floating-point emulation.
2 Definitions for IEEE Single Precision.
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),
7 David S. Miller (davem@redhat.com) and
8 Peter Maydell (pmaydell@chiark.greenend.org.uk).
9
10 The GNU C Library is free software; you can redistribute it and/or
11 modify it under the terms of the GNU Library General Public License as
12 published by the Free Software Foundation; either version 2 of the
13 License, or (at your option) any later version.
14
15 The GNU C Library is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Library General Public License for more details.
19
20 You should have received a copy of the GNU Library General Public
21 License along with the GNU C Library; see the file COPYING.LIB. If
22 not, write to the Free Software Foundation, Inc.,
23 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
24
25 #ifndef __MATH_EMU_SINGLE_H__
26 #define __MATH_EMU_SINGLE_H__
27
28 #if _FP_W_TYPE_SIZE < 32
29 #error "Here's a nickel kid. Go buy yourself a real computer."
30 #endif
31
32 #define _FP_FRACBITS_S 24
33 #define _FP_FRACXBITS_S (_FP_W_TYPE_SIZE - _FP_FRACBITS_S)
34 #define _FP_WFRACBITS_S (_FP_WORKBITS + _FP_FRACBITS_S)
35 #define _FP_WFRACXBITS_S (_FP_W_TYPE_SIZE - _FP_WFRACBITS_S)
36 #define _FP_EXPBITS_S 8
37 #define _FP_EXPBIAS_S 127
38 #define _FP_EXPMAX_S 255
39 #define _FP_QNANBIT_S ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-2))
40 #define _FP_IMPLBIT_S ((_FP_W_TYPE)1 << (_FP_FRACBITS_S-1))
41 #define _FP_OVERFLOW_S ((_FP_W_TYPE)1 << (_FP_WFRACBITS_S))
42
43 /* The implementation of _FP_MUL_MEAT_S and _FP_DIV_MEAT_S should be
44 chosen by the target machine. */
45
46 union _FP_UNION_S
47 {
48 float flt;
49 struct {
50 #if __BYTE_ORDER == __BIG_ENDIAN
51 unsigned sign : 1;
52 unsigned exp : _FP_EXPBITS_S;
53 unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
54 #else
55 unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
56 unsigned exp : _FP_EXPBITS_S;
57 unsigned sign : 1;
58 #endif
59 } bits __attribute__((packed));
60 };
61
62 #define FP_DECL_S(X) _FP_DECL(1,X)
63 #define FP_UNPACK_RAW_S(X,val) _FP_UNPACK_RAW_1(S,X,val)
64 #define FP_UNPACK_RAW_SP(X,val) _FP_UNPACK_RAW_1_P(S,X,val)
65 #define FP_PACK_RAW_S(val,X) _FP_PACK_RAW_1(S,val,X)
66 #define FP_PACK_RAW_SP(val,X) \
67 do { \
68 if (!FP_INHIBIT_RESULTS) \
69 _FP_PACK_RAW_1_P(S,val,X); \
70 } while (0)
71
72 #define FP_UNPACK_S(X,val) \
73 do { \
74 _FP_UNPACK_RAW_1(S,X,val); \
75 _FP_UNPACK_CANONICAL(S,1,X); \
76 } while (0)
77
78 #define FP_UNPACK_SP(X,val) \
79 do { \
80 _FP_UNPACK_RAW_1_P(S,X,val); \
81 _FP_UNPACK_CANONICAL(S,1,X); \
82 } while (0)
83
84 #define FP_PACK_S(val,X) \
85 do { \
86 _FP_PACK_CANONICAL(S,1,X); \
87 _FP_PACK_RAW_1(S,val,X); \
88 } while (0)
89
90 #define FP_PACK_SP(val,X) \
91 do { \
92 _FP_PACK_CANONICAL(S,1,X); \
93 if (!FP_INHIBIT_RESULTS) \
94 _FP_PACK_RAW_1_P(S,val,X); \
95 } while (0)
96
97 #define FP_ISSIGNAN_S(X) _FP_ISSIGNAN(S,1,X)
98 #define FP_NEG_S(R,X) _FP_NEG(S,1,R,X)
99 #define FP_ADD_S(R,X,Y) _FP_ADD(S,1,R,X,Y)
100 #define FP_SUB_S(R,X,Y) _FP_SUB(S,1,R,X,Y)
101 #define FP_MUL_S(R,X,Y) _FP_MUL(S,1,R,X,Y)
102 #define FP_DIV_S(R,X,Y) _FP_DIV(S,1,R,X,Y)
103 #define FP_SQRT_S(R,X) _FP_SQRT(S,1,R,X)
104 #define _FP_SQRT_MEAT_S(R,S,T,X,Q) _FP_SQRT_MEAT_1(R,S,T,X,Q)
105
106 #define FP_CMP_S(r,X,Y,un) _FP_CMP(S,1,r,X,Y,un)
107 #define FP_CMP_EQ_S(r,X,Y) _FP_CMP_EQ(S,1,r,X,Y)
108
109 #define FP_TO_INT_S(r,X,rsz,rsg) _FP_TO_INT(S,1,r,X,rsz,rsg)
110 #define FP_TO_INT_ROUND_S(r,X,rsz,rsg) _FP_TO_INT_ROUND(S,1,r,X,rsz,rsg)
111 #define FP_FROM_INT_S(X,r,rs,rt) _FP_FROM_INT(S,1,X,r,rs,rt)
112
113 #define _FP_FRAC_HIGH_S(X) _FP_FRAC_HIGH_1(X)
114 #define _FP_FRAC_HIGH_RAW_S(X) _FP_FRAC_HIGH_1(X)
115
116 #endif /* __MATH_EMU_SINGLE_H__ */
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