xref: /openbmc/linux/include/math-emu/single.h (revision 1da177e4)
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__ */
117