File: /usr/src/linux/arch/ppc/math-emu/single.h

1     /*
2      * BK Id: SCCS/s.single.h 1.5 05/17/01 18:14:23 cort
3      */
4     /*
5      * Definitions for IEEE Single Precision
6      */
7     
8     #if _FP_W_TYPE_SIZE < 32
9     #error "Here's a nickel kid.  Go buy yourself a real computer."
10     #endif
11     
12     #define _FP_FRACBITS_S		24
13     #define _FP_FRACXBITS_S		(_FP_W_TYPE_SIZE - _FP_FRACBITS_S)
14     #define _FP_WFRACBITS_S		(_FP_WORKBITS + _FP_FRACBITS_S)
15     #define _FP_WFRACXBITS_S	(_FP_W_TYPE_SIZE - _FP_WFRACBITS_S)
16     #define _FP_EXPBITS_S		8
17     #define _FP_EXPBIAS_S		127
18     #define _FP_EXPMAX_S		255
19     #define _FP_QNANBIT_S		((_FP_W_TYPE)1 << (_FP_FRACBITS_S-2))
20     #define _FP_IMPLBIT_S		((_FP_W_TYPE)1 << (_FP_FRACBITS_S-1))
21     #define _FP_OVERFLOW_S		((_FP_W_TYPE)1 << (_FP_WFRACBITS_S))
22     
23     /* The implementation of _FP_MUL_MEAT_S and _FP_DIV_MEAT_S should be
24        chosen by the target machine.  */
25     
26     union _FP_UNION_S
27     {
28       float flt;
29       struct {
30     #if __BYTE_ORDER == __BIG_ENDIAN
31         unsigned sign : 1;
32         unsigned exp  : _FP_EXPBITS_S;
33         unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
34     #else
35         unsigned frac : _FP_FRACBITS_S - (_FP_IMPLBIT_S != 0);
36         unsigned exp  : _FP_EXPBITS_S;
37         unsigned sign : 1;
38     #endif
39       } bits __attribute__((packed));
40     };
41     
42     #define FP_DECL_S(X)		_FP_DECL(1,X)
43     #define FP_UNPACK_RAW_S(X,val)	_FP_UNPACK_RAW_1(S,X,val)
44     #define FP_PACK_RAW_S(val,X)	_FP_PACK_RAW_1(S,val,X)
45     
46     #define FP_UNPACK_S(X,val)		\
47       do {					\
48         _FP_UNPACK_RAW_1(S,X,val);		\
49         _FP_UNPACK_CANONICAL(S,1,X);	\
50       } while (0)
51     
52     #define FP_PACK_S(val,X)		\
53       do {					\
54         _FP_PACK_CANONICAL(S,1,X);		\
55         _FP_PACK_RAW_1(S,val,X);		\
56       } while (0)
57     
58     #define FP_NEG_S(R,X)		_FP_NEG(S,1,R,X)
59     #define FP_ADD_S(R,X,Y)		_FP_ADD(S,1,R,X,Y)
60     #define FP_SUB_S(R,X,Y)		_FP_SUB(S,1,R,X,Y)
61     #define FP_MUL_S(R,X,Y)		_FP_MUL(S,1,R,X,Y)
62     #define FP_DIV_S(R,X,Y)		_FP_DIV(S,1,R,X,Y)
63     #define FP_SQRT_S(R,X)		_FP_SQRT(S,1,R,X)
64     
65     #define FP_CMP_S(r,X,Y,un)	_FP_CMP(S,1,r,X,Y,un)
66     #define FP_CMP_EQ_S(r,X,Y)	_FP_CMP_EQ(S,1,r,X,Y)
67     
68     #define FP_TO_INT_S(r,X,rsz,rsg)  _FP_TO_INT(S,1,r,X,rsz,rsg)
69     #define FP_FROM_INT_S(X,r,rs,rt)  _FP_FROM_INT(S,1,X,r,rs,rt)
70