1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
#if !defined(_mathops_H)
# define _mathops_H (1)
# include <ogg/ogg.h>
# if __GNUC_PREREQ(3,4)
# include <limits.h>
/*Note the casts to (int) below: this prevents OC_CLZ{32|64}_OFFS from
"upgrading" the type of an entire expression to an (unsigned) size_t.*/
# if INT_MAX>=2147483647
# define OC_CLZ32_OFFS ((int)sizeof(unsigned)*CHAR_BIT)
# define OC_CLZ32(_x) (__builtin_clz(_x))
# elif LONG_MAX>=2147483647L
# define OC_CLZ32_OFFS ((int)sizeof(unsigned long)*CHAR_BIT)
# define OC_CLZ32(_x) (__builtin_clzl(_x))
# endif
# if INT_MAX>=9223372036854775807LL
# define OC_CLZ64_OFFS ((int)sizeof(unsigned)*CHAR_BIT)
# define OC_CLZ64(_x) (__builtin_clz(_x))
# elif LONG_MAX>=9223372036854775807LL
# define OC_CLZ64_OFFS ((int)sizeof(unsigned long)*CHAR_BIT)
# define OC_CLZ64(_x) (__builtin_clzl(_x))
# elif LLONG_MAX>=9223372036854775807LL|| \
__LONG_LONG_MAX__>=9223372036854775807LL
# define OC_CLZ64_OFFS ((int)sizeof(unsigned long long)*CHAR_BIT)
# define OC_CLZ64(_x) (__builtin_clzll(_x))
# endif
# endif
/**
* oc_ilog32 - Integer binary logarithm of a 32-bit value.
* @_v: A 32-bit value.
* Returns floor(log2(_v))+1, or 0 if _v==0.
* This is the number of bits that would be required to represent _v in two's
* complement notation with all of the leading zeros stripped.
* The OC_ILOG_32() or OC_ILOGNZ_32() macros may be able to use a builtin
* function instead, which should be faster.
*/
int oc_ilog32(ogg_uint32_t _v);
/**
* oc_ilog64 - Integer binary logarithm of a 64-bit value.
* @_v: A 64-bit value.
* Returns floor(log2(_v))+1, or 0 if _v==0.
* This is the number of bits that would be required to represent _v in two's
* complement notation with all of the leading zeros stripped.
* The OC_ILOG_64() or OC_ILOGNZ_64() macros may be able to use a builtin
* function instead, which should be faster.
*/
int oc_ilog64(ogg_int64_t _v);
# if defined(OC_CLZ32)
/**
* OC_ILOGNZ_32 - Integer binary logarithm of a non-zero 32-bit value.
* @_v: A non-zero 32-bit value.
* Returns floor(log2(_v))+1.
* This is the number of bits that would be required to represent _v in two's
* complement notation with all of the leading zeros stripped.
* If _v is zero, the return value is undefined; use OC_ILOG_32() instead.
*/
# define OC_ILOGNZ_32(_v) (OC_CLZ32_OFFS-OC_CLZ32(_v))
/**
* OC_ILOG_32 - Integer binary logarithm of a 32-bit value.
* @_v: A 32-bit value.
* Returns floor(log2(_v))+1, or 0 if _v==0.
* This is the number of bits that would be required to represent _v in two's
* complement notation with all of the leading zeros stripped.
*/
# define OC_ILOG_32(_v) (OC_ILOGNZ_32(_v)&-!!(_v))
# else
# define OC_ILOGNZ_32(_v) (oc_ilog32(_v))
# define OC_ILOG_32(_v) (oc_ilog32(_v))
# endif
# if defined(CLZ64)
/**
* OC_ILOGNZ_64 - Integer binary logarithm of a non-zero 64-bit value.
* @_v: A non-zero 64-bit value.
* Returns floor(log2(_v))+1.
* This is the number of bits that would be required to represent _v in two's
* complement notation with all of the leading zeros stripped.
* If _v is zero, the return value is undefined; use OC_ILOG_64() instead.
*/
# define OC_ILOGNZ_64(_v) (CLZ64_OFFS-CLZ64(_v))
/**
* OC_ILOG_64 - Integer binary logarithm of a 64-bit value.
* @_v: A 64-bit value.
* Returns floor(log2(_v))+1, or 0 if _v==0.
* This is the number of bits that would be required to represent _v in two's
* complement notation with all of the leading zeros stripped.
*/
# define OC_ILOG_64(_v) (OC_ILOGNZ_64(_v)&-!!(_v))
# else
# define OC_ILOGNZ_64(_v) (oc_ilog64(_v))
# define OC_ILOG_64(_v) (oc_ilog64(_v))
# endif
# define OC_STATIC_ILOG0(_v) (!!(_v))
# define OC_STATIC_ILOG1(_v) (((_v)&0x2)?2:OC_STATIC_ILOG0(_v))
# define OC_STATIC_ILOG2(_v) \
(((_v)&0xC)?2+OC_STATIC_ILOG1((_v)>>2):OC_STATIC_ILOG1(_v))
# define OC_STATIC_ILOG3(_v) \
(((_v)&0xF0)?4+OC_STATIC_ILOG2((_v)>>4):OC_STATIC_ILOG2(_v))
# define OC_STATIC_ILOG4(_v) \
(((_v)&0xFF00)?8+OC_STATIC_ILOG3((_v)>>8):OC_STATIC_ILOG3(_v))
# define OC_STATIC_ILOG5(_v) \
(((_v)&0xFFFF0000)?16+OC_STATIC_ILOG4((_v)>>16):OC_STATIC_ILOG4(_v))
# define OC_STATIC_ILOG6(_v) \
(((_v)&0xFFFFFFFF00000000ULL)?32+OC_STATIC_ILOG5((_v)>>32):OC_STATIC_ILOG5(_v))
/**
* OC_STATIC_ILOG_32 - The integer logarithm of an (unsigned, 32-bit) constant.
* @_v: A non-negative 32-bit constant.
* Returns floor(log2(_v))+1, or 0 if _v==0.
* This is the number of bits that would be required to represent _v in two's
* complement notation with all of the leading zeros stripped.
* This macro is suitable for evaluation at compile time, but it should not be
* used on values that can change at runtime, as it operates via exhaustive
* search.
*/
# define OC_STATIC_ILOG_32(_v) (OC_STATIC_ILOG5((ogg_uint32_t)(_v)))
/**
* OC_STATIC_ILOG_64 - The integer logarithm of an (unsigned, 64-bit) constant.
* @_v: A non-negative 64-bit constant.
* Returns floor(log2(_v))+1, or 0 if _v==0.
* This is the number of bits that would be required to represent _v in two's
* complement notation with all of the leading zeros stripped.
* This macro is suitable for evaluation at compile time, but it should not be
* used on values that can change at runtime, as it operates via exhaustive
* search.
*/
# define OC_STATIC_ILOG_64(_v) (OC_STATIC_ILOG6((ogg_int64_t)(_v)))
#define OC_Q57(_v) ((ogg_int64_t)(_v)<<57)
#define OC_Q10(_v) ((_v)<<10)
ogg_int64_t oc_bexp64(ogg_int64_t _z);
ogg_int64_t oc_blog64(ogg_int64_t _w);
ogg_uint32_t oc_bexp32_q10(int _z);
int oc_blog32_q10(ogg_uint32_t _w);
#endif
|
