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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/*****************************************************************************
Copyright (c) 1994, 2009, Innobase Oy. All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
/**************************************************************//**
@file include/ut0ut.ic
Various utilities
Created 5/30/1994 Heikki Tuuri
*******************************************************************/
/******************************************************//**
Calculates the minimum of two ulints.
@return minimum */
UNIV_INLINE
ulint
ut_min(
/*===*/
ulint n1, /*!< in: first number */
ulint n2) /*!< in: second number */
{
return((n1 <= n2) ? n1 : n2);
}
/******************************************************//**
Calculates the maximum of two ulints.
@return maximum */
UNIV_INLINE
ulint
ut_max(
/*===*/
ulint n1, /*!< in: first number */
ulint n2) /*!< in: second number */
{
return((n1 <= n2) ? n2 : n1);
}
/******************************************************//**
Calculates the maximum of two ib_uint64_t values.
@return the maximum */
UNIV_INLINE
ib_uint64_t
ut_max_uint64(
/*==========*/
ib_uint64_t n1, /*!< in: first number */
ib_uint64_t n2) /*!< in: second number */
{
return((n1 <= n2) ? n2 : n1);
}
/****************************************************************//**
Calculates minimum of two ulint-pairs. */
UNIV_INLINE
void
ut_pair_min(
/*========*/
ulint* a, /*!< out: more significant part of minimum */
ulint* b, /*!< out: less significant part of minimum */
ulint a1, /*!< in: more significant part of first pair */
ulint b1, /*!< in: less significant part of first pair */
ulint a2, /*!< in: more significant part of second pair */
ulint b2) /*!< in: less significant part of second pair */
{
if (a1 == a2) {
*a = a1;
*b = ut_min(b1, b2);
} else if (a1 < a2) {
*a = a1;
*b = b1;
} else {
*a = a2;
*b = b2;
}
}
/******************************************************//**
Compares two ulints.
@return 1 if a > b, 0 if a == b, -1 if a < b */
UNIV_INLINE
int
ut_ulint_cmp(
/*=========*/
ulint a, /*!< in: ulint */
ulint b) /*!< in: ulint */
{
if (a < b) {
return(-1);
} else if (a == b) {
return(0);
} else {
return(1);
}
}
/*******************************************************//**
Compares two pairs of ulints.
@return -1 if a < b, 0 if a == b, 1 if a > b */
UNIV_INLINE
int
ut_pair_cmp(
/*========*/
ulint a1, /*!< in: more significant part of first pair */
ulint a2, /*!< in: less significant part of first pair */
ulint b1, /*!< in: more significant part of second pair */
ulint b2) /*!< in: less significant part of second pair */
{
if (a1 > b1) {
return(1);
} else if (a1 < b1) {
return(-1);
} else if (a2 > b2) {
return(1);
} else if (a2 < b2) {
return(-1);
} else {
return(0);
}
}
/*************************************************************//**
Calculates fast the 2-logarithm of a number, rounded upward to an
integer.
@return logarithm in the base 2, rounded upward */
UNIV_INLINE
ulint
ut_2_log(
/*=====*/
ulint n) /*!< in: number != 0 */
{
ulint res;
res = 0;
ut_ad(n > 0);
n = n - 1;
for (;;) {
n = n / 2;
if (n == 0) {
break;
}
res++;
}
return(res + 1);
}
/*************************************************************//**
Calculates 2 to power n.
@return 2 to power n */
UNIV_INLINE
ulint
ut_2_exp(
/*=====*/
ulint n) /*!< in: number */
{
return((ulint) 1 << n);
}
|
