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Functions | Variables
pg_bitutils.c File Reference
#include "c.h"
#include "port/pg_bitutils.h"
Include dependency graph for pg_bitutils.c:

Go to the source code of this file.

Functions

uint64 pg_popcount_portable (const char *buf, int bytes)
 
uint64 pg_popcount_masked_portable (const char *buf, int bytes, bits8 mask)
 
uint64 pg_popcount_optimized (const char *buf, int bytes)
 
uint64 pg_popcount_masked_optimized (const char *buf, int bytes, bits8 mask)
 

Variables

const uint8 pg_leftmost_one_pos [256]
 
const uint8 pg_rightmost_one_pos [256]
 
const uint8 pg_number_of_ones [256]
 

Function Documentation

◆ pg_popcount_masked_optimized()

uint64 pg_popcount_masked_optimized ( const char *  buf,
int  bytes,
bits8  mask 
)

Definition at line 189 of file pg_bitutils.c.

190{
191 return pg_popcount_masked_portable(buf, bytes, mask);
192}
pg_popcount_masked_portable
uint64 pg_popcount_masked_portable(const char *buf, int bytes, bits8 mask)
Definition pg_bitutils.c:136
buf
static char buf[DEFAULT_XLOG_SEG_SIZE]
Definition pg_test_fsync.c:71

References buf, and pg_popcount_masked_portable().

Referenced by pg_popcount_masked().

◆ pg_popcount_masked_portable()

uint64 pg_popcount_masked_portable ( const char *  buf,
int  bytes,
bits8  mask 
)

Definition at line 136 of file pg_bitutils.c.

137{
138 uint64 popcnt = 0;
139
140#if SIZEOF_VOID_P >= 8
141 /* Process in 64-bit chunks if the buffer is aligned */
142 uint64 maskv = ~UINT64CONST(0) / 0xFF * mask;
143
144 if (buf == (const char *) TYPEALIGN(8, buf))
145 {
146 const uint64 *words = (const uint64 *) buf;
147
148 while (bytes >= 8)
149 {
150 popcnt += pg_popcount64(*words++ & maskv);
151 bytes -= 8;
152 }
153
154 buf = (const char *) words;
155 }
156#endif
157
158 /* Process any remaining bytes */
159 while (bytes--)
160 popcnt += pg_number_of_ones[(unsigned char) *buf++ & mask];
161
162 return popcnt;
163}
TYPEALIGN
#define TYPEALIGN(ALIGNVAL, LEN)
Definition c.h:831
uint64
uint64_t uint64
Definition c.h:559
pg_number_of_ones
const uint8 pg_number_of_ones[256]
Definition pg_bitutils.c:80
pg_popcount64
static int pg_popcount64(uint64 word)
Definition pg_bitutils.h:328
fb
static int fb(int x)
Definition preproc-init.c:92

References buf, fb(), pg_number_of_ones, pg_popcount64(), and TYPEALIGN.

Referenced by pg_popcount_masked_optimized().

◆ pg_popcount_optimized()

uint64 pg_popcount_optimized ( const char *  buf,
int  bytes 
)

Definition at line 179 of file pg_bitutils.c.

180{
181 return pg_popcount_portable(buf, bytes);
182}
pg_popcount_portable
uint64 pg_popcount_portable(const char *buf, int bytes)
Definition pg_bitutils.c:104

References buf, and pg_popcount_portable().

Referenced by pg_popcount().

◆ pg_popcount_portable()

uint64 pg_popcount_portable ( const char *  buf,
int  bytes 
)

Definition at line 104 of file pg_bitutils.c.

105{
106 uint64 popcnt = 0;
107
108#if SIZEOF_VOID_P >= 8
109 /* Process in 64-bit chunks if the buffer is aligned. */
110 if (buf == (const char *) TYPEALIGN(8, buf))
111 {
112 const uint64 *words = (const uint64 *) buf;
113
114 while (bytes >= 8)
115 {
116 popcnt += pg_popcount64(*words++);
117 bytes -= 8;
118 }
119
120 buf = (const char *) words;
121 }
122#endif
123
124 /* Process any remaining bytes */
125 while (bytes--)
126 popcnt += pg_number_of_ones[(unsigned char) *buf++];
127
128 return popcnt;
129}

References buf, fb(), pg_number_of_ones, pg_popcount64(), and TYPEALIGN.

Referenced by pg_popcount_optimized().

Variable Documentation

◆ pg_leftmost_one_pos

const uint8 pg_leftmost_one_pos[256]
Initial value:
= {
0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
}

Definition at line 27 of file pg_bitutils.c.

27 {
28 0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
29 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
30 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
31 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
32 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
33 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
34 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
35 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
36 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
37 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
38 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
39 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
40 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
41 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
42 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
43 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
44};

Referenced by AllocSetFreeIndex(), pg_leftmost_one_pos32(), and pg_leftmost_one_pos64().

◆ pg_number_of_ones

const uint8 pg_number_of_ones[256]
Initial value:
= {
0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
}

Definition at line 80 of file pg_bitutils.c.

80 {
81 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
82 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
83 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
84 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
85 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
86 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
87 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
88 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
89 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
90 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
91 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
92 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
93 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
94 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
95 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
96 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
97};

Referenced by hemdistsign(), hemdistsign(), hemdistsign(), hemdistsign(), pg_popcount(), pg_popcount_masked(), pg_popcount_masked_portable(), pg_popcount_portable(), and process_pipe_input().

◆ pg_rightmost_one_pos

const uint8 pg_rightmost_one_pos[256]
Initial value:
= {
0, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0
}

Definition at line 55 of file pg_bitutils.c.

55 {
56 0, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
57 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
58 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
59 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
60 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
61 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
62 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
63 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
64 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
65 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
66 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
67 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
68 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
69 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
70 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0,
71 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0
72};

Referenced by pg_rightmost_one_pos32(), and pg_rightmost_one_pos64().