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pg_crc32c_loongarch.c File Reference
#include "c.h"
#include "port/pg_crc32c.h"
Include dependency graph for pg_crc32c_loongarch.c:

Go to the source code of this file.

Functions

pg_crc32c pg_comp_crc32c_loongarch (pg_crc32c crc, const void *data, size_t len)
 

Function Documentation

◆ pg_comp_crc32c_loongarch()

pg_crc32c pg_comp_crc32c_loongarch ( pg_crc32c  crc,
const void data,
size_t  len 
)

Definition at line 20 of file pg_crc32c_loongarch.c.

21{
22 const unsigned char *p = data;
23 const unsigned char *pend = p + len;
24
25 /*
26 * LoongArch doesn't require alignment, but aligned memory access is
27 * significantly faster. Process leading bytes so that the loop below
28 * starts with a pointer aligned to eight bytes.
29 */
30 if (!PointerIsAligned(p, uint16) &&
31 p + 1 <= pend)
32 {
34 p += 1;
35 }
36 if (!PointerIsAligned(p, uint32) &&
37 p + 2 <= pend)
38 {
40 p += 2;
41 }
42 if (!PointerIsAligned(p, uint64) &&
43 p + 4 <= pend)
44 {
46 p += 4;
47 }
48
49 /* Process eight bytes at a time, as far as we can. */
50 while (p + 8 <= pend)
51 {
53 p += 8;
54 }
55
56 /* Process remaining 0-7 bytes. */
57 if (p + 4 <= pend)
58 {
60 p += 4;
61 }
62 if (p + 2 <= pend)
63 {
65 p += 2;
66 }
67 if (p < pend)
68 {
70 }
71
72 return crc;
73}
#define PointerIsAligned(pointer, type)
Definition c.h:782
uint64_t uint64
Definition c.h:547
uint16_t uint16
Definition c.h:545
uint32_t uint32
Definition c.h:546
const void size_t len
const void * data
return crc
const unsigned char * pend
static int fb(int x)

References crc, data, fb(), len, pend, and PointerIsAligned.