pg_crc32c_sse42_choose.c File Reference

#include "c.h"
#include "port/pg_crc32c.h"

Include dependency graph for pg_crc32c_sse42_choose.c:

Go to the source code of this file.

Functions
static bool	pg_crc32c_sse42_available (void)
static pg_crc32c	pg_comp_crc32c_choose (pg_crc32c crc, const void *data, size_t len)

Variables
pg_crc32c(*	pg_comp_crc32c )(pg_crc32c crc, const void *data, size_t len) = pg_comp_crc32c_choose

Function Documentation

pg_comp_crc32c_choose()

static pg_crc32c pg_comp_crc32c_choose ( pg_crc32c  crc, const void *  data, size_t  len  )

static

Definition at line 54 of file pg_crc32c_sse42_choose.c.

{
    if (pg_crc32c_sse42_available())
        pg_comp_crc32c = pg_comp_crc32c_sse42;
    else
        pg_comp_crc32c = pg_comp_crc32c_sb8;
 
    return pg_comp_crc32c(crc, data, len);
}

References crc, data, len, pg_comp_crc32c, pg_comp_crc32c_sb8(), and pg_crc32c_sse42_available().

pg_crc32c_sse42_available()

static bool pg_crc32c_sse42_available ( void  )

static

Definition at line 34 of file pg_crc32c_sse42_choose.c.

{
    unsigned int exx[4] = {0, 0, 0, 0};
 
#if defined(HAVE__GET_CPUID)
    __get_cpuid(1, &exx[0], &exx[1], &exx[2], &exx[3]);
#elif defined(HAVE__CPUID)
    __cpuid(exx, 1);
#else
#error cpuid instruction not available
#endif
 
    return (exx[2] & (1 << 20)) != 0;   /* SSE 4.2 */
}

Referenced by pg_comp_crc32c_choose().

Variable Documentation

pg_comp_crc32c

pg_crc32c(* pg_comp_crc32c) (pg_crc32c crc, const void *data, size_t len)	(	pg_crc32c	crc,
		const void *	data,
		size_t	len
	)		= pg_comp_crc32c_choose

Definition at line 64 of file pg_crc32c_sse42_choose.c.

Referenced by pg_comp_crc32c_choose().