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Add BSWAP64 macro.

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This is like BSWAP32, but for 64-bit values.  Since we've got two of
them now and they have use cases (like sortsupport) beyond CRCs, move
the definitions to their own header file.

Peter Geoghegan
This commit is contained in:
Robert Haas
2015-10-08 13:01:36 -04:00
parent 1e35319861
commit c171818b27
7 changed files with 97 additions and 10 deletions
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12
src/include/port/pg_crc32c.h
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@ -33,6 +33,8 @@
#ifndef PG_CRC32C_H
#define PG_CRC32C_H
#include "port/pg_bswap.h"
typedef uint32 pg_crc32c;
/* The INIT and EQ macros are the same for all implementations. */
@ -71,16 +73,6 @@ extern pg_crc32c (*pg_comp_crc32c) (pg_crc32c crc, const void *data, size_t len)
#define COMP_CRC32C(crc, data, len) \
((crc) = pg_comp_crc32c_sb8((crc), (data), (len)))
#ifdef WORDS_BIGENDIAN
#ifdef HAVE__BUILTIN_BSWAP32
#define BSWAP32(x) __builtin_bswap32(x)
#else
#define BSWAP32(x) (((x << 24) & 0xff000000) | \
((x << 8) & 0x00ff0000) | \
((x >> 8) & 0x0000ff00) | \
((x >> 24) & 0x000000ff))
#endif
#define FIN_CRC32C(crc) ((crc) = BSWAP32(crc) ^ 0xFFFFFFFF)
#else
#define FIN_CRC32C(crc) ((crc) ^= 0xFFFFFFFF)