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/*------------------------------------------------------------------------- * * pg_bswap.h * Byte swapping. * * Macros for reversing the byte order of 32-bit and 64-bit unsigned integers. * For example, 0xAABBCCDD becomes 0xDDCCBBAA. These are just wrappers for * built-in functions provided by the compiler where support exists. * Elsewhere, beware of multiple evaluations of the arguments! * * Note that the GCC built-in functions __builtin_bswap32() and * __builtin_bswap64() are documented as accepting single arguments of type * uint32_t and uint64_t respectively (these are also the respective return * types). Use caution when using these wrapper macros with signed integers. * * Copyright (c) 2015-2016, PostgreSQL Global Development Group * * src/include/port/pg_bswap.h * *------------------------------------------------------------------------- */ #ifndef PG_BSWAP_H #define PG_BSWAP_H #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 /* HAVE__BUILTIN_BSWAP32 */ #ifdef HAVE__BUILTIN_BSWAP64 #define BSWAP64(x) __builtin_bswap64(x) #else #define BSWAP64(x) ((((x) << 56) & UINT64CONST(0xff00000000000000)) | \ (((x) << 40) & UINT64CONST(0x00ff000000000000)) | \ (((x) << 24) & UINT64CONST(0x0000ff0000000000)) | \ (((x) << 8) & UINT64CONST(0x000000ff00000000)) | \ (((x) >> 8) & UINT64CONST(0x00000000ff000000)) | \ (((x) >> 24) & UINT64CONST(0x0000000000ff0000)) | \ (((x) >> 40) & UINT64CONST(0x000000000000ff00)) | \ (((x) >> 56) & UINT64CONST(0x00000000000000ff))) #endif /* HAVE__BUILTIN_BSWAP64 */ /* * Rearrange the bytes of a Datum from big-endian order into the native byte * order. On big-endian machines, this does nothing at all. Note that the C * type Datum is an unsigned integer type on all platforms. * * One possible application of the DatumBigEndianToNative() macro is to make * bitwise comparisons cheaper. A simple 3-way comparison of Datums * transformed by the macro (based on native, unsigned comparisons) will return * the same result as a memcmp() of the corresponding original Datums, but can * be much cheaper. It's generally safe to do this on big-endian systems * without any special transformation occurring first. */ #ifdef WORDS_BIGENDIAN #define DatumBigEndianToNative(x) (x) #else /* !WORDS_BIGENDIAN */ #if SIZEOF_DATUM == 8 #define DatumBigEndianToNative(x) BSWAP64(x) #else /* SIZEOF_DATUM != 8 */ #define DatumBigEndianToNative(x) BSWAP32(x) #endif /* SIZEOF_DATUM == 8 */ #endif /* WORDS_BIGENDIAN */ #endif /* PG_BSWAP_H */