diff options
Diffstat (limited to 'compat/bswap.h')
| -rw-r--r-- | compat/bswap.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/compat/bswap.h b/compat/bswap.h new file mode 100644 index 00000000..f0b7e93c --- /dev/null +++ b/compat/bswap.h @@ -0,0 +1,54 @@ +#ifndef _COMPAT_BSWAP_H_ +#define _COMPAT_BSWAP_H_ + +#if defined(__GNUC__) +#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 8)) +#define __HAS_BUILTIN_BSWAP16 +#endif +#if (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 4)) +#define __HAS_BUILTIN_BSWAP32 +#define __HAS_BUILTIN_BSWAP64 +#endif +#endif + +#if defined(__clang__) +#if (__clang_major__ > 3) || ((__clang_major__ == 3) && (__clang_minor__ >= 2)) +#define __HAS_BUILTIN_BSWAP16 +#endif +#if (__clang_major__ > 3) || ((__clang_major__ == 3) && (__clang_minor__ >= 0)) +#define __HAS_BUILTIN_BSWAP32 +#define __HAS_BUILTIN_BSWAP64 +#endif +#endif + +#ifdef __HAS_BUILTIN_BSWAP16 +#define bswap16(x) __builtin_bswap16(x) +#else +#include <stdint.h> +static inline uint16_t bswap16(uint16_t x) +{ + return x << 8 | x >> 8; +} +#endif + +#ifdef __HAS_BUILTIN_BSWAP32 +#define bswap32(x) __builtin_bswap32(x) +#else +#include <stdint.h> +static inline uint32_t bswap32(uint32_t x) +{ + return x >> 24 | (x >> 8 & 0xff00) | (x << 8 & 0xff0000) | x << 24; +} +#endif + +#ifdef __HAS_BUILTIN_BSWAP64 +#define bswap64(x) __builtin_bswap64(x) +#else +#include <stdint.h> +static inline uint64_t bswap64(uint64_t x) +{ + return ((uint64_t)bswap32(x)) << 32 | bswap32(x >> 32); +} +#endif + +#endif |