diff options
Diffstat (limited to 'lib/byteswap.in.h')
| -rw-r--r-- | lib/byteswap.in.h | 59 |
1 files changed, 7 insertions, 52 deletions
diff --git a/lib/byteswap.in.h b/lib/byteswap.in.h index b2b26af8b03..02433d30da4 100644 --- a/lib/byteswap.in.h +++ b/lib/byteswap.in.h @@ -23,13 +23,14 @@ #error "Please include config.h first." #endif -/* Define this now, rather than after including stdint.h, in case - stdint.h recursively includes us. This is for Gnulib endian.h. */ +/* Define this now, rather than after including stdbit.h, in case stdbit.h + recursively includes us via stdint.h. This is for Gnulib endian.h. */ #ifndef _GL_BYTESWAP_INLINE # define _GL_BYTESWAP_INLINE _GL_INLINE #endif -#include <stdint.h> +#include <stdbit.h> /* for stdc_memreverse8u* */ +#include <stdint.h> /* for UINT_LEAST64_MAX */ _GL_INLINE_HEADER_BEGIN @@ -37,38 +38,12 @@ _GL_INLINE_HEADER_BEGIN extern "C" { #endif -#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8) -# define _GL_BYTESWAP_HAS_BUILTIN_BSWAP16 true -#elif defined __has_builtin -# if __has_builtin (__builtin_bswap16) -# define _GL_BYTESWAP_HAS_BUILTIN_BSWAP16 true -# endif -#endif - -#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) -# define _GL_BYTESWAP_HAS_BUILTIN_BSWAP32 true -# define _GL_BYTESWAP_HAS_BUILTIN_BSWAP64 true -#elif defined __has_builtin -# if __has_builtin (__builtin_bswap32) -# define _GL_BYTESWAP_HAS_BUILTIN_BSWAP32 true -# endif -# if __has_builtin (__builtin_bswap64) -# define _GL_BYTESWAP_HAS_BUILTIN_BSWAP64 true -# endif -#endif - /* Given an unsigned 16-bit argument X, return the value corresponding to X with reversed byte order. */ _GL_BYTESWAP_INLINE uint_least16_t bswap_16 (uint_least16_t x) { -#ifdef _GL_BYTESWAP_HAS_BUILTIN_BSWAP16 - return __builtin_bswap16 (x); -#else - uint_fast16_t mask = 0xff; - return ( (x & mask << 8 * 1) >> 8 * 1 - | (x & mask << 8 * 0) << 8 * 1); -#endif + return stdc_memreverse8u16 (x); } /* Given an unsigned 32-bit argument X, return the value corresponding to @@ -76,15 +51,7 @@ bswap_16 (uint_least16_t x) _GL_BYTESWAP_INLINE uint_least32_t bswap_32 (uint_least32_t x) { -#ifdef _GL_BYTESWAP_HAS_BUILTIN_BSWAP32 - return __builtin_bswap32 (x); -#else - uint_fast32_t mask = 0xff; - return ( (x & mask << 8 * 3) >> 8 * 3 - | (x & mask << 8 * 2) >> 8 * 1 - | (x & mask << 8 * 1) << 8 * 1 - | (x & mask << 8 * 0) << 8 * 3); -#endif + return stdc_memreverse8u32 (x); } #ifdef UINT_LEAST64_MAX @@ -93,19 +60,7 @@ bswap_32 (uint_least32_t x) _GL_BYTESWAP_INLINE uint_least64_t bswap_64 (uint_least64_t x) { -# ifdef _GL_BYTESWAP_HAS_BUILTIN_BSWAP64 - return __builtin_bswap64 (x); -# else - uint_fast64_t mask = 0xff; - return ( (x & mask << 8 * 7) >> 8 * 7 - | (x & mask << 8 * 6) >> 8 * 5 - | (x & mask << 8 * 5) >> 8 * 3 - | (x & mask << 8 * 4) >> 8 * 1 - | (x & mask << 8 * 3) << 8 * 1 - | (x & mask << 8 * 2) << 8 * 3 - | (x & mask << 8 * 1) << 8 * 5 - | (x & mask << 8 * 0) << 8 * 7); -# endif + return stdc_memreverse8u64 (x); } #endif |