diff options
Diffstat (limited to 'third_party/git/compat/bswap.h')
| -rw-r--r-- | third_party/git/compat/bswap.h | 217 |
1 files changed, 0 insertions, 217 deletions
diff --git a/third_party/git/compat/bswap.h b/third_party/git/compat/bswap.h deleted file mode 100644 index e4e25735ce..0000000000 --- a/third_party/git/compat/bswap.h +++ /dev/null @@ -1,217 +0,0 @@ -#ifndef COMPAT_BSWAP_H -#define COMPAT_BSWAP_H - -/* - * Let's make sure we always have a sane definition for ntohl()/htonl(). - * Some libraries define those as a function call, just to perform byte - * shifting, bringing significant overhead to what should be a simple - * operation. - */ - -/* - * Default version that the compiler ought to optimize properly with - * constant values. - */ -static inline uint32_t default_swab32(uint32_t val) -{ - return (((val & 0xff000000) >> 24) | - ((val & 0x00ff0000) >> 8) | - ((val & 0x0000ff00) << 8) | - ((val & 0x000000ff) << 24)); -} - -static inline uint64_t default_bswap64(uint64_t val) -{ - return (((val & (uint64_t)0x00000000000000ffULL) << 56) | - ((val & (uint64_t)0x000000000000ff00ULL) << 40) | - ((val & (uint64_t)0x0000000000ff0000ULL) << 24) | - ((val & (uint64_t)0x00000000ff000000ULL) << 8) | - ((val & (uint64_t)0x000000ff00000000ULL) >> 8) | - ((val & (uint64_t)0x0000ff0000000000ULL) >> 24) | - ((val & (uint64_t)0x00ff000000000000ULL) >> 40) | - ((val & (uint64_t)0xff00000000000000ULL) >> 56)); -} - -#undef bswap32 -#undef bswap64 - -#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) - -#define bswap32 git_bswap32 -static inline uint32_t git_bswap32(uint32_t x) -{ - uint32_t result; - if (__builtin_constant_p(x)) - result = default_swab32(x); - else - __asm__("bswap %0" : "=r" (result) : "0" (x)); - return result; -} - -#define bswap64 git_bswap64 -#if defined(__x86_64__) -static inline uint64_t git_bswap64(uint64_t x) -{ - uint64_t result; - if (__builtin_constant_p(x)) - result = default_bswap64(x); - else - __asm__("bswap %q0" : "=r" (result) : "0" (x)); - return result; -} -#else -static inline uint64_t git_bswap64(uint64_t x) -{ - union { uint64_t i64; uint32_t i32[2]; } tmp, result; - if (__builtin_constant_p(x)) - result.i64 = default_bswap64(x); - else { - tmp.i64 = x; - result.i32[0] = git_bswap32(tmp.i32[1]); - result.i32[1] = git_bswap32(tmp.i32[0]); - } - return result.i64; -} -#endif - -#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64)) - -#include <stdlib.h> - -#define bswap32(x) _byteswap_ulong(x) -#define bswap64(x) _byteswap_uint64(x) - -#endif - -#if defined(bswap32) - -#undef ntohl -#undef htonl -#define ntohl(x) bswap32(x) -#define htonl(x) bswap32(x) - -#endif - -#if defined(bswap64) - -#undef ntohll -#undef htonll -#define ntohll(x) bswap64(x) -#define htonll(x) bswap64(x) - -#else - -#undef ntohll -#undef htonll - -#if defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && defined(__BIG_ENDIAN) - -# define GIT_BYTE_ORDER __BYTE_ORDER -# define GIT_LITTLE_ENDIAN __LITTLE_ENDIAN -# define GIT_BIG_ENDIAN __BIG_ENDIAN - -#elif defined(BYTE_ORDER) && defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN) - -# define GIT_BYTE_ORDER BYTE_ORDER -# define GIT_LITTLE_ENDIAN LITTLE_ENDIAN -# define GIT_BIG_ENDIAN BIG_ENDIAN - -#else - -# define GIT_BIG_ENDIAN 4321 -# define GIT_LITTLE_ENDIAN 1234 - -# if defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN) -# define GIT_BYTE_ORDER GIT_BIG_ENDIAN -# elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN) -# define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN -# elif defined(__THW_BIG_ENDIAN__) && !defined(__THW_LITTLE_ENDIAN__) -# define GIT_BYTE_ORDER GIT_BIG_ENDIAN -# elif defined(__THW_LITTLE_ENDIAN__) && !defined(__THW_BIG_ENDIAN__) -# define GIT_BYTE_ORDER GIT_LITTLE_ENDIAN -# else -# error "Cannot determine endianness" -# endif - -#endif - -#if GIT_BYTE_ORDER == GIT_BIG_ENDIAN -# define ntohll(n) (n) -# define htonll(n) (n) -#else -# define ntohll(n) default_bswap64(n) -# define htonll(n) default_bswap64(n) -#endif - -#endif - -/* - * Performance might be improved if the CPU architecture is OK with - * unaligned 32-bit loads and a fast ntohl() is available. - * Otherwise fall back to byte loads and shifts which is portable, - * and is faster on architectures with memory alignment issues. - */ - -#if !defined(NO_UNALIGNED_LOADS) && ( \ - defined(__i386__) || defined(__x86_64__) || \ - defined(_M_IX86) || defined(_M_X64) || \ - defined(__ppc__) || defined(__ppc64__) || \ - defined(__powerpc__) || defined(__powerpc64__) || \ - defined(__s390__) || defined(__s390x__)) - -#define get_be16(p) ntohs(*(unsigned short *)(p)) -#define get_be32(p) ntohl(*(unsigned int *)(p)) -#define get_be64(p) ntohll(*(uint64_t *)(p)) -#define put_be32(p, v) do { *(unsigned int *)(p) = htonl(v); } while (0) -#define put_be64(p, v) do { *(uint64_t *)(p) = htonll(v); } while (0) - -#else - -static inline uint16_t get_be16(const void *ptr) -{ - const unsigned char *p = ptr; - return (uint16_t)p[0] << 8 | - (uint16_t)p[1] << 0; -} - -static inline uint32_t get_be32(const void *ptr) -{ - const unsigned char *p = ptr; - return (uint32_t)p[0] << 24 | - (uint32_t)p[1] << 16 | - (uint32_t)p[2] << 8 | - (uint32_t)p[3] << 0; -} - -static inline uint64_t get_be64(const void *ptr) -{ - const unsigned char *p = ptr; - return (uint64_t)get_be32(&p[0]) << 32 | - (uint64_t)get_be32(&p[4]) << 0; -} - -static inline void put_be32(void *ptr, uint32_t value) -{ - unsigned char *p = ptr; - p[0] = value >> 24; - p[1] = value >> 16; - p[2] = value >> 8; - p[3] = value >> 0; -} - -static inline void put_be64(void *ptr, uint64_t value) -{ - unsigned char *p = ptr; - p[0] = value >> 56; - p[1] = value >> 48; - p[2] = value >> 40; - p[3] = value >> 32; - p[4] = value >> 24; - p[5] = value >> 16; - p[6] = value >> 8; - p[7] = value >> 0; -} - -#endif - -#endif /* COMPAT_BSWAP_H */ |