diff options
| author | Dennis Ameling <dennis@dennisameling.com> | 2025-04-23 08:01:43 +0000 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2025-04-23 08:53:04 -0700 |
| commit | 6547d1c9cbafaa5f3e650ccdedd8809e88987011 (patch) | |
| tree | 749bd53f93ed2b16feca26614640b399250c8dc0 /compat | |
| parent | 683c54c999c301c2cd6f715c411407c413b1d84e (diff) | |
bswap.h: add support for built-in bswap functions
Newer compiler versions, like GCC 10 and Clang 12, have built-in
functions for bswap32 and bswap64. This comes in handy, for example,
when targeting CLANGARM64 on Windows, which would not be supported
without this logic.
Signed-off-by: Dennis Ameling <dennis@dennisameling.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'compat')
| -rw-r--r-- | compat/bswap.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/compat/bswap.h b/compat/bswap.h index b34054f2bd..9e0f98e00b 100644 --- a/compat/bswap.h +++ b/compat/bswap.h @@ -35,7 +35,19 @@ static inline uint64_t default_bswap64(uint64_t val) #undef bswap32 #undef bswap64 -#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) +/** + * __has_builtin is available since Clang 10 and GCC 10. + * Below is a fallback for older compilers. + */ +#ifndef __has_builtin + #define __has_builtin(x) 0 +#endif + +#if __has_builtin(__builtin_bswap32) && __has_builtin(__builtin_bswap64) +#define bswap32(x) __builtin_bswap32((x)) +#define bswap64(x) __builtin_bswap64((x)) + +#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) #define bswap32 git_bswap32 static inline uint32_t git_bswap32(uint32_t x) |