diff options
| -rw-r--r-- | include/misc.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/include/misc.h b/include/misc.h index cfe734f61..b34059161 100644 --- a/include/misc.h +++ b/include/misc.h @@ -270,6 +270,11 @@ void __attribute__((error("wrong sized variable passed to swap"))) wrong_size(vo static inline void wrong_size(void) { } + +static inline void __builtin_constant_p(int x) +{ + return 0; +} #endif /* byte swap a 32-bit value */ @@ -286,7 +291,10 @@ static inline void swap_uint32(uint32_t *x) #define swapl(x) do { \ if (sizeof(*(x)) != 4) \ wrong_size(); \ - swap_uint32((uint32_t *)(x)); \ + if (__builtin_constant_p((uintptr_t)(x) & 3) && ((uintptr_t)(x) & 3) == 0) \ + *(x) = lswapl(*(x)); \ + else \ + swap_uint32((uint32_t *)(x)); \ } while (0) /* byte swap a 16-bit value */ @@ -300,7 +308,10 @@ static inline void swap_uint16(uint16_t *x) #define swaps(x) do { \ if (sizeof(*(x)) != 2) \ wrong_size(); \ - swap_uint16((uint16_t *)(x)); \ + if (__builtin_constant_p((uintptr_t)(x) & 1) && ((uintptr_t)(x) & 1) == 0) \ + *(x) = lswaps(*(x)); \ + else \ + swap_uint16((uint16_t *)(x)); \ } while (0) /* copy 32-bit value from src to dst byteswapping on the way */ |