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bswap: Tidy base definitions of bswapN

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Move the bswap_N -> bswapN wrappers inside CONFIG_BYTESWAP_H.

Change the ultimate fallback defintions from macros to inline functions.
The proper types recieved by the function arguments means we can remove
unnecessary casts, making the code more readable.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Richard Henderson 2013-01-04 16:39:27 -08:00 committed by Blue Swirl
parent fedb88bd32
commit cdfe2851c6
1 changed files with 30 additions and 42 deletions
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64
include/qemu/bswap.h
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@ -10,45 +10,8 @@
# include <sys/endian.h> # include <sys/endian.h>
# include <sys/types.h> # include <sys/types.h>
# include <machine/bswap.h> # include <machine/bswap.h>
#else #elif defined(CONFIG_BYTESWAP_H)
#ifdef CONFIG_BYTESWAP_H
# include <byteswap.h> # include <byteswap.h>
#else
#define bswap_16(x) \
({ \
uint16_t __x = (x); \
((uint16_t)( \
(((uint16_t)(__x) & (uint16_t)0x00ffU) << 8) | \
(((uint16_t)(__x) & (uint16_t)0xff00U) >> 8) )); \
})
#define bswap_32(x) \
({ \
uint32_t __x = (x); \
((uint32_t)( \
(((uint32_t)(__x) & (uint32_t)0x000000ffUL) << 24) | \
(((uint32_t)(__x) & (uint32_t)0x0000ff00UL) << 8) | \
(((uint32_t)(__x) & (uint32_t)0x00ff0000UL) >> 8) | \
(((uint32_t)(__x) & (uint32_t)0xff000000UL) >> 24) )); \
})
#define bswap_64(x) \
({ \
uint64_t __x = (x); \
((uint64_t)( \
(uint64_t)(((uint64_t)(__x) & (uint64_t)0x00000000000000ffULL) << 56) | \
(uint64_t)(((uint64_t)(__x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
(uint64_t)(((uint64_t)(__x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
(uint64_t)(((uint64_t)(__x) & (uint64_t)0x00000000ff000000ULL) << 8) | \
(uint64_t)(((uint64_t)(__x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \
(uint64_t)(((uint64_t)(__x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
(uint64_t)(((uint64_t)(__x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
(uint64_t)(((uint64_t)(__x) & (uint64_t)0xff00000000000000ULL) >> 56) )); \
})
#endif /* !CONFIG_BYTESWAP_H */
static inline uint16_t bswap16(uint16_t x) static inline uint16_t bswap16(uint16_t x)
{ {
@ -64,7 +27,32 @@ static inline uint64_t bswap64(uint64_t x)
{ {
return bswap_64(x); return bswap_64(x);
} }
# else
static inline uint16_t bswap16(uint16_t x)
{
return (((x & 0x00ff) << 8) |
((x & 0xff00) >> 8));
}
static inline uint32_t bswap32(uint32_t x)
{
return (((x & 0x000000ffU) << 24) |
((x & 0x0000ff00U) << 8) |
((x & 0x00ff0000U) >> 8) |
((x & 0xff000000U) >> 24));
}
static inline uint64_t bswap64(uint64_t x)
{
return (((x & 0x00000000000000ffULL) << 56) |
((x & 0x000000000000ff00ULL) << 40) |
((x & 0x0000000000ff0000ULL) << 24) |
((x & 0x00000000ff000000ULL) << 8) |
((x & 0x000000ff00000000ULL) >> 8) |
((x & 0x0000ff0000000000ULL) >> 24) |
((x & 0x00ff000000000000ULL) >> 40) |
((x & 0xff00000000000000ULL) >> 56));
}
#endif /* ! CONFIG_MACHINE_BSWAP_H */ #endif /* ! CONFIG_MACHINE_BSWAP_H */
static inline void bswap16s(uint16_t *s) static inline void bswap16s(uint16_t *s)