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Add optimized version of the bswap macroes for constants if __OPTIMIZED__ is

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defined.
This commit is contained in:
Olivier Houchard 2004-10-01 16:55:59 +00:00
parent d60ea0a816
commit 74e9b5ed3b
1 changed files with 30 additions and 2 deletions
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32
sys/arm/include/endian.h
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@ -70,7 +70,7 @@ __bswap64(__uint64_t _x)
}
static __inline __uint32_t
__bswap32(__uint32_t v)
__bswap32_var(__uint32_t v)
{
__uint32_t t1;
@ -83,7 +83,7 @@ __bswap32(__uint32_t v)
}
static __inline __uint16_t
__bswap16(__uint32_t v)
__bswap16_var(__uint32_t v)
{
__asm __volatile(
"mov %0, %1, ror #8\n"
@ -94,4 +94,32 @@ __bswap16(__uint32_t v)
return (v);
}
#ifdef __OPTIMIZE__
#define __bswap32_constant(x) \
((((x) & 0xff000000U) >> 24) | \
(((x) & 0x00ff0000U) >> 8) | \
(((x) & 0x0000ff00U) << 8) | \
(((x) & 0x000000ffU) << 24))
#define __bswap16_constant(x) \
((((x) & 0xff00) >> 8) | \
(((x) & 0x00ff) << 8))
#define __bswap16(x) \
(__builtin_constant_p(x) ? \
__bswap16_constant(x) : \
__bswap16_var(x))
#define __bswap32(x) \
(__builtin_constant_p(x) ? \
__bswap32_constant(x) : \
__bswap32_var(x))
#else
#define __bswap16(x) __bswap16_var(x)
#define __bswap32(x) __bswap32_var(x)
#endif /* __OPTIMIZE__ */
#endif /* !_ENDIAN_H_ */