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@@ -45,4 +45,31 @@ static inline unsigned long __fswab32(unsigned long x)
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___swab32((x)) : \
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___swab32((x)) : \
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__fswab32((x)))
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__fswab32((x)))
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+#if defined __GNUC__ && __GNUC__ >= 2
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+/* Swap bytes in 64 bit value. */
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+# define __bswap_constant_64(x) \
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+ ((((x) & 0xff00000000000000ull) >> 56) \
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+ | (((x) & 0x00ff000000000000ull) >> 40) \
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+ | (((x) & 0x0000ff0000000000ull) >> 24) \
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+ | (((x) & 0x000000ff00000000ull) >> 8) \
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+ | (((x) & 0x00000000ff000000ull) << 8) \
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+ | (((x) & 0x0000000000ff0000ull) << 24) \
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+ | (((x) & 0x000000000000ff00ull) << 40) \
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+ | (((x) & 0x00000000000000ffull) << 56))
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+
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+# define __bswap_64(x) \
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+ (__extension__ \
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+ ({ union { __extension__ unsigned long long int __ll; \
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+ unsigned int __l[2]; } __w, __r; \
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+ if (__builtin_constant_p (x)) \
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+ __r.__ll = __bswap_constant_64 (x); \
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+ else \
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+ { \
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+ __w.__ll = (x); \
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+ __r.__l[0] = __bswap_32 (__w.__l[1]); \
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+ __r.__l[1] = __bswap_32 (__w.__l[0]); \
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+ } \
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+ __r.__ll; }))
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+#endif
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+
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#endif /* _BITS_BYTESWAP_H */
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#endif /* _BITS_BYTESWAP_H */
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