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翻转64 32 16 位

2016-07-04 15:35 302 查看

#define Reverse64(val)   ((std::uint64_t) ( \

      (((std::uint64_t) (val) &                       \

   (std::uint64_t) (0x00000000000000ffU)) << 56) |   \

      (((std::uint64_t) (val) &                   \

   (std::uint64_t) (0x000000000000ff00U)) << 40) |   \

      (((std::uint64_t) (val) &                   \

   (std::uint64_t) (0x0000000000ff0000U)) << 24) |   \

      (((std::uint64_t) (val) &                   \

   (std::uint64_t) (0x00000000ff000000U)) << 8) |   \

      (((std::uint64_t) (val) &                   \

   (std::uint64_t) (0x000000ff00000000U)) >> 8) |   \

      (((std::uint64_t) (val) &                   \

   (std::uint64_t) (0x0000ff0000000000U)) >> 24) |   \

      (((std::uint64_t) (val) &                   \

   (std::uint64_t) (0x00ff000000000000U)) >> 40) |   \

      (((std::uint64_t) (val) &                   \

   (std::uint64_t) (0xff00000000000000U)) >> 56)))

#define Reverse32(val)   ((std::uint32_t) ( \

(((std::uint64_t) (val) &                   \

(std::uint32_t) (0x000000ffU)) << 24) | \

(((std::uint32_t) (val) &                   \

(std::uint32_t) (0x0000ff00U)) << 8) | \

(((std::uint32_t) (val) &                   \

(std::uint32_t) (0x00ff0000U)) >> 8) | \

(((std::uint32_t) (val) &                   \

(std::uint32_t) (0xff000000U)) >> 24)))

#define Reverse16(val)   ((std::uint16_t) ( \

(((std::uint16_t) (val) &                   \

(std::uint16_t) (0x00ffU)) << 8) | \

(((std::uint16_t) (val) &                   \

(std::uint16_t) (0xff00U)) >> 8)))

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