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mysys/my_bit.h
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    Comments shows how this works with 01100000000000000000000000001011
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*/
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static inline uint32 my_round_up_to_next_power(uint32 v)
 
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static inline uint32_t my_round_up_to_next_power(uint32_t v)
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{
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  v--;                  /* 01100000000000000000000000001010 */
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  v|= v >> 1;           /* 01110000000000000000000000001111 */
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  return v+1;           /* 10000000000000000000000000000000 */
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}
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static inline uint32 my_clear_highest_bit(uint32 v)
 
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static inline uint32_t my_clear_highest_bit(uint32_t v)
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{
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  uint32 w=v >> 1;
 
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  uint32_t w=v >> 1;
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  w|= w >> 1;
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  w|= w >> 2;
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  w|= w >> 4;
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  return v & w;
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}
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static inline uint32 my_reverse_bits(uint32 key)
 
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static inline uint32_t my_reverse_bits(uint32_t key)
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{
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  return
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    (_my_bits_reverse_table[ key      & 255] << 24) |