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#define RSB(in)\
((in&0x00000001?0:\
(in&0x00000002?1:\
(in&0x00000004?2:\
(in&0x00000008?3:\
(in&0x00000010?4:\
(in&0x00000020?5:\
(in&0x00000040?6:\
(in&0x00000080?7:\
(in&0x00000100?8:\
(in&0x00000200?9:\
(in&0x00000400?10:\
(in&0x00000800?11:\
(in&0x00001000?12:\
(in&0x00002000?13:\
(in&0x00004000?14:\
(in&0x00008000?15:\
(in&0x00010000?16:\
(in&0x00020000?17:\
(in&0x00040000?18:\
(in&0x00080000?19:\
(in&0x00100000?20:\
(in&0x00200000?21:\
(in&0x00400000?22:\
(in&0x00800000?23:\
(in&0x01000000?24:\
(in&0x02000000?25:\
(in&0x04000000?26:\
(in&0x08000000?27:\
(in&0x10000000?28:\
(in&0x20000000?29:\
(in&0x40000000?30:\
(in&0x80000000?31:0)))))))))))))))))))))))))))))))))
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