ilog()

static int32_t fl::third_party::vorbis::ilog ( int32 n )

static

Definition at line 761 of file stb_vorbis.cpp.hpp.

{
   static signed char log2_4[16] = { 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4 };
 
   if (n < 0) return 0; // signed n returns 0
 
   // 2 compares if n < 16, 3 compares otherwise (4 if signed or n > 1<<29)
   if (n < (1 << 14))
        if (n < (1 <<  4))            return  0 + log2_4[n      ];
        else if (n < (1 <<  9))       return  5 + log2_4[n >>  5];
             else                     return 10 + log2_4[n >> 10];
   else if (n < (1L << 24))
             if (n < (1L << 19))       return 15 + log2_4[n >> 15];
             else                     return 20 + log2_4[n >> 20];
        else if (n < (1L << 29))       return 25 + log2_4[n >> 25];
             else                     return 30 + log2_4[n >> 30];
}

References fl::FL_NO_EXCEPT.

Referenced by compute_bitreverse(), inverse_mdct(), peek_decode_initial(), start_decoder(), vorbis_decode_initial(), and vorbis_decode_packet_rest().

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