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terriberry
2013 Sep 06
4
About de Bruijn sequences in bitmath.h
Found this code: ftp://ftp.samba.org/pub/unpacked/ntdb/lib/ccan/ilog/ilog.c
Tests show that it's faster to use the following code in FLAC__bitmath_ilog2_wide():
static const unsigned char DEBRUIJN_IDX32[32]={
0, 1,28, 2,29,14,24, 3,30,22,20,15,25,17, 4, 8,
31,27,13,23,21,19,16, 7,26,12,18, 6,11, 5,10, 9
};
FLAC__uint32 v;
int m;