noporpoise / bitarray Goto Github PK
View Code? Open in Web Editor NEWC bit array structs and methods
License: Creative Commons Zero v1.0 Universal
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diegocaro thaingo longcongduoi cs0x7f duhovny goshng ckiick fromeroj kdm9 zhan1997 chuandadexiaoyu jackiexie168 greenoaktree h0dgep0dge agelin iqbal-lab iba-1 wasade mindis living1069 patchu shangdawei aaryan6789 sspeng skyvostro realwindz superoptimo ivandart vtppplusgo edawson billybones256 maohaibo junior-2016 nikhil400 erisonliang asc2011 systbs suchcoders binrick why520it maxbalk yulisticbitarray's Issues
Tag a new release
Any chance you can tag a new release? Been 57 commits since 2013.
Fails on big-endian processor (microblaze)
If I add 8 bytes to a bit array:
55 31 5A 12 02 31 C3 1E
And then print the bit array's words[0] with printf( "%016" PRIx64"", val ):
1ec33102125a3155
And then I loop through the bits with:
for ( int idx = 0; idx < 64; idx++ )
{
if ( bit_array_get_bit( ba, idx ) == 0 )
printf( "0" );
else
printf( "1" );
}
then I get (I added spaces to make it easier to see):
10101010 10001100 01011010 01001000 01000000 10001100 11000011 01111000
Which is wrong for a big-endian processor. It should be:
01010101 00110001 01011010 00010010 00000010 00110001 11000011 00011110
You can see that the order of the bits within each byte is backwards. You're assuming little-endian ordering.
Add bit_array_find_next_set_bit()
Add bit_array_find_next_set_bit(), a generalised version of bit_array_find_first_set_bit().
Comparing with std::bitset
Need a comparison with std::bitset, so it's more attractive
issue line 170 in bit_array.c
Hi,
It seems that there is an issue in the function
static word_t __inline windows_popcount(word_t w)
{
w = w - ((w >> 1) & (word_t)~(word_t)0/3);
w = (w & (word_t)~(word_t)0/15_3) + ((w >> 2) & (word_t)~(word_t)0/15_3);
w = (w + (w >> 4)) & (word_t)~(word_t)0/255*15;
c = (word_t)(w \* ((word_t)~(word_t)0/255)) >> (sizeof(word_t) - 1) \* 8;
}
line 170 in bit_array.c
Best Regards,
Long Yuan
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