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williame/gist:3fcfeb1d424f01b2fa59

Created June 13, 2014 07:43
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iterating over the set bits in an int efficiently
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gistfile1.cpp
for(uint32_t m = mask, i = ~0U; m; ) {
auto shift = __builtin_ffs(m);
m >>= shift;
i += shift;
... do something with i
}
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