Fast, static bitmap lookup utilities
Documentation
lookupBit64 :: Addr# -> Int -> Bool Source #
lookup64 addr index
looks up the bit stored at bit index index
using a
bitmap starting at the address addr
. Looks up the 64-bit word containing
the bit and then the bit in that word. The caller must make sure that the
64-bit word at the byte address (addr + index / 64) * 8 is legally
accessible memory.