| Copyright | (c) 2020 Andrew Lelechenko (c) 2020 Composewell Technologies |
|---|---|
| License | BSD-3-Clause |
| Maintainer | streamly@composewell.com |
| Stability | experimental |
| Portability | GHC |
| Safe Haskell | None |
| Language | Haskell2010 |
Unicode.Internal.Bits
Description
Fast, static bitmap lookup utilities
Synopsis
- lookupBit64 :: Addr# -> Int -> Bool
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.