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I’m looking for a c++ class/library that provides 1024 bit and bigger integers and bit operations like:
– bit shifting,
– bitwise OR/AND,
– position first zero bit
speed is crucial, so it would have to be implemented with some SIMD assembly.
There are several, including GMP, but for speed, the best is likely TTmath. TTmath’s design decision to use templated fixed lengths at compiletime lets it be quite fast.