Function sapling_crypto_ce::circuit::float_point::parse_with_exponent_le

pub fn parse_with_exponent_le<E: Engine, CS: ConstraintSystem<E>>(
    cs: CS, 
    bits: &[Boolean], 
    exponent_length: usize, 
    mantissa_length: usize, 
    exponent_base: u64
) -> Result<AllocatedNum<E>, SynthesisError>

Takes a bit decomposition, parses and packs into an AllocatedNum If exponent is equal to zero, then exponent multiplier is equal to 1