Function forest_filecoin::blocks::election_proof::expneg

fn expneg(x: &BigInt) -> BigInt

expneg accepts x in Q.256 format and computes e^-x. It is most precise within [0, 1.725) range, where error is less than 3.4e-30. Over the [0, 5) range its error is less than 4.6e-15. Output is in Q.256 format.