Function decaf377::fields::fr::u32::fiat::fr_opp

pub fn fr_opp(
    out1: &mut FrMontgomeryDomainFieldElement,
    arg1: &FrMontgomeryDomainFieldElement,
)

The function fr_opp negates a field element in the Montgomery domain.

Preconditions: 0 ≤ eval arg1 < m Postconditions: eval (from_montgomery out1) mod m = -eval (from_montgomery arg1) mod m 0 ≤ eval out1 < m