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Use repeated_frobenius in ExtensionTarget::frobenius.

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This commit is contained in:
wborgeaud 2021-06-15 17:34:37 +02:00
parent b44a01c975
commit 89c6a6b4e6
1 changed files with 1 additions and 12 deletions
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13
src/field/extension_field/target.rs
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@ -18,18 +18,7 @@ impl<const D: usize> ExtensionTarget<D> {
} }
pub fn frobenius<F: Extendable<D>>(&self, builder: &mut CircuitBuilder<F, D>) -> Self { pub fn frobenius<F: Extendable<D>>(&self, builder: &mut CircuitBuilder<F, D>) -> Self {
let arr = self.to_target_array(); self.repeated_frobenius(1, builder)
let k = (F::ORDER - 1) / (D as u64);
let zs = (0..D as u64)
.map(|i| builder.constant(F::Extension::W.exp(k * i)))
.collect::<Vec<_>>();
let mut res = Vec::with_capacity(D);
for (z, a) in zs.into_iter().zip(arr) {
res.push(builder.mul(z, a));
}
res.try_into().unwrap()
} }
pub fn repeated_frobenius<F: Extendable<D>>( pub fn repeated_frobenius<F: Extendable<D>>(