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Try to connect the AVX2 backend to the ExtendedPoint frontend

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Henry de Valence 2017-11-20 15:27:44 -08:00
parent 77766b3422
commit 97fe2f0bf4
3 changed files with 40 additions and 29 deletions
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1
build.rs
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@ -1,4 +1,5 @@
#![cfg_attr(feature = "nightly", feature(i128_type))] #![cfg_attr(feature = "nightly", feature(i128_type))]
#![cfg_attr(feature = "nightly", feature(cfg_target_feature))]
#![allow(unused_variables)] #![allow(unused_variables)]
#![allow(non_snake_case)] #![allow(non_snake_case)]
#![allow(dead_code)] #![allow(dead_code)]

9
src/edwards.rs
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@ -432,6 +432,14 @@ impl<'a, 'b> Mul<&'b Scalar> for &'a ExtendedPoint {
/// For scalar multiplication of a basepoint, /// For scalar multiplication of a basepoint,
/// `EdwardsBasepointTable` is approximately 4x faster. /// `EdwardsBasepointTable` is approximately 4x faster.
fn mul(self, scalar: &'b Scalar) -> ExtendedPoint { fn mul(self, scalar: &'b Scalar) -> ExtendedPoint {
// If we built with AVX2, use the AVX2 backend.
#[cfg(all(target_feature = "avx2", feature = "avx2_backend"))] {
use backend::avx2::edwards as edwards_avx2;
let P_avx2 = edwards_avx2::ExtendedPoint::from(*self);
return ExtendedPoint::from(&P_avx2 * scalar);
}
// Otherwise, proceed as normal:
#[cfg(not(all(target_feature = "avx2", feature = "avx2_backend")))] {
// Construct a lookup table of [P,2P,3P,4P,5P,6P,7P,8P] // Construct a lookup table of [P,2P,3P,4P,5P,6P,7P,8P]
let P = self.to_projective_niels(); let P = self.to_projective_niels();
let mut lookup_table: [ProjectiveNielsPoint; 8] = [P; 8]; let mut lookup_table: [ProjectiveNielsPoint; 8] = [P; 8];
@ -466,6 +474,7 @@ impl<'a, 'b> Mul<&'b Scalar> for &'a ExtendedPoint {
Q Q
} }
} }
}
impl<'a, 'b> Mul<&'b ExtendedPoint> for &'a Scalar { impl<'a, 'b> Mul<&'b ExtendedPoint> for &'a Scalar {
type Output = ExtendedPoint; type Output = ExtendedPoint;

3
src/lib.rs
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@ -11,11 +11,12 @@
#![cfg_attr(not(feature = "std"), no_std)] #![cfg_attr(not(feature = "std"), no_std)]
#![cfg_attr(feature = "alloc", feature(alloc))] #![cfg_attr(feature = "alloc", feature(alloc))]
#![cfg_attr(feature = "nightly", feature(i128_type))] #![cfg_attr(feature = "nightly", feature(i128_type))]
#![cfg_attr(feature = "nightly", feature(cfg_target_feature))]
#![cfg_attr(feature = "bench", feature(test))] #![cfg_attr(feature = "bench", feature(test))]
#![cfg_attr(all(feature = "nightly", feature = "std"), feature(zero_one))] #![cfg_attr(all(feature = "nightly", feature = "std"), feature(zero_one))]
#![allow(unused_features)] #![allow(unused_features)]
//#![deny(missing_docs)] // refuse to compile if documentation is missing #![deny(missing_docs)] // refuse to compile if documentation is missing
//! # curve25519-dalek //! # curve25519-dalek
//! //!