Address compilation failure on aarch64, in parallel mode

Signed-off-by: Anjan Roy <hello@itzmeanjan.in>

Author: itzmeanjan

src/full/encoder.rs

@@ -2,12 +2,11 @@ use super::consts::BOUNDARY_MARKER;
 use crate::RLNCError;
 use rand::Rng;
 
-#[cfg(not(feature = "parallel"))]
-use crate::common::simd::gf256_mul_vec_by_scalar_then_add_into_vec;
-
 #[cfg(all(feature = "parallel", not(any(target_arch = "x86", target_arch = "x86_64"))))]
 use crate::common::gf256::Gf256;
-#[cfg(feature = "parallel")]
+#[cfg(not(feature = "parallel"))]
+use crate::common::simd::gf256_mul_vec_by_scalar_then_add_into_vec;
+#[cfg(all(feature = "parallel", any(target_arch = "x86", target_arch = "x86_64")))]
 use crate::common::simd::{gf256_inplace_add_vectors, gf256_inplace_mul_vec_by_scalar};
 #[cfg(feature = "parallel")]
 use rayon::prelude::*;
@@ -165,14 +164,28 @@ impl Encoder {
             .fold(
                 || vec![0u8; self.piece_byte_len],
                 |mut acc, cur| {
+                    #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
                     gf256_inplace_add_vectors(&mut acc, &cur);
+
+                    #[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))]
+                    acc.iter_mut().zip(cur).for_each(|(a, b)| {
+                        *a ^= b;
+                    });
+
                     acc
                 },
             )
             .reduce(
                 || vec![0u8; self.piece_byte_len],
                 |mut acc, cur| {
+                    #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
                     gf256_inplace_add_vectors(&mut acc, &cur);
+
+                    #[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))]
+                    acc.iter_mut().zip(cur).for_each(|(a, b)| {
+                        *a ^= b;
+                    });
+
                     acc
                 },
             );