From 4a6ddf1c2684892178ca0acc7b412d207672be7c Mon Sep 17 00:00:00 2001
From: AnthonyMikh <anthony.mikh@yandex.ru>
Date: Mon, 26 Oct 2020 19:03:43 +0300
Subject: [PATCH] Avoid bounds checking in loop

Slicing `src` checks bounds only once instead of on every iteration of loop.
---
 src/gf2.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/gf2.rs b/src/gf2.rs
index 7d14d61..92369a0 100644
--- a/src/gf2.rs
+++ b/src/gf2.rs
@@ -1,6 +1,7 @@
 pub fn add_assign_binary(dest: &mut [u64], src: &[u64]) {
-    for i in 0..dest.len() {
+    let len = dest.len();
+    for (dest, &src) in dest.iter_mut().zip(&src[..len]) {
         // Addition over GF(2) is defined as XOR
-        dest[i] ^= src[i];
+        *dest ^= src;
     }
 }