From 1bfd5ce214c11d3d50440dd425d58925c38d4d71 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maciej=20Zwoli=C5=84ski?= <mac.zwolinski@gmail.com>
Date: Tue, 25 Oct 2022 22:05:06 +0200
Subject: [PATCH] perf: optimize console PoseidonSponge::apply_s_box

Signed-off-by: Maciej Zwolinski <mac.zwolinski@gmail.com>
---
 console/algorithms/src/poseidon/helpers/sponge.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/console/algorithms/src/poseidon/helpers/sponge.rs b/console/algorithms/src/poseidon/helpers/sponge.rs
index 6401bc1df3..b87007a42e 100644
--- a/console/algorithms/src/poseidon/helpers/sponge.rs
+++ b/console/algorithms/src/poseidon/helpers/sponge.rs
@@ -111,14 +111,15 @@ impl<E: Environment, const RATE: usize, const CAPACITY: usize> PoseidonSponge<E,
     #[inline]
     fn apply_s_box(&mut self, is_full_round: bool) {
         // Full rounds apply the S Box (x^alpha) to every element of state
+        let alpha = Field::from_u64(self.parameters.alpha);
         if is_full_round {
             for elem in self.state.iter_mut() {
-                *elem = elem.pow(Field::from_u64(self.parameters.alpha));
+                *elem = elem.pow(alpha);
             }
         }
         // Partial rounds apply the S Box (x^alpha) to just the first element of state
         else {
-            self.state[0] = self.state[0].pow(Field::from_u64(self.parameters.alpha));
+            self.state[0] = self.state[0].pow(alpha);
         }
     }