From 94b85b08064d073f8b631cb6685224b3af93e5ea Mon Sep 17 00:00:00 2001
From: Daniel Lubarov <daniel@lubarov.com>
Date: Fri, 30 Jul 2021 09:03:23 -0700
Subject: [PATCH] Small optimization -- use mul_add instead of mul + add (#137)

---
 src/plonk/plonk_common.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/plonk/plonk_common.rs b/src/plonk/plonk_common.rs
index e31825ad..fb083764 100644
--- a/src/plonk/plonk_common.rs
+++ b/src/plonk/plonk_common.rs
@@ -183,8 +183,7 @@ pub(crate) fn reduce_with_powers_ext_recursive<F: Extendable<D>, const D: usize>
 ) -> ExtensionTarget<D> {
     let mut sum = builder.zero_extension();
     for &term in terms.iter().rev() {
-        sum = builder.scalar_mul_ext(alpha, sum);
-        sum = builder.add_extension(sum, term);
+        sum = builder.scalar_mul_add_extension(alpha, sum, term);
     }
     sum
 }