From 4520afef3e7afdcfedd994586cbb77d62e307c68 Mon Sep 17 00:00:00 2001
From: zhiqiangxu <652732310@qq.com>
Date: Tue, 29 Aug 2023 00:03:29 +0800
Subject: [PATCH] avoid realloc

---
 halo2_proofs/src/plonk/permutation/keygen.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/halo2_proofs/src/plonk/permutation/keygen.rs b/halo2_proofs/src/plonk/permutation/keygen.rs
index 95bcb2a1..e328ed57 100644
--- a/halo2_proofs/src/plonk/permutation/keygen.rs
+++ b/halo2_proofs/src/plonk/permutation/keygen.rs
@@ -132,7 +132,7 @@ impl Assembly {
         }
 
         // Pre-compute commitments for the URS.
-        let mut commitments = vec![];
+        let mut commitments = Vec::with_capacity(p.columns.len());
         for i in 0..p.columns.len() {
             // Computes the permutation polynomial based on the permutation
             // description in the assembly.