From 5f0e5855d04eda6a00e2ff7a9362154623da8c9c Mon Sep 17 00:00:00 2001
From: WangXi <xib1102@icloud.com>
Date: Sat, 21 Nov 2020 01:15:52 +0800
Subject: [PATCH] perf: use better FxHash instead of aHash to speed up circuit
 computation

---
 Cargo.toml | 2 +-
 src/lib.rs | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 45ad5023c..177a325bb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ rand = "0.7"
 rayon = "1.3.0"
 memmap = "0.7.0"
 thiserror = "1.0.10"
-ahash = "0.5.6"
+rustc-hash = "1.1.0"
 num_cpus = "1"
 crossbeam-channel = "0.5.0"
 
diff --git a/src/lib.rs b/src/lib.rs
index 7370efec3..713b42c9a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -151,7 +151,7 @@ pub mod multiexp;
 pub mod util_cs;
 use ff::{Field, ScalarEngine};
 
-use ahash::AHashMap as HashMap;
+use rustc_hash::FxHashMap as HashMap;
 use std::io;
 use std::marker::PhantomData;
 use std::ops::{Add, Sub};
@@ -205,7 +205,7 @@ impl<E: ScalarEngine> Default for LinearCombination<E> {
 
 impl<E: ScalarEngine> LinearCombination<E> {
     pub fn zero() -> LinearCombination<E> {
-        LinearCombination(HashMap::new())
+        LinearCombination(HashMap::default())
     }
 
     pub fn iter(&self) -> impl Iterator<Item = (&Variable, &E::Fr)> + '_ {