From 41f78b9925c2e5766b2cd58e457f0e2f446eb266 Mon Sep 17 00:00:00 2001
From: HaoranYi <haoran.yi@gmail.com>
Date: Wed, 2 Mar 2022 09:11:12 -0600
Subject: [PATCH] small optimization. use shift for pow of 2. (#22975)

---
 core/src/progress_map.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/progress_map.rs b/core/src/progress_map.rs
index c127d8c3d6..6e757102fa 100644
--- a/core/src/progress_map.rs
+++ b/core/src/progress_map.rs
@@ -339,7 +339,7 @@ pub struct RetransmitInfo {
 impl RetransmitInfo {
     pub fn reached_retransmit_threshold(&self) -> bool {
         let backoff = std::cmp::min(self.retry_iteration, RETRANSMIT_BACKOFF_CAP);
-        let backoff_duration_ms = 2_u64.pow(backoff) * RETRANSMIT_BASE_DELAY_MS;
+        let backoff_duration_ms = (1_u64 << backoff) * RETRANSMIT_BASE_DELAY_MS;
         self.retry_time
             .map(|time| time.elapsed().as_millis() > backoff_duration_ms.into())
             .unwrap_or(true)