From 0fa45041cc722e6728ea318e4b7569021e0e0b81 Mon Sep 17 00:00:00 2001
From: xkx <xiakunxian130@gmail.com>
Date: Tue, 29 Aug 2023 21:13:54 +0800
Subject: [PATCH] fix: pairing cost formula  (#659)

* fix pairing cost formula bug

* chore: fmt

---------

Co-authored-by: Rohit Narurkar <rohit.narurkar@protonmail.com>
---
 crates/precompile/src/bn128.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/crates/precompile/src/bn128.rs b/crates/precompile/src/bn128.rs
index 70be85bf00..8d82a01db7 100644
--- a/crates/precompile/src/bn128.rs
+++ b/crates/precompile/src/bn128.rs
@@ -165,8 +165,7 @@ fn run_pair(
     pair_base_cost: u64,
     gas_limit: u64,
 ) -> PrecompileResult {
-    let gas_used =
-        pair_per_point_cost * input.len() as u64 / PAIR_ELEMENT_LEN as u64 + pair_base_cost;
+    let gas_used = (input.len() / PAIR_ELEMENT_LEN) as u64 * pair_per_point_cost + pair_base_cost;
     if gas_used > gas_limit {
         return Err(Error::OutOfGas);
     }