From 157b10001594b1ba41296df2a7f1c2df1eb62b6f Mon Sep 17 00:00:00 2001
From: 0xtotem <104422021+0xtotem@users.noreply.github.com>
Date: Sat, 14 Jan 2023 09:48:57 +0100
Subject: [PATCH] Reduces mul execution cost

Reduces from 21769 down to 21748 when a != 0
---
 contracts/libraries/math/SafeMath.sol | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/contracts/libraries/math/SafeMath.sol b/contracts/libraries/math/SafeMath.sol
index 7cb3abaa..474bfba8 100644
--- a/contracts/libraries/math/SafeMath.sol
+++ b/contracts/libraries/math/SafeMath.sol
@@ -75,15 +75,8 @@ library SafeMath {
      * - Multiplication cannot overflow.
      */
     function mul(uint256 a, uint256 b) internal pure returns (uint256) {
-        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
-        // benefit is lost if 'b' is also tested.
-        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
-        if (a == 0) {
-            return 0;
-        }
-
         uint256 c = a * b;
-        require(c / a == b, "SafeMath: multiplication overflow");
+        require(a == 0 || c / a == b, "SafeMath: multiplication overflow");
 
         return c;
     }