From ae7a6367f4fd38a4be976933ce31f72e0550be4c Mon Sep 17 00:00:00 2001
From: predy-dev <predy-protocol@protonmail.com>
Date: Fri, 26 Nov 2021 12:12:16 +0900
Subject: [PATCH] audit related change. AML-02

---
 contracts/lib/AMMLib.sol | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/contracts/lib/AMMLib.sol b/contracts/lib/AMMLib.sol
index 4e57bcc..37232d7 100644
--- a/contracts/lib/AMMLib.sol
+++ b/contracts/lib/AMMLib.sol
@@ -154,6 +154,8 @@ library AMMLib {
         for (uint32 i = _tickStart; i < _tickEnd; i++) {
             Tick storage tick = _pool.ticks[i];
             if (tick.supply > 0) {
+                // We use roundUp here to make sure that the money going into the contract
+                // is always equal or greater than the money going out.
                 uint128 a = calSwapAmountForLPToken(tick, mintPerRange, true);
 
                 tick.balance += a;
@@ -1204,7 +1206,7 @@ library AMMLib {
                     IOptionVault.MarginLevel.Safe
                 );
 
-                availableSize = uint128(PredyMath.mulDiv(_c, 1e10, (pricePerAmount + 1e2 * safeMargin), true));
+                availableSize = (_c * 1e10) / (pricePerAmount + 1e2 * safeMargin);
             }
 
             uint128 ivMove = calIVMove(_pool, ivRange / availableSize, locked.ivMove, locked.tradeTime);