From fa461b352bd49519e7c4e4c3f5038a7c3cbd3593 Mon Sep 17 00:00:00 2001
From: kinrezc <matt.czernik@gmail.com>
Date: Thu, 25 Jul 2024 16:49:22 -0400
Subject: [PATCH] use optimized abs

---
 src/lib/RmmLib.sol | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/src/lib/RmmLib.sol b/src/lib/RmmLib.sol
index 560d8f1..9c79200 100644
--- a/src/lib/RmmLib.sol
+++ b/src/lib/RmmLib.sol
@@ -284,7 +284,7 @@ function findRootNewX(bytes memory args, uint256 initialGuess, uint256 maxIterat
 
         reserveX_next = int256(reserveX_) - fx * 1e18 / dfx;
 
-        if (abs(int256(reserveX_) - reserveX_next) <= int256(tolerance) || abs(fx) <= int256(tolerance)) {
+        if (FixedPointMathLib.abs(int256(reserveX_) - reserveX_next) <= tolerance || FixedPointMathLib.abs(fx) <= tolerance) {
             reserveX_ = uint256(reserveX_next);
             break;
         }
@@ -310,7 +310,7 @@ function findRootNewY(bytes memory args, uint256 initialGuess, uint256 maxIterat
 
         reserveY_next = int256(reserveY_) - fx * 1e18 / dfx;
 
-        if (abs(int256(reserveY_) - reserveY_next) <= int256(tolerance) || abs(fx) <= int256(tolerance)) {
+        if (FixedPointMathLib.abs(int256(reserveY_) - reserveY_next) <= tolerance || FixedPointMathLib.abs(fx) <= tolerance) {
             reserveY_ = uint256(reserveY_next);
             break;
         }
@@ -479,14 +479,6 @@ function toUint(int256 x) pure returns (uint256) {
     return uint256(x);
 }
 
-function abs(int256 x) pure returns (int256) {
-    if (x < 0) {
-        return -x;
-    } else {
-        return x;
-    }
-}
-
 /// @dev Computes the scalar to multiply to convert between WAD and native units.
 function scalar(address token) view returns (uint256) {
     uint256 decimals = ERC20(token).decimals();