From 582bc41a0bb7fb02a1a68717fdf83c6fe432d422 Mon Sep 17 00:00:00 2001
From: Francisco Krause Arnim <56402156+fkrause98@users.noreply.github.com>
Date: Fri, 29 Sep 2023 18:23:18 -0300
Subject: [PATCH] Update precompiles/Modexp.yul

Co-authored-by: Ivan Litteri <67517699+ilitteri@users.noreply.github.com>
---
 precompiles/Modexp.yul | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/precompiles/Modexp.yul b/precompiles/Modexp.yul
index ab263fa7..ab6b8b47 100644
--- a/precompiles/Modexp.yul
+++ b/precompiles/Modexp.yul
@@ -369,15 +369,14 @@ object "ModExp" {
                 let ithLimbBorrowResult
                 let ithLimbSubtractionResult
                 let borrow := 0
-                let limbOffset := 0
+                let limbOffset := shl(5, numberOfLimbs)
                 for {let i := numberOfLimbs} gt(i, 0) {i := sub(i, 1)} {
-                    limbOffset := mul(sub(i,1), 32)
                     leftIthLimbValue := getLimbValueAtOffset(lhsPointer, limbOffset)
                     rightIthLimbValue := getLimbValueAtOffset(rhsPointer, limbOffset)
                     ithLimbSubtractionResult, borrow :=
                                                subLimbsWithBorrow(leftIthLimbValue, rightIthLimbValue, borrow)
                     storeLimbValueAtOffset(resultPointer, limbOffset, ithLimbSubtractionResult)
-
+                    limbOffset := sub(limbOffset, LIMB_SIZE_IN_BYTES())
                 }
             }