From ad5c3cb2684bff19a696a958aa3d7194c8ab47b8 Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Date: Wed, 24 Jan 2024 22:12:23 -0400
Subject: [PATCH] OpcodeDispatcher: rmif mask for OF in rcr smaller

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
---
 FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp b/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
index 3b759bf16..14b414c8e 100644
--- a/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
+++ b/FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp
@@ -2612,8 +2612,8 @@ void OpDispatchBuilder::RCRSmallerOp(OpcodeArgs) {
     // OF is the top two MSBs XOR'd together
     // Only when Shift == 1, it is undefined otherwise
     if (!IsSrcConst || SrcConst == 1) {
-      auto NewOF = _Xor(IR::SizeToOpSize(std::max<uint8_t>(4u, GetOpSize(Res))), _Bfe(OpSize::i64Bit, 1, Size - 1, Res), _Bfe(OpSize::i64Bit, 1, Size - 2, Res));
-      SetRFLAG<FEXCore::X86State::RFLAG_OF_RAW_LOC>(NewOF);
+      auto NewOF = _XorShift(IR::SizeToOpSize(std::max<uint8_t>(4u, GetOpSize(Res))), Res, Res, ShiftType::LSR, 1);
+      SetRFLAG<FEXCore::X86State::RFLAG_OF_RAW_LOC>(NewOF, Size - 2, true);
     }
   });
 }