From 3eb8c0d79b81b581aa0a2ed51ce295559848bea6 Mon Sep 17 00:00:00 2001
From: SimoneN64 <simococo03@gmail.com>
Date: Fri, 21 Jun 2024 22:39:11 +0200
Subject: [PATCH] pretty huge mtc1/dmtc1 bug

---
 src/backend/core/registers/cop/cop1instructions.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/backend/core/registers/cop/cop1instructions.cpp b/src/backend/core/registers/cop/cop1instructions.cpp
index 45d2f2f2..5a4eece5 100644
--- a/src/backend/core/registers/cop/cop1instructions.cpp
+++ b/src/backend/core/registers/cop/cop1instructions.cpp
@@ -1078,7 +1078,7 @@ void Cop1::sdc1Interp(Mem& mem, u32 instr) {
 
 void Cop1::mfc1(u32 instr) {
   CheckFPUUsable_PreserveCause();
-  regs.gpr[RT(instr)] = FGR_S<s32>(regs.cop0.status, FS(instr));
+  regs.gpr[RT(instr)] = FGR_T<s32>(regs.cop0.status, FS(instr));
 }
 
 void Cop1::dmfc1(u32 instr) {
@@ -1088,7 +1088,7 @@ void Cop1::dmfc1(u32 instr) {
 
 void Cop1::mtc1(u32 instr) {
   CheckFPUUsable_PreserveCause();
-  FGR_S<u32>(regs.cop0.status, FS(instr)) = regs.gpr[RT(instr)];
+  FGR_T<s32>(regs.cop0.status, FS(instr)) = regs.gpr[RT(instr)];
 }
 
 void Cop1::dmtc1(u32 instr) {