From 8241e9735a4e1269a15cdc9006acc3d00955d08d Mon Sep 17 00:00:00 2001
From: iris <iris.kaizen@pm.me>
Date: Tue, 31 Mar 2026 11:42:24 +0200
Subject: [PATCH] Fix exception for "unusable COP1" in 4 instructions i missed
 accidentally

---
 src/backend/core/interpreter/decode.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/backend/core/interpreter/decode.cpp b/src/backend/core/interpreter/decode.cpp
index b131f97..4ebe67f 100644
--- a/src/backend/core/interpreter/decode.cpp
+++ b/src/backend/core/interpreter/decode.cpp
@@ -414,12 +414,16 @@ void Interpreter::Exec(const Instruction instr) {
     ll(instr);
     break;
   case Instruction::LWC1:
+    if (!regs.cop1.CheckFPUUsable())
+      return;
     regs.cop1.lwc1(instr);
     break;
   case Instruction::LLD:
     lld(instr);
     break;
   case Instruction::LDC1:
+    if (!regs.cop1.CheckFPUUsable())
+      return;
     regs.cop1.ldc1(instr);
     break;
   case Instruction::LD:
@@ -429,12 +433,16 @@ void Interpreter::Exec(const Instruction instr) {
     sc(instr);
     break;
   case Instruction::SWC1:
+    if (!regs.cop1.CheckFPUUsable())
+      return;
     regs.cop1.swc1(instr);
     break;
   case Instruction::SCD:
     scd(instr);
     break;
   case Instruction::SDC1:
+    if (!regs.cop1.CheckFPUUsable())
+      return;
     regs.cop1.sdc1(instr);
     break;
   case Instruction::SD: